{"nl": {"description": "Vasya has got many devices that work on electricity. He's got n supply-line filters to plug the devices, the i-th supply-line filter has ai sockets.Overall Vasya has got m devices and k electrical sockets in his flat, he can plug the devices or supply-line filters directly. Of course, he can plug the supply-line filter to any other supply-line filter. The device (or the supply-line filter) is considered plugged to electricity if it is either plugged to one of k electrical sockets, or if it is plugged to some supply-line filter that is in turn plugged to electricity. What minimum number of supply-line filters from the given set will Vasya need to plug all the devices he has to electricity? Note that all devices and supply-line filters take one socket for plugging and that he can use one socket to plug either one device or one supply-line filter.", "input_spec": "The first line contains three integers n, m, k (1\u2009\u2264\u2009n,\u2009m,\u2009k\u2009\u2264\u200950) \u2014 the number of supply-line filters, the number of devices and the number of sockets that he can plug to directly, correspondingly. The second line contains n space-separated integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u200950) \u2014 number ai stands for the number of sockets on the i-th supply-line filter.", "output_spec": "Print a single number \u2014 the minimum number of supply-line filters that is needed to plug all the devices to electricity. If it is impossible to plug all the devices even using all the supply-line filters, print -1.", "sample_inputs": ["3 5 3\n3 1 2", "4 7 2\n3 3 2 4", "5 5 1\n1 3 1 2 1"], "sample_outputs": ["1", "2", "-1"], "notes": "NoteIn the first test case he can plug the first supply-line filter directly to electricity. After he plug it, he get 5 (3 on the supply-line filter and 2 remaining sockets for direct plugging) available sockets to plug. Thus, one filter is enough to plug 5 devices.One of the optimal ways in the second test sample is to plug the second supply-line filter directly and plug the fourth supply-line filter to one of the sockets in the second supply-line filter. Thus, he gets exactly 7 sockets, available to plug: one to plug to the electricity directly, 2 on the second supply-line filter, 4 on the fourth supply-line filter. There's no way he can plug 7 devices if he use one supply-line filter."}, "src_uid": "b32ab27503ee3c4196d6f0d0f133d13c"}
{"nl": {"description": "\u00abOne dragon. Two dragon. Three dragon\u00bb, \u2014 the princess was counting. She had trouble falling asleep, and she got bored of counting lambs when she was nine.However, just counting dragons was boring as well, so she entertained herself at best she could. Tonight she imagined that all dragons were here to steal her, and she was fighting them off. Every k-th dragon got punched in the face with a frying pan. Every l-th dragon got his tail shut into the balcony door. Every m-th dragon got his paws trampled with sharp heels. Finally, she threatened every n-th dragon to call her mom, and he withdrew in panic.How many imaginary dragons suffered moral or physical damage tonight, if the princess counted a total of d dragons?", "input_spec": "Input data contains integer numbers k,\u2009l,\u2009m,\u2009n and d, each number in a separate line (1\u2009\u2264\u2009k,\u2009l,\u2009m,\u2009n\u2009\u2264\u200910, 1\u2009\u2264\u2009d\u2009\u2264\u2009105).", "output_spec": "Output the number of damaged dragons.", "sample_inputs": ["1\n2\n3\n4\n12", "2\n3\n4\n5\n24"], "sample_outputs": ["12", "17"], "notes": "NoteIn the first case every first dragon got punched with a frying pan. Some of the dragons suffered from other reasons as well, but the pan alone would be enough.In the second case dragons 1, 7, 11, 13, 17, 19 and 23 escaped unharmed."}, "src_uid": "46bfdec9bfc1e91bd2f5022f3d3c8ce7"}
{"nl": {"description": "Kolya Gerasimov loves kefir very much. He lives in year 1984 and knows all the details of buying this delicious drink. One day, as you probably know, he found himself in year 2084, and buying kefir there is much more complicated.Kolya is hungry, so he went to the nearest milk shop. In 2084 you may buy kefir in a plastic liter bottle, that costs a rubles, or in glass liter bottle, that costs b rubles. Also, you may return empty glass bottle and get c (c\u2009<\u2009b) rubles back, but you cannot return plastic bottles.Kolya has n rubles and he is really hungry, so he wants to drink as much kefir as possible. There were no plastic bottles in his 1984, so Kolya doesn't know how to act optimally and asks for your help.", "input_spec": "First line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091018)\u00a0\u2014 the number of rubles Kolya has at the beginning. Then follow three lines containing integers a, b and c (1\u2009\u2264\u2009a\u2009\u2264\u20091018, 1\u2009\u2264\u2009c\u2009<\u2009b\u2009\u2264\u20091018)\u00a0\u2014 the cost of one plastic liter bottle, the cost of one glass liter bottle and the money one can get back by returning an empty glass bottle, respectively.", "output_spec": "Print the only integer\u00a0\u2014 maximum number of liters of kefir, that Kolya can drink.", "sample_inputs": ["10\n11\n9\n8", "10\n5\n6\n1"], "sample_outputs": ["2", "2"], "notes": "NoteIn the first sample, Kolya can buy one glass bottle, then return it and buy one more glass bottle. Thus he will drink 2 liters of kefir.In the second sample, Kolya can buy two plastic bottle and get two liters of kefir, or he can buy one liter glass bottle, then return it and buy one plastic bottle. In both cases he will drink two liters of kefir."}, "src_uid": "0ee9abec69230eab25de51aef0984f8f"}
{"nl": {"description": "To quickly hire highly skilled specialists one of the new IT City companies made an unprecedented move. Every employee was granted a car, and an employee can choose one of four different car makes.The parking lot before the office consists of one line of (2n\u2009-\u20092) parking spaces. Unfortunately the total number of cars is greater than the parking lot capacity. Furthermore even amount of cars of each make is greater than the amount of parking spaces! That's why there are no free spaces on the parking lot ever.Looking on the straight line of cars the company CEO thought that parking lot would be more beautiful if it contained exactly n successive cars of the same make. Help the CEO determine the number of ways to fill the parking lot this way.", "input_spec": "The only line of the input contains one integer n (3\u2009\u2264\u2009n\u2009\u2264\u200930) \u2014 the amount of successive cars of the same make.", "output_spec": "Output one integer \u2014 the number of ways to fill the parking lot by cars of four makes using the described way.", "sample_inputs": ["3"], "sample_outputs": ["24"], "notes": "NoteLet's denote car makes in the following way: A \u2014 Aston Martin, B \u2014   Bentley, M \u2014 Mercedes-Maybach, Z \u2014 Zaporozhets. For n\u2009=\u20093 there are the following appropriate ways to fill the parking lot: AAAB AAAM AAAZ ABBB AMMM AZZZ BBBA BBBM BBBZ BAAA BMMM BZZZ MMMA MMMB MMMZ MAAA MBBB MZZZ ZZZA ZZZB ZZZM ZAAA ZBBB ZMMMOriginally it was planned to grant sport cars of Ferrari, Lamborghini, Maserati and Bugatti makes but this idea was renounced because it is impossible to drive these cars having small road clearance on the worn-down roads of IT City."}, "src_uid": "3b02cbb38d0b4ddc1a6467f7647d53a9"}
{"nl": {"description": "A string a of length m is called antipalindromic iff m is even, and for each i (1\u2009\u2264\u2009i\u2009\u2264\u2009m) ai\u2009\u2260\u2009am\u2009-\u2009i\u2009+\u20091.Ivan has a string s consisting of n lowercase Latin letters; n is even. He wants to form some string t that will be an antipalindromic permutation of s. Also Ivan has denoted the beauty of index i as bi, and the beauty of t as the sum of bi among all indices i such that si\u2009=\u2009ti.Help Ivan to determine maximum possible beauty of t he can get.", "input_spec": "The first line contains one integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100, n is even) \u2014 the number of characters in s. The second line contains the string s itself. It consists of only lowercase Latin letters, and it is guaranteed that its letters can be reordered to form an antipalindromic string. The third line contains n integer numbers b1, b2, ..., bn (1\u2009\u2264\u2009bi\u2009\u2264\u2009100), where bi is the beauty of index i.", "output_spec": "Print one number \u2014 the maximum possible beauty of t.", "sample_inputs": ["8\nabacabac\n1 1 1 1 1 1 1 1", "8\nabaccaba\n1 2 3 4 5 6 7 8", "8\nabacabca\n1 2 3 4 4 3 2 1"], "sample_outputs": ["8", "26", "17"], "notes": null}, "src_uid": "896555ddb6e1c268cd7b3b6b063fce50"}
{"nl": {"description": "Two players are playing a game. First each of them writes an integer from 1 to 6, and then a dice is thrown. The player whose written number got closer to the number on the dice wins. If both payers have the same difference, it's a draw.The first player wrote number a, the second player wrote number b. How many ways to throw a dice are there, at which the first player wins, or there is a draw, or the second player wins?", "input_spec": "The single line contains two integers a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u20096)\u00a0\u2014 the numbers written on the paper by the first and second player, correspondingly.", "output_spec": "Print three integers: the number of ways to throw the dice at which the first player wins, the game ends with a draw or the second player wins, correspondingly.", "sample_inputs": ["2 5", "2 4"], "sample_outputs": ["3 0 3", "2 1 3"], "notes": "NoteThe dice is a standard cube-shaped six-sided object with each side containing a number from 1 to 6, and where all numbers on all sides are distinct.You can assume that number a is closer to number x than number b, if |a\u2009-\u2009x|\u2009<\u2009|b\u2009-\u2009x|."}, "src_uid": "504b8aae3a3abedf873a3b8b127c5dd8"}
{"nl": {"description": "Barney is standing in a bar and starring at a pretty girl. He wants to shoot her with his heart arrow but he needs to know the distance between him and the girl to make his shot accurate.  Barney asked the bar tender Carl about this distance value, but Carl was so busy talking to the customers so he wrote the distance value (it's a real number) on a napkin. The problem is that he wrote it in scientific notation. The scientific notation of some real number x is the notation of form AeB, where A is a real number and B is an integer and x\u2009=\u2009A\u2009\u00d7\u200910B is true. In our case A is between 0 and 9 and B is non-negative.Barney doesn't know anything about scientific notation (as well as anything scientific at all). So he asked you to tell him the distance value in usual decimal representation with minimal number of digits after the decimal point (and no decimal point if it is an integer). See the output format for better understanding.", "input_spec": "The first and only line of input contains a single string of form a.deb where a, d and b are integers and e is usual character 'e' (0\u2009\u2264\u2009a\u2009\u2264\u20099,\u20090\u2009\u2264\u2009d\u2009<\u200910100,\u20090\u2009\u2264\u2009b\u2009\u2264\u2009100)\u00a0\u2014 the scientific notation of the desired distance value. a and b contain no leading zeros and d contains no trailing zeros (but may be equal to 0). Also, b can not be non-zero if a is zero.", "output_spec": "Print the only real number x (the desired distance value) in the only line in its decimal notation.  Thus if x is an integer, print it's integer value without decimal part and decimal point and without leading zeroes.  Otherwise print x in a form of p.q such that p is an integer that have no leading zeroes (but may be equal to zero), and q is an integer that have no trailing zeroes (and may not be equal to zero).", "sample_inputs": ["8.549e2", "8.549e3", "0.33e0"], "sample_outputs": ["854.9", "8549", "0.33"], "notes": null}, "src_uid": "a79358099f08f3ec50c013d47d910eef"}
{"nl": {"description": "Vanya has a scales for weighing loads and weights of masses w0,\u2009w1,\u2009w2,\u2009...,\u2009w100 grams where w is some integer not less than 2 (exactly one weight of each nominal value). Vanya wonders whether he can weight an item with mass m using the given weights, if the weights can be put on both pans of the scales. Formally speaking, your task is to determine whether it is possible to place an item of mass m and some weights on the left pan of the scales, and some weights on the right pan of the scales so that the pans of the scales were in balance.", "input_spec": "The first line contains two integers w,\u2009m (2\u2009\u2264\u2009w\u2009\u2264\u2009109, 1\u2009\u2264\u2009m\u2009\u2264\u2009109) \u2014 the number defining the masses of the weights and the mass of the item.", "output_spec": "Print word 'YES' if the item can be weighted and 'NO' if it cannot.", "sample_inputs": ["3 7", "100 99", "100 50"], "sample_outputs": ["YES", "YES", "NO"], "notes": "NoteNote to the first sample test. One pan can have an item of mass 7 and a weight of mass 3, and the second pan can have two weights of masses 9 and 1, correspondingly. Then 7\u2009+\u20093\u2009=\u20099\u2009+\u20091.Note to the second sample test. One pan of the scales can have an item of mass 99 and the weight of mass 1, and the second pan can have the weight of mass 100.Note to the third sample test. It is impossible to measure the weight of the item in the manner described in the input. "}, "src_uid": "a74adcf0314692f8ac95f54d165d9582"}
{"nl": {"description": "Little Petya is learning to play chess. He has already learned how to move a king, a rook and a bishop. Let us remind you the rules of moving chess pieces. A chessboard is 64 square fields organized into an 8\u2009\u00d7\u20098 table. A field is represented by a pair of integers (r,\u2009c) \u2014 the number of the row and the number of the column (in a classical game the columns are traditionally indexed by letters). Each chess piece takes up exactly one field. To make a move is to move a chess piece, the pieces move by the following rules:  A rook moves any number of fields horizontally or vertically.  A bishop moves any number of fields diagonally.  A king moves one field in any direction \u2014 horizontally, vertically or diagonally.     The pieces move like that Petya is thinking about the following problem: what minimum number of moves is needed for each of these pieces to move from field (r1,\u2009c1) to field (r2,\u2009c2)? At that, we assume that there are no more pieces besides this one on the board. Help him solve this problem.", "input_spec": "The input contains four integers r1,\u2009c1,\u2009r2,\u2009c2 (1\u2009\u2264\u2009r1,\u2009c1,\u2009r2,\u2009c2\u2009\u2264\u20098) \u2014 the coordinates of the starting and the final field. The starting field doesn't coincide with the final one. You can assume that the chessboard rows are numbered from top to bottom 1 through 8, and the columns are numbered from left to right 1 through 8.", "output_spec": "Print three space-separated integers: the minimum number of moves the rook, the bishop and the king (in this order) is needed to move from field (r1,\u2009c1) to field (r2,\u2009c2). If a piece cannot make such a move, print a 0 instead of the corresponding number.", "sample_inputs": ["4 3 1 6", "5 5 5 6"], "sample_outputs": ["2 1 3", "1 0 1"], "notes": null}, "src_uid": "7dbf58806db185f0fe70c00b60973f4b"}
{"nl": {"description": "Princess Twilight went to Celestia and Luna's old castle to research the chest from the Elements of Harmony.  A sequence of positive integers bi is harmony if and only if for every two elements of the sequence their greatest common divisor equals 1. According to an ancient book, the key of the chest is a harmony sequence bi which minimizes the following expression:You are given sequence ai, help Princess Twilight to find the key.", "input_spec": "The first line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of elements of the sequences a and b. The next line contains n integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u200930).", "output_spec": "Output the key \u2014 sequence bi that minimizes the sum described above. If there are multiple optimal sequences, you can output any of them.", "sample_inputs": ["5\n1 1 1 1 1", "5\n1 6 4 2 8"], "sample_outputs": ["1 1 1 1 1", "1 5 3 1 8"], "notes": null}, "src_uid": "f26c74f27bbc723efd69c38ad0e523c6"}
{"nl": {"description": "There are n children in Jzzhu's school. Jzzhu is going to give some candies to them. Let's number all the children from 1 to n. The i-th child wants to get at least ai candies.Jzzhu asks children to line up. Initially, the i-th child stands at the i-th place of the line. Then Jzzhu start distribution of the candies. He follows the algorithm:  Give m candies to the first child of the line.  If this child still haven't got enough candies, then the child goes to the end of the line, else the child go home.  Repeat the first two steps while the line is not empty. Consider all the children in the order they go home. Jzzhu wants to know, which child will be the last in this order?", "input_spec": "The first line contains two integers n,\u2009m (1\u2009\u2264\u2009n\u2009\u2264\u2009100;\u00a01\u2009\u2264\u2009m\u2009\u2264\u2009100). The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009100).", "output_spec": "Output a single integer, representing the number of the last child.", "sample_inputs": ["5 2\n1 3 1 4 2", "6 4\n1 1 2 2 3 3"], "sample_outputs": ["4", "6"], "notes": "NoteLet's consider the first sample. Firstly child 1 gets 2 candies and go home. Then child 2 gets 2 candies and go to the end of the line. Currently the line looks like [3, 4, 5, 2] (indices of the children in order of the line). Then child 3 gets 2 candies and go home, and then child 4 gets 2 candies and goes to the end of the line. Currently the line looks like [5, 2, 4]. Then child 5 gets 2 candies and goes home. Then child 2 gets two candies and goes home, and finally child 4 gets 2 candies and goes home.Child 4 is the last one who goes home."}, "src_uid": "c0ef1e4d7df360c5c1e52bc6f16ca87c"}
{"nl": {"description": "You are at a water bowling training. There are l people who play with their left hand, r people, who play with their right hand, and a ambidexters, who can play with left or right hand.The coach decided to form a team of even number of players, exactly half of the players should play with their right hand, and exactly half of the players should play with their left hand. One player should use only on of his hands.Ambidexters play as well with their right hand as with their left hand. In the team, an ambidexter can play with their left hand, or with their right hand.Please find the maximum possible size of the team, where equal number of players use their left and right hands, respectively.", "input_spec": "The only line contains three integers l, r and a (0\u2009\u2264\u2009l,\u2009r,\u2009a\u2009\u2264\u2009100) \u2014 the number of left-handers, the number of right-handers and the number of ambidexters at the training. ", "output_spec": "Print a single even integer\u00a0\u2014 the maximum number of players in the team. It is possible that the team can only have zero number of players.", "sample_inputs": ["1 4 2", "5 5 5", "0 2 0"], "sample_outputs": ["6", "14", "0"], "notes": "NoteIn the first example you can form a team of 6 players. You should take the only left-hander and two ambidexters to play with left hand, and three right-handers to play with right hand. The only person left can't be taken into the team.In the second example you can form a team of 14 people. You have to take all five left-handers, all five right-handers, two ambidexters to play with left hand and two ambidexters to play with right hand."}, "src_uid": "e8148140e61baffd0878376ac5f3857c"}
{"nl": {"description": "Nikolay has a lemons, b apples and c pears. He decided to cook a compote. According to the recipe the fruits should be in the ratio 1:\u20092:\u20094. It means that for each lemon in the compote should be exactly 2 apples and exactly 4 pears. You can't crumble up, break up or cut these fruits into pieces. These fruits\u00a0\u2014 lemons, apples and pears\u00a0\u2014 should be put in the compote as whole fruits.Your task is to determine the maximum total number of lemons, apples and pears from which Nikolay can cook the compote. It is possible that Nikolay can't use any fruits, in this case print 0. ", "input_spec": "The first line contains the positive integer a (1\u2009\u2264\u2009a\u2009\u2264\u20091000)\u00a0\u2014 the number of lemons Nikolay has.  The second line contains the positive integer b (1\u2009\u2264\u2009b\u2009\u2264\u20091000)\u00a0\u2014 the number of apples Nikolay has.  The third line contains the positive integer c (1\u2009\u2264\u2009c\u2009\u2264\u20091000)\u00a0\u2014 the number of pears Nikolay has.", "output_spec": "Print the maximum total number of lemons, apples and pears from which Nikolay can cook the compote.", "sample_inputs": ["2\n5\n7", "4\n7\n13", "2\n3\n2"], "sample_outputs": ["7", "21", "0"], "notes": "NoteIn the first example Nikolay can use 1 lemon, 2 apples and 4 pears, so the answer is 1\u2009+\u20092\u2009+\u20094\u2009=\u20097.In the second example Nikolay can use 3 lemons, 6 apples and 12 pears, so the answer is 3\u2009+\u20096\u2009+\u200912\u2009=\u200921.In the third example Nikolay don't have enough pears to cook any compote, so the answer is 0. "}, "src_uid": "82a4a60eac90765fb62f2a77d2305c01"}
{"nl": {"description": "InputThe only line of the input contains a 7-digit hexadecimal number. The first \"digit\" of the number is letter A, the rest of the \"digits\" are decimal digits 0-9.OutputOutput a single integer.ExamplesInput\nA278832\nOutput\n0\nInput\nA089956\nOutput\n0\nInput\nA089957\nOutput\n1\nInput\nA144045\nOutput\n1\n", "input_spec": "The only line of the input contains a 7-digit hexadecimal number. The first \"digit\" of the number is letter A, the rest of the \"digits\" are decimal digits 0-9.", "output_spec": "Output a single integer.", "sample_inputs": ["A278832", "A089956", "A089957", "A144045"], "sample_outputs": ["0", "0", "1", "1"], "notes": null}, "src_uid": "e52bc741bb72bb8e79cf392b2d15354f"}
{"nl": {"description": "Vus the Cossack holds a programming competition, in which $$$n$$$ people participate. He decided to award them all with pens and notebooks. It is known that Vus has exactly $$$m$$$ pens and $$$k$$$ notebooks.Determine whether the Cossack can reward all participants, giving each of them at least one pen and at least one notebook.", "input_spec": "The first line contains three integers $$$n$$$, $$$m$$$, and $$$k$$$ ($$$1 \\leq n, m, k \\leq 100$$$)\u00a0\u2014 the number of participants, the number of pens, and the number of notebooks respectively.", "output_spec": "Print \"Yes\" if it possible to reward all the participants. Otherwise, print \"No\". You can print each letter in any case (upper or lower).", "sample_inputs": ["5 8 6", "3 9 3", "8 5 20"], "sample_outputs": ["Yes", "Yes", "No"], "notes": "NoteIn the first example, there are $$$5$$$ participants. The Cossack has $$$8$$$ pens and $$$6$$$ notebooks. Therefore, he has enough pens and notebooks.In the second example, there are $$$3$$$ participants. The Cossack has $$$9$$$ pens and $$$3$$$ notebooks. He has more than enough pens but only the minimum needed number of notebooks.In the third example, there are $$$8$$$ participants but only $$$5$$$ pens. Since the Cossack does not have enough pens, the answer is \"No\"."}, "src_uid": "6cd07298b23cc6ce994bb1811b9629c4"}
{"nl": {"description": "Andrey thinks he is truly a successful developer, but in reality he didn't know about the binary search algorithm until recently. After reading some literature Andrey understood that this algorithm allows to quickly find a certain number $$$x$$$ in an array. For an array $$$a$$$ indexed from zero, and an integer $$$x$$$ the pseudocode of the algorithm is as follows:  Note that the elements of the array are indexed from zero, and the division is done in integers (rounding down).Andrey read that the algorithm only works if the array is sorted. However, he found this statement untrue, because there certainly exist unsorted arrays for which the algorithm find $$$x$$$!Andrey wants to write a letter to the book authors, but before doing that he must consider the permutations of size $$$n$$$ such that the algorithm finds $$$x$$$ in them. A permutation of size $$$n$$$ is an array consisting of $$$n$$$ distinct integers between $$$1$$$ and $$$n$$$ in arbitrary order.Help Andrey and find the number of permutations of size $$$n$$$ which contain $$$x$$$ at position $$$pos$$$ and for which the given implementation of the binary search algorithm finds $$$x$$$ (returns true). As the result may be extremely large, print the remainder of its division by $$$10^9+7$$$.", "input_spec": "The only line of input contains integers $$$n$$$, $$$x$$$ and $$$pos$$$ ($$$1 \\le x \\le n \\le 1000$$$, $$$0 \\le pos \\le n - 1$$$) \u2014 the required length of the permutation, the number to search, and the required position of that number, respectively.", "output_spec": "Print a single number\u00a0\u2014 the remainder of the division of the number of valid permutations by $$$10^9+7$$$.", "sample_inputs": ["4 1 2", "123 42 24"], "sample_outputs": ["6", "824071958"], "notes": "NoteAll possible permutations in the first test case: $$$(2, 3, 1, 4)$$$, $$$(2, 4, 1, 3)$$$, $$$(3, 2, 1, 4)$$$, $$$(3, 4, 1, 2)$$$, $$$(4, 2, 1, 3)$$$, $$$(4, 3, 1, 2)$$$."}, "src_uid": "24e2f10463f440affccc2755f4462d8a"}
{"nl": {"description": "Pupils decided to go to amusement park. Some of them were with parents. In total, n people came to the park and they all want to get to the most extreme attraction and roll on it exactly once.Tickets for group of x people are sold on the attraction, there should be at least one adult in each group (it is possible that the group consists of one adult). The ticket price for such group is c1\u2009+\u2009c2\u00b7(x\u2009-\u20091)2 (in particular, if the group consists of one person, then the price is c1). All pupils who came to the park and their parents decided to split into groups in such a way that each visitor join exactly one group, and the total price of visiting the most extreme attraction is as low as possible. You are to determine this minimum possible total price. There should be at least one adult in each group. ", "input_spec": "The first line contains three integers n, c1 and c2 (1\u2009\u2264\u2009n\u2009\u2264\u2009200\u2009000, 1\u2009\u2264\u2009c1,\u2009c2\u2009\u2264\u2009107)\u00a0\u2014 the number of visitors and parameters for determining the ticket prices for a group. The second line contains the string of length n, which consists of zeros and ones. If the i-th symbol of the string is zero, then the i-th visitor is a pupil, otherwise the i-th person is an adult. It is guaranteed that there is at least one adult. It is possible that there are no pupils.", "output_spec": "Print the minimum price of visiting the most extreme attraction for all pupils and their parents. Each of them should roll on the attraction exactly once.", "sample_inputs": ["3 4 1\n011", "4 7 2\n1101"], "sample_outputs": ["8", "18"], "notes": "NoteIn the first test one group of three people should go to the attraction. Then they have to pay 4\u2009+\u20091\u2009*\u2009(3\u2009-\u20091)2\u2009=\u20098.In the second test it is better to go to the attraction in two groups. The first group should consist of two adults (for example, the first and the second person), the second should consist of one pupil and one adult (the third and the fourth person). Then each group will have a size of two and for each the price of ticket is 7\u2009+\u20092\u2009*\u2009(2\u2009-\u20091)2\u2009=\u20099. Thus, the total price for two groups is 18."}, "src_uid": "78d013b01497053b8e321fe7b6ce3760"}
{"nl": {"description": "You are working for the Gryzzl company, headquartered in Pawnee, Indiana.The new national park has been opened near Pawnee recently and you are to implement a geolocation system, so people won't get lost. The concept you developed is innovative and minimalistic. There will be $$$n$$$ antennas located somewhere in the park. When someone would like to know their current location, their Gryzzl hologram phone will communicate with antennas and obtain distances from a user's current location to all antennas.Knowing those distances and antennas locations it should be easy to recover a user's location... Right? Well, almost. The only issue is that there is no way to distinguish antennas, so you don't know, which distance corresponds to each antenna. Your task is to find a user's location given as little as all antennas location and an unordered multiset of distances.", "input_spec": "The first line of input contains a single integer $$$n$$$ ($$$2 \\leq n \\leq 10^5$$$) which is the number of antennas. The following $$$n$$$ lines contain coordinates of antennas, $$$i$$$-th line contain two integers $$$x_i$$$ and $$$y_i$$$ ($$$0 \\leq x_i,y_i \\leq 10^8$$$). It is guaranteed that no two antennas coincide. The next line of input contains integer $$$m$$$ ($$$1 \\leq n \\cdot m \\leq 10^5$$$), which is the number of queries to determine the location of the user. Following $$$m$$$ lines contain $$$n$$$ integers $$$0 \\leq d_1 \\leq d_2 \\leq \\dots \\leq d_n \\leq 2 \\cdot 10^{16}$$$ each. These integers form a multiset of squared distances from unknown user's location $$$(x;y)$$$ to antennas. For all test cases except the examples it is guaranteed that all user's locations $$$(x;y)$$$ were chosen uniformly at random, independently from each other among all possible integer locations having $$$0 \\leq x, y \\leq 10^8$$$.", "output_spec": "For each query output $$$k$$$, the number of possible a user's locations matching the given input and then output the list of these locations in lexicographic order. It is guaranteed that the sum of all $$$k$$$ over all points does not exceed $$$10^6$$$.", "sample_inputs": ["3\n0 0\n0 1\n1 0\n1\n1 1 2", "4\n0 0\n0 1\n1 0\n1 1\n2\n0 1 1 2\n2 5 5 8"], "sample_outputs": ["1 1 1", "4 0 0 0 1 1 0 1 1 \n4 -1 -1 -1 2 2 -1 2 2"], "notes": "NoteAs you see in the second example, although initially a user's location is picked to have non-negative coordinates, you have to output all possible integer locations."}, "src_uid": "057fdc41579d2e070fb7ea2ebeecb0fa"}
{"nl": {"description": "Mislove had an array $$$a_1$$$, $$$a_2$$$, $$$\\cdots$$$, $$$a_n$$$ of $$$n$$$ positive integers, but he has lost it. He only remembers the following facts about it: The number of different numbers in the array is not less than $$$l$$$ and is not greater than $$$r$$$; For each array's element $$$a_i$$$ either $$$a_i = 1$$$ or $$$a_i$$$ is even and there is a number $$$\\dfrac{a_i}{2}$$$ in the array.For example, if $$$n=5$$$, $$$l=2$$$, $$$r=3$$$ then an array could be $$$[1,2,2,4,4]$$$ or $$$[1,1,1,1,2]$$$; but it couldn't be $$$[1,2,2,4,8]$$$ because this array contains $$$4$$$ different numbers; it couldn't be $$$[1,2,2,3,3]$$$ because $$$3$$$ is odd and isn't equal to $$$1$$$; and it couldn't be $$$[1,1,2,2,16]$$$ because there is a number $$$16$$$ in the array but there isn't a number $$$\\frac{16}{2} = 8$$$.According to these facts, he is asking you to count the minimal and the maximal possible sums of all elements in an array. ", "input_spec": "The only input line contains three integers $$$n$$$, $$$l$$$ and $$$r$$$ ($$$1 \\leq n \\leq 1\\,000$$$, $$$1 \\leq l \\leq r \\leq \\min(n, 20)$$$)\u00a0\u2014 an array's size, the minimal number and the maximal number of distinct elements in an array.", "output_spec": "Output two numbers\u00a0\u2014 the minimal and the maximal possible sums of all elements in an array.", "sample_inputs": ["4 2 2", "5 1 5"], "sample_outputs": ["5 7", "5 31"], "notes": "NoteIn the first example, an array could be the one of the following: $$$[1,1,1,2]$$$, $$$[1,1,2,2]$$$ or $$$[1,2,2,2]$$$. In the first case the minimal sum is reached and in the last case the maximal sum is reached.In the second example, the minimal sum is reached at the array $$$[1,1,1,1,1]$$$, and the maximal one is reached at the array $$$[1,2,4,8,16]$$$."}, "src_uid": "ce220726392fb0cacf0ec44a7490084a"}
{"nl": {"description": "You are given three positive integers x,\u2009y,\u2009n. Your task is to find the nearest fraction to fraction  whose denominator is no more than n. Formally, you should find such pair of integers a,\u2009b (1\u2009\u2264\u2009b\u2009\u2264\u2009n;\u00a00\u2009\u2264\u2009a) that the value  is as minimal as possible.If there are multiple \"nearest\" fractions, choose the one with the minimum denominator. If there are multiple \"nearest\" fractions with the minimum denominator, choose the one with the minimum numerator.", "input_spec": "A single line contains three integers x,\u2009y,\u2009n (1\u2009\u2264\u2009x,\u2009y,\u2009n\u2009\u2264\u2009105).", "output_spec": "Print the required fraction in the format \"a/b\" (without quotes).", "sample_inputs": ["3 7 6", "7 2 4"], "sample_outputs": ["2/5", "7/2"], "notes": null}, "src_uid": "827bc6f120aff6a6f04271bc84e863ee"}
{"nl": {"description": "Mahmoud and Ehab play a game called the even-odd game. Ehab chooses his favorite integer n and then they take turns, starting from Mahmoud. In each player's turn, he has to choose an integer a and subtract it from n such that:  1\u2009\u2264\u2009a\u2009\u2264\u2009n.  If it's Mahmoud's turn, a has to be even, but if it's Ehab's turn, a has to be odd. If the current player can't choose any number satisfying the conditions, he loses. Can you determine the winner if they both play optimally?", "input_spec": "The only line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009109), the number at the beginning of the game.", "output_spec": "Output \"Mahmoud\" (without quotes) if Mahmoud wins and \"Ehab\" (without quotes) otherwise.", "sample_inputs": ["1", "2"], "sample_outputs": ["Ehab", "Mahmoud"], "notes": "NoteIn the first sample, Mahmoud can't choose any integer a initially because there is no positive even integer less than or equal to 1 so Ehab wins.In the second sample, Mahmoud has to choose a\u2009=\u20092 and subtract it from n. It's Ehab's turn and n\u2009=\u20090. There is no positive odd integer less than or equal to 0 so Mahmoud wins."}, "src_uid": "5e74750f44142624e6da41d4b35beb9a"}
{"nl": {"description": "The final match of the Berland Football Cup has been held recently. The referee has shown $$$n$$$ yellow cards throughout the match. At the beginning of the match there were $$$a_1$$$ players in the first team and $$$a_2$$$ players in the second team.The rules of sending players off the game are a bit different in Berland football. If a player from the first team receives $$$k_1$$$ yellow cards throughout the match, he can no longer participate in the match \u2014 he's sent off. And if a player from the second team receives $$$k_2$$$ yellow cards, he's sent off. After a player leaves the match, he can no longer receive any yellow cards. Each of $$$n$$$ yellow cards was shown to exactly one player. Even if all players from one team (or even from both teams) leave the match, the game still continues.The referee has lost his records on who has received each yellow card. Help him to determine the minimum and the maximum number of players that could have been thrown out of the game.", "input_spec": "The first line contains one integer $$$a_1$$$ $$$(1 \\le a_1 \\le 1\\,000)$$$ \u2014 the number of players in the first team. The second line contains one integer $$$a_2$$$ $$$(1 \\le a_2 \\le 1\\,000)$$$ \u2014 the number of players in the second team. The third line contains one integer $$$k_1$$$ $$$(1 \\le k_1 \\le 1\\,000)$$$ \u2014 the maximum number of yellow cards a player from the first team can receive (after receiving that many yellow cards, he leaves the game). The fourth line contains one integer $$$k_2$$$ $$$(1 \\le k_2 \\le 1\\,000)$$$ \u2014 the maximum number of yellow cards a player from the second team can receive (after receiving that many yellow cards, he leaves the game). The fifth line contains one integer $$$n$$$ $$$(1 \\le n \\le a_1 \\cdot k_1 + a_2 \\cdot k_2)$$$ \u2014 the number of yellow cards that have been shown during the match.", "output_spec": "Print two integers \u2014 the minimum and the maximum number of players that could have been thrown out of the game.", "sample_inputs": ["2\n3\n5\n1\n8", "3\n1\n6\n7\n25", "6\n4\n9\n10\n89"], "sample_outputs": ["0 4", "4 4", "5 9"], "notes": "NoteIn the first example it could be possible that no player left the game, so the first number in the output is $$$0$$$. The maximum possible number of players that could have been forced to leave the game is $$$4$$$ \u2014 one player from the first team, and three players from the second.In the second example the maximum possible number of yellow cards has been shown $$$(3 \\cdot 6 + 1 \\cdot 7 = 25)$$$, so in any case all players were sent off."}, "src_uid": "2be8e0b8ad4d3de2930576c0209e8b91"}
{"nl": {"description": "A stowaway and a controller play the following game. The train is represented by n wagons which are numbered with positive integers from 1 to n from the head to the tail. The stowaway and the controller are initially in some two different wagons. Every minute the train can be in one of two conditions \u2014 moving or idle. Every minute the players move.The controller's move is as follows. The controller has the movement direction \u2014 to the train's head or to its tail. During a move the controller moves to the neighbouring wagon correspondingly to its movement direction. If at the end of his move the controller enters the 1-st or the n-th wagon, that he changes the direction of his movement into the other one. In other words, the controller cyclically goes from the train's head to its tail and back again during all the time of a game, shifting during each move by one wagon. Note, that the controller always have exactly one possible move.The stowaway's move depends from the state of the train. If the train is moving, then the stowaway can shift to one of neighbouring wagons or he can stay where he is without moving. If the train is at a station and is idle, then the stowaway leaves the train (i.e. he is now not present in any train wagon) and then, if it is not the terminal train station, he enters the train again into any of n wagons (not necessarily into the one he's just left and not necessarily into the neighbouring one). If the train is idle for several minutes then each such minute the stowaway leaves the train and enters it back.Let's determine the order of the players' moves. If at the given minute the train is moving, then first the stowaway moves and then the controller does. If at this minute the train is idle, then first the stowaway leaves the train, then the controller moves and then the stowaway enters the train.If at some point in time the stowaway and the controller happen to be in one wagon, then the controller wins: he makes the stowaway pay fine. If after a while the stowaway reaches the terminal train station, then the stowaway wins: he simply leaves the station during his move and never returns there again.At any moment of time the players know each other's positions. The players play in the optimal way. Specifically, if the controller wins, then the stowaway plays so as to lose as late as possible. As all the possible moves for the controller are determined uniquely, then he is considered to play optimally always. Determine the winner.", "input_spec": "The first line contains three integers n, m and k. They represent the number of wagons in the train, the stowaway's and the controller's initial positions correspondingly (2\u2009\u2264\u2009n\u2009\u2264\u200950, 1\u2009\u2264\u2009m,\u2009k\u2009\u2264\u2009n, m\u2009\u2260\u2009k). The second line contains the direction in which a controller moves. \"to head\" means that the controller moves to the train's head and \"to tail\" means that the controller moves to its tail. It is guaranteed that in the direction in which the controller is moving, there is at least one wagon. Wagon 1 is the head, and wagon n is the tail. The third line has the length from 1 to 200 and consists of symbols \"0\" and \"1\". The i-th symbol contains information about the train's state at the i-th minute of time. \"0\" means that in this very minute the train moves and \"1\" means that the train in this very minute stands idle. The last symbol of the third line is always \"1\" \u2014 that's the terminal train station.", "output_spec": "If the stowaway wins, print \"Stowaway\" without quotes. Otherwise, print \"Controller\" again without quotes, then, separated by a space, print the number of a minute, at which the stowaway will be caught.", "sample_inputs": ["5 3 2\nto head\n0001001", "3 2 1\nto tail\n0001"], "sample_outputs": ["Stowaway", "Controller 2"], "notes": null}, "src_uid": "2222ce16926fdc697384add731819f75"}
{"nl": {"description": "Little Petya likes numbers a lot. He found that number 123 in base 16 consists of two digits: the first is 7 and the second is 11. So the sum of digits of 123 in base 16 is equal to 18.Now he wonders what is an average value of sum of digits of the number A written in all bases from 2 to A\u2009-\u20091.Note that all computations should be done in base 10. You should find the result as an irreducible fraction, written in base 10.", "input_spec": "Input contains one integer number A (3\u2009\u2264\u2009A\u2009\u2264\u20091000).", "output_spec": "Output should contain required average value in format \u00abX/Y\u00bb, where X is the numerator and Y is the denominator.", "sample_inputs": ["5", "3"], "sample_outputs": ["7/3", "2/1"], "notes": "NoteIn the first sample number 5 written in all bases from 2 to 4 looks so: 101, 12, 11. Sums of digits are 2, 3 and 2, respectively."}, "src_uid": "1366732dddecba26db232d6ca8f35fdc"}
{"nl": {"description": "Good job! Now that Heidi is able to distinguish between Poisson and uniform distributions, she is in a good position to actually estimate the populations.Can you help Heidi estimate each village's population?", "input_spec": "Same as the easy version.", "output_spec": "Output one line per village, in the same order as provided in the input, containing your (integer) population estimate. Your answer is considered correct if it is an integer that falls into the interval , where P is the real population of the village, used to create the distribution (either Poisson or uniform) from which the marmots drew their answers.", "sample_inputs": [], "sample_outputs": [], "notes": null}, "src_uid": "18bf2c587415f85df83fb090e16b8351"}
{"nl": {"description": "Bishwock is a chess figure that consists of three squares resembling an \"L-bar\". This figure can be rotated by 90, 180 and 270 degrees so it can have four possible states: XX   XX   .X   X.X.   .X   XX   XX Bishwocks don't attack any squares and can even occupy on the adjacent squares as long as they don't occupy the same square. Vasya has a board with $$$2\\times n$$$ squares onto which he wants to put some bishwocks. To his dismay, several squares on this board are already occupied by pawns and Vasya can't put bishwocks there. However, pawns also don't attack bishwocks and they can occupy adjacent squares peacefully.Knowing the positions of pawns on the board, help Vasya to determine the maximum amount of bishwocks he can put onto the board so that they wouldn't occupy the same squares and wouldn't occupy squares with pawns.", "input_spec": "The input contains two nonempty strings that describe Vasya's board. Those strings contain only symbols \"0\" (zero) that denote the empty squares and symbols \"X\" (uppercase English letter) that denote the squares occupied by pawns. Strings are nonempty and are of the same length that does not exceed $$$100$$$.", "output_spec": "Output a single integer\u00a0\u2014 the maximum amount of bishwocks that can be placed onto the given board.", "sample_inputs": ["00\n00", "00X00X0XXX0\n0XXX0X00X00", "0X0X0\n0X0X0", "0XXX0\n00000"], "sample_outputs": ["1", "4", "0", "2"], "notes": null}, "src_uid": "e6b3e787919e96fc893a034eae233fc6"}
{"nl": {"description": "A system of n vessels with water is given. Several pairs of vessels are connected by tubes with transfusion mechanisms. One may transfer an integer amount of liters of water between two vessels connected by such tube (tube works in both directions). There might be multiple tubes between two vessels. Total number of tubes equals e. Volume of each vessel equals v liters. Of course, the amount of the water in any vessel cannot exceed v liters in the process of transfusions.Given the initial amounts ai of water in the vessels and the desired amounts bi find a sequence of transfusions that deals with the task. Total number of transfusions must not exceed 2\u00b7n2.", "input_spec": "First line of the input contains integers n, v, e (1\u2009\u2264\u2009n\u2009\u2264\u2009300, 1\u2009\u2264\u2009v\u2009\u2264\u2009109, 0\u2009\u2264\u2009e\u2009\u2264\u200950000). Next two lines contain n integers each: initial ai and the desired amounts bi of water in corresponding vessels (0\u2009\u2264\u2009ai,\u2009bi\u2009\u2264\u2009v). Next e lines describe one tube each in the format x y (1\u2009\u2264\u2009x,\u2009y\u2009\u2264\u2009n,\u2009x\u2009\u2260\u2009y) for a tube between vessels number x and y. There might be multiple tubes between two vessels. You may assume that vessels are numbered from 1 to n in some way.", "output_spec": "Print \"NO\" (without quotes), if such sequence of transfusions does not exist. Otherwise print any suitable sequence in the following format. On the first line print the total number of transfusions k (k should not exceed 2\u00b7n2). In the following k lines print transfusions in the format x\u00a0y\u00a0d (transfusion of d liters from the vessel number x to the vessel number y, x and y must be distinct). For all transfusions d must be a non-negative integer.", "sample_inputs": ["2 10 1\n1 9\n5 5\n1 2", "2 10 0\n5 2\n4 2", "2 10 0\n4 2\n4 2"], "sample_outputs": ["1\n2 1 4", "NO", "0"], "notes": null}, "src_uid": "0939354d9bad8301efb79a1a934ded30"}
{"nl": {"description": "During the break the schoolchildren, boys and girls, formed a queue of n people in the canteen. Initially the children stood in the order they entered the canteen. However, after a while the boys started feeling awkward for standing in front of the girls in the queue and they started letting the girls move forward each second. Let's describe the process more precisely. Let's say that the positions in the queue are sequentially numbered by integers from 1 to n, at that the person in the position number 1 is served first. Then, if at time x a boy stands on the i-th position and a girl stands on the (i\u2009+\u20091)-th position, then at time x\u2009+\u20091 the i-th position will have a girl and the (i\u2009+\u20091)-th position will have a boy. The time is given in seconds.You've got the initial position of the children, at the initial moment of time. Determine the way the queue is going to look after t seconds.", "input_spec": "The first line contains two integers n and t (1\u2009\u2264\u2009n,\u2009t\u2009\u2264\u200950), which represent the number of children in the queue and the time after which the queue will transform into the arrangement you need to find.  The next line contains string s, which represents the schoolchildren's initial arrangement. If the i-th position in the queue contains a boy, then the i-th character of string s equals \"B\", otherwise the i-th character equals \"G\".", "output_spec": "Print string a, which describes the arrangement after t seconds. If the i-th position has a boy after the needed time, then the i-th character a must equal \"B\", otherwise it must equal \"G\".", "sample_inputs": ["5 1\nBGGBG", "5 2\nBGGBG", "4 1\nGGGB"], "sample_outputs": ["GBGGB", "GGBGB", "GGGB"], "notes": null}, "src_uid": "964ed316c6e6715120039b0219cc653a"}
{"nl": {"description": "Bear Limak likes watching sports on TV. He is going to watch a game today. The game lasts 90 minutes and there are no breaks.Each minute can be either interesting or boring. If 15 consecutive minutes are boring then Limak immediately turns TV off.You know that there will be n interesting minutes t1,\u2009t2,\u2009...,\u2009tn. Your task is to calculate for how many minutes Limak will watch the game.", "input_spec": "The first line of the input contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u200990)\u00a0\u2014 the number of interesting minutes. The second line contains n integers t1,\u2009t2,\u2009...,\u2009tn (1\u2009\u2264\u2009t1\u2009<\u2009t2\u2009<\u2009... tn\u2009\u2264\u200990), given in the increasing order.", "output_spec": "Print the number of minutes Limak will watch the game.", "sample_inputs": ["3\n7 20 88", "9\n16 20 30 40 50 60 70 80 90", "9\n15 20 30 40 50 60 70 80 90"], "sample_outputs": ["35", "15", "90"], "notes": "NoteIn the first sample, minutes 21,\u200922,\u2009...,\u200935 are all boring and thus Limak will turn TV off immediately after the 35-th minute. So, he would watch the game for 35 minutes.In the second sample, the first 15 minutes are boring.In the third sample, there are no consecutive 15 boring minutes. So, Limak will watch the whole game."}, "src_uid": "5031b15e220f0ff6cc1dd3731ecdbf27"}
{"nl": {"description": "A large banner with word CODEFORCES was ordered for the 1000-th onsite round of Codeforces\u03c9 that takes place on the Miami beach. Unfortunately, the company that made the banner mixed up two orders and delivered somebody else's banner that contains someone else's word. The word on the banner consists only of upper-case English letters.There is very little time to correct the mistake. All that we can manage to do is to cut out some substring from the banner, i.e. several consecutive letters. After that all the resulting parts of the banner will be glued into a single piece (if the beginning or the end of the original banner was cut out, only one part remains); it is not allowed change the relative order of parts of the banner (i.e. after a substring is cut, several first and last letters are left, it is allowed only to glue the last letters to the right of the first letters). Thus, for example, for example, you can cut a substring out from string 'TEMPLATE' and get string 'TEMPLE' (if you cut out string AT), 'PLATE' (if you cut out TEM), 'T' (if you cut out EMPLATE), etc.Help the organizers of the round determine whether it is possible to cut out of the banner some substring in such a way that the remaining parts formed word CODEFORCES.", "input_spec": "The single line of the input contains the word written on the banner. The word only consists of upper-case English letters. The word is non-empty and its length doesn't exceed 100 characters. It is guaranteed that the word isn't word CODEFORCES.", "output_spec": "Print 'YES', if there exists a way to cut out the substring, and 'NO' otherwise (without the quotes).", "sample_inputs": ["CODEWAITFORITFORCES", "BOTTOMCODER", "DECODEFORCES", "DOGEFORCES"], "sample_outputs": ["YES", "NO", "YES", "NO"], "notes": null}, "src_uid": "bda4b15827c94b526643dfefc4bc36e7"}
{"nl": {"description": "One day Vasya came across three Berland coins. They didn't have any numbers that's why Vasya didn't understand how their denominations differ. He supposed that if one coin is heavier than the other one, then it should be worth more. Vasya weighed all the three pairs of coins on pan balance scales and told you the results. Find out how the deminations of the coins differ or if Vasya has a mistake in the weighting results. No two coins are equal.", "input_spec": "The input data contains the results of all the weighting, one result on each line. It is guaranteed that every coin pair was weighted exactly once. Vasya labelled the coins with letters \u00abA\u00bb, \u00abB\u00bb and \u00abC\u00bb. Each result is a line that appears as (letter)(> or < sign)(letter). For example, if coin \"A\" proved lighter than coin \"B\", the result of the weighting is A<B.", "output_spec": "It the results are contradictory, print Impossible. Otherwise, print without spaces the rearrangement of letters \u00abA\u00bb, \u00abB\u00bb and \u00abC\u00bb which represent the coins in the increasing order of their weights.", "sample_inputs": ["A>B\nC<B\nA>C", "A<B\nB>C\nC>A"], "sample_outputs": ["CBA", "ACB"], "notes": null}, "src_uid": "97fd9123d0fb511da165b900afbde5dc"}
{"nl": {"description": "Vasya lives in a round building, whose entrances are numbered sequentially by integers from 1 to n. Entrance n and entrance 1 are adjacent.Today Vasya got bored and decided to take a walk in the yard. Vasya lives in entrance a and he decided that during his walk he will move around the house b entrances in the direction of increasing numbers (in this order entrance n should be followed by entrance 1). The negative value of b corresponds to moving |b| entrances in the order of decreasing numbers (in this order entrance 1 is followed by entrance n). If b\u2009=\u20090, then Vasya prefers to walk beside his entrance.    Illustration for n\u2009=\u20096, a\u2009=\u20092, b\u2009=\u2009\u2009-\u20095. Help Vasya to determine the number of the entrance, near which he will be at the end of his walk.", "input_spec": "The single line of the input contains three space-separated integers n, a and b (1\u2009\u2264\u2009n\u2009\u2264\u2009100,\u20091\u2009\u2264\u2009a\u2009\u2264\u2009n,\u2009\u2009-\u2009100\u2009\u2264\u2009b\u2009\u2264\u2009100)\u00a0\u2014 the number of entrances at Vasya's place, the number of his entrance and the length of his walk, respectively.", "output_spec": "Print a single integer k (1\u2009\u2264\u2009k\u2009\u2264\u2009n)\u00a0\u2014 the number of the entrance where Vasya will be at the end of his walk.", "sample_inputs": ["6 2 -5", "5 1 3", "3 2 7"], "sample_outputs": ["3", "4", "3"], "notes": "NoteThe first example is illustrated by the picture in the statements."}, "src_uid": "cd0e90042a6aca647465f1d51e6dffc4"}
{"nl": {"description": "The only difference between easy and hard versions is constraints.Polycarp loves to listen to music, so he never leaves the player, even on the way home from the university. Polycarp overcomes the distance from the university to the house in exactly $$$T$$$ minutes.In the player, Polycarp stores $$$n$$$ songs, each of which is characterized by two parameters: $$$t_i$$$ and $$$g_i$$$, where $$$t_i$$$ is the length of the song in minutes ($$$1 \\le t_i \\le 15$$$), $$$g_i$$$ is its genre ($$$1 \\le g_i \\le 3$$$).Polycarp wants to create such a playlist so that he can listen to music all the time on the way from the university to his home, and at the time of his arrival home, the playlist is over. Polycarp never interrupts songs and always listens to them from beginning to end. Thus, if he started listening to the $$$i$$$-th song, he would spend exactly $$$t_i$$$ minutes on its listening. Polycarp also does not like when two songs of the same genre play in a row (i.e. successively/adjacently) or when the songs in his playlist are repeated.Help Polycarpus count the number of different sequences of songs (their order matters), the total duration is exactly $$$T$$$, such that there are no two consecutive songs of the same genre in them and all the songs in the playlist are different.", "input_spec": "The first line of the input contains two integers $$$n$$$ and $$$T$$$ ($$$1 \\le n \\le 15, 1 \\le T \\le 225$$$) \u2014 the number of songs in the player and the required total duration, respectively. Next, the $$$n$$$ lines contain descriptions of songs: the $$$i$$$-th line contains two integers $$$t_i$$$ and $$$g_i$$$ ($$$1 \\le t_i \\le 15, 1 \\le g_i \\le 3$$$) \u2014 the duration of the $$$i$$$-th song and its genre, respectively.", "output_spec": "Output one integer \u2014 the number of different sequences of songs, the total length of exactly $$$T$$$, such that there are no two consecutive songs of the same genre in them and all the songs in the playlist are different. Since the answer may be huge, output it modulo $$$10^9 + 7$$$ (that is, the remainder when dividing the quantity by $$$10^9 + 7$$$).", "sample_inputs": ["3 3\n1 1\n1 2\n1 3", "3 3\n1 1\n1 1\n1 3", "4 10\n5 3\n2 1\n3 2\n5 1"], "sample_outputs": ["6", "2", "10"], "notes": "NoteIn the first example, Polycarp can make any of the $$$6$$$ possible playlist by rearranging the available songs: $$$[1, 2, 3]$$$, $$$[1, 3, 2]$$$, $$$[2, 1, 3]$$$, $$$[2, 3, 1]$$$, $$$[3, 1, 2]$$$ and $$$[3, 2, 1]$$$ (indices of the songs are given).In the second example, the first and second songs cannot go in succession (since they have the same genre). Thus, Polycarp can create a playlist in one of $$$2$$$ possible ways: $$$[1, 3, 2]$$$ and $$$[2, 3, 1]$$$ (indices of the songs are given).In the third example, Polycarp can make the following playlists: $$$[1, 2, 3]$$$, $$$[1, 3, 2]$$$, $$$[2, 1, 3]$$$, $$$[2, 3, 1]$$$, $$$[3, 1, 2]$$$, $$$[3, 2, 1]$$$, $$$[1, 4]$$$, $$$[4, 1]$$$, $$$[2, 3, 4]$$$ and $$$[4, 3, 2]$$$ (indices of the songs are given)."}, "src_uid": "ac2a37ff4c7e89a345b189e4891bbf56"}
{"nl": {"description": "Vasya is very upset that many people on the Net mix uppercase and lowercase letters in one word. That's why he decided to invent an extension for his favorite browser that would change the letters' register in every word so that it either only consisted of lowercase letters or, vice versa, only of uppercase ones. At that as little as possible letters should be changed in the word. For example, the word HoUse must be replaced with house, and the word ViP \u2014 with VIP. If a word contains an equal number of uppercase and lowercase letters, you should replace all the letters with lowercase ones. For example, maTRIx should be replaced by matrix. Your task is to use the given method on one given word.", "input_spec": "The first line contains a word s \u2014 it consists of uppercase and lowercase Latin letters and possesses the length from 1 to 100.", "output_spec": "Print the corrected word s. If the given word s has strictly more uppercase letters, make the word written in the uppercase register, otherwise - in the lowercase one.", "sample_inputs": ["HoUse", "ViP", "maTRIx"], "sample_outputs": ["house", "VIP", "matrix"], "notes": null}, "src_uid": "b432dfa66bae2b542342f0b42c0a2598"}
{"nl": {"description": "Mad scientist Mike is building a time machine in his spare time. To finish the work, he needs a resistor with a certain resistance value.However, all Mike has is lots of identical resistors with unit resistance R0\u2009=\u20091. Elements with other resistance can be constructed from these resistors. In this problem, we will consider the following as elements:   one resistor;  an element and one resistor plugged in sequence;  an element and one resistor plugged in parallel.   With the consecutive connection the resistance of the new element equals R\u2009=\u2009Re\u2009+\u2009R0. With the parallel connection the resistance of the new element equals . In this case Re equals the resistance of the element being connected.Mike needs to assemble an element with a resistance equal to the fraction . Determine the smallest possible number of resistors he needs to make such an element.", "input_spec": "The single input line contains two space-separated integers a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u20091018). It is guaranteed that the fraction  is irreducible. It is guaranteed that a solution always exists.", "output_spec": "Print a single number \u2014 the answer to the problem. Please do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is recommended to use the cin, cout streams or the %I64d specifier.", "sample_inputs": ["1 1", "3 2", "199 200"], "sample_outputs": ["1", "3", "200"], "notes": "NoteIn the first sample, one resistor is enough.In the second sample one can connect the resistors in parallel, take the resulting element and connect it to a third resistor consecutively. Then, we get an element with resistance . We cannot make this element using two resistors."}, "src_uid": "792efb147f3668a84c866048361970f8"}
{"nl": {"description": "You have a plate and you want to add some gilding to it. The plate is a rectangle that we split into $$$w\\times h$$$ cells. There should be $$$k$$$ gilded rings, the first one should go along the edge of the plate, the second one\u00a0\u2014 $$$2$$$ cells away from the edge and so on. Each ring has a width of $$$1$$$ cell. Formally, the $$$i$$$-th of these rings should consist of all bordering cells on the inner rectangle of size $$$(w - 4(i - 1))\\times(h - 4(i - 1))$$$.  The picture corresponds to the third example. Your task is to compute the number of cells to be gilded.", "input_spec": "The only line contains three integers $$$w$$$, $$$h$$$ and $$$k$$$ ($$$3 \\le w, h \\le 100$$$, $$$1 \\le k \\le \\left\\lfloor \\frac{min(n, m) + 1}{4}\\right\\rfloor$$$, where $$$\\lfloor x \\rfloor$$$ denotes the number $$$x$$$ rounded down) \u2014 the number of rows, columns and the number of rings, respectively.", "output_spec": "Print a single positive integer\u00a0\u2014 the number of cells to be gilded.", "sample_inputs": ["3 3 1", "7 9 1", "7 9 2"], "sample_outputs": ["8", "28", "40"], "notes": "NoteThe first example is shown on the picture below.  The second example is shown on the picture below.  The third example is shown in the problem description."}, "src_uid": "2c98d59917337cb321d76f72a1b3c057"}
{"nl": {"description": "Little Petya very much likes computers. Recently he has received a new \"Ternatron IV\" as a gift from his mother. Unlike other modern computers, \"Ternatron IV\" operates with ternary and not binary logic. Petya immediately wondered how the xor operation is performed on this computer (and whether there is anything like it).It turned out that the operation does exist (however, it is called tor) and it works like this. Suppose that we need to calculate the value of the expression a tor b. Both numbers a and b are written in the ternary notation one under the other one (b under a). If they have a different number of digits, then leading zeroes are added to the shorter number until the lengths are the same. Then the numbers are summed together digit by digit. The result of summing each two digits is calculated modulo 3. Note that there is no carry between digits (i. e. during this operation the digits aren't transferred). For example: 1410 tor 5010\u2009=\u200901123 tor 12123\u2009=\u200910213\u2009=\u20093410.Petya wrote numbers a and c on a piece of paper. Help him find such number b, that a tor b\u2009=\u2009c. If there are several such numbers, print the smallest one.", "input_spec": "The first line contains two integers a and c (0\u2009\u2264\u2009a,\u2009c\u2009\u2264\u2009109). Both numbers are written in decimal notation.", "output_spec": "Print the single integer b, such that a tor b\u2009=\u2009c. If there are several possible numbers b, print the smallest one. You should print the number in decimal notation.", "sample_inputs": ["14 34", "50 34", "387420489 225159023", "5 5"], "sample_outputs": ["50", "14", "1000000001", "0"], "notes": null}, "src_uid": "5fb635d52ddccf6a4d5103805da02a88"}
{"nl": {"description": "Heidi the Cow is aghast: cracks in the northern Wall? Zombies gathering outside, forming groups, preparing their assault? This must not happen! Quickly, she fetches her HC2 (Handbook of Crazy Constructions) and looks for the right chapter:How to build a wall:  Take a set of bricks.  Select one of the possible wall designs. Computing the number of possible designs is left as an exercise to the reader.  Place bricks on top of each other, according to the chosen design. This seems easy enough. But Heidi is a Coding Cow, not a Constructing Cow. Her mind keeps coming back to point 2b. Despite the imminent danger of a zombie onslaught, she wonders just how many possible walls she could build with up to n bricks.A wall is a set of wall segments as defined in the easy version. How many different walls can be constructed such that the wall consists of at least 1 and at most n bricks? Two walls are different if there exist a column c and a row r such that one wall has a brick in this spot, and the other does not.Along with n, you will be given C, the width of the wall (as defined in the easy version). Return the number of different walls modulo 106\u2009+\u20093.", "input_spec": "The first line contains two space-separated integers n and C, 1\u2009\u2264\u2009n\u2009\u2264\u2009500000, 1\u2009\u2264\u2009C\u2009\u2264\u2009200000.", "output_spec": "Print the number of different walls that Heidi could build, modulo 106\u2009+\u20093.", "sample_inputs": ["5 1", "2 2", "3 2", "11 5", "37 63"], "sample_outputs": ["5", "5", "9", "4367", "230574"], "notes": "NoteThe number 106\u2009+\u20093 is prime.In the second sample case, the five walls are:             B        BB., .B, BB, B., and .BIn the third sample case, the nine walls are the five as in the second sample case and in addition the following four: B    BB    B  B        BB., .B, BB, and BB"}, "src_uid": "e63c70a9c96a94bce99618f2e695f83a"}
{"nl": {"description": "Rikhail Mubinchik believes that the current definition of prime numbers is obsolete as they are too complex and unpredictable. A palindromic number is another matter. It is aesthetically pleasing, and it has a number of remarkable properties. Help Rikhail to convince the scientific community in this!Let us remind you that a number is called prime if it is integer larger than one, and is not divisible by any positive integer other than itself and one.Rikhail calls a number a palindromic if it is integer, positive, and its decimal representation without leading zeros is a palindrome, i.e. reads the same from left to right and right to left.One problem with prime numbers is that there are too many of them. Let's introduce the following notation: \u03c0(n)\u00a0\u2014 the number of primes no larger than n, rub(n)\u00a0\u2014 the number of palindromic numbers no larger than n. Rikhail wants to prove that there are a lot more primes than palindromic ones.He asked you to solve the following problem: for a given value of the coefficient A find the maximum n, such that \u03c0(n)\u2009\u2264\u2009A\u00b7rub(n).", "input_spec": "The input consists of two positive integers p, q, the numerator and denominator of the fraction that is the value of A\u00a0(,\u00a0).", "output_spec": "If such maximum number exists, then print it. Otherwise, print \"Palindromic tree is better than splay tree\" (without the quotes).", "sample_inputs": ["1 1", "1 42", "6 4"], "sample_outputs": ["40", "1", "172"], "notes": null}, "src_uid": "e6e760164882b9e194a17663625be27d"}
{"nl": {"description": "The Duck songFor simplicity, we'll assume that there are only three types of grapes: green grapes, purple grapes and black grapes.Andrew, Dmitry and Michal are all grapes' lovers, however their preferences of grapes are different. To make all of them happy, the following should happen: Andrew, Dmitry and Michal should eat at least $$$x$$$, $$$y$$$ and $$$z$$$ grapes, respectively. Andrew has an extreme affinity for green grapes, thus he will eat green grapes and green grapes only. On the other hand, Dmitry is not a fan of black grapes\u00a0\u2014 any types of grapes except black would do for him. In other words, Dmitry can eat green and purple grapes. Michal has a common taste\u00a0\u2014 he enjoys grapes in general and will be pleased with any types of grapes, as long as the quantity is sufficient.Knowing that his friends are so fond of grapes, Aki decided to host a grape party with them. He has prepared a box with $$$a$$$ green grapes, $$$b$$$ purple grapes and $$$c$$$ black grapes.However, Aki isn't sure if the box he prepared contains enough grapes to make everyone happy. Can you please find out whether it's possible to distribute grapes so that everyone is happy or Aki has to buy some more grapes?It is not required to distribute all the grapes, so it's possible that some of them will remain unused.", "input_spec": "The first line contains three integers $$$x$$$, $$$y$$$ and $$$z$$$ ($$$1 \\le x, y, z \\le 10^5$$$)\u00a0\u2014 the number of grapes Andrew, Dmitry and Michal want to eat. The second line contains three integers $$$a$$$, $$$b$$$, $$$c$$$ ($$$1 \\le a, b, c \\le 10^5$$$)\u00a0\u2014 the number of green, purple and black grapes in the box.", "output_spec": "If there is a grape distribution that allows everyone to be happy, print \"YES\", otherwise print \"NO\".", "sample_inputs": ["1 6 2\n4 3 3", "5 1 1\n4 3 2"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example, there is only one possible distribution:Andrew should take $$$1$$$ green grape, Dmitry should take $$$3$$$ remaining green grapes and $$$3$$$ purple grapes, and Michal will take $$$2$$$ out of $$$3$$$ available black grapes.In the second test, there is no possible distribution, since Andrew is not be able to eat enough green grapes. :("}, "src_uid": "d54201591f7284da5e9ce18984439f4e"}
{"nl": {"description": "A number is called quasibinary if its decimal representation contains only digits 0 or 1. For example, numbers 0, 1, 101, 110011\u00a0\u2014 are quasibinary and numbers 2, 12, 900 are not.You are given a positive integer n. Represent it as a sum of minimum number of quasibinary numbers.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009106).", "output_spec": "In the first line print a single integer k\u00a0\u2014 the minimum number of numbers in the representation of number n as a sum of quasibinary numbers. In the second line print k numbers \u2014 the elements of the sum. All these numbers should be quasibinary according to the definition above, their sum should equal n. Do not have to print the leading zeroes in the numbers. The order of numbers doesn't matter. If there are multiple possible representations, you are allowed to print any of them.", "sample_inputs": ["9", "32"], "sample_outputs": ["9\n1 1 1 1 1 1 1 1 1", "3\n10 11 11"], "notes": null}, "src_uid": "033068c5e16d25f09039e29c88474275"}
{"nl": {"description": "Having stayed home alone, Petya decided to watch forbidden films on the Net in secret. \"What ungentlemanly behavior!\" \u2014 you can say that, of course, but don't be too harsh on the kid. In his country films about the Martians and other extraterrestrial civilizations are forbidden. It was very unfair to Petya as he adored adventure stories that featured lasers and robots. Today Petya is watching a shocking blockbuster about the Martians called \"R2:D2\". What can \"R2:D2\" possibly mean? It might be the Martian time represented in the Martian numeral system. Petya knows that time on Mars is counted just like on the Earth (that is, there are 24 hours and each hour has 60 minutes). The time is written as \"a:b\", where the string a stands for the number of hours (from 0 to 23 inclusive), and string b stands for the number of minutes (from 0 to 59 inclusive). The only thing Petya doesn't know is in what numeral system the Martian time is written.Your task is to print the radixes of all numeral system which can contain the time \"a:b\".", "input_spec": "The first line contains a single string as \"a:b\" (without the quotes). There a is a non-empty string, consisting of numbers and uppercase Latin letters. String a shows the number of hours. String b is a non-empty string that consists of numbers and uppercase Latin letters. String b shows the number of minutes. The lengths of strings a and b are from 1 to 5 characters, inclusive. Please note that strings a and b can have leading zeroes that do not influence the result in any way (for example, string \"008:1\" in decimal notation denotes correctly written time). We consider characters 0, 1, ..., 9 as denoting the corresponding digits of the number's representation in some numeral system, and characters A, B, ..., Z correspond to numbers 10, 11, ..., 35.", "output_spec": "Print the radixes of the numeral systems that can represent the time \"a:b\" in the increasing order. Separate the numbers with spaces or line breaks. If there is no numeral system that can represent time \"a:b\", print the single integer 0. If there are infinitely many numeral systems that can represent the time \"a:b\", print the single integer -1. Note that on Mars any positional numeral systems with positive radix strictly larger than one are possible.", "sample_inputs": ["11:20", "2A:13", "000B:00001"], "sample_outputs": ["3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22", "0", "-1"], "notes": "NoteLet's consider the first sample. String \"11:20\" can be perceived, for example, as time 4:6, represented in the ternary numeral system or as time 17:32 in hexadecimal system. Let's consider the second sample test. String \"2A:13\" can't be perceived as correct time in any notation. For example, let's take the base-11 numeral notation. There the given string represents time 32:14 that isn't a correct time.Let's consider the third sample. String \"000B:00001\" can be perceived as a correct time in the infinite number of numeral systems. If you need an example, you can take any numeral system with radix no less than 12."}, "src_uid": "c02dfe5b8d9da2818a99c3afbe7a5293"}
{"nl": {"description": "Everybody in Russia uses Gregorian calendar. In this calendar there are 31 days in January, 28 or 29 days in February (depending on whether the year is leap or not), 31 days in March, 30 days in April, 31 days in May, 30 in June, 31 in July, 31 in August, 30 in September, 31 in October, 30 in November, 31 in December.A year is leap in one of two cases: either its number is divisible by 4, but not divisible by 100, or is divisible by 400. For example, the following years are leap: 2000, 2004, but years 1900 and 2018 are not leap.In this problem you are given n (1\u2009\u2264\u2009n\u2009\u2264\u200924) integers a1,\u2009a2,\u2009...,\u2009an, and you have to check if these integers could be durations in days of n consecutive months, according to Gregorian calendar. Note that these months could belong to several consecutive years. In other words, check if there is a month in some year, such that its duration is a1 days, duration of the next month is a2 days, and so on.", "input_spec": "The first line contains single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200924) \u2014 the number of integers. The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (28\u2009\u2264\u2009ai\u2009\u2264\u200931) \u2014 the numbers you are to check.", "output_spec": "If there are several consecutive months that fit the sequence, print \"YES\" (without quotes). Otherwise, print \"NO\" (without quotes). You can print each letter in arbitrary case (small or large).", "sample_inputs": ["4\n31 31 30 31", "2\n30 30", "5\n29 31 30 31 30", "3\n31 28 30", "3\n31 31 28"], "sample_outputs": ["Yes", "No", "Yes", "No", "Yes"], "notes": "NoteIn the first example the integers can denote months July, August, September and October.In the second example the answer is no, because there are no two consecutive months each having 30 days.In the third example the months are: February (leap year) \u2014 March \u2014 April \u2013 May \u2014 June.In the fourth example the number of days in the second month is 28, so this is February. March follows February and has 31 days, but not 30, so the answer is NO.In the fifth example the months are: December \u2014 January \u2014 February (non-leap year)."}, "src_uid": "d60c8895cebcc5d0c6459238edbdb945"}
{"nl": {"description": "The start of the new academic year brought about the problem of accommodation students into dormitories. One of such dormitories has a a\u2009\u00d7\u2009b square meter wonder room. The caretaker wants to accommodate exactly n students there. But the law says that there must be at least 6 square meters per student in a room (that is, the room for n students must have the area of at least 6n square meters). The caretaker can enlarge any (possibly both) side of the room by an arbitrary positive integer of meters. Help him change the room so as all n students could live in it and the total area of the room was as small as possible.", "input_spec": "The first line contains three space-separated integers n, a and b (1\u2009\u2264\u2009n,\u2009a,\u2009b\u2009\u2264\u2009109) \u2014 the number of students and the sizes of the room.", "output_spec": "Print three integers s, a1 and b1 (a\u2009\u2264\u2009a1;\u00a0b\u2009\u2264\u2009b1) \u2014 the final area of the room and its sizes. If there are multiple optimal solutions, print any of them.", "sample_inputs": ["3 3 5", "2 4 4"], "sample_outputs": ["18\n3 6", "16\n4 4"], "notes": null}, "src_uid": "6a2a584d36008151d18e5080aea5029c"}
{"nl": {"description": "InputThe input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.OutputOutput \"YES\" or \"NO\".ExamplesInput\nGENIUS\nOutput\nYES\nInput\nDOCTOR\nOutput\nNO\nInput\nIRENE\nOutput\nYES\nInput\nMARY\nOutput\nNO\nInput\nSMARTPHONE\nOutput\nNO\nInput\nREVOLVER\nOutput\nYES\nInput\nHOLMES\nOutput\nNO\nInput\nWATSON\nOutput\nYES\n", "input_spec": "The input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.", "output_spec": "Output \"YES\" or \"NO\".", "sample_inputs": ["GENIUS", "DOCTOR", "IRENE", "MARY", "SMARTPHONE", "REVOLVER", "HOLMES", "WATSON"], "sample_outputs": ["YES", "NO", "YES", "NO", "NO", "YES", "NO", "YES"], "notes": null}, "src_uid": "d0ad35798119f98320967127c43ae88d"}
{"nl": {"description": "Jabber ID on the national Berland service \u00abBabber\u00bb has a form <username>@<hostname>[/resource], where   <username> \u2014 is a sequence of Latin letters (lowercase or uppercase), digits or underscores characters \u00ab_\u00bb, the length of <username> is between 1 and 16, inclusive.  <hostname> \u2014 is a sequence of word separated by periods (characters \u00ab.\u00bb), where each word should contain only characters allowed for <username>, the length of each word is between 1 and 16, inclusive. The length of <hostname> is between 1 and 32, inclusive.  <resource> \u2014 is a sequence of Latin letters (lowercase or uppercase), digits or underscores characters \u00ab_\u00bb, the length of <resource> is between 1 and 16, inclusive. The content of square brackets is optional \u2014 it can be present or can be absent.There are the samples of correct Jabber IDs: mike@codeforces.com, 007@en.codeforces.com/contest.Your task is to write program which checks if given string is a correct Jabber ID.", "input_spec": "The input contains of a single line. The line has the length between 1 and 100 characters, inclusive. Each characters has ASCII-code between 33 and 127, inclusive.", "output_spec": "Print YES or NO.", "sample_inputs": ["mike@codeforces.com", "john.smith@codeforces.ru/contest.icpc/12"], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "2a68157e327f92415067f127feb31e24"}
{"nl": {"description": "Amr is a young coder who likes music a lot. He always wanted to learn how to play music but he was busy coding so he got an idea.Amr has n instruments, it takes ai days to learn i-th instrument. Being busy, Amr dedicated k days to learn how to play the maximum possible number of instruments.Amr asked for your help to distribute his free days between instruments so that he can achieve his goal.", "input_spec": "The first line contains two numbers n, k (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 0\u2009\u2264\u2009k\u2009\u2264\u200910\u2009000), the number of instruments and number of days respectively. The second line contains n integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009100), representing number of days required to learn the i-th instrument.", "output_spec": "In the first line output one integer m representing the maximum number of instruments Amr can learn. In the second line output m space-separated integers: the indices of instruments to be learnt. You may output indices in any order. if there are multiple optimal solutions output any. It is not necessary to use all days for studying.", "sample_inputs": ["4 10\n4 3 1 2", "5 6\n4 3 1 1 2", "1 3\n4"], "sample_outputs": ["4\n1 2 3 4", "3\n1 3 4", "0"], "notes": "NoteIn the first test Amr can learn all 4 instruments.In the second test other possible solutions are: {2,\u20093,\u20095} or {3,\u20094,\u20095}.In the third test Amr doesn't have enough time to learn the only presented instrument."}, "src_uid": "dbb164a8dd190e63cceba95a31690a7c"}
{"nl": {"description": "Calvin the robot lies in an infinite rectangular grid. Calvin's source code contains a list of n commands, each either 'U', 'R', 'D', or 'L'\u00a0\u2014 instructions to move a single square up, right, down, or left, respectively. How many ways can Calvin execute a non-empty contiguous substrings of commands and return to the same square he starts in? Two substrings are considered different if they have different starting or ending indices.", "input_spec": "The first line of the input contains a single positive integer, n (1\u2009\u2264\u2009n\u2009\u2264\u2009200)\u00a0\u2014 the number of commands. The next line contains n characters, each either 'U', 'R', 'D', or 'L'\u00a0\u2014 Calvin's source code.", "output_spec": "Print a single integer\u00a0\u2014 the number of contiguous substrings that Calvin can execute and return to his starting square.", "sample_inputs": ["6\nURLLDR", "4\nDLUU", "7\nRLRLRLR"], "sample_outputs": ["2", "0", "12"], "notes": "NoteIn the first case, the entire source code works, as well as the \"RL\" substring in the second and third characters.Note that, in the third case, the substring \"LR\" appears three times, and is therefore counted three times to the total result."}, "src_uid": "7bd5521531950e2de9a7b0904353184d"}
{"nl": {"description": "The protection of a popular program developed by one of IT City companies is organized the following way. After installation it outputs a random five digit number which should be sent in SMS to a particular phone number. In response an SMS activation code arrives.A young hacker Vasya disassembled the program and found the algorithm that transforms the shown number into the activation code. Note: it is clear that Vasya is a law-abiding hacker, and made it for a noble purpose \u2014 to show the developer the imperfection of their protection.The found algorithm looks the following way. At first the digits of the number are shuffled in the following order <first digit><third digit><fifth digit><fourth digit><second digit>. For example the shuffle of 12345 should lead to 13542. On the second stage the number is raised to the fifth power. The result of the shuffle and exponentiation of the number 12345 is 455\u00a0422\u00a0043\u00a0125\u00a0550\u00a0171\u00a0232. The answer is the 5 last digits of this result. For the number 12345 the answer should be 71232.Vasya is going to write a keygen program implementing this algorithm. Can you do the same?", "input_spec": "The only line of the input contains a positive integer five digit number for which the activation code should be found.", "output_spec": "Output exactly 5 digits without spaces between them \u2014 the found activation code of the program.", "sample_inputs": ["12345"], "sample_outputs": ["71232"], "notes": null}, "src_uid": "51b1c216948663fff721c28d131bf18f"}
{"nl": {"description": "Given the number n, find the smallest positive integer which has exactly n divisors. It is guaranteed that for the given n the answer will not exceed 1018.", "input_spec": "The first line of the input contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091000).", "output_spec": "Output the smallest positive integer with exactly n divisors.", "sample_inputs": ["4", "6"], "sample_outputs": ["6", "12"], "notes": null}, "src_uid": "62db589bad3b7023418107de05b7a8ee"}
{"nl": {"description": " \u2014 Thanks a lot for today.\u2014 I experienced so many great things.\u2014 You gave me memories like dreams... But I have to leave now...\u2014 One last request, can you...\u2014 Help me solve a Codeforces problem?\u2014 ......\u2014 What?Chtholly has been thinking about a problem for days:If a number is palindrome and length of its decimal representation without leading zeros is even, we call it a zcy number. A number is palindrome means when written in decimal representation, it contains no leading zeros and reads the same forwards and backwards. For example 12321 and 1221 are palindromes and 123 and 12451 are not. Moreover, 1221 is zcy number and 12321 is not.Given integers k and p, calculate the sum of the k smallest zcy numbers and output this sum modulo p.Unfortunately, Willem isn't good at solving this kind of problems, so he asks you for help!", "input_spec": "The first line contains two integers k and p (1\u2009\u2264\u2009k\u2009\u2264\u2009105,\u20091\u2009\u2264\u2009p\u2009\u2264\u2009109).", "output_spec": "Output single integer\u00a0\u2014 answer to the problem.", "sample_inputs": ["2 100", "5 30"], "sample_outputs": ["33", "15"], "notes": "NoteIn the first example, the smallest zcy number is 11, and the second smallest zcy number is 22.In the second example, ."}, "src_uid": "00e90909a77ce9e22bb7cbf1285b0609"}
{"nl": {"description": "Nicholas has an array a that contains n distinct integers from 1 to n. In other words, Nicholas has a permutation of size n.Nicholas want the minimum element (integer 1) and the maximum element (integer n) to be as far as possible from each other. He wants to perform exactly one swap in order to maximize the distance between the minimum and the maximum elements. The distance between two elements is considered to be equal to the absolute difference between their positions.", "input_spec": "The first line of the input contains a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the size of the permutation. The second line of the input contains n distinct integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009n), where ai is equal to the element at the i-th position.", "output_spec": "Print a single integer\u00a0\u2014 the maximum possible distance between the minimum and the maximum elements Nicholas can achieve by performing exactly one swap.", "sample_inputs": ["5\n4 5 1 3 2", "7\n1 6 5 3 4 7 2", "6\n6 5 4 3 2 1"], "sample_outputs": ["3", "6", "5"], "notes": "NoteIn the first sample, one may obtain the optimal answer by swapping elements 1 and 2.In the second sample, the minimum and the maximum elements will be located in the opposite ends of the array if we swap 7 and 2.In the third sample, the distance between the minimum and the maximum elements is already maximum possible, so we just perform some unnecessary swap, for example, one can swap 5 and 2."}, "src_uid": "1d2b81ce842f8c97656d96bddff4e8b4"}
{"nl": {"description": "At a geometry lesson Bob learnt that a triangle is called right-angled if it is nondegenerate and one of its angles is right. Bob decided to draw such a triangle immediately: on a sheet of paper he drew three points with integer coordinates, and joined them with segments of straight lines, then he showed the triangle to Peter. Peter said that Bob's triangle is not right-angled, but is almost right-angled: the triangle itself is not right-angled, but it is possible to move one of the points exactly by distance 1 so, that all the coordinates remain integer, and the triangle become right-angled. Bob asks you to help him and find out if Peter tricks him. By the given coordinates of the triangle you should find out if it is right-angled, almost right-angled, or neither of these.", "input_spec": "The first input line contains 6 space-separated integers x1,\u2009y1,\u2009x2,\u2009y2,\u2009x3,\u2009y3 \u2014 coordinates of the triangle's vertices. All the coordinates are integer and don't exceed 100 in absolute value. It's guaranteed that the triangle is nondegenerate, i.e. its total area is not zero.", "output_spec": "If the given triangle is right-angled, output RIGHT, if it is almost right-angled, output ALMOST, and if it is neither of these, output NEITHER.", "sample_inputs": ["0 0 2 0 0 1", "2 3 4 5 6 6", "-1 0 2 0 0 1"], "sample_outputs": ["RIGHT", "NEITHER", "ALMOST"], "notes": null}, "src_uid": "8324fa542297c21bda1a4aed0bd45a2d"}
{"nl": {"description": "One very experienced problem writer decided to prepare a problem for April Fools Day contest. The task was very simple - given an arithmetic expression, return the result of evaluating this expression. However, looks like there is a bug in the reference solution...", "input_spec": "The only line of input data contains the arithmetic expression. The expression will contain between 2 and 10 operands, separated with arithmetic signs plus and/or minus. Each operand will be an integer between 0 and 255, inclusive.", "output_spec": "Reproduce the output of the reference solution, including the bug.", "sample_inputs": ["8-7+6-5+4-3+2-1-0", "2+2", "112-37"], "sample_outputs": ["4", "-46", "375"], "notes": null}, "src_uid": "db85fa18f00e560b58cfa7bab2fa957d"}
{"nl": {"description": "Paul is at the orchestra. The string section is arranged in an r\u2009\u00d7\u2009c rectangular grid and is filled with violinists with the exception of n violists. Paul really likes violas, so he would like to take a picture including at least k of them. Paul can take a picture of any axis-parallel rectangle in the orchestra. Count the number of possible pictures that Paul can take.Two pictures are considered to be different if the coordinates of corresponding rectangles are different.", "input_spec": "The first line of input contains four space-separated integers r, c, n, k (1\u2009\u2264\u2009r,\u2009c,\u2009n\u2009\u2264\u20093000, 1\u2009\u2264\u2009k\u2009\u2264\u2009min(n,\u200910))\u00a0\u2014 the number of rows and columns of the string section, the total number of violas, and the minimum number of violas Paul would like in his photograph, respectively. The next n lines each contain two integers xi and yi (1\u2009\u2264\u2009xi\u2009\u2264\u2009r, 1\u2009\u2264\u2009yi\u2009\u2264\u2009c): the position of the i-th viola. It is guaranteed that no location appears more than once in the input.", "output_spec": "Print a single integer\u00a0\u2014 the number of photographs Paul can take which include at least k violas. ", "sample_inputs": ["2 2 1 1\n1 2", "3 2 3 3\n1 1\n3 1\n2 2", "3 2 3 2\n1 1\n3 1\n2 2"], "sample_outputs": ["4", "1", "4"], "notes": "NoteWe will use '*' to denote violinists and '#' to denote violists.In the first sample, the orchestra looks as follows: *#** Paul can take a photograph of just the viola, the 1\u2009\u00d7\u20092 column containing the viola, the 2\u2009\u00d7\u20091 row containing the viola, or the entire string section, for 4 pictures total.In the second sample, the orchestra looks as follows: #**##* Paul must take a photograph of the entire section.In the third sample, the orchestra looks the same as in the second sample."}, "src_uid": "9c766881f6415e2f53fb43b61f8f40b4"}
{"nl": {"description": "Nearly each project of the F company has a whole team of developers working on it. They often are in different rooms of the office in different cities and even countries. To keep in touch and track the results of the project, the F company conducts shared online meetings in a Spyke chat.One day the director of the F company got hold of the records of a part of an online meeting of one successful team. The director watched the record and wanted to talk to the team leader. But how can he tell who the leader is? The director logically supposed that the leader is the person who is present at any conversation during a chat meeting. In other words, if at some moment of time at least one person is present on the meeting, then the leader is present on the meeting.You are the assistant director. Given the 'user logged on'/'user logged off' messages of the meeting in the chronological order, help the director determine who can be the leader. Note that the director has the record of only a continuous part of the meeting (probably, it's not the whole meeting).", "input_spec": "The first line contains integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009105) \u2014 the number of team participants and the number of messages. Each of the next m lines contains a message in the format:   '+ id': the record means that the person with number id (1\u2009\u2264\u2009id\u2009\u2264\u2009n) has logged on to the meeting.  '- id': the record means that the person with number id (1\u2009\u2264\u2009id\u2009\u2264\u2009n) has logged off from the meeting.  Assume that all the people of the team are numbered from 1 to n and the messages are given in the chronological order. It is guaranteed that the given sequence is the correct record of a continuous part of the meeting. It is guaranteed that no two log on/log off events occurred simultaneously.", "output_spec": "In the first line print integer k (0\u2009\u2264\u2009k\u2009\u2264\u2009n) \u2014 how many people can be leaders. In the next line, print k integers in the increasing order \u2014 the numbers of the people who can be leaders. If the data is such that no member of the team can be a leader, print a single number 0.", "sample_inputs": ["5 4\n+ 1\n+ 2\n- 2\n- 1", "3 2\n+ 1\n- 2", "2 4\n+ 1\n- 1\n+ 2\n- 2", "5 6\n+ 1\n- 1\n- 3\n+ 3\n+ 4\n- 4", "2 4\n+ 1\n- 2\n+ 2\n- 1"], "sample_outputs": ["4\n1 3 4 5", "1\n3", "0", "3\n2 3 5", "0"], "notes": null}, "src_uid": "a3a337c7b919e7dfd7ff45ebf59681b5"}
{"nl": {"description": "Dima and his friends have been playing hide and seek at Dima's place all night. As a result, Dima's place got messy. In the morning they decided that they need to clean the place.To decide who exactly would clean the apartment, the friends want to play a counting-out game. First, all the guys stand in a circle, and then each of them shows some number of fingers on one hand (one to five), and then the boys count in a circle, starting from Dima, the number of people, respective to the total number of fingers shown. The person on who the countdown stops will clean the apartment.For example, if Dima and one of his friends played hide and seek, and 7 fingers were shown during the counting-out, then Dima would clean the place. If there were 2 or say, 8 fingers shown, then his friend would clean the place.Dima knows how many fingers each of his friends will show during the counting-out. Now he is interested in the number of ways to show some number of fingers on one hand (one to five), so that he did not have to clean the place. Help Dima.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of Dima's friends. Dima himself isn't considered to be his own friend. The second line contains n positive integers, not exceeding 5, representing, how many fingers the Dima's friends will show.  The numbers in the lines are separated by a single space.", "output_spec": "In a single line print the answer to the problem.", "sample_inputs": ["1\n1", "1\n2", "2\n3 5"], "sample_outputs": ["3", "2", "3"], "notes": "NoteIn the first sample Dima can show 1, 3 or 5 fingers. If Dima shows 3 fingers, then the counting-out will go like that: Dima, his friend, Dima, his friend.In the second sample Dima can show 2 or 4 fingers."}, "src_uid": "ff6b3fd358c758324c19a26283ab96a4"}
{"nl": {"description": "You are given a string q. A sequence of k strings s1,\u2009s2,\u2009...,\u2009sk is called beautiful, if the concatenation of these strings is string q (formally, s1\u2009+\u2009s2\u2009+\u2009...\u2009+\u2009sk\u2009=\u2009q) and the first characters of these strings are distinct.Find any beautiful sequence of strings or determine that the beautiful sequence doesn't exist.", "input_spec": "The first line contains a positive integer k (1\u2009\u2264\u2009k\u2009\u2264\u200926) \u2014 the number of strings that should be in a beautiful sequence.  The second line contains string q, consisting of lowercase Latin letters. The length of the string is within range from 1 to 100, inclusive.", "output_spec": "If such sequence doesn't exist, then print in a single line \"NO\" (without the quotes). Otherwise, print in the first line \"YES\" (without the quotes) and in the next k lines print the beautiful sequence of strings s1,\u2009s2,\u2009...,\u2009sk. If there are multiple possible answers, print any of them.", "sample_inputs": ["1\nabca", "2\naaacas", "4\nabc"], "sample_outputs": ["YES\nabca", "YES\naaa\ncas", "NO"], "notes": "NoteIn the second sample there are two possible answers: {\"aaaca\",\u2009\"s\"} and {\"aaa\",\u2009\"cas\"}."}, "src_uid": "c1b071f09ef375f19031ce99d10e90ab"}
{"nl": {"description": "Petya studies at university. The current academic year finishes with $$$n$$$ special days. Petya needs to pass $$$m$$$ exams in those special days. The special days in this problem are numbered from $$$1$$$ to $$$n$$$.There are three values about each exam:  $$$s_i$$$ \u2014 the day, when questions for the $$$i$$$-th exam will be published,  $$$d_i$$$ \u2014 the day of the $$$i$$$-th exam ($$$s_i < d_i$$$),  $$$c_i$$$ \u2014 number of days Petya needs to prepare for the $$$i$$$-th exam. For the $$$i$$$-th exam Petya should prepare in days between $$$s_i$$$ and $$$d_i-1$$$, inclusive. There are three types of activities for Petya in each day: to spend a day doing nothing (taking a rest), to spend a day passing exactly one exam or to spend a day preparing for exactly one exam. So he can't pass/prepare for multiple exams in a day. He can't mix his activities in a day. If he is preparing for the $$$i$$$-th exam in day $$$j$$$, then $$$s_i \\le j < d_i$$$.It is allowed to have breaks in a preparation to an exam and to alternate preparations for different exams in consecutive days. So preparation for an exam is not required to be done in consecutive days.Find the schedule for Petya to prepare for all exams and pass them, or report that it is impossible.", "input_spec": "The first line contains two integers $$$n$$$ and $$$m$$$ $$$(2 \\le n \\le 100, 1 \\le m \\le n)$$$ \u2014 the number of days and the number of exams. Each of the following $$$m$$$ lines contains three integers $$$s_i$$$, $$$d_i$$$, $$$c_i$$$ $$$(1 \\le s_i < d_i \\le n, 1 \\le c_i \\le n)$$$ \u2014 the day, when questions for the $$$i$$$-th exam will be given, the day of the $$$i$$$-th exam, number of days Petya needs to prepare for the $$$i$$$-th exam.  Guaranteed, that all the exams will be in different days. Questions for different exams can be given in the same day. It is possible that, in the day of some exam, the questions for other exams are given.", "output_spec": "If Petya can not prepare and pass all the exams, print -1. In case of positive answer, print $$$n$$$ integers, where the $$$j$$$-th number is:   $$$(m + 1)$$$, if the $$$j$$$-th day is a day of some exam (recall that in each day no more than one exam is conducted),  zero, if in the $$$j$$$-th day Petya will have a rest,  $$$i$$$ ($$$1 \\le i \\le m$$$), if Petya will prepare for the $$$i$$$-th exam in the day $$$j$$$ (the total number of days Petya prepares for each exam should be strictly equal to the number of days needed to prepare for it).Assume that the exams are numbered in order of appearing in the input, starting from $$$1$$$.If there are multiple schedules, print any of them.", "sample_inputs": ["5 2\n1 3 1\n1 5 1", "3 2\n1 3 1\n1 2 1", "10 3\n4 7 2\n1 10 3\n8 9 1"], "sample_outputs": ["1 2 3 0 3", "-1", "2 2 2 1 1 0 4 3 4 4"], "notes": "NoteIn the first example Petya can, for example, prepare for exam $$$1$$$ in the first day, prepare for exam $$$2$$$ in the second day, pass exam $$$1$$$ in the third day, relax in the fourth day, and pass exam $$$2$$$ in the fifth day. So, he can prepare and pass all exams.In the second example, there are three days and two exams. So, Petya can prepare in only one day (because in two other days he should pass exams). Then Petya can not prepare and pass all exams."}, "src_uid": "02d8d403eb60ae77756ff96f71b662d3"}
{"nl": {"description": "Apart from having lots of holidays throughout the year, residents of Berland also have whole lucky years. Year is considered lucky if it has no more than 1 non-zero digit in its number. So years 100, 40000, 5 are lucky and 12, 3001 and 12345 are not.You are given current year in Berland. Your task is to find how long will residents of Berland wait till the next lucky year.", "input_spec": "The first line contains integer number n (1\u2009\u2264\u2009n\u2009\u2264\u2009109) \u2014 current year in Berland.", "output_spec": "Output amount of years from the current year to the next lucky one.", "sample_inputs": ["4", "201", "4000"], "sample_outputs": ["1", "99", "1000"], "notes": "NoteIn the first example next lucky year is 5. In the second one \u2014 300. In the third \u2014 5000."}, "src_uid": "a3e15c0632e240a0ef6fe43a5ab3cc3e"}
{"nl": {"description": "You are given a sequence $$$a_1, a_2, \\dots, a_n$$$ consisting of $$$n$$$ integers.You can choose any non-negative integer $$$D$$$ (i.e. $$$D \\ge 0$$$), and for each $$$a_i$$$ you can:  add $$$D$$$ (only once), i.\u2009e. perform $$$a_i := a_i + D$$$, or  subtract $$$D$$$ (only once), i.\u2009e. perform $$$a_i := a_i - D$$$, or  leave the value of $$$a_i$$$ unchanged. It is possible that after an operation the value $$$a_i$$$ becomes negative.Your goal is to choose such minimum non-negative integer $$$D$$$ and perform changes in such a way, that all $$$a_i$$$ are equal (i.e. $$$a_1=a_2=\\dots=a_n$$$).Print the required $$$D$$$ or, if it is impossible to choose such value $$$D$$$, print -1.For example, for array $$$[2, 8]$$$ the value $$$D=3$$$ is minimum possible because you can obtain the array $$$[5, 5]$$$ if you will add $$$D$$$ to $$$2$$$ and subtract $$$D$$$ from $$$8$$$. And for array $$$[1, 4, 7, 7]$$$ the value $$$D=3$$$ is also minimum possible. You can add it to $$$1$$$ and subtract it from $$$7$$$ and obtain the array $$$[4, 4, 4, 4]$$$.", "input_spec": "The first line of the input contains one integer $$$n$$$ ($$$1 \\le n \\le 100$$$) \u2014 the number of elements in $$$a$$$. The second line of the input contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 100$$$) \u2014 the sequence $$$a$$$.", "output_spec": "Print one integer \u2014 the minimum non-negative integer value $$$D$$$ such that if you add this value to some $$$a_i$$$, subtract this value from some $$$a_i$$$ and leave some $$$a_i$$$ without changes, all obtained values become equal. If it is impossible to choose such value $$$D$$$, print -1.", "sample_inputs": ["6\n1 4 4 7 4 1", "5\n2 2 5 2 5", "4\n1 3 3 7", "2\n2 8"], "sample_outputs": ["3", "3", "-1", "3"], "notes": null}, "src_uid": "d486a88939c132848a7efdf257b9b066"}
{"nl": {"description": "Petya is having a party soon, and he has decided to invite his $$$n$$$ friends.He wants to make invitations in the form of origami. For each invitation, he needs two red sheets, five green sheets, and eight blue sheets. The store sells an infinite number of notebooks of each color, but each notebook consists of only one color with $$$k$$$ sheets. That is, each notebook contains $$$k$$$ sheets of either red, green, or blue.Find the minimum number of notebooks that Petya needs to buy to invite all $$$n$$$ of his friends.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1\\leq n, k\\leq 10^8$$$)\u00a0\u2014 the number of Petya's friends and the number of sheets in each notebook respectively.", "output_spec": "Print one number\u00a0\u2014 the minimum number of notebooks that Petya needs to buy.", "sample_inputs": ["3 5", "15 6"], "sample_outputs": ["10", "38"], "notes": "NoteIn the first example, we need $$$2$$$ red notebooks, $$$3$$$ green notebooks, and $$$5$$$ blue notebooks.In the second example, we need $$$5$$$ red notebooks, $$$13$$$ green notebooks, and $$$20$$$ blue notebooks."}, "src_uid": "d259a3a5c38af34b2a15d61157cc0a39"}
{"nl": {"description": "You have two friends. You want to present each of them several positive integers. You want to present cnt1 numbers to the first friend and cnt2 numbers to the second friend. Moreover, you want all presented numbers to be distinct, that also means that no number should be presented to both friends.In addition, the first friend does not like the numbers that are divisible without remainder by prime number x. The second one does not like the numbers that are divisible without remainder by prime number y. Of course, you're not going to present your friends numbers they don't like.Your task is to find such minimum number v, that you can form presents using numbers from a set 1,\u20092,\u2009...,\u2009v. Of course you may choose not to present some numbers at all.A positive integer number greater than 1 is called prime if it has no positive divisors other than 1 and itself.", "input_spec": "The only line contains four positive integers cnt1, cnt2, x, y (1\u2009\u2264\u2009cnt1,\u2009cnt2\u2009<\u2009109; cnt1\u2009+\u2009cnt2\u2009\u2264\u2009109; 2\u2009\u2264\u2009x\u2009<\u2009y\u2009\u2264\u20093\u00b7104)\u00a0\u2014 the numbers that are described in the statement. It is guaranteed that numbers x, y are prime.", "output_spec": "Print a single integer \u2014 the answer to the problem.", "sample_inputs": ["3 1 2 3", "1 3 2 3"], "sample_outputs": ["5", "4"], "notes": "NoteIn the first sample you give the set of numbers {1,\u20093,\u20095} to the first friend and the set of numbers {2} to the second friend. Note that if you give set {1,\u20093,\u20095} to the first friend, then we cannot give any of the numbers 1, 3, 5 to the second friend. In the second sample you give the set of numbers {3} to the first friend, and the set of numbers {1,\u20092,\u20094} to the second friend. Thus, the answer to the problem is 4."}, "src_uid": "ff3c39b759a049580a6e96c66c904fdc"}
{"nl": {"description": "Gerald has a friend, Pollard. Pollard is interested in lucky tickets (ticket is a sequence of digits). At first he thought that a ticket is lucky if between some its digits we can add arithmetic signs and brackets so that the result obtained by the arithmetic expression was number 100. But he quickly analyzed all such tickets and moved on to a more general question. Now he explores k-lucky tickets.Pollard sais that a ticket is k-lucky if we can add arithmetic operation signs between its digits to the left or right of them (i.e., \"+\", \"-\", \"\u2009\u00d7\u2009\") and brackets so as to obtain the correct arithmetic expression whose value would equal k. For example, ticket \"224201016\" is 1000-lucky as (\u2009-\u20092\u2009-\u2009(2\u2009+\u20094))\u2009\u00d7\u2009(2\u2009+\u20090)\u2009+\u20091016\u2009=\u20091000.Pollard was so carried away by the lucky tickets that he signed up for a seminar on lucky tickets and, as far as Gerald knows, Pollard will attend it daily at 7 pm in some famous institute and will commute to it in the same tram for m days. In this tram tickets have eight digits. And Gerald wants to make a surprise for Pollard: each day Pollard will receive a tram k-lucky ticket. The conductor has already agreed to give Pollard certain tickets during all these m days and he only wants Gerald to tell him what kind of tickets to give out. In this regard, help Gerald pick exactly m distinct k-lucky tickets.", "input_spec": "The single line contains two integers k and m (0\u2009\u2264\u2009k\u2009\u2264\u2009104, 1\u2009\u2264\u2009m\u2009\u2264\u20093\u00b7105).", "output_spec": "Print m lines. Each line must contain exactly 8 digits \u2014 the k-winning ticket. The tickets may begin with 0, all tickets must be distinct. If there are more than m distinct k-lucky tickets, print any m of them. It is guaranteed that at least m distinct k-lucky tickets exist. The tickets can be printed in any order.", "sample_inputs": ["0 3", "7 4"], "sample_outputs": ["00000000\n00000001\n00000002", "00000007\n00000016\n00000017\n00000018"], "notes": null}, "src_uid": "4720ca1d2f4b7a0e553a3ea07a76943c"}
{"nl": {"description": "Tarly has two different type of items, food boxes and wine barrels. There are f food boxes and w wine barrels. Tarly stores them in various stacks and each stack can consist of either food boxes or wine barrels but not both. The stacks are placed in a line such that no two stacks of food boxes are together and no two stacks of wine barrels are together.The height of a stack is defined as the number of items in the stack. Two stacks are considered different if either their heights are different or one of them contains food and other contains wine.Jon Snow doesn't like an arrangement if any stack of wine barrels has height less than or equal to h. What is the probability that Jon Snow will like the arrangement if all arrangement are equiprobably?Two arrangement of stacks are considered different if exists such i, that i-th stack of one arrangement is different from the i-th stack of the other arrangement.", "input_spec": "The first line of input contains three integers f, w, h (0\u2009\u2264\u2009f,\u2009w,\u2009h\u2009\u2264\u2009105) \u2014 number of food boxes, number of wine barrels and h is as described above. It is guaranteed that he has at least one food box or at least one wine barrel.", "output_spec": "Output the probability that Jon Snow will like the arrangement. The probability is of the form , then you need to output a single integer p\u00b7q\u2009-\u20091 mod (109\u2009+\u20097).", "sample_inputs": ["1 1 1", "1 2 1"], "sample_outputs": ["0", "666666672"], "notes": "NoteIn the first example f\u2009\u2009=\u2009\u20091, w\u2009=\u20091 and h\u2009=\u20091, there are only two possible arrangement of stacks and Jon Snow doesn't like any of them.In the second example f\u2009=\u20091, w\u2009=\u20092 and h\u2009=\u20091, there are three arrangements. Jon Snow likes the (1) and (3) arrangement. So the probabilty is .  "}, "src_uid": "a69f95db3fe677111cf0558271b40f39"}
{"nl": {"description": "Ilya is an experienced player in tic-tac-toe on the 4\u2009\u00d7\u20094 field. He always starts and plays with Xs. He played a lot of games today with his friend Arseny. The friends became tired and didn't finish the last game. It was Ilya's turn in the game when they left it. Determine whether Ilya could have won the game by making single turn or not. The rules of tic-tac-toe on the 4\u2009\u00d7\u20094 field are as follows. Before the first turn all the field cells are empty. The two players take turns placing their signs into empty cells (the first player places Xs, the second player places Os). The player who places Xs goes first, the another one goes second. The winner is the player who first gets three of his signs in a row next to each other (horizontal, vertical or diagonal).", "input_spec": "The tic-tac-toe position is given in four lines. Each of these lines contains four characters. Each character is '.' (empty cell), 'x' (lowercase English letter x), or 'o' (lowercase English letter o). It is guaranteed that the position is reachable playing tic-tac-toe, and it is Ilya's turn now (in particular, it means that the game is not finished). It is possible that all the cells are empty, it means that the friends left without making single turn.", "output_spec": "Print single line: \"YES\" in case Ilya could have won by making single turn, and \"NO\" otherwise.", "sample_inputs": ["xx..\n.oo.\nx...\noox.", "x.ox\nox..\nx.o.\noo.x", "x..x\n..oo\no...\nx.xo", "o.x.\no...\n.x..\nooxx"], "sample_outputs": ["YES", "NO", "YES", "NO"], "notes": "NoteIn the first example Ilya had two winning moves: to the empty cell in the left column and to the leftmost empty cell in the first row.In the second example it wasn't possible to win by making single turn.In the third example Ilya could have won by placing X in the last row between two existing Xs.In the fourth example it wasn't possible to win by making single turn."}, "src_uid": "ca4a77fe9718b8bd0b3cc3d956e22917"}
{"nl": {"description": "Gennady owns a small hotel in the countryside where he lives a peaceful life. He loves to take long walks, watch sunsets and play cards with tourists staying in his hotel. His favorite game is called \"Mau-Mau\".To play Mau-Mau, you need a pack of $$$52$$$ cards. Each card has a suit (Diamonds \u2014 D, Clubs \u2014 C, Spades \u2014 S, or Hearts \u2014 H), and a rank (2, 3, 4, 5, 6, 7, 8, 9, T, J, Q, K, or A).At the start of the game, there is one card on the table and you have five cards in your hand. You can play a card from your hand if and only if it has the same rank or the same suit as the card on the table.In order to check if you'd be a good playing partner, Gennady has prepared a task for you. Given the card on the table and five cards in your hand, check if you can play at least one card.", "input_spec": "The first line of the input contains one string which describes the card on the table. The second line contains five strings which describe the cards in your hand. Each string is two characters long. The first character denotes the rank and belongs to the set $$$\\{{\\tt 2}, {\\tt 3}, {\\tt 4}, {\\tt 5}, {\\tt 6}, {\\tt 7}, {\\tt 8}, {\\tt 9}, {\\tt T}, {\\tt J}, {\\tt Q}, {\\tt K}, {\\tt A}\\}$$$. The second character denotes the suit and belongs to the set $$$\\{{\\tt D}, {\\tt C}, {\\tt S}, {\\tt H}\\}$$$. All the cards in the input are different.", "output_spec": "If it is possible to play a card from your hand, print one word \"YES\". Otherwise, print \"NO\". You can print each letter in any case (upper or lower).", "sample_inputs": ["AS\n2H 4C TH JH AD", "2H\n3D 4C AC KD AS", "4D\nAS AC AD AH 5H"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteIn the first example, there is an Ace of Spades (AS) on the table. You can play an Ace of Diamonds (AD) because both of them are Aces.In the second example, you cannot play any card.In the third example, you can play an Ace of Diamonds (AD) because it has the same suit as a Four of Diamonds (4D), which lies on the table."}, "src_uid": "699444eb6366ad12bc77e7ac2602d74b"}
{"nl": {"description": "There are n stones on the table in a row, each of them can be red, green or blue. Count the minimum number of stones to take from the table so that any two neighboring stones had different colors. Stones in a row are considered neighboring if there are no other stones between them.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950) \u2014 the number of stones on the table.  The next line contains string s, which represents the colors of the stones. We'll consider the stones in the row numbered from 1 to n from left to right. Then the i-th character s equals \"R\", if the i-th stone is red, \"G\", if it's green and \"B\", if it's blue.", "output_spec": "Print a single integer \u2014 the answer to the problem.", "sample_inputs": ["3\nRRG", "5\nRRRRR", "4\nBRBG"], "sample_outputs": ["1", "4", "0"], "notes": null}, "src_uid": "d561436e2ddc9074b98ebbe49b9e27b8"}
{"nl": {"description": "A mouse encountered a nice big cake and decided to take a walk across it, eating the berries on top of the cake on its way. The cake is rectangular, neatly divided into squares; some of the squares have a berry in them, and some don't.The mouse is in a bit of a hurry, though, so once she enters the cake from its northwest corner (the top left cell in the input data), she will only go east (right) or south (down), until she reaches the southeast corner (the bottom right cell). She will eat every berry in the squares she passes through, but not in the other squares.The mouse tries to choose her path so as to maximize the number of berries consumed. However, her haste and hunger might be clouding her judgement, leading her to suboptimal decisions...", "input_spec": "The first line of input contains two integers $$$H$$$ and $$$W$$$ ($$$1 \\le H, W \\le 5$$$), separated by a space, \u2014 the height and the width of the cake. The next $$$H$$$ lines contain a string of $$$W$$$ characters each, representing the squares of the cake in that row: '.' represents an empty square, and '*' represents a square with a berry.", "output_spec": "Output the number of berries the mouse will eat following her strategy.", "sample_inputs": ["4 3\n*..\n.*.\n..*\n...", "4 4\n.*..\n*...\n...*\n..*.", "3 4\n..**\n*...\n....", "5 5\n..*..\n.....\n**...\n**...\n**..."], "sample_outputs": ["3", "2", "1", "1"], "notes": null}, "src_uid": "f985d7a6e7650a9b855a4cef26fd9b0d"}
{"nl": {"description": "Alice has got addicted to a game called Sirtet recently.In Sirtet, player is given an $$$n \\times m$$$ grid. Initially $$$a_{i,j}$$$ cubes are stacked up in the cell $$$(i,j)$$$. Two cells are called adjacent if they share a side. Player can perform the following operations:   stack up one cube in two adjacent cells;  stack up two cubes in one cell. Cubes mentioned above are identical in height.Here is an illustration of the game. States on the right are obtained by performing one of the above operations on the state on the left, and grey cubes are added due to the operation.  Player's goal is to make the height of all cells the same (i.e. so that each cell has the same number of cubes in it) using above operations. Alice, however, has found out that on some starting grids she may never reach the goal no matter what strategy she uses. Thus, she is wondering the number of initial grids such that   $$$L \\le a_{i,j} \\le R$$$ for all $$$1 \\le i \\le n$$$, $$$1 \\le j \\le m$$$;  player can reach the goal using above operations. Please help Alice with it. Notice that the answer might be large, please output the desired value modulo $$$998,244,353$$$.", "input_spec": "The only line contains four integers $$$n$$$, $$$m$$$, $$$L$$$ and $$$R$$$ ($$$1\\le n,m,L,R \\le 10^9$$$, $$$L \\le R$$$, $$$n \\cdot m \\ge 2$$$).", "output_spec": "Output one integer, representing the desired answer modulo $$$998,244,353$$$.", "sample_inputs": ["2 2 1 1", "1 2 1 2"], "sample_outputs": ["1", "2"], "notes": "NoteIn the first sample, the only initial grid that satisfies the requirements is $$$a_{1,1}=a_{2,1}=a_{1,2}=a_{2,2}=1$$$. Thus the answer should be $$$1$$$.In the second sample, initial grids that satisfy the requirements are $$$a_{1,1}=a_{1,2}=1$$$ and $$$a_{1,1}=a_{1,2}=2$$$. Thus the answer should be $$$2$$$."}, "src_uid": "ded299fa1cd010822c60f2389a3ba1a3"}
{"nl": {"description": "Bob is decorating his kitchen, more precisely, the floor. He has found a prime candidate for the tiles he will use. They come in a simple form factor\u00a0\u2014\u00a0a square tile that is diagonally split into white and black part as depicted in the figure below.  The dimension of this tile is perfect for this kitchen, as he will need exactly $$$w \\times h$$$ tiles without any scraps. That is, the width of the kitchen is $$$w$$$ tiles, and the height is $$$h$$$ tiles. As each tile can be rotated in one of four ways, he still needs to decide on how exactly he will tile the floor. There is a single aesthetic criterion that he wants to fulfil: two adjacent tiles must not share a colour on the edge\u00a0\u2014\u00a0i.e. one of the tiles must have a white colour on the shared border, and the second one must be black.    The picture on the left shows one valid tiling of a $$$3 \\times 2$$$ kitchen. The picture on the right shows an invalid arrangement, as the bottom two tiles touch with their white parts. Find the number of possible tilings. As this number may be large, output its remainder when divided by $$$998244353$$$ (a prime number). ", "input_spec": "The only line contains two space separated integers $$$w$$$, $$$h$$$\u00a0($$$1 \\leq w,h \\leq 1\\,000$$$)\u00a0\u2014\u00a0the width and height of the kitchen, measured in tiles.", "output_spec": "Output a single integer $$$n$$$\u00a0\u2014\u00a0the remainder of the number of tilings when divided by $$$998244353$$$.", "sample_inputs": ["2 2", "2 4"], "sample_outputs": ["16", "64"], "notes": null}, "src_uid": "8b2a9ae21740c89079a6011a30cd6aee"}
{"nl": {"description": "Let's define a split of $$$n$$$ as a nonincreasing sequence of positive integers, the sum of which is $$$n$$$. For example, the following sequences are splits of $$$8$$$: $$$[4, 4]$$$, $$$[3, 3, 2]$$$, $$$[2, 2, 1, 1, 1, 1]$$$, $$$[5, 2, 1]$$$.The following sequences aren't splits of $$$8$$$: $$$[1, 7]$$$, $$$[5, 4]$$$, $$$[11, -3]$$$, $$$[1, 1, 4, 1, 1]$$$.The weight of a split is the number of elements in the split that are equal to the first element. For example, the weight of the split $$$[1, 1, 1, 1, 1]$$$ is $$$5$$$, the weight of the split $$$[5, 5, 3, 3, 3]$$$ is $$$2$$$ and the weight of the split $$$[9]$$$ equals $$$1$$$.For a given $$$n$$$, find out the number of different weights of its splits.", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\leq n \\leq 10^9$$$).", "output_spec": "Output one integer\u00a0\u2014 the answer to the problem.", "sample_inputs": ["7", "8", "9"], "sample_outputs": ["4", "5", "5"], "notes": "NoteIn the first sample, there are following possible weights of splits of $$$7$$$:Weight 1: [$$$\\textbf 7$$$] Weight 2: [$$$\\textbf 3$$$, $$$\\textbf 3$$$, 1] Weight 3: [$$$\\textbf 2$$$, $$$\\textbf 2$$$, $$$\\textbf 2$$$, 1] Weight 7: [$$$\\textbf 1$$$, $$$\\textbf 1$$$, $$$\\textbf 1$$$, $$$\\textbf 1$$$, $$$\\textbf 1$$$, $$$\\textbf 1$$$, $$$\\textbf 1$$$]"}, "src_uid": "5551742f6ab39fdac3930d866f439e3e"}
{"nl": {"description": "Kostya likes Codeforces contests very much. However, he is very disappointed that his solutions are frequently hacked. That's why he decided to obfuscate (intentionally make less readable) his code before upcoming contest.To obfuscate the code, Kostya first looks at the first variable name used in his program and replaces all its occurrences with a single symbol a, then he looks at the second variable name that has not been replaced yet, and replaces all its occurrences with b, and so on. Kostya is well-mannered, so he doesn't use any one-letter names before obfuscation. Moreover, there are at most 26 unique identifiers in his programs.You are given a list of identifiers of some program with removed spaces and line breaks. Check if this program can be a result of Kostya's obfuscation.", "input_spec": "In the only line of input there is a string S of lowercase English letters (1\u2009\u2264\u2009|S|\u2009\u2264\u2009500)\u00a0\u2014 the identifiers of a program with removed whitespace characters.", "output_spec": "If this program can be a result of Kostya's obfuscation, print \"YES\" (without quotes), otherwise print \"NO\".", "sample_inputs": ["abacaba", "jinotega"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first sample case, one possible list of identifiers would be \"number string number character number string number\". Here how Kostya would obfuscate the program: replace all occurences of number with a, the result would be \"a string a character a string a\", replace all occurences of string with b, the result would be \"a b a character a b a\", replace all occurences of character with c, the result would be \"a b a c a b a\", all identifiers have been replaced, thus the obfuscation is finished."}, "src_uid": "c4551f66a781b174f95865fa254ca972"}
{"nl": {"description": "Polycarp loves ciphers. He has invented his own cipher called Right-Left.Right-Left cipher is used for strings. To encrypt the string $$$s=s_{1}s_{2} \\dots s_{n}$$$ Polycarp uses the following algorithm:  he writes down $$$s_1$$$,  he appends the current word with $$$s_2$$$ (i.e. writes down $$$s_2$$$ to the right of the current result),  he prepends the current word with $$$s_3$$$ (i.e. writes down $$$s_3$$$ to the left of the current result),  he appends the current word with $$$s_4$$$ (i.e. writes down $$$s_4$$$ to the right of the current result),  he prepends the current word with $$$s_5$$$ (i.e. writes down $$$s_5$$$ to the left of the current result),  and so on for each position until the end of $$$s$$$. For example, if $$$s$$$=\"techno\" the process is: \"t\" $$$\\to$$$ \"te\" $$$\\to$$$ \"cte\" $$$\\to$$$ \"cteh\" $$$\\to$$$ \"ncteh\" $$$\\to$$$ \"ncteho\". So the encrypted $$$s$$$=\"techno\" is \"ncteho\".Given string $$$t$$$ \u2014 the result of encryption of some string $$$s$$$. Your task is to decrypt it, i.e. find the string $$$s$$$.", "input_spec": "The only line of the input contains $$$t$$$ \u2014 the result of encryption of some string $$$s$$$. It contains only lowercase Latin letters. The length of $$$t$$$ is between $$$1$$$ and $$$50$$$, inclusive.", "output_spec": "Print such string $$$s$$$ that after encryption it equals $$$t$$$.", "sample_inputs": ["ncteho", "erfdcoeocs", "z"], "sample_outputs": ["techno", "codeforces", "z"], "notes": null}, "src_uid": "992ae43e66f1808f19c86b1def1f6b41"}
{"nl": {"description": "You can't possibly imagine how cold our friends are this winter in Nvodsk! Two of them play the following game to warm up: initially a piece of paper has an integer q. During a move a player should write any integer number that is a non-trivial divisor of the last written number. Then he should run this number of circles around the hotel. Let us remind you that a number's divisor is called non-trivial if it is different from one and from the divided number itself. The first person who can't make a move wins as he continues to lie in his warm bed under three blankets while the other one keeps running. Determine which player wins considering that both players play optimally. If the first player wins, print any winning first move.", "input_spec": "The first line contains the only integer q (1\u2009\u2264\u2009q\u2009\u2264\u20091013). Please do not use the %lld specificator to read or write 64-bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specificator.", "output_spec": "In the first line print the number of the winning player (1 or 2). If the first player wins then the second line should contain another integer \u2014 his first move (if the first player can't even make the first move, print 0). If there are multiple solutions, print any of them.", "sample_inputs": ["6", "30", "1"], "sample_outputs": ["2", "1\n6", "1\n0"], "notes": "NoteNumber 6 has only two non-trivial divisors: 2 and 3. It is impossible to make a move after the numbers 2 and 3 are written, so both of them are winning, thus, number 6 is the losing number. A player can make a move and write number 6 after number 30; 6, as we know, is a losing number. Thus, this move will bring us the victory."}, "src_uid": "f0a138b9f6ad979c5ca32437e05d6f43"}
{"nl": {"description": "Malek lives in an apartment block with 100 floors numbered from 0 to 99. The apartment has an elevator with a digital counter showing the floor that the elevator is currently on. The elevator shows each digit of a number with 7 light sticks by turning them on or off. The picture below shows how the elevator shows each digit.One day when Malek wanted to go from floor 88 to floor 0 using the elevator he noticed that the counter shows number 89 instead of 88. Then when the elevator started moving the number on the counter changed to 87. After a little thinking Malek came to the conclusion that there is only one explanation for this: One of the sticks of the counter was broken. Later that day Malek was thinking about the broken stick and suddenly he came up with the following problem.Suppose the digital counter is showing number n. Malek calls an integer x (0\u2009\u2264\u2009x\u2009\u2264\u200999) good if it's possible that the digital counter was supposed to show x but because of some(possibly none) broken sticks it's showing n instead. Malek wants to know number of good integers for a specific n. So you must write a program that calculates this number. Please note that the counter always shows two digits.", "input_spec": "The only line of input contains exactly two digits representing number n (0\u2009\u2264\u2009n\u2009\u2264\u200999). Note that n may have a leading zero.", "output_spec": "In the only line of the output print the number of good integers.", "sample_inputs": ["89", "00", "73"], "sample_outputs": ["2", "4", "15"], "notes": "NoteIn the first sample the counter may be supposed to show 88 or 89.In the second sample the good integers are 00, 08, 80 and 88.In the third sample the good integers are 03,\u200908,\u200909,\u200933,\u200938,\u200939,\u200973,\u200978,\u200979,\u200983,\u200988,\u200989,\u200993,\u200998,\u200999."}, "src_uid": "76c8bfa6789db8364a8ece0574cd31f5"}
{"nl": {"description": "Arkadiy has lots square photos with size a\u2009\u00d7\u2009a. He wants to put some of them on a rectangular wall with size h\u2009\u00d7\u2009w. The photos which Arkadiy will put on the wall must form a rectangular grid and the distances between neighboring vertically and horizontally photos and also the distances between outside rows and columns of photos to the nearest bound of the wall must be equal to x, where x is some non-negative real number. Look on the picture below for better understanding of the statement.  Arkadiy haven't chosen yet how many photos he would put on the wall, however, he want to put at least one photo. Your task is to determine the minimum value of x which can be obtained after putting photos, or report that there is no way to put positive number of photos and satisfy all the constraints. Suppose that Arkadiy has enough photos to make any valid arrangement according to the constraints.Note that Arkadiy wants to put at least one photo on the wall. The photos should not overlap, should completely lie inside the wall bounds and should have sides parallel to the wall sides.", "input_spec": "The first line contains three integers a, h and w (1\u2009\u2264\u2009a,\u2009h,\u2009w\u2009\u2264\u2009109) \u2014 the size of photos and the height and the width of the wall.", "output_spec": "Print one non-negative real number \u2014 the minimum value of x which can be obtained after putting the photos on the wall. The absolute or the relative error of the answer must not exceed 10\u2009-\u20096. Print -1 if there is no way to put positive number of photos and satisfy the constraints.", "sample_inputs": ["2 18 13", "4 4 4", "3 4 3"], "sample_outputs": ["0.5", "0", "-1"], "notes": "NoteIn the first example Arkadiy can put 7 rows of photos with 5 photos in each row, so the minimum value of x equals to 0.5.In the second example Arkadiy can put only 1 photo which will take the whole wall, so the minimum value of x equals to 0.In the third example there is no way to put positive number of photos and satisfy the constraints described in the statement, so the answer is -1."}, "src_uid": "7fbefd3eb1aad6865adcfac394f0a7e6"}
{"nl": {"description": "Manao is trying to open a rather challenging lock. The lock has n buttons on it and to open it, you should press the buttons in a certain order to open the lock. When you push some button, it either stays pressed into the lock (that means that you've guessed correctly and pushed the button that goes next in the sequence), or all pressed buttons return to the initial position. When all buttons are pressed into the lock at once, the lock opens.Consider an example with three buttons. Let's say that the opening sequence is: {2, 3, 1}. If you first press buttons 1 or 3, the buttons unpress immediately. If you first press button 2, it stays pressed. If you press 1 after 2, all buttons unpress. If you press 3 after 2, buttons 3 and 2 stay pressed. As soon as you've got two pressed buttons, you only need to press button 1 to open the lock.Manao doesn't know the opening sequence. But he is really smart and he is going to act in the optimal way. Calculate the number of times he's got to push a button in order to open the lock in the worst-case scenario.", "input_spec": "A single line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u20092000) \u2014 the number of buttons the lock has.", "output_spec": "In a single line print the number of times Manao has to push a button in the worst-case scenario.", "sample_inputs": ["2", "3"], "sample_outputs": ["3", "7"], "notes": "NoteConsider the first test sample. Manao can fail his first push and push the wrong button. In this case he will already be able to guess the right one with his second push. And his third push will push the second right button. Thus, in the worst-case scenario he will only need 3 pushes."}, "src_uid": "6df251ac8bf27427a24bc23d64cb9884"}
{"nl": {"description": "In mathematics, the Pythagorean theorem \u2014 is a relation in Euclidean geometry among the three sides of a right-angled triangle. In terms of areas, it states: \u007fIn any right-angled triangle, the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares whose sides are the two legs (the two sides that meet at a right angle). The theorem can be written as an equation relating the lengths of the sides a, b and c, often called the Pythagorean equation:a2\u2009+\u2009b2\u2009=\u2009c2where c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides.  Given n, your task is to count how many right-angled triangles with side-lengths a, b and c that satisfied an inequality 1\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u2009c\u2009\u2264\u2009n.", "input_spec": "The only line contains one integer n\u00a0(1\u2009\u2264\u2009n\u2009\u2264\u2009104) as we mentioned above.", "output_spec": "Print a single integer \u2014 the answer to the problem.", "sample_inputs": ["5", "74"], "sample_outputs": ["1", "35"], "notes": null}, "src_uid": "36a211f7814e77339eb81dc132e115e1"}
{"nl": {"description": "On one of the planets of Solar system, in Atmosphere University, many students are fans of bingo game.It is well known that one month on this planet consists of $$$n^2$$$ days, so calendars, represented as square matrix $$$n$$$ by $$$n$$$ are extremely popular.Weather conditions are even more unusual. Due to the unique composition of the atmosphere, when interacting with sunlight, every day sky takes one of three colors: blue, green or red.To play the bingo, you need to observe the sky for one month\u00a0\u2014 after each day, its cell is painted with the color of the sky in that day, that is, blue, green or red.At the end of the month, students examine the calendar. If at least one row or column contains only cells of one color, that month is called lucky.Let's call two colorings of calendar different, if at least one cell has different colors in them. It is easy to see that there are $$$3^{n \\cdot n}$$$ different colorings. How much of them are lucky? Since this number can be quite large, print it modulo $$$998244353$$$.", "input_spec": "The first and only line of input contains a single integer $$$n$$$ ($$$1 \\le n \\le 1000\\,000$$$)\u00a0\u2014 the number of rows and columns in the calendar.", "output_spec": "Print one number\u00a0\u2014 number of lucky colorings of the calendar modulo $$$998244353$$$", "sample_inputs": ["1", "2", "3"], "sample_outputs": ["3", "63", "9933"], "notes": "NoteIn the first sample any coloring is lucky, since the only column contains cells of only one color.In the second sample, there are a lot of lucky colorings, in particular, the following colorings are lucky:  While these colorings are not lucky:  "}, "src_uid": "6e4b0ee2e1406041a961582ead299a3a"}
{"nl": {"description": "Let's introduce a number system which is based on a roman digits. There are digits I, V, X, L which correspond to the numbers $$$1$$$, $$$5$$$, $$$10$$$ and $$$50$$$ respectively. The use of other roman digits is not allowed.Numbers in this system are written as a sequence of one or more digits. We define the value of the sequence simply as the sum of digits in it.For example, the number XXXV evaluates to $$$35$$$ and the number IXI\u00a0\u2014 to $$$12$$$.Pay attention to the difference to the traditional roman system\u00a0\u2014 in our system any sequence of digits is valid, moreover the order of digits doesn't matter, for example IX means $$$11$$$, not $$$9$$$.One can notice that this system is ambiguous, and some numbers can be written in many different ways. Your goal is to determine how many distinct integers can be represented by exactly $$$n$$$ roman digits I, V, X, L.", "input_spec": "The only line of the input file contains a single integer $$$n$$$ ($$$1 \\le n \\le 10^9$$$)\u00a0\u2014 the number of roman digits to use.", "output_spec": "Output a single integer\u00a0\u2014 the number of distinct integers which can be represented using $$$n$$$ roman digits exactly.", "sample_inputs": ["1", "2", "10"], "sample_outputs": ["4", "10", "244"], "notes": "NoteIn the first sample there are exactly $$$4$$$ integers which can be represented\u00a0\u2014 I, V, X and L.In the second sample it is possible to represent integers $$$2$$$ (II), $$$6$$$ (VI), $$$10$$$ (VV), $$$11$$$ (XI), $$$15$$$ (XV), $$$20$$$ (XX), $$$51$$$ (IL), $$$55$$$ (VL), $$$60$$$ (XL) and $$$100$$$ (LL)."}, "src_uid": "75ec99318736a8a1b62a8d51efd95355"}
{"nl": {"description": "You are given an integer array $$$a_0, a_1, \\dots, a_{n - 1}$$$, and an integer $$$k$$$. You perform the following code with it:long long ans = 0; // create a 64-bit signed variable which is initially equal to 0for(int i = 1; i <= k; i++){  int idx = rnd.next(0, n - 1); // generate a random integer between 0 and n - 1, both inclusive                                // each integer from 0 to n - 1 has the same probability of being chosen  ans += a[idx];  a[idx] -= (a[idx] % i);}Your task is to calculate the expected value of the variable ans after performing this code.Note that the input is generated according to special rules (see the input format section).", "input_spec": "The only line contains six integers $$$n$$$, $$$a_0$$$, $$$x$$$, $$$y$$$, $$$k$$$ and $$$M$$$ ($$$1 \\le n \\le 10^7$$$; $$$1 \\le a_0, x, y < M \\le 998244353$$$; $$$1 \\le k \\le 17$$$). The array $$$a$$$ in the input is constructed as follows:   $$$a_0$$$ is given in the input;  for every $$$i$$$ from $$$1$$$ to $$$n - 1$$$, the value of $$$a_i$$$ can be calculated as $$$a_i = (a_{i - 1} \\cdot x + y) \\bmod M$$$. ", "output_spec": "Let the expected value of the variable ans after performing the code be $$$E$$$. It can be shown that $$$E \\cdot n^k$$$ is an integer. You have to output this integer modulo $$$998244353$$$.", "sample_inputs": ["3 10 3 5 13 88", "2 15363 270880 34698 17 2357023"], "sample_outputs": ["382842030", "319392398"], "notes": "NoteThe array in the first example test is $$$[10, 35, 22]$$$. In the second example, it is $$$[15363, 1418543]$$$."}, "src_uid": "1d45491e28d24e2b318605cd328d6ecf"}
{"nl": {"description": "There is a building consisting of $$$10~000$$$ apartments numbered from $$$1$$$ to $$$10~000$$$, inclusive.Call an apartment boring, if its number consists of the same digit. Examples of boring apartments are $$$11, 2, 777, 9999$$$ and so on.Our character is a troublemaker, and he calls the intercoms of all boring apartments, till someone answers the call, in the following order:  First he calls all apartments consisting of digit $$$1$$$, in increasing order ($$$1, 11, 111, 1111$$$).  Next he calls all apartments consisting of digit $$$2$$$, in increasing order ($$$2, 22, 222, 2222$$$)  And so on. The resident of the boring apartment $$$x$$$ answers the call, and our character stops calling anyone further.Our character wants to know how many digits he pressed in total and your task is to help him to count the total number of keypresses.For example, if the resident of boring apartment $$$22$$$ answered, then our character called apartments with numbers $$$1, 11, 111, 1111, 2, 22$$$ and the total number of digits he pressed is $$$1 + 2 + 3 + 4 + 1 + 2 = 13$$$.You have to answer $$$t$$$ independent test cases.", "input_spec": "The first line of the input contains one integer $$$t$$$ ($$$1 \\le t \\le 36$$$) \u2014 the number of test cases. The only line of the test case contains one integer $$$x$$$ ($$$1 \\le x \\le 9999$$$) \u2014 the apartment number of the resident who answered the call. It is guaranteed that $$$x$$$ consists of the same digit.", "output_spec": "For each test case, print the answer: how many digits our character pressed in total.", "sample_inputs": ["4\n22\n9999\n1\n777"], "sample_outputs": ["13\n90\n1\n66"], "notes": null}, "src_uid": "289a55128be89bb86a002d218d31b57f"}
{"nl": {"description": "Manao works on a sports TV. He's spent much time watching the football games of some country. After a while he began to notice different patterns. For example, each team has two sets of uniforms: home uniform and guest uniform. When a team plays a game at home, the players put on the home uniform. When a team plays as a guest on somebody else's stadium, the players put on the guest uniform. The only exception to that rule is: when the home uniform color of the host team matches the guests' uniform, the host team puts on its guest uniform as well. For each team the color of the home and guest uniform is different.There are n teams taking part in the national championship. The championship consists of n\u00b7(n\u2009-\u20091) games: each team invites each other team to its stadium. At this point Manao wondered: how many times during the championship is a host team going to put on the guest uniform? Note that the order of the games does not affect this number.You know the colors of the home and guest uniform for each team. For simplicity, the colors are numbered by integers in such a way that no two distinct colors have the same number. Help Manao find the answer to his question.", "input_spec": "The first line contains an integer n (2\u2009\u2264\u2009n\u2009\u2264\u200930). Each of the following n lines contains a pair of distinct space-separated integers hi, ai (1\u2009\u2264\u2009hi,\u2009ai\u2009\u2264\u2009100) \u2014 the colors of the i-th team's home and guest uniforms, respectively.", "output_spec": "In a single line print the number of games where the host team is going to play in the guest uniform.", "sample_inputs": ["3\n1 2\n2 4\n3 4", "4\n100 42\n42 100\n5 42\n100 5", "2\n1 2\n1 2"], "sample_outputs": ["1", "5", "0"], "notes": "NoteIn the first test case the championship consists of 6 games. The only game with the event in question is the game between teams 2 and 1 on the stadium of team 2.In the second test sample the host team will have to wear guest uniform in the games between teams: 1 and 2, 2 and 1, 2 and 3, 3 and 4, 4 and 2 (the host team is written first)."}, "src_uid": "745f81dcb4f23254bf6602f9f389771b"}
{"nl": {"description": "Kirill plays a new computer game. He came to the potion store where he can buy any potion. Each potion is characterized by two integers\u00a0\u2014 amount of experience and cost. The efficiency of a potion is the ratio of the amount of experience to the cost. Efficiency may be a non-integer number.For each two integer numbers a and b such that l\u2009\u2264\u2009a\u2009\u2264\u2009r and x\u2009\u2264\u2009b\u2009\u2264\u2009y there is a potion with experience a and cost b in the store (that is, there are (r\u2009-\u2009l\u2009+\u20091)\u00b7(y\u2009-\u2009x\u2009+\u20091) potions).Kirill wants to buy a potion which has efficiency k. Will he be able to do this?", "input_spec": "First string contains five integer numbers l, r, x, y, k (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009107, 1\u2009\u2264\u2009x\u2009\u2264\u2009y\u2009\u2264\u2009107, 1\u2009\u2264\u2009k\u2009\u2264\u2009107).", "output_spec": "Print \"YES\" without quotes if a potion with efficiency exactly k can be bought in the store and \"NO\" without quotes otherwise. You can output each of the letters in any register.", "sample_inputs": ["1 10 1 10 1", "1 5 6 10 1"], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "1110d3671e9f77fd8d66dca6e74d2048"}
{"nl": {"description": "A few years ago, Hitagi encountered a giant crab, who stole the whole of her body weight. Ever since, she tried to avoid contact with others, for fear that this secret might be noticed.To get rid of the oddity and recover her weight, a special integer sequence is needed. Hitagi's sequence has been broken for a long time, but now Kaiki provides an opportunity.Hitagi's sequence a has a length of n. Lost elements in it are denoted by zeros. Kaiki provides another sequence b, whose length k equals the number of lost elements in a (i.e. the number of zeros). Hitagi is to replace each zero in a with an element from b so that each element in b should be used exactly once. Hitagi knows, however, that, apart from 0, no integer occurs in a and b more than once in total.If the resulting sequence is not an increasing sequence, then it has the power to recover Hitagi from the oddity. You are to determine whether this is possible, or Kaiki's sequence is just another fake. In other words, you should detect whether it is possible to replace each zero in a with an integer from b so that each integer from b is used exactly once, and the resulting sequence is not increasing.", "input_spec": "The first line of input contains two space-separated positive integers n (2\u2009\u2264\u2009n\u2009\u2264\u2009100) and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n) \u2014 the lengths of sequence a and b respectively. The second line contains n space-separated integers a1,\u2009a2,\u2009...,\u2009an (0\u2009\u2264\u2009ai\u2009\u2264\u2009200) \u2014 Hitagi's broken sequence with exactly k zero elements. The third line contains k space-separated integers b1,\u2009b2,\u2009...,\u2009bk (1\u2009\u2264\u2009bi\u2009\u2264\u2009200) \u2014 the elements to fill into Hitagi's sequence. Input guarantees that apart from 0, no integer occurs in a and b more than once in total.", "output_spec": "Output \"Yes\" if it's possible to replace zeros in a with elements in b and make the resulting sequence not increasing, and \"No\" otherwise.", "sample_inputs": ["4 2\n11 0 0 14\n5 4", "6 1\n2 3 0 8 9 10\n5", "4 1\n8 94 0 4\n89", "7 7\n0 0 0 0 0 0 0\n1 2 3 4 5 6 7"], "sample_outputs": ["Yes", "No", "Yes", "Yes"], "notes": "NoteIn the first sample:   Sequence a is 11,\u20090,\u20090,\u200914.  Two of the elements are lost, and the candidates in b are 5 and 4.  There are two possible resulting sequences: 11,\u20095,\u20094,\u200914 and 11,\u20094,\u20095,\u200914, both of which fulfill the requirements. Thus the answer is \"Yes\". In the second sample, the only possible resulting sequence is 2,\u20093,\u20095,\u20098,\u20099,\u200910, which is an increasing sequence and therefore invalid."}, "src_uid": "40264e84c041fcfb4f8c0af784df102a"}
{"nl": {"description": "Even if the world is full of counterfeits, I still regard it as wonderful.Pile up herbs and incense, and arise again from the flames and ashes of its predecessor\u00a0\u2014 as is known to many, the phoenix does it like this.The phoenix has a rather long lifespan, and reincarnates itself once every a! years. Here a! denotes the factorial of integer a, that is, a!\u2009=\u20091\u2009\u00d7\u20092\u2009\u00d7\u2009...\u2009\u00d7\u2009a. Specifically, 0!\u2009=\u20091.Koyomi doesn't care much about this, but before he gets into another mess with oddities, he is interested in the number of times the phoenix will reincarnate in a timespan of b! years, that is, . Note that when b\u2009\u2265\u2009a this value is always integer.As the answer can be quite large, it would be enough for Koyomi just to know the last digit of the answer in decimal representation. And you're here to provide Koyomi with this knowledge.", "input_spec": "The first and only line of input contains two space-separated integers a and b (0\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u20091018).", "output_spec": "Output one line containing a single decimal digit\u00a0\u2014 the last digit of the value that interests Koyomi.", "sample_inputs": ["2 4", "0 10", "107 109"], "sample_outputs": ["2", "0", "2"], "notes": "NoteIn the first example, the last digit of  is 2;In the second example, the last digit of  is 0;In the third example, the last digit of  is 2."}, "src_uid": "2ed5a7a6176ed9b0bda1de21aad13d60"}
{"nl": {"description": "Unary is a minimalistic Brainfuck dialect in which programs are written using only one token. Brainfuck programs use 8 commands: \"+\", \"-\", \"[\", \"]\", \"<\", \">\", \".\" and \",\" (their meaning is not important for the purposes of this problem). Unary programs are created from Brainfuck programs using the following algorithm. First, replace each command with a corresponding binary code, using the following conversion table:   \">\" \u2009\u2192\u2009 1000,  \"<\" \u2009\u2192\u2009 1001,  \"+\" \u2009\u2192\u2009 1010,  \"-\" \u2009\u2192\u2009 1011,  \".\" \u2009\u2192\u2009 1100,  \",\" \u2009\u2192\u2009 1101,  \"[\" \u2009\u2192\u2009 1110,  \"]\" \u2009\u2192\u2009 1111. Next, concatenate the resulting binary codes into one binary number in the same order as in the program. Finally, write this number using unary numeral system \u2014 this is the Unary program equivalent to the original Brainfuck one.You are given a Brainfuck program. Your task is to calculate the size of the equivalent Unary program, and print it modulo 1000003 (106\u2009+\u20093).", "input_spec": "The input will consist of a single line p which gives a Brainfuck program. String p will contain between 1 and 100 characters, inclusive. Each character of p will be \"+\", \"-\", \"[\", \"]\", \"<\", \">\", \".\" or \",\".", "output_spec": "Output the size of the equivalent Unary program modulo 1000003 (106\u2009+\u20093).", "sample_inputs": [",.", "++++[>,.<-]"], "sample_outputs": ["220", "61425"], "notes": "NoteTo write a number n in unary numeral system, one simply has to write 1 n times. For example, 5 written in unary system will be 11111.In the first example replacing Brainfuck commands with binary code will give us 1101 1100. After we concatenate the codes, we'll get 11011100 in binary system, or 220 in decimal. That's exactly the number of tokens in the equivalent Unary program."}, "src_uid": "04fc8dfb856056f35d296402ad1b2da1"}
{"nl": {"description": "Vasya is studying number theory. He has denoted a function f(a,\u2009b) such that:  f(a,\u20090)\u2009=\u20090;  f(a,\u2009b)\u2009=\u20091\u2009+\u2009f(a,\u2009b\u2009-\u2009gcd(a,\u2009b)), where gcd(a,\u2009b) is the greatest common divisor of a and b. Vasya has two numbers x and y, and he wants to calculate f(x,\u2009y). He tried to do it by himself, but found out that calculating this function the way he wants to do that might take very long time. So he decided to ask you to implement a program that will calculate this function swiftly.", "input_spec": "The first line contains two integer numbers x and y (1\u2009\u2264\u2009x,\u2009y\u2009\u2264\u20091012).", "output_spec": "Print f(x,\u2009y).", "sample_inputs": ["3 5", "6 3"], "sample_outputs": ["3", "1"], "notes": null}, "src_uid": "ea92cd905e9725e7fcb87b9ed4f64c2e"}
{"nl": {"description": "Winnie-the-Pooh likes honey very much! That is why he decided to visit his friends. Winnie has got three best friends: Rabbit, Owl and Eeyore, each of them lives in his own house. There are winding paths between each pair of houses. The length of a path between Rabbit's and Owl's houses is a meters, between Rabbit's and Eeyore's house is b meters, between Owl's and Eeyore's house is c meters.For enjoying his life and singing merry songs Winnie-the-Pooh should have a meal n times a day. Now he is in the Rabbit's house and has a meal for the first time. Each time when in the friend's house where Winnie is now the supply of honey is about to end, Winnie leaves that house. If Winnie has not had a meal the required amount of times, he comes out from the house and goes to someone else of his two friends. For this he chooses one of two adjacent paths, arrives to the house on the other end and visits his friend. You may assume that when Winnie is eating in one of his friend's house, the supply of honey in other friend's houses recover (most probably, they go to the supply store).Winnie-the-Pooh does not like physical activity. He wants to have a meal n times, traveling minimum possible distance. Help him to find this distance.", "input_spec": "First line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 number of visits. Second line contains an integer a (1\u2009\u2264\u2009a\u2009\u2264\u2009100)\u00a0\u2014 distance between Rabbit's and Owl's houses. Third line contains an integer b (1\u2009\u2264\u2009b\u2009\u2264\u2009100)\u00a0\u2014 distance between Rabbit's and Eeyore's houses. Fourth line contains an integer c (1\u2009\u2264\u2009c\u2009\u2264\u2009100)\u00a0\u2014 distance between Owl's and Eeyore's houses.", "output_spec": "Output one number\u00a0\u2014 minimum distance in meters Winnie must go through to have a meal n times.", "sample_inputs": ["3\n2\n3\n1", "1\n2\n3\n5"], "sample_outputs": ["3", "0"], "notes": "NoteIn the first test case the optimal path for Winnie is the following: first have a meal in Rabbit's house, then in Owl's house, then in Eeyore's house. Thus he will pass the distance 2\u2009+\u20091\u2009=\u20093.In the second test case Winnie has a meal in Rabbit's house and that is for him. So he doesn't have to walk anywhere at all."}, "src_uid": "6058529f0144c853e9e17ed7c661fc50"}
{"nl": {"description": "Giga Tower is the tallest and deepest building in Cyberland. There are 17\u2009777\u2009777\u2009777 floors, numbered from \u2009-\u20098\u2009888\u2009888\u2009888 to 8\u2009888\u2009888\u2009888. In particular, there is floor 0 between floor \u2009-\u20091 and floor 1. Every day, thousands of tourists come to this place to enjoy the wonderful view. In Cyberland, it is believed that the number \"8\" is a lucky number (that's why Giga Tower has 8\u2009888\u2009888\u2009888 floors above the ground), and, an integer is lucky, if and only if its decimal notation contains at least one digit \"8\". For example, 8,\u2009\u2009-\u2009180,\u2009808 are all lucky while 42,\u2009\u2009-\u200910 are not. In the Giga Tower, if you write code at a floor with lucky floor number, good luck will always be with you (Well, this round is #278, also lucky, huh?).Tourist Henry goes to the tower to seek good luck. Now he is at the floor numbered a. He wants to find the minimum positive integer b, such that, if he walks b floors higher, he will arrive at a floor with a lucky number. ", "input_spec": "The only line of input contains an integer a (\u2009-\u2009109\u2009\u2264\u2009a\u2009\u2264\u2009109).", "output_spec": "Print the minimum b in a line.", "sample_inputs": ["179", "-1", "18"], "sample_outputs": ["1", "9", "10"], "notes": "NoteFor the first sample, he has to arrive at the floor numbered 180.For the second sample, he will arrive at 8.Note that b should be positive, so the answer for the third sample is 10, not 0."}, "src_uid": "4e57740be015963c190e0bfe1ab74cb9"}
{"nl": {"description": "You are given a mysterious language (codenamed \"Secret\") available in \"Custom Test\" tab. Find out what this language is and write a program which outputs its name. Note that the program must be written in this language.", "input_spec": "This program has only one test, and it's empty (it doesn't give your program anything to read).", "output_spec": "Output the name of the mysterious language.", "sample_inputs": [], "sample_outputs": [], "notes": null}, "src_uid": "ef8239a0f77c538d2d9b246b86be63fe"}
{"nl": {"description": "Limak is a little polar bear. He plays by building towers from blocks. Every block is a cube with positive integer length of side. Limak has infinitely many blocks of each side length.A block with side a has volume a3. A tower consisting of blocks with sides a1,\u2009a2,\u2009...,\u2009ak has the total volume a13\u2009+\u2009a23\u2009+\u2009...\u2009+\u2009ak3.Limak is going to build a tower. First, he asks you to tell him a positive integer X\u00a0\u2014 the required total volume of the tower. Then, Limak adds new blocks greedily, one by one. Each time he adds the biggest block such that the total volume doesn't exceed X.Limak asks you to choose X not greater than m. Also, he wants to maximize the number of blocks in the tower at the end (however, he still behaves greedily). Secondarily, he wants to maximize X.Can you help Limak? Find the maximum number of blocks his tower can have and the maximum X\u2009\u2264\u2009m that results this number of blocks.", "input_spec": "The only line of the input contains one integer m (1\u2009\u2264\u2009m\u2009\u2264\u20091015), meaning that Limak wants you to choose X between 1 and m, inclusive.", "output_spec": "Print two integers\u00a0\u2014 the maximum number of blocks in the tower and the maximum required total volume X, resulting in the maximum number of blocks.", "sample_inputs": ["48", "6"], "sample_outputs": ["9 42", "6 6"], "notes": "NoteIn the first sample test, there will be 9 blocks if you choose X\u2009=\u200923 or X\u2009=\u200942. Limak wants to maximize X secondarily so you should choose 42.In more detail, after choosing X\u2009=\u200942 the process of building a tower is:  Limak takes a block with side 3 because it's the biggest block with volume not greater than 42. The remaining volume is 42\u2009-\u200927\u2009=\u200915.  The second added block has side 2, so the remaining volume is 15\u2009-\u20098\u2009=\u20097.  Finally, Limak adds 7 blocks with side 1, one by one. So, there are 9 blocks in the tower. The total volume is is 33\u2009+\u200923\u2009+\u20097\u00b713\u2009=\u200927\u2009+\u20098\u2009+\u20097\u2009=\u200942."}, "src_uid": "385cf3c40c96f0879788b766eeb25139"}
{"nl": {"description": "Well, the series which Stepan watched for a very long time, ended. In total, the series had n episodes. For each of them, Stepan remembers either that he definitely has watched it, or that he definitely hasn't watched it, or he is unsure, has he watched this episode or not. Stepan's dissatisfaction is the maximum number of consecutive series that Stepan did not watch.Your task is to determine according to Stepan's memories if his dissatisfaction could be exactly equal to k.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 0\u2009\u2264\u2009k\u2009\u2264\u2009n) \u2014 the number of episodes in the series and the dissatisfaction which should be checked.  The second line contains the sequence which consists of n symbols \"Y\", \"N\" and \"?\". If the i-th symbol equals \"Y\", Stepan remembers that he has watched the episode number i. If the i-th symbol equals \"N\", Stepan remembers that he hasn't watched the epizode number i. If the i-th symbol equals \"?\", Stepan doesn't exactly remember if he has watched the episode number i or not.", "output_spec": "If Stepan's dissatisfaction can be exactly equal to k, then print \"YES\" (without qoutes). Otherwise print \"NO\" (without qoutes).", "sample_inputs": ["5 2\nNYNNY", "6 1\n????NN"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first test Stepan remembers about all the episodes whether he has watched them or not. His dissatisfaction is 2, because he hasn't watch two episodes in a row \u2014 the episode number 3 and the episode number 4. The answer is \"YES\", because k\u2009=\u20092.In the second test k\u2009=\u20091, Stepan's dissatisfaction is greater than or equal to 2 (because he remembers that he hasn't watch at least two episodes in a row \u2014 number 5 and number 6), even if he has watched the episodes from the first to the fourth, inclusive."}, "src_uid": "5bd578d3da5837c259b222336a194d12"}
{"nl": {"description": "Amr loves Geometry. One day he came up with a very interesting problem.Amr has a circle of radius r and center in point (x,\u2009y). He wants the circle center to be in new position (x',\u2009y').In one step Amr can put a pin to the border of the circle in a certain point, then rotate the circle around that pin by any angle and finally remove the pin.Help Amr to achieve his goal in minimum number of steps.", "input_spec": "Input consists of 5 space-separated integers r, x, y, x' y' (1\u2009\u2264\u2009r\u2009\u2264\u2009105, \u2009-\u2009105\u2009\u2264\u2009x,\u2009y,\u2009x',\u2009y'\u2009\u2264\u2009105), circle radius, coordinates of original center of the circle and coordinates of destination center of the circle respectively.", "output_spec": "Output a single integer \u2014 minimum number of steps required to move the center of the circle to the destination point.", "sample_inputs": ["2 0 0 0 4", "1 1 1 4 4", "4 5 6 5 6"], "sample_outputs": ["1", "3", "0"], "notes": "NoteIn the first sample test the optimal way is to put a pin at point (0,\u20092) and rotate the circle by 180 degrees counter-clockwise (or clockwise, no matter)."}, "src_uid": "698da80c7d24252b57cca4e4f0ca7031"}
{"nl": {"description": "John Doe has a list of all Fibonacci numbers modulo 1013. This list is infinite, it starts with numbers 0 and 1. Each number in the list, apart from the first two, is a sum of previous two modulo 1013. That is, John's list is made from the Fibonacci numbers' list by replacing each number there by the remainder when divided by 1013. John got interested in number f (0\u2009\u2264\u2009f\u2009<\u20091013) and now wants to find its first occurrence in the list given above. Help John and find the number of the first occurence of number f in the list or otherwise state that number f does not occur in the list. The numeration in John's list starts from zero. There, the 0-th position is the number 0, the 1-st position is the number 1, the 2-nd position is the number 1, the 3-rd position is the number 2, the 4-th position is the number 3 and so on. Thus, the beginning of the list looks like this: 0,\u20091,\u20091,\u20092,\u20093,\u20095,\u20098,\u200913,\u200921,\u2009...", "input_spec": "The first line contains the single integer f (0\u2009\u2264\u2009f\u2009<\u20091013) \u2014 the number, which position in the list we should find. Please, do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specifier. ", "output_spec": "Print a single number \u2014 the number of the first occurrence of the given number in John's list. If this number doesn't occur in John's list, print -1.", "sample_inputs": ["13", "377"], "sample_outputs": ["7", "14"], "notes": null}, "src_uid": "cbf786abfceeb8df29732c8a872f7f8a"}
{"nl": {"description": "Catherine has a deck of n cards, each of which is either red, green, or blue. As long as there are at least two cards left, she can do one of two actions:   take any two (not necessarily adjacent) cards with different colors and exchange them for a new card of the third color;  take any two (not necessarily adjacent) cards with the same color and exchange them for a new card with that color. She repeats this process until there is only one card left. What are the possible colors for the final card?", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009200)\u00a0\u2014 the total number of cards. The next line contains a string s of length n \u2014 the colors of the cards. s contains only the characters 'B', 'G', and 'R', representing blue, green, and red, respectively.", "output_spec": "Print a single string of up to three characters\u00a0\u2014 the possible colors of the final card (using the same symbols as the input) in alphabetical order.", "sample_inputs": ["2\nRB", "3\nGRG", "5\nBBBBB"], "sample_outputs": ["G", "BR", "B"], "notes": "NoteIn the first sample, Catherine has one red card and one blue card, which she must exchange for a green card.In the second sample, Catherine has two green cards and one red card. She has two options: she can exchange the two green cards for a green card, then exchange the new green card and the red card for a blue card. Alternatively, she can exchange a green and a red card for a blue card, then exchange the blue card and remaining green card for a red card.In the third sample, Catherine only has blue cards, so she can only exchange them for more blue cards."}, "src_uid": "4cedd3b70d793bc8ed4a93fc5a827f8f"}
{"nl": {"description": "Jzzhu has a big rectangular chocolate bar that consists of n\u2009\u00d7\u2009m unit squares. He wants to cut this bar exactly k times. Each cut must meet the following requirements:  each cut should be straight (horizontal or vertical);  each cut should go along edges of unit squares (it is prohibited to divide any unit chocolate square with cut);  each cut should go inside the whole chocolate bar, and all cuts must be distinct. The picture below shows a possible way to cut a 5\u2009\u00d7\u20096 chocolate for 5 times.  Imagine Jzzhu have made k cuts and the big chocolate is splitted into several pieces. Consider the smallest (by area) piece of the chocolate, Jzzhu wants this piece to be as large as possible. What is the maximum possible area of smallest piece he can get with exactly k cuts? The area of a chocolate piece is the number of unit squares in it.", "input_spec": "A single line contains three integers n,\u2009m,\u2009k (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009109;\u00a01\u2009\u2264\u2009k\u2009\u2264\u20092\u00b7109).", "output_spec": "Output a single integer representing the answer. If it is impossible to cut the big chocolate k times, print -1.", "sample_inputs": ["3 4 1", "6 4 2", "2 3 4"], "sample_outputs": ["6", "8", "-1"], "notes": "NoteIn the first sample, Jzzhu can cut the chocolate following the picture below:  In the second sample the optimal division looks like this:  In the third sample, it's impossible to cut a 2\u2009\u00d7\u20093 chocolate 4 times."}, "src_uid": "bb453bbe60769bcaea6a824c72120f73"}
{"nl": {"description": "Holidays have finished. Thanks to the help of the hacker Leha, Noora managed to enter the university of her dreams which is located in a town Pavlopolis. It's well known that universities provide students with dormitory for the period of university studies. Consequently Noora had to leave Vi\u010dkopolis and move to Pavlopolis. Thus Leha was left completely alone in a quiet town Vi\u010dkopolis. He almost even fell into a depression from boredom!Leha came up with a task for himself to relax a little. He chooses two integers A and B and then calculates the greatest common divisor of integers \"A factorial\" and \"B factorial\". Formally the hacker wants to find out GCD(A!,\u2009B!). It's well known that the factorial of an integer x is a product of all positive integers less than or equal to x. Thus x!\u2009=\u20091\u00b72\u00b73\u00b7...\u00b7(x\u2009-\u20091)\u00b7x. For example 4!\u2009=\u20091\u00b72\u00b73\u00b74\u2009=\u200924. Recall that GCD(x,\u2009y) is the largest positive integer q that divides (without a remainder) both x and y.Leha has learned how to solve this task very effective. You are able to cope with it not worse, aren't you?", "input_spec": "The first and single line contains two integers A and B (1\u2009\u2264\u2009A,\u2009B\u2009\u2264\u2009109,\u2009min(A,\u2009B)\u2009\u2264\u200912).", "output_spec": "Print a single integer denoting the greatest common divisor of integers A! and B!.", "sample_inputs": ["4 3"], "sample_outputs": ["6"], "notes": "NoteConsider the sample.4!\u2009=\u20091\u00b72\u00b73\u00b74\u2009=\u200924. 3!\u2009=\u20091\u00b72\u00b73\u2009=\u20096. The greatest common divisor of integers 24 and 6 is exactly 6."}, "src_uid": "7bf30ceb24b66d91382e97767f9feeb6"}
{"nl": {"description": "It is known that fleas in Berland can jump only vertically and horizontally, and the length of the jump is always equal to s centimeters. A flea has found herself at the center of some cell of the checked board of the size n\u2009\u00d7\u2009m centimeters (each cell is 1\u2009\u00d7\u20091 centimeters). She can jump as she wishes for an arbitrary number of times, she can even visit a cell more than once. The only restriction is that she cannot jump out of the board.The flea can count the amount of cells that she can reach from the starting position (x,\u2009y). Let's denote this amount by dx,\u2009y. Your task is to find the number of such starting positions (x,\u2009y), which have the maximum possible value of dx,\u2009y.", "input_spec": "The first line contains three integers n, m, s (1\u2009\u2264\u2009n,\u2009m,\u2009s\u2009\u2264\u2009106) \u2014 length of the board, width of the board and length of the flea's jump.", "output_spec": "Output the only integer \u2014 the number of the required starting positions of the flea.", "sample_inputs": ["2 3 1000000", "3 3 2"], "sample_outputs": ["6", "4"], "notes": null}, "src_uid": "e853733fb2ed87c56623ff9a5ac09c36"}
{"nl": {"description": "Mr. Santa asks all the great programmers of the world to solve a trivial problem. He gives them an integer m and asks for the number of positive integers n, such that the factorial of n ends with exactly m zeroes. Are you among those great programmers who can solve this problem?", "input_spec": "The only line of input contains an integer m (1\u2009\u2264\u2009m\u2009\u2264\u2009100\u2009000)\u00a0\u2014 the required number of trailing zeroes in factorial.", "output_spec": "First print k\u00a0\u2014 the number of values of n such that the factorial of n ends with m zeroes. Then print these k integers in increasing order.", "sample_inputs": ["1", "5"], "sample_outputs": ["5\n5 6 7 8 9", "0"], "notes": "NoteThe factorial of n is equal to the product of all integers from 1 to n inclusive, that is n!\u2009=\u20091\u00b72\u00b73\u00b7...\u00b7n.In the first sample, 5!\u2009=\u2009120, 6!\u2009=\u2009720, 7!\u2009=\u20095040, 8!\u2009=\u200940320 and 9!\u2009=\u2009362880."}, "src_uid": "c27ecc6e4755b21f95a6b1b657ef0744"}
{"nl": {"description": "The Smart Beaver from ABBYY got hooked on square matrices. Now he is busy studying an n\u2009\u00d7\u2009n size matrix, where n is odd. The Smart Beaver considers the following matrix elements good:    Elements of the main diagonal.   Elements of the secondary diagonal.   Elements of the \"middle\" row \u2014 the row which has exactly  rows above it and the same number of rows below it.   Elements of the \"middle\" column \u2014 the column that has exactly  columns to the left of it and the same number of columns to the right of it.    The figure shows a 5\u2009\u00d7\u20095 matrix.   The good elements are marked with green.  Help the Smart Beaver count the sum of good elements of the given matrix.", "input_spec": "The first line of input data contains a single odd integer n. Each of the next n lines contains n integers aij (0\u2009\u2264\u2009aij\u2009\u2264\u2009100) separated by single spaces \u2014 the elements of the given matrix. The input limitations for getting 30 points are:    1\u2009\u2264\u2009n\u2009\u2264\u20095  The input limitations for getting 100 points are:   1\u2009\u2264\u2009n\u2009\u2264\u2009101 ", "output_spec": "Print a single integer \u2014 the sum of good matrix elements.", "sample_inputs": ["3\n1 2 3\n4 5 6\n7 8 9", "5\n1 1 1 1 1\n1 1 1 1 1\n1 1 1 1 1\n1 1 1 1 1\n1 1 1 1 1"], "sample_outputs": ["45", "17"], "notes": "NoteIn the first sample all matrix elements will be good. Good elements in the second sample are shown on the figure."}, "src_uid": "5ebfad36e56d30c58945c5800139b880"}
{"nl": {"description": "A group of $$$n$$$ dancers rehearses a performance for the closing ceremony. The dancers are arranged in a row, they've studied their dancing moves and can't change positions. For some of them, a white dancing suit is already bought, for some of them \u2014 a black one, and for the rest the suit will be bought in the future.On the day when the suits were to be bought, the director was told that the participants of the olympiad will be happy if the colors of the suits on the scene will form a palindrome. A palindrome is a sequence that is the same when read from left to right and when read from right to left. The director liked the idea, and she wants to buy suits so that the color of the leftmost dancer's suit is the same as the color of the rightmost dancer's suit, the 2nd left is the same as 2nd right, and so on.The director knows how many burls it costs to buy a white suit, and how many burls to buy a black suit. You need to find out whether it is possible to buy suits to form a palindrome, and if it's possible, what's the minimal cost of doing so. Remember that dancers can not change positions, and due to bureaucratic reasons it is not allowed to buy new suits for the dancers who already have suits, even if it reduces the overall spending.", "input_spec": "The first line contains three integers $$$n$$$, $$$a$$$, and $$$b$$$ ($$$1 \\leq n \\leq 20$$$, $$$1 \\leq a, b \\leq 100$$$)\u00a0\u2014 the number of dancers, the cost of a white suit, and the cost of a black suit. The next line contains $$$n$$$ numbers $$$c_i$$$, $$$i$$$-th of which denotes the color of the suit of the $$$i$$$-th dancer. Number $$$0$$$ denotes the white color, $$$1$$$\u00a0\u2014 the black color, and $$$2$$$ denotes that a suit for this dancer is still to be bought.", "output_spec": "If it is not possible to form a palindrome without swapping dancers and buying new suits for those who have one, then output -1. Otherwise, output the minimal price to get the desired visual effect.", "sample_inputs": ["5 100 1\n0 1 2 1 2", "3 10 12\n1 2 0", "3 12 1\n0 1 0"], "sample_outputs": ["101", "-1", "0"], "notes": "NoteIn the first sample, the cheapest way to obtain palindromic colors is to buy a black suit for the third from left dancer and a white suit for the rightmost dancer.In the second sample, the leftmost dancer's suit already differs from the rightmost dancer's suit so there is no way to obtain the desired coloring.In the third sample, all suits are already bought and their colors form a palindrome."}, "src_uid": "af07223819aeb5bd6ded4340c472b2b6"}
{"nl": {"description": "Long time ago Alex created an interesting problem about parallelogram. The input data for this problem contained four integer points on the Cartesian plane, that defined the set of vertices of some non-degenerate (positive area) parallelogram. Points not necessary were given in the order of clockwise or counterclockwise traversal.Alex had very nice test for this problem, but is somehow happened that the last line of the input was lost and now he has only three out of four points of the original parallelogram. He remembers that test was so good that he asks you to restore it given only these three points.", "input_spec": "The input consists of three lines, each containing a pair of integer coordinates xi and yi (\u2009-\u20091000\u2009\u2264\u2009xi,\u2009yi\u2009\u2264\u20091000). It's guaranteed that these three points do not lie on the same line and no two of them coincide.", "output_spec": "First print integer k\u00a0\u2014 the number of ways to add one new integer point such that the obtained set defines some parallelogram of positive area. There is no requirement for the points to be arranged in any special order (like traversal), they just define the set of vertices. Then print k lines, each containing a pair of integer\u00a0\u2014 possible coordinates of the fourth point.", "sample_inputs": ["0 0\n1 0\n0 1"], "sample_outputs": ["3\n1 -1\n-1 1\n1 1"], "notes": "NoteIf you need clarification of what parallelogram is, please check Wikipedia page:https://en.wikipedia.org/wiki/Parallelogram"}, "src_uid": "7725f9906a1b87bf4e866df03112f1e0"}
{"nl": {"description": "Dwarfs have planted a very interesting plant, which is a triangle directed \"upwards\". This plant has an amusing feature. After one year a triangle plant directed \"upwards\" divides into four triangle plants: three of them will point \"upwards\" and one will point \"downwards\". After another year, each triangle plant divides into four triangle plants: three of them will be directed in the same direction as the parent plant, and one of them will be directed in the opposite direction. Then each year the process repeats. The figure below illustrates this process.  Help the dwarfs find out how many triangle plants that point \"upwards\" will be in n years.", "input_spec": "The first line contains a single integer n (0\u2009\u2264\u2009n\u2009\u2264\u20091018) \u2014 the number of full years when the plant grew. Please do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specifier.", "output_spec": "Print a single integer \u2014 the remainder of dividing the number of plants that will point \"upwards\" in n years by 1000000007 (109\u2009+\u20097).", "sample_inputs": ["1", "2"], "sample_outputs": ["3", "10"], "notes": "NoteThe first test sample corresponds to the second triangle on the figure in the statement. The second test sample corresponds to the third one."}, "src_uid": "782b819eb0bfc86d6f96f15ac09d5085"}
{"nl": {"description": "At first, let's define function $$$f(x)$$$ as follows: $$$$$$ \\begin{matrix} f(x) & = & \\left\\{ \\begin{matrix} \\frac{x}{2} & \\mbox{if } x \\text{ is even} \\\\ x - 1 & \\mbox{otherwise } \\end{matrix} \\right. \\end{matrix} $$$$$$We can see that if we choose some value $$$v$$$ and will apply function $$$f$$$ to it, then apply $$$f$$$ to $$$f(v)$$$, and so on, we'll eventually get $$$1$$$. Let's write down all values we get in this process in a list and denote this list as $$$path(v)$$$. For example, $$$path(1) = [1]$$$, $$$path(15) = [15, 14, 7, 6, 3, 2, 1]$$$, $$$path(32) = [32, 16, 8, 4, 2, 1]$$$.Let's write all lists $$$path(x)$$$ for every $$$x$$$ from $$$1$$$ to $$$n$$$. The question is next: what is the maximum value $$$y$$$ such that $$$y$$$ is contained in at least $$$k$$$ different lists $$$path(x)$$$?Formally speaking, you need to find maximum $$$y$$$ such that $$$\\left| \\{ x ~|~ 1 \\le x \\le n, y \\in path(x) \\} \\right| \\ge k$$$.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le k \\le n \\le 10^{18}$$$).", "output_spec": "Print the only integer \u2014 the maximum value that is contained in at least $$$k$$$ paths.", "sample_inputs": ["11 3", "11 6", "20 20", "14 5", "1000000 100"], "sample_outputs": ["5", "4", "1", "6", "31248"], "notes": "NoteIn the first example, the answer is $$$5$$$, since $$$5$$$ occurs in $$$path(5)$$$, $$$path(10)$$$ and $$$path(11)$$$.In the second example, the answer is $$$4$$$, since $$$4$$$ occurs in $$$path(4)$$$, $$$path(5)$$$, $$$path(8)$$$, $$$path(9)$$$, $$$path(10)$$$ and $$$path(11)$$$.In the third example $$$n = k$$$, so the answer is $$$1$$$, since $$$1$$$ is the only number occuring in all paths for integers from $$$1$$$ to $$$20$$$."}, "src_uid": "783c4b3179c558369f94f4a16ac562d4"}
{"nl": {"description": "This is the easy version of the problem. The only difference between the easy version and the hard version is the constraints on $$$n$$$. You can only make hacks if both versions are solved.A permutation of $$$1, 2, \\ldots, n$$$ is a sequence of $$$n$$$ integers, where each integer from $$$1$$$ to $$$n$$$ appears exactly once. For example, $$$[2,3,1,4]$$$ is a permutation of $$$1, 2, 3, 4$$$, but $$$[1,4,2,2]$$$ isn't because $$$2$$$ appears twice in it.Recall that the number of inversions in a permutation $$$a_1, a_2, \\ldots, a_n$$$ is the number of pairs of indices $$$(i, j)$$$ such that $$$i < j$$$ and $$$a_i > a_j$$$.Let $$$p$$$ and $$$q$$$ be two permutations of $$$1, 2, \\ldots, n$$$. Find the number of permutation pairs $$$(p,q)$$$ that satisfy the following conditions:  $$$p$$$ is lexicographically smaller than $$$q$$$.  the number of inversions in $$$p$$$ is greater than the number of inversions in $$$q$$$. Print the number of such pairs modulo $$$mod$$$. Note that $$$mod$$$ may not be a prime.", "input_spec": "The only line contains two integers $$$n$$$ and $$$mod$$$ ($$$1\\le n\\le 50$$$, $$$1\\le mod\\le 10^9$$$).", "output_spec": "Print one integer, which is the answer modulo $$$mod$$$.", "sample_inputs": ["4 403458273"], "sample_outputs": ["17"], "notes": "NoteThe following are all valid pairs $$$(p,q)$$$ when $$$n=4$$$.  $$$p=[1,3,4,2]$$$, $$$q=[2,1,3,4]$$$,  $$$p=[1,4,2,3]$$$, $$$q=[2,1,3,4]$$$,  $$$p=[1,4,3,2]$$$, $$$q=[2,1,3,4]$$$,  $$$p=[1,4,3,2]$$$, $$$q=[2,1,4,3]$$$,  $$$p=[1,4,3,2]$$$, $$$q=[2,3,1,4]$$$,  $$$p=[1,4,3,2]$$$, $$$q=[3,1,2,4]$$$,  $$$p=[2,3,4,1]$$$, $$$q=[3,1,2,4]$$$,  $$$p=[2,4,1,3]$$$, $$$q=[3,1,2,4]$$$,  $$$p=[2,4,3,1]$$$, $$$q=[3,1,2,4]$$$,  $$$p=[2,4,3,1]$$$, $$$q=[3,1,4,2]$$$,  $$$p=[2,4,3,1]$$$, $$$q=[3,2,1,4]$$$,  $$$p=[2,4,3,1]$$$, $$$q=[4,1,2,3]$$$,  $$$p=[3,2,4,1]$$$, $$$q=[4,1,2,3]$$$,  $$$p=[3,4,1,2]$$$, $$$q=[4,1,2,3]$$$,  $$$p=[3,4,2,1]$$$, $$$q=[4,1,2,3]$$$,  $$$p=[3,4,2,1]$$$, $$$q=[4,1,3,2]$$$,  $$$p=[3,4,2,1]$$$, $$$q=[4,2,1,3]$$$. "}, "src_uid": "ae0320a57d73fab1d05f5d10fbdb9e1a"}
{"nl": {"description": "HQ9+ is a joke programming language which has only four one-character instructions: \"H\" prints \"Hello, World!\", \"Q\" prints the source code of the program itself, \"9\" prints the lyrics of \"99 Bottles of Beer\" song,  \"+\" increments the value stored in the internal accumulator.Instructions \"H\" and \"Q\" are case-sensitive and must be uppercase. The characters of the program which are not instructions are ignored.You are given a program written in HQ9+. You have to figure out whether executing this program will produce any output.", "input_spec": "The input will consist of a single line p which will give a program in HQ9+. String p will contain between 1 and 100 characters, inclusive. ASCII-code of each character of p will be between 33 (exclamation mark) and 126 (tilde), inclusive.", "output_spec": "Output \"YES\", if executing the program will produce any output, and \"NO\" otherwise.", "sample_inputs": ["Hi!", "Codeforces"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first case the program contains only one instruction \u2014 \"H\", which prints \"Hello, World!\".In the second case none of the program characters are language instructions."}, "src_uid": "1baf894c1c7d5aeea01129c7900d3c12"}
{"nl": {"description": "Pasha has two hamsters: Arthur and Alexander. Pasha put n apples in front of them. Pasha knows which apples Arthur likes. Similarly, Pasha knows which apples Alexander likes. Pasha doesn't want any conflict between the hamsters (as they may like the same apple), so he decided to distribute the apples between the hamsters on his own. He is going to give some apples to Arthur and some apples to Alexander. It doesn't matter how many apples each hamster gets but it is important that each hamster gets only the apples he likes. It is possible that somebody doesn't get any apples.Help Pasha distribute all the apples between the hamsters. Note that Pasha wants to distribute all the apples, not just some of them.", "input_spec": "The first line contains integers n, a, b (1\u2009\u2264\u2009n\u2009\u2264\u2009100;\u00a01\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009n) \u2014 the number of apples Pasha has, the number of apples Arthur likes and the number of apples Alexander likes, correspondingly. The next line contains a distinct integers \u2014 the numbers of the apples Arthur likes. The next line contains b distinct integers \u2014 the numbers of the apples Alexander likes. Assume that the apples are numbered from 1 to n. The input is such that the answer exists.", "output_spec": "Print n characters, each of them equals either 1 or 2. If the i-h character equals 1, then the i-th apple should be given to Arthur, otherwise it should be given to Alexander. If there are multiple correct answers, you are allowed to print any of them.", "sample_inputs": ["4 2 3\n1 2\n2 3 4", "5 5 2\n3 4 1 2 5\n2 3"], "sample_outputs": ["1 1 2 2", "1 1 1 1 1"], "notes": null}, "src_uid": "a35a27754c9c095c6f1b2d4adccbfe93"}
{"nl": {"description": "Valera the horse lives on a plane. The Cartesian coordinate system is defined on this plane. Also an infinite spiral is painted on the plane. The spiral consists of segments: [(0,\u20090),\u2009(1,\u20090)], [(1,\u20090),\u2009(1,\u20091)], [(1,\u20091),\u2009(\u2009-\u20091,\u20091)], [(\u2009-\u20091,\u20091),\u2009(\u2009-\u20091,\u2009\u2009-\u20091)], [(\u2009-\u20091,\u2009\u2009-\u20091),\u2009(2,\u2009\u2009-\u20091)], [(2,\u2009\u2009-\u20091),\u2009(2,\u20092)] and so on. Thus, this infinite spiral passes through each integer point of the plane.Valera the horse lives on the plane at coordinates (0,\u20090). He wants to walk along the spiral to point (x,\u2009y). Valera the horse has four legs, so he finds turning very difficult. Count how many times he will have to turn if he goes along a spiral from point (0,\u20090) to point (x,\u2009y).", "input_spec": "The first line contains two space-separated integers x and y (|x|,\u2009|y|\u2009\u2264\u2009100).", "output_spec": "Print a single integer, showing how many times Valera has to turn.", "sample_inputs": ["0 0", "1 0", "0 1", "-1 -1"], "sample_outputs": ["0", "0", "2", "3"], "notes": null}, "src_uid": "2fb2a129e01efc03cfc3ad91dac88382"}
{"nl": {"description": "Student Andrey has been skipping physical education lessons for the whole term, and now he must somehow get a passing grade on this subject. Obviously, it is impossible to do this by legal means, but Andrey doesn't give up. Having obtained an empty certificate from a local hospital, he is going to use his knowledge of local doctor's handwriting to make a counterfeit certificate of illness. However, after writing most of the certificate, Andrey suddenly discovered that doctor's signature is impossible to forge. Or is it?For simplicity, the signature is represented as an $$$n\\times m$$$ grid, where every cell is either filled with ink or empty. Andrey's pen can fill a $$$3\\times3$$$ square without its central cell if it is completely contained inside the grid, as shown below. xxxx.xxxx Determine whether is it possible to forge the signature on an empty $$$n\\times m$$$ grid.", "input_spec": "The first line of input contains two integers $$$n$$$ and $$$m$$$ ($$$3 \\le n, m \\le 1000$$$). Then $$$n$$$ lines follow, each contains $$$m$$$ characters. Each of the characters is either '.', representing an empty cell, or '#', representing an ink filled cell.", "output_spec": "If Andrey can forge the signature, output \"YES\". Otherwise output \"NO\". You can print each letter in any case (upper or lower).", "sample_inputs": ["3 3\n###\n#.#\n###", "3 3\n###\n###\n###", "4 3\n###\n###\n###\n###", "5 7\n.......\n.#####.\n.#.#.#.\n.#####.\n......."], "sample_outputs": ["YES", "NO", "YES", "YES"], "notes": "NoteIn the first sample Andrey can paint the border of the square with the center in $$$(2, 2)$$$.In the second sample the signature is impossible to forge.In the third sample Andrey can paint the borders of the squares with the centers in $$$(2, 2)$$$ and $$$(3, 2)$$$:   we have a clear paper: ............  use the pen with center at $$$(2, 2)$$$. ####.####...  use the pen with center at $$$(3, 2)$$$. ############ In the fourth sample Andrey can paint the borders of the squares with the centers in $$$(3, 3)$$$ and $$$(3, 5)$$$."}, "src_uid": "49e5eabe8d69b3d27a251cccc001ab25"}
{"nl": {"description": "Kurt reaches nirvana when he finds the product of all the digits of some positive integer. Greater value of the product makes the nirvana deeper.Help Kurt find the maximum possible product of digits among all integers from $$$1$$$ to $$$n$$$.", "input_spec": "The only input line contains the integer $$$n$$$ ($$$1 \\le n \\le 2\\cdot10^9$$$).", "output_spec": "Print the maximum product of digits among all integers from $$$1$$$ to $$$n$$$.", "sample_inputs": ["390", "7", "1000000000"], "sample_outputs": ["216", "7", "387420489"], "notes": "NoteIn the first example the maximum product is achieved for $$$389$$$ (the product of digits is $$$3\\cdot8\\cdot9=216$$$).In the second example the maximum product is achieved for $$$7$$$ (the product of digits is $$$7$$$).In the third example the maximum product is achieved for $$$999999999$$$ (the product of digits is $$$9^9=387420489$$$)."}, "src_uid": "38690bd32e7d0b314f701f138ce19dfb"}
{"nl": {"description": "Chloe, the same as Vladik, is a competitive programmer. She didn't have any problems to get to the olympiad like Vladik, but she was confused by the task proposed on the olympiad.Let's consider the following algorithm of generating a sequence of integers. Initially we have a sequence consisting of a single element equal to 1. Then we perform (n\u2009-\u20091) steps. On each step we take the sequence we've got on the previous step, append it to the end of itself and insert in the middle the minimum positive integer we haven't used before. For example, we get the sequence [1,\u20092,\u20091] after the first step, the sequence [1,\u20092,\u20091,\u20093,\u20091,\u20092,\u20091] after the second step.The task is to find the value of the element with index k (the elements are numbered from 1) in the obtained sequence, i.\u00a0e. after (n\u2009-\u20091) steps.Please help Chloe to solve the problem!", "input_spec": "The only line contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u200950, 1\u2009\u2264\u2009k\u2009\u2264\u20092n\u2009-\u20091).", "output_spec": "Print single integer\u00a0\u2014 the integer at the k-th position in the obtained sequence.", "sample_inputs": ["3 2", "4 8"], "sample_outputs": ["2", "4"], "notes": "NoteIn the first sample the obtained sequence is [1,\u20092,\u20091,\u20093,\u20091,\u20092,\u20091]. The number on the second position is 2.In the second sample the obtained sequence is [1,\u20092,\u20091,\u20093,\u20091,\u20092,\u20091,\u20094,\u20091,\u20092,\u20091,\u20093,\u20091,\u20092,\u20091]. The number on the eighth position is 4."}, "src_uid": "0af400ea8e25b1a36adec4cc08912b71"}
{"nl": {"description": "We've got no test cases. A big olympiad is coming up. But the problemsetters' number one priority should be adding another problem to the round. The diameter of a multiset of points on the line is the largest distance between two points from this set. For example, the diameter of the multiset {1,\u20093,\u20092,\u20091} is 2.Diameter of multiset consisting of one point is 0.You are given n points on the line. What is the minimum number of points you have to remove, so that the diameter of the multiset of the remaining points will not exceed d?", "input_spec": "The first line contains two integers n and d (1\u2009\u2264\u2009n\u2009\u2264\u2009100,\u20090\u2009\u2264\u2009d\u2009\u2264\u2009100)\u00a0\u2014 the amount of points and the maximum allowed diameter respectively. The second line contains n space separated integers (1\u2009\u2264\u2009xi\u2009\u2264\u2009100)\u00a0\u2014 the coordinates of the points.", "output_spec": "Output a single integer\u00a0\u2014 the minimum number of points you have to remove.", "sample_inputs": ["3 1\n2 1 4", "3 0\n7 7 7", "6 3\n1 3 4 6 9 10"], "sample_outputs": ["1", "0", "3"], "notes": "NoteIn the first test case the optimal strategy is to remove the point with coordinate 4. The remaining points will have coordinates 1 and 2, so the diameter will be equal to 2\u2009-\u20091\u2009=\u20091.In the second test case the diameter is equal to 0, so its is unnecessary to remove any points. In the third test case the optimal strategy is to remove points with coordinates 1, 9 and 10. The remaining points will have coordinates 3, 4 and 6, so the diameter will be equal to 6\u2009-\u20093\u2009=\u20093."}, "src_uid": "6bcb324c072f796f4d50bafea5f624b2"}
{"nl": {"description": "Recently, a chaotic virus Hexadecimal advanced a new theorem which will shake the Universe. She thinks that each Fibonacci number can be represented as sum of three not necessary different Fibonacci numbers.Let's remember how Fibonacci numbers can be calculated. F0\u2009=\u20090, F1\u2009=\u20091, and all the next numbers are Fi\u2009=\u2009Fi\u2009-\u20092\u2009+\u2009Fi\u2009-\u20091.So, Fibonacci numbers make a sequence of numbers: 0, 1, 1, 2, 3, 5, 8, 13, ...If you haven't run away from the PC in fear, you have to help the virus. Your task is to divide given Fibonacci number n by three not necessary different Fibonacci numbers or say that it is impossible.", "input_spec": "The input contains of a single integer n (0\u2009\u2264\u2009n\u2009<\u2009109) \u2014 the number that should be represented by the rules described above. It is guaranteed that n is a Fibonacci number.", "output_spec": "Output three required numbers: a, b and c. If there is no answer for the test you have to print \"I'm too stupid to solve this problem\" without the quotes. If there are multiple answers, print any of them.", "sample_inputs": ["3", "13"], "sample_outputs": ["1 1 1", "2 3 8"], "notes": null}, "src_uid": "db46a6b0380df047aa34ea6a8f0f93c1"}
{"nl": {"description": "Kolya loves putting gnomes at the circle table and giving them coins, and Tanya loves studying triplets of gnomes, sitting in the vertexes of an equilateral triangle.More formally, there are 3n gnomes sitting in a circle. Each gnome can have from 1 to 3 coins. Let's number the places in the order they occur in the circle by numbers from 0 to 3n\u2009-\u20091, let the gnome sitting on the i-th place have ai coins. If there is an integer i (0\u2009\u2264\u2009i\u2009<\u2009n) such that ai\u2009+\u2009ai\u2009+\u2009n\u2009+\u2009ai\u2009+\u20092n\u2009\u2260\u20096, then Tanya is satisfied. Count the number of ways to choose ai so that Tanya is satisfied. As there can be many ways of distributing coins, print the remainder of this number modulo 109\u2009+\u20097. Two ways, a and b, are considered distinct if there is index i (0\u2009\u2264\u2009i\u2009<\u20093n), such that ai\u2009\u2260\u2009bi (that is, some gnome got different number of coins in these two ways).", "input_spec": "A single line contains number n (1\u2009\u2264\u2009n\u2009\u2264\u2009105) \u2014 the number of the gnomes divided by three.", "output_spec": "Print a single number \u2014 the remainder of the number of variants of distributing coins that satisfy Tanya modulo 109\u2009+\u20097.", "sample_inputs": ["1", "2"], "sample_outputs": ["20", "680"], "notes": "Note20 ways for n\u2009=\u20091 (gnome with index 0 sits on the top of the triangle, gnome 1 on the right vertex, gnome 2 on the left vertex):   "}, "src_uid": "eae87ec16c284f324d86b7e65fda093c"}
{"nl": {"description": "Petya has an array $$$a$$$ consisting of $$$n$$$ integers. He wants to remove duplicate (equal) elements.Petya wants to leave only the rightmost entry (occurrence) for each element of the array. The relative order of the remaining unique elements should not be changed.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 50$$$) \u2014 the number of elements in Petya's array. The following line contains a sequence $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 1\\,000$$$) \u2014 the Petya's array.", "output_spec": "In the first line print integer $$$x$$$ \u2014 the number of elements which will be left in Petya's array after he removed the duplicates. In the second line print $$$x$$$ integers separated with a space \u2014 Petya's array after he removed the duplicates. For each unique element only the rightmost entry should be left.", "sample_inputs": ["6\n1 5 5 1 6 1", "5\n2 4 2 4 4", "5\n6 6 6 6 6"], "sample_outputs": ["3\n5 6 1", "2\n2 4", "1\n6"], "notes": "NoteIn the first example you should remove two integers $$$1$$$, which are in the positions $$$1$$$ and $$$4$$$. Also you should remove the integer $$$5$$$, which is in the position $$$2$$$.In the second example you should remove integer $$$2$$$, which is in the position $$$1$$$, and two integers $$$4$$$, which are in the positions $$$2$$$ and $$$4$$$.In the third example you should remove four integers $$$6$$$, which are in the positions $$$1$$$, $$$2$$$, $$$3$$$ and $$$4$$$."}, "src_uid": "1b9d3dfcc2353eac20b84c75c27fab5a"}
{"nl": {"description": "Alice and Bob have decided to play the game \"Rock, Paper, Scissors\". The game consists of several rounds, each round is independent of each other. In each round, both players show one of the following things at the same time: rock, paper or scissors. If both players showed the same things then the round outcome is a draw. Otherwise, the following rules applied:  if one player showed rock and the other one showed scissors, then the player who showed rock is considered the winner and the other one is considered the loser;  if one player showed scissors and the other one showed paper, then the player who showed scissors is considered the winner and the other one is considered the loser;  if one player showed paper and the other one showed rock, then the player who showed paper is considered the winner and the other one is considered the loser. Alice and Bob decided to play exactly $$$n$$$ rounds of the game described above. Alice decided to show rock $$$a_1$$$ times, show scissors $$$a_2$$$ times and show paper $$$a_3$$$ times. Bob decided to show rock $$$b_1$$$ times, show scissors $$$b_2$$$ times and show paper $$$b_3$$$ times. Though, both Alice and Bob did not choose the sequence in which they show things. It is guaranteed that $$$a_1 + a_2 + a_3 = n$$$ and $$$b_1 + b_2 + b_3 = n$$$.Your task is to find two numbers:  the minimum number of round Alice can win;  the maximum number of rounds Alice can win. ", "input_spec": "The first line of the input contains one integer $$$n$$$ ($$$1 \\le n \\le 10^{9}$$$) \u2014 the number of rounds. The second line of the input contains three integers $$$a_1, a_2, a_3$$$ ($$$0 \\le a_i \\le n$$$) \u2014 the number of times Alice will show rock, scissors and paper, respectively. It is guaranteed that $$$a_1 + a_2 + a_3 = n$$$. The third line of the input contains three integers $$$b_1, b_2, b_3$$$ ($$$0 \\le b_j \\le n$$$) \u2014 the number of times Bob will show rock, scissors and paper, respectively. It is guaranteed that $$$b_1 + b_2 + b_3 = n$$$.", "output_spec": "Print two integers: the minimum and the maximum number of rounds Alice can win.", "sample_inputs": ["2\n0 1 1\n1 1 0", "15\n5 5 5\n5 5 5", "3\n0 0 3\n3 0 0", "686\n479 178 29\n11 145 530", "319\n10 53 256\n182 103 34"], "sample_outputs": ["0 1", "0 15", "3 3", "22 334", "119 226"], "notes": "NoteIn the first example, Alice will not win any rounds if she shows scissors and then paper and Bob shows rock and then scissors. In the best outcome, Alice will win one round if she shows paper and then scissors, and Bob shows rock and then scissors.In the second example, Alice will not win any rounds if Bob shows the same things as Alice each round.In the third example, Alice always shows paper and Bob always shows rock so Alice will win all three rounds anyway."}, "src_uid": "e6dc3bc64fc66b6127e2b32cacc06402"}
{"nl": {"description": "Alice and Bob play 5-in-a-row game. They have a playing field of size 10\u2009\u00d7\u200910. In turns they put either crosses or noughts, one at a time. Alice puts crosses and Bob puts noughts.In current match they have made some turns and now it's Alice's turn. She wonders if she can put cross in such empty cell that she wins immediately.Alice wins if some crosses in the field form line of length not smaller than 5. This line can be horizontal, vertical and diagonal.", "input_spec": "You are given matrix 10\u2009\u00d7\u200910 (10 lines of 10 characters each) with capital Latin letters 'X' being a cross, letters 'O' being a nought and '.' being an empty cell. The number of 'X' cells is equal to the number of 'O' cells and there is at least one of each type. There is at least one empty cell. It is guaranteed that in the current arrangement nobody has still won.", "output_spec": "Print 'YES' if it's possible for Alice to win in one turn by putting cross in some empty cell. Otherwise print 'NO'.", "sample_inputs": ["XX.XX.....\n.....OOOO.\n..........\n..........\n..........\n..........\n..........\n..........\n..........\n..........", "XXOXX.....\nOO.O......\n..........\n..........\n..........\n..........\n..........\n..........\n..........\n.........."], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "d5541028a2753c758322c440bdbf9ec6"}
{"nl": {"description": "The circle line of the Roflanpolis subway has $$$n$$$ stations.There are two parallel routes in the subway. The first one visits stations in order $$$1 \\to 2 \\to \\ldots \\to n \\to 1 \\to 2 \\to \\ldots$$$ (so the next stop after station $$$x$$$ is equal to $$$(x+1)$$$ if $$$x < n$$$ and $$$1$$$ otherwise). The second route visits stations in order $$$n \\to (n-1) \\to \\ldots \\to 1 \\to n \\to (n-1) \\to \\ldots$$$ (so the next stop after station $$$x$$$ is equal to $$$(x-1)$$$ if $$$x>1$$$ and $$$n$$$ otherwise). All trains depart their stations simultaneously, and it takes exactly $$$1$$$ minute to arrive at the next station.Two toads live in this city, their names are Daniel and Vlad.Daniel is currently in a train of the first route at station $$$a$$$ and will exit the subway when his train reaches station $$$x$$$.Coincidentally, Vlad is currently in a train of the second route at station $$$b$$$ and he will exit the subway when his train reaches station $$$y$$$.Surprisingly, all numbers $$$a,x,b,y$$$ are distinct.Toad Ilya asks you to check if Daniel and Vlad will ever be at the same station at the same time during their journey. In other words, check if there is a moment when their trains stop at the same station. Note that this includes the moments when Daniel or Vlad enter or leave the subway.", "input_spec": "The first line contains five space-separated integers $$$n$$$, $$$a$$$, $$$x$$$, $$$b$$$, $$$y$$$ ($$$4 \\leq n \\leq 100$$$, $$$1 \\leq a, x, b, y \\leq n$$$, all numbers among $$$a$$$, $$$x$$$, $$$b$$$, $$$y$$$ are distinct)\u00a0\u2014 the number of stations in Roflanpolis, Daniel's start station, Daniel's finish station, Vlad's start station and Vlad's finish station, respectively.", "output_spec": "Output \"YES\" if there is a time moment when Vlad and Daniel are at the same station, and \"NO\" otherwise. You can print each letter in any case (upper or lower).", "sample_inputs": ["5 1 4 3 2", "10 2 1 9 10"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example, Daniel and Vlad start at the stations $$$(1, 3)$$$. One minute later they are at stations $$$(2, 2)$$$. They are at the same station at this moment. Note that Vlad leaves the subway right after that.Consider the second example, let's look at the stations Vlad and Daniel are at. They are:   initially $$$(2, 9)$$$,  after $$$1$$$ minute $$$(3, 8)$$$,  after $$$2$$$ minutes $$$(4, 7)$$$,  after $$$3$$$ minutes $$$(5, 6)$$$,  after $$$4$$$ minutes $$$(6, 5)$$$,  after $$$5$$$ minutes $$$(7, 4)$$$,  after $$$6$$$ minutes $$$(8, 3)$$$,  after $$$7$$$ minutes $$$(9, 2)$$$,  after $$$8$$$ minutes $$$(10, 1)$$$,  after $$$9$$$ minutes $$$(1, 10)$$$. After that, they both leave the subway because they are at their finish stations, so there is no moment when they both are at the same station."}, "src_uid": "5b889751f82c9f32f223cdee0c0095e4"}
{"nl": {"description": "The math faculty of Berland State University has suffered the sudden drop in the math skills of enrolling students. This year the highest grade on the entrance math test was 8. Out of 100! Thus, the decision was made to make the test easier.Future students will be asked just a single question. They are given a sequence of integer numbers $$$a_1, a_2, \\dots, a_n$$$, each number is from $$$1$$$ to $$$3$$$ and $$$a_i \\ne a_{i + 1}$$$ for each valid $$$i$$$. The $$$i$$$-th number represents a type of the $$$i$$$-th figure:  circle;  isosceles triangle with the length of height equal to the length of base;  square. The figures of the given sequence are placed somewhere on a Cartesian plane in such a way that:  $$$(i + 1)$$$-th figure is inscribed into the $$$i$$$-th one;  each triangle base is parallel to OX;  the triangle is oriented in such a way that the vertex opposite to its base is at the top;  each square sides are parallel to the axes;  for each $$$i$$$ from $$$2$$$ to $$$n$$$ figure $$$i$$$ has the maximum possible length of side for triangle and square and maximum radius for circle. Note that the construction is unique for some fixed position and size of just the first figure.The task is to calculate the number of distinct points (not necessarily with integer coordinates) where figures touch. The trick is, however, that the number is sometimes infinite. But that won't make the task difficult for you, will it?So can you pass the math test and enroll into Berland State University?", "input_spec": "The first line contains a single integer $$$n$$$ ($$$2 \\le n \\le 100$$$) \u2014 the number of figures. The second line contains $$$n$$$ integer numbers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 3$$$, $$$a_i \\ne a_{i + 1}$$$) \u2014 types of the figures.", "output_spec": "The first line should contain either the word \"Infinite\" if the number of distinct points where figures touch is infinite or \"Finite\" otherwise. If the number is finite than print it in the second line. It's guaranteed that the number fits into 32-bit integer type.", "sample_inputs": ["3\n2 1 3", "3\n1 2 3"], "sample_outputs": ["Finite\n7", "Infinite"], "notes": "NoteHere are the glorious pictures for the examples. Note that the triangle is not equilateral but just isosceles with the length of height equal to the length of base. Thus it fits into a square in a unique way.The distinct points where figures touch are marked red.In the second example the triangle and the square touch each other for the whole segment, it contains infinite number of points.  "}, "src_uid": "6c8f028f655cc77b05ed89a668273702"}
{"nl": {"description": "User ainta has a stack of n red and blue balls. He can apply a certain operation which changes the colors of the balls inside the stack.  While the top ball inside the stack is red, pop the ball from the top of the stack.  Then replace the blue ball on the top with a red ball.  And finally push some blue balls to the stack until the stack has total of n balls inside.  \u00a0If there are no blue balls inside the stack, ainta can't apply this operation. Given the initial state of the stack, ainta wants to know the maximum number of operations he can repeatedly apply.", "input_spec": "The first line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950) \u2014 the number of balls inside the stack. The second line contains a string s (|s|\u2009=\u2009n) describing the initial state of the stack. The i-th character of the string s denotes the color of the i-th ball (we'll number the balls from top to bottom of the stack). If the character is \"R\", the color is red. If the character is \"B\", the color is blue.", "output_spec": "Print the maximum number of operations ainta can repeatedly apply. Please, do not write the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specifier.", "sample_inputs": ["3\nRBR", "4\nRBBR", "5\nRBBRR"], "sample_outputs": ["2", "6", "6"], "notes": "NoteThe first example is depicted below.The explanation how user ainta applies the first operation. He pops out one red ball, changes the color of the ball in the middle from blue to red, and pushes one blue ball.  The explanation how user ainta applies the second operation. He will not pop out red balls, he simply changes the color of the ball on the top from blue to red.  From now on, ainta can't apply any operation because there are no blue balls inside the stack. ainta applied two operations, so the answer is 2.The second example is depicted below. The blue arrow denotes a single operation.  "}, "src_uid": "d86a1b5bf9fe9a985f7b030fedd29d58"}
{"nl": {"description": "Uncle Fyodor, Matroskin the Cat and Sharic the Dog live their simple but happy lives in Prostokvashino. Sometimes they receive parcels from Uncle Fyodor\u2019s parents and sometimes from anonymous benefactors, in which case it is hard to determine to which one of them the package has been sent. A photographic rifle is obviously for Sharic who loves hunting and fish is for Matroskin, but for whom was a new video game console meant? Every one of the three friends claimed that the present is for him and nearly quarreled. Uncle Fyodor had an idea how to solve the problem justly: they should suppose that the console was sent to all three of them and play it in turns. Everybody got relieved but then yet another burning problem popped up \u2014 who will play first? This time Matroskin came up with a brilliant solution, suggesting the most fair way to find it out: play rock-paper-scissors together. The rules of the game are very simple. On the count of three every player shows a combination with his hand (or paw). The combination corresponds to one of three things: a rock, scissors or paper. Some of the gestures win over some other ones according to well-known rules: the rock breaks the scissors, the scissors cut the paper, and the paper gets wrapped over the stone. Usually there are two players. Yet there are three friends, that\u2019s why they decided to choose the winner like that: If someone shows the gesture that wins over the other two players, then that player wins. Otherwise, another game round is required. Write a program that will determine the winner by the gestures they have shown.", "input_spec": "The first input line contains the name of the gesture that Uncle Fyodor showed, the second line shows which gesture Matroskin showed and the third line shows Sharic\u2019s gesture. ", "output_spec": "Print \"F\" (without quotes) if Uncle Fyodor wins. Print \"M\" if Matroskin wins and \"S\" if Sharic wins. If it is impossible to find the winner, print \"?\".", "sample_inputs": ["rock\nrock\nrock", "paper\nrock\nrock", "scissors\nrock\nrock", "scissors\npaper\nrock"], "sample_outputs": ["?", "F", "?", "?"], "notes": null}, "src_uid": "072c7d29a1b338609a72ab6b73988282"}
{"nl": {"description": "Petya is a big fan of mathematics, especially its part related to fractions. Recently he learned that a fraction  is called proper iff its numerator is smaller than its denominator (a\u2009<\u2009b) and that the fraction is called irreducible if its numerator and its denominator are coprime (they do not have positive common divisors except 1).During his free time, Petya thinks about proper irreducible fractions and converts them to decimals using the calculator. One day he mistakenly pressed addition button (\u2009+\u2009) instead of division button (\u00f7) and got sum of numerator and denominator that was equal to n instead of the expected decimal notation. Petya wanted to restore the original fraction, but soon he realized that it might not be done uniquely. That's why he decided to determine maximum possible proper irreducible fraction  such that sum of its numerator and denominator equals n. Help Petya deal with this problem. ", "input_spec": "In the only line of input there is an integer n (3\u2009\u2264\u2009n\u2009\u2264\u20091000), the sum of numerator and denominator of the fraction.", "output_spec": "Output two space-separated positive integers a and b, numerator and denominator of the maximum possible proper irreducible fraction satisfying the given sum.", "sample_inputs": ["3", "4", "12"], "sample_outputs": ["1 2", "1 3", "5 7"], "notes": null}, "src_uid": "0af3515ed98d9d01ce00546333e98e77"}
{"nl": {"description": "After seeing the \"ALL YOUR BASE ARE BELONG TO US\" meme for the first time, numbers X and Y realised that they have different bases, which complicated their relations.You're given a number X represented in base bx and a number Y represented in base by. Compare those two numbers.", "input_spec": "The first line of the input contains two space-separated integers n and bx (1\u2009\u2264\u2009n\u2009\u2264\u200910, 2\u2009\u2264\u2009bx\u2009\u2264\u200940), where n is the number of digits in the bx-based representation of X.  The second line contains n space-separated integers x1,\u2009x2,\u2009...,\u2009xn (0\u2009\u2264\u2009xi\u2009<\u2009bx) \u2014 the digits of X. They are given in the order from the most significant digit to the least significant one. The following two lines describe Y in the same way: the third line contains two space-separated integers m and by (1\u2009\u2264\u2009m\u2009\u2264\u200910, 2\u2009\u2264\u2009by\u2009\u2264\u200940, bx\u2009\u2260\u2009by), where m is the number of digits in the by-based representation of Y, and the fourth line contains m space-separated integers y1,\u2009y2,\u2009...,\u2009ym (0\u2009\u2264\u2009yi\u2009<\u2009by) \u2014 the digits of Y. There will be no leading zeroes. Both X and Y will be positive. All digits of both numbers are given in the standard decimal numeral system.", "output_spec": "Output a single character (quotes for clarity):    '<' if X\u2009<\u2009Y  '>' if X\u2009>\u2009Y  '=' if X\u2009=\u2009Y ", "sample_inputs": ["6 2\n1 0 1 1 1 1\n2 10\n4 7", "3 3\n1 0 2\n2 5\n2 4", "7 16\n15 15 4 0 0 7 10\n7 9\n4 8 0 3 1 5 0"], "sample_outputs": ["=", "<", ">"], "notes": "NoteIn the first sample, X\u2009=\u20091011112\u2009=\u20094710\u2009=\u2009Y.In the second sample, X\u2009=\u20091023\u2009=\u2009215 and Y\u2009=\u2009245\u2009=\u20091123, thus X\u2009<\u2009Y.In the third sample,  and Y\u2009=\u200948031509. We may notice that X starts with much larger digits and bx is much larger than by, so X is clearly larger than Y."}, "src_uid": "d6ab5f75a7bee28f0af2bf168a0b2e67"}
{"nl": {"description": "One day Vasya was going home when he saw a box lying on the road. The box can be represented as a rectangular parallelepiped. Vasya needed no time to realize that the box is special, as all its edges are parallel to the coordinate axes, one of its vertices is at point (0,\u20090,\u20090), and the opposite one is at point (x1,\u2009y1,\u2009z1). The six faces of the box contain some numbers a1,\u2009a2,\u2009...,\u2009a6, exactly one number right in the center of each face.  The numbers are located on the box like that:   number a1 is written on the face that lies on the ZOX plane;  a2 is written on the face, parallel to the plane from the previous point;  a3 is written on the face that lies on the XOY plane;  a4 is written on the face, parallel to the plane from the previous point;  a5 is written on the face that lies on the YOZ plane;  a6 is written on the face, parallel to the plane from the previous point. At the moment Vasya is looking at the box from point (x,\u2009y,\u2009z). Find the sum of numbers that Vasya sees. Note that all faces of the box are not transparent and Vasya can't see the numbers through the box. The picture contains transparent faces just to make it easier to perceive. You can consider that if Vasya is looking from point, lying on the plane of some face, than he can not see the number that is written on this face. It is enough to see the center of a face to see the corresponding number for Vasya. Also note that Vasya always reads correctly the ai numbers that he sees, independently of their rotation, angle and other factors (that is, for example, if Vasya sees some ai\u2009=\u20096, then he can't mistake this number for 9 and so on). ", "input_spec": "The fist input line contains three space-separated integers x, y and z (|x|,\u2009|y|,\u2009|z|\u2009\u2264\u2009106) \u2014 the coordinates of Vasya's position in space. The second line contains three space-separated integers x1, y1, z1 (1\u2009\u2264\u2009x1,\u2009y1,\u2009z1\u2009\u2264\u2009106) \u2014 the coordinates of the box's vertex that is opposite to the vertex at point (0,\u20090,\u20090). The third line contains six space-separated integers a1,\u2009a2,\u2009...,\u2009a6 (1\u2009\u2264\u2009ai\u2009\u2264\u2009106) \u2014 the numbers that are written on the box faces.  It is guaranteed that point (x,\u2009y,\u2009z) is located strictly outside the box.", "output_spec": "Print a single integer \u2014 the sum of all numbers on the box faces that Vasya sees.", "sample_inputs": ["2 2 2\n1 1 1\n1 2 3 4 5 6", "0 0 10\n3 2 3\n1 2 3 4 5 6"], "sample_outputs": ["12", "4"], "notes": "NoteThe first sample corresponds to perspective, depicted on the picture. Vasya sees numbers a2 (on the top face that is the darkest), a6 (on the right face that is the lightest) and a4 (on the left visible face).In the second sample Vasya can only see number a4."}, "src_uid": "c7889a8f64c57cf7be4df870f68f749e"}
{"nl": {"description": "Each evening after the dinner the SIS's students gather together to play the game of Sport Mafia. For the tournament, Alya puts candies into the box, which will serve as a prize for a winner. To do that, she performs $$$n$$$ actions. The first action performed is to put a single candy into the box. For each of the remaining moves she can choose from two options:  the first option, in case the box contains at least one candy, is to take exactly one candy out and eat it. This way the number of candies in the box decreased by $$$1$$$;  the second option is to put candies in the box. In this case, Alya will put $$$1$$$ more candy, than she put in the previous time. Thus, if the box is empty, then it can only use the second option.For example, one possible sequence of Alya's actions look as follows:  put one candy into the box;  put two candies into the box;  eat one candy from the box;  eat one candy from the box;  put three candies into the box;  eat one candy from the box;  put four candies into the box;  eat one candy from the box;  put five candies into the box; This way she will perform $$$9$$$ actions, the number of candies at the end will be $$$11$$$, while Alya will eat $$$4$$$ candies in total.You know the total number of actions $$$n$$$ and the number of candies at the end $$$k$$$. You need to find the total number of sweets Alya ate. That is the number of moves of the first option. It's guaranteed, that for the given $$$n$$$ and $$$k$$$ the answer always exists.Please note, that during an action of the first option, Alya takes out and eats exactly one candy.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 10^9$$$; $$$0 \\le k \\le 10^9$$$)\u00a0\u2014 the total number of moves and the number of candies in the box at the end.  It's guaranteed, that for the given $$$n$$$ and $$$k$$$ the answer exists.", "output_spec": "Print a single integer\u00a0\u2014 the number of candies, which Alya ate. Please note, that in this problem there aren't multiple possible answers\u00a0\u2014 the answer is unique for any input data. ", "sample_inputs": ["1 1", "9 11", "5 0", "3 2"], "sample_outputs": ["0", "4", "3", "1"], "notes": "NoteIn the first example, Alya has made one move only. According to the statement, the first move is always putting one candy in the box. Hence Alya ate $$$0$$$ candies.In the second example the possible sequence of Alya's actions looks as follows:   put $$$1$$$ candy,  put $$$2$$$ candies,  eat a candy,  eat a candy,  put $$$3$$$ candies,  eat a candy,  put $$$4$$$ candies,  eat a candy,  put $$$5$$$ candies.  This way, she will make exactly $$$n=9$$$ actions and in the end the box will contain $$$1+2-1-1+3-1+4-1+5=11$$$ candies. The answer is $$$4$$$, since she ate $$$4$$$ candies in total."}, "src_uid": "17b5ec1c6263ef63c668c2b903db1d77"}
{"nl": {"description": "Harry Potter lost his Invisibility Cloak, running from the school caretaker Filch. Finding an invisible object is not an easy task. Fortunately, Harry has friends who are willing to help. Hermione Granger had read \"The Invisibility Cloaks, and Everything about Them\", as well as six volumes of \"The Encyclopedia of Quick Search of Shortest Paths in Graphs, Network Flows, the Maximal Increasing Subsequences and Other Magical Objects\". She has already developed a search algorithm for the invisibility cloak in complex dynamic systems (Hogwarts is one of them).Hogwarts consists of n floors, numbered by integers from 1 to n. Some pairs of floors are connected by staircases. The staircases may change its position, moving exactly one end. Formally the situation is like this: if a staircase connects the floors a and b, then in one move it may modify its position so as to connect the floors a and c or b and c, where c is any floor different from a and b. Under no circumstances the staircase can connect a floor with itself. At the same time there can be multiple stairs between a pair of floors.Initially, Harry is on the floor with the number 1. He does not remember on what floor he has lost the cloak and wants to look for it on each of the floors. Therefore, his goal is to visit each of n floors at least once. Harry can visit the floors in any order and finish the searching at any floor.Nowadays the staircases move quite rarely. However, Ron and Hermione are willing to put a spell on any of them to help Harry find the cloak. To cause less suspicion, the three friends plan to move the staircases one by one, and no more than once for each staircase. In between shifting the staircases Harry will be able to move about the floors, reachable at the moment from the staircases, and look for his Invisibility Cloak. It is assumed that during all this time the staircases will not move spontaneously.Help the three friends to compose a searching plan. If there are several variants to solve the problem, any valid option (not necessarily the optimal one) will be accepted.", "input_spec": "The first line contains integers n and m (1\u2009\u2264\u2009n\u2009\u2264\u2009100000, 0\u2009\u2264\u2009m\u2009\u2264\u2009200000), which are the number of floors and staircases in Hogwarts, respectively. The following m lines contain pairs of floors connected by staircases at the initial moment of time.", "output_spec": "In the first line print \"YES\" (without the quotes) if Harry is able to search all the floors, and \"NO\" otherwise. If the answer is positive, then print on the second line the number of staircases that Ron and Hermione will have to shift. Further output should look like this: Harry's moves  a staircase's move  Harry's moves a staircase's move ... a staircase's move Harry's moves Each \"Harry's move\" should be represented as a list of floors in the order in which they have been visited. The total amount of elements of these lists must not exceed 106. When you print each list, first print the number of elements in it, and then in the same line print the actual space-separated elements. The first number in the first list should be the number 1 (the floor, from which Harry begins to search). Any list except the first one might contain the zero number of elements. Note that Harry can visit some floors again, but must visit all n floors at least once. Two consecutively visited floors must be directly connected by a staircase (at the time Harry goes from one of them to the other one). No two floors that are visited consequtively can be equal. In the description of a \"staircase's move\" indicate the number of staircase (the staircases are numbered from 1 to m in the order in which they are given in the input data) and its new location (two numbers of the connected floors in any order). Any staircase can be moved at most once. If there are several solutions, output any.", "sample_inputs": ["6 4\n1 2\n1 3\n2 3\n4 5", "4 1\n1 2", "5 5\n1 2\n1 3\n3 4\n3 5\n4 5"], "sample_outputs": ["YES\n2\n3 1 2 3\n2 3 5\n3 5 4 5\n4 5 6\n3 6 5 3", "NO", "YES\n0\n6 1 2 1 3 4 5"], "notes": null}, "src_uid": "35a3513c8fe730a64f30c5daec27df05"}
{"nl": {"description": "Our bear's forest has a checkered field. The checkered field is an n\u2009\u00d7\u2009n table, the rows are numbered from 1 to n from top to bottom, the columns are numbered from 1 to n from left to right. Let's denote a cell of the field on the intersection of row x and column y by record (x,\u2009y). Each cell of the field contains growing raspberry, at that, the cell (x,\u2009y) of the field contains x\u2009+\u2009y raspberry bushes.The bear came out to walk across the field. At the beginning of the walk his speed is (dx,\u2009dy). Then the bear spends exactly t seconds on the field. Each second the following takes place:  Let's suppose that at the current moment the bear is in cell (x,\u2009y).  First the bear eats the raspberry from all the bushes he has in the current cell. After the bear eats the raspberry from k bushes, he increases each component of his speed by k. In other words, if before eating the k bushes of raspberry his speed was (dx,\u2009dy), then after eating the berry his speed equals (dx\u2009+\u2009k,\u2009dy\u2009+\u2009k).  Let's denote the current speed of the bear (dx,\u2009dy) (it was increased after the previous step). Then the bear moves from cell (x,\u2009y) to cell (((x\u2009+\u2009dx\u2009-\u20091)\u00a0mod\u00a0n)\u2009+\u20091,\u2009((y\u2009+\u2009dy\u2009-\u20091)\u00a0mod\u00a0n)\u2009+\u20091).  Then one additional raspberry bush grows in each cell of the field. You task is to predict the bear's actions. Find the cell he ends up in if he starts from cell (sx,\u2009sy). Assume that each bush has infinitely much raspberry and the bear will never eat all of it.", "input_spec": "The first line of the input contains six space-separated integers: n, sx, sy, dx, dy, t (1\u2009\u2264\u2009n\u2009\u2264\u2009109;\u00a01\u2009\u2264\u2009sx,\u2009sy\u2009\u2264\u2009n;\u00a0\u2009-\u2009100\u2009\u2264\u2009dx,\u2009dy\u2009\u2264\u2009100;\u00a00\u2009\u2264\u2009t\u2009\u2264\u20091018).", "output_spec": "Print two integers \u2014 the coordinates of the cell the bear will end up in after t seconds.", "sample_inputs": ["5 1 2 0 1 2", "1 1 1 -1 -1 2"], "sample_outputs": ["3 1", "1 1"], "notes": "NoteOperation a\u00a0mod\u00a0b means taking the remainder after dividing a by b. Note that the result of the operation is always non-negative. For example, (\u2009-\u20091)\u00a0mod\u00a03\u2009=\u20092.In the first sample before the first move the speed vector will equal (3,4) and the bear will get to cell (4,1). Before the second move the speed vector will equal (9,10) and he bear will get to cell (3,1). Don't forget that at the second move, the number of berry bushes increased by 1.In the second sample before the first move the speed vector will equal (1,1) and the bear will get to cell (1,1). Before the second move, the speed vector will equal (4,4) and the bear will get to cell (1,1). Don't forget that at the second move, the number of berry bushes increased by 1."}, "src_uid": "ee9fa8be2ae05a4e831a4f608c0cc785"}
{"nl": {"description": "Linda likes to change her hair color from time to time, and would be pleased if her boyfriend Archie would notice the difference between the previous and the new color. Archie always comments on Linda's hair color if and only if he notices a difference \u2014 so Linda always knows whether Archie has spotted the difference or not.There is a new hair dye series in the market where all available colors are numbered by integers from $$$1$$$ to $$$N$$$ such that a smaller difference of the numerical values also means less visual difference.Linda assumes that for these series there should be some critical color difference $$$C$$$ ($$$1 \\le C \\le N$$$) for which Archie will notice color difference between the current color $$$\\mathrm{color}_{\\mathrm{new}}$$$ and the previous color $$$\\mathrm{color}_{\\mathrm{prev}}$$$ if $$$\\left|\\mathrm{color}_{\\mathrm{new}} - \\mathrm{color}_{\\mathrm{prev}}\\right| \\ge C$$$ and will not if $$$\\left|\\mathrm{color}_{\\mathrm{new}} - \\mathrm{color}_{\\mathrm{prev}}\\right| < C$$$.Now she has bought $$$N$$$ sets of hair dye from the new series \u2014 one for each of the colors from $$$1$$$ to $$$N$$$, and is ready to set up an experiment. Linda will change her hair color on a regular basis and will observe Archie's reaction \u2014 whether he will notice the color change or not. Since for the proper dye each set should be used completely, each hair color can be obtained no more than once.Before the experiment, Linda was using a dye from a different series which is not compatible with the new one, so for the clearness of the experiment Archie's reaction to the first used color is meaningless.Her aim is to find the precise value of $$$C$$$ in a limited number of dyes. Write a program which finds the value of $$$C$$$ by experimenting with the given $$$N$$$ colors and observing Archie's reactions to color changes.", "input_spec": null, "output_spec": null, "sample_inputs": ["1\n\n7\n\n1\n\n1\n\n0\n\n0\n\n1"], "sample_outputs": ["? 2\n\n? 7\n\n? 4\n\n? 1\n\n? 5\n\n= 4"], "notes": "NoteComments to the example input line by line:   $$$N = 7$$$.  Answer to the first query is meaningless (can also be $$$0$$$).  $$$C \\leq 5$$$.  $$$3 < C \\leq 5$$$. It would be wise to check difference $$$4$$$. However, this can not be done in the next query since $$$4 + 4 = 8$$$ and $$$4 - 4 = 0$$$ both are outside the allowed interval $$$1 \\le P \\le 7$$$.  $$$3 < C \\leq 5$$$.  $$$3 < C \\leq 4$$$. Therefore, $$$C = 4$$$. "}, "src_uid": "5a374c06b44a843233d9cf64a38c7e55"}
{"nl": {"description": "In order to put away old things and welcome a fresh new year, a thorough cleaning of the house is a must.Little Tommy finds an old polynomial and cleaned it up by taking it modulo another. But now he regrets doing this...Given two integers p and k, find a polynomial f(x) with non-negative integer coefficients strictly less than k, whose remainder is p when divided by (x\u2009+\u2009k). That is, f(x)\u2009=\u2009q(x)\u00b7(x\u2009+\u2009k)\u2009+\u2009p, where q(x) is a polynomial (not necessarily with integer coefficients).", "input_spec": "The only line of input contains two space-separated integers p and k (1\u2009\u2264\u2009p\u2009\u2264\u20091018, 2\u2009\u2264\u2009k\u2009\u2264\u20092\u2009000).", "output_spec": "If the polynomial does not exist, print a single integer -1, or output two lines otherwise. In the first line print a non-negative integer d \u2014 the number of coefficients in the polynomial. In the second line print d space-separated integers a0,\u2009a1,\u2009...,\u2009ad\u2009-\u20091, describing a polynomial  fulfilling the given requirements. Your output should satisfy 0\u2009\u2264\u2009ai\u2009<\u2009k for all 0\u2009\u2264\u2009i\u2009\u2264\u2009d\u2009-\u20091, and ad\u2009-\u20091\u2009\u2260\u20090. If there are many possible solutions, print any of them.", "sample_inputs": ["46 2", "2018 214"], "sample_outputs": ["7\n0 1 0 0 1 1 1", "3\n92 205 1"], "notes": "NoteIn the first example, f(x)\u2009=\u2009x6\u2009+\u2009x5\u2009+\u2009x4\u2009+\u2009x\u2009=\u2009(x5\u2009-\u2009x4\u2009+\u20093x3\u2009-\u20096x2\u2009+\u200912x\u2009-\u200923)\u00b7(x\u2009+\u20092)\u2009+\u200946.In the second example, f(x)\u2009=\u2009x2\u2009+\u2009205x\u2009+\u200992\u2009=\u2009(x\u2009-\u20099)\u00b7(x\u2009+\u2009214)\u2009+\u20092018."}, "src_uid": "f4dbaa8deb2bd5c054fe34bb83bc6cd5"}
{"nl": {"description": "InputThe only line of input contains three integers a1,\u2009a2,\u2009a3 (1\u2009\u2264\u2009a1,\u2009a2,\u2009a3\u2009\u2264\u200920), separated by spaces.OutputOutput a single integer.ExamplesInput2 3 2Output5Input13 14 1Output14Input14 5 9Output464Input17 18 3Output53", "input_spec": "The only line of input contains three integers a1,\u2009a2,\u2009a3 (1\u2009\u2264\u2009a1,\u2009a2,\u2009a3\u2009\u2264\u200920), separated by spaces.", "output_spec": "Output a single integer.", "sample_inputs": ["2 3 2", "13 14 1", "14 5 9", "17 18 3"], "sample_outputs": ["5", "14", "464", "53"], "notes": null}, "src_uid": "6ff30f5a9afc3f7befca813469188aab"}
{"nl": {"description": "This problem consists of three subproblems: for solving subproblem C1 you will receive 4 points, for solving subproblem C2 you will receive 4 points, and for solving subproblem C3 you will receive 8 points.Manao decided to pursue a fighter's career. He decided to begin with an ongoing tournament. Before Manao joined, there were n contestants in the tournament, numbered from 1 to n. Each of them had already obtained some amount of tournament points, namely the i-th fighter had pi points.Manao is going to engage in a single fight against each contestant. Each of Manao's fights ends in either a win or a loss. A win grants Manao one point, and a loss grants Manao's opponent one point. For each i, Manao estimated the amount of effort ei he needs to invest to win against the i-th contestant. Losing a fight costs no effort.After Manao finishes all of his fights, the ranklist will be determined, with 1 being the best rank and n\u2009+\u20091 being the worst. The contestants will be ranked in descending order of their tournament points. The contestants with the same number of points as Manao will be ranked better than him if they won the match against him and worse otherwise. The exact mechanism of breaking ties for other fighters is not relevant here.Manao's objective is to have rank k or better. Determine the minimum total amount of effort he needs to invest in order to fulfill this goal, if it is possible.", "input_spec": "The first line contains a pair of integers n and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009+\u20091). The i-th of the following n lines contains two integers separated by a single space \u2014 pi and ei (0\u2009\u2264\u2009pi,\u2009ei\u2009\u2264\u2009200000). The problem consists of three subproblems. The subproblems have different constraints on the input. You will get some score for the correct submission of the subproblem. The description of the subproblems follows.   In subproblem C1 (4 points), the constraint 1\u2009\u2264\u2009n\u2009\u2264\u200915 will hold.  In subproblem C2 (4 points), the constraint 1\u2009\u2264\u2009n\u2009\u2264\u2009100 will hold.  In subproblem C3 (8 points), the constraint 1\u2009\u2264\u2009n\u2009\u2264\u2009200000 will hold. ", "output_spec": "Print a single number in a single line \u2014 the minimum amount of effort Manao needs to use to rank in the top k. If no amount of effort can earn Manao such a rank, output number -1.", "sample_inputs": ["3 2\n1 1\n1 4\n2 2", "2 1\n3 2\n4 0", "5 2\n2 10\n2 10\n1 1\n3 1\n3 1"], "sample_outputs": ["3", "-1", "12"], "notes": "NoteConsider the first test case. At the time when Manao joins the tournament, there are three fighters. The first of them has 1 tournament point and the victory against him requires 1 unit of effort. The second contestant also has 1 tournament point, but Manao needs 4 units of effort to defeat him. The third contestant has 2 points and victory against him costs Manao 2 units of effort. Manao's goal is top be in top 2. The optimal decision is to win against fighters 1 and 3, after which Manao, fighter 2, and fighter 3 will all have 2 points. Manao will rank better than fighter 3 and worse than fighter 2, thus finishing in second place.Consider the second test case. Even if Manao wins against both opponents, he will still rank third."}, "src_uid": "19a098cef100fc3652c59abf7c373814"}
{"nl": {"description": "Each student eagerly awaits the day he would pass the exams successfully. Thus, Vasya was ready to celebrate, but, alas, he didn't pass it. However, many of Vasya's fellow students from the same group were more successful and celebrated after the exam.Some of them celebrated in the BugDonalds restaurant, some of them\u00a0\u2014 in the BeaverKing restaurant, the most successful ones were fast enough to celebrate in both of restaurants. Students which didn't pass the exam didn't celebrate in any of those restaurants and elected to stay home to prepare for their reexamination. However, this quickly bored Vasya and he started checking celebration photos on the Kilogramm. He found out that, in total, BugDonalds was visited by $$$A$$$ students, BeaverKing\u00a0\u2014 by $$$B$$$ students and $$$C$$$ students visited both restaurants. Vasya also knows that there are $$$N$$$ students in his group.Based on this info, Vasya wants to determine either if his data contradicts itself or, if it doesn't, how many students in his group didn't pass the exam. Can you help him so he won't waste his valuable preparation time?", "input_spec": "The first line contains four integers\u00a0\u2014 $$$A$$$, $$$B$$$, $$$C$$$ and $$$N$$$ ($$$0 \\leq A, B, C, N \\leq 100$$$).", "output_spec": "If a distribution of $$$N$$$ students exists in which $$$A$$$ students visited BugDonalds, $$$B$$$ \u2014 BeaverKing, $$$C$$$ \u2014 both of the restaurants and at least one student is left home (it is known that Vasya didn't pass the exam and stayed at home), output one integer\u00a0\u2014 amount of students (including Vasya) who did not pass the exam.  If such a distribution does not exist and Vasya made a mistake while determining the numbers $$$A$$$, $$$B$$$, $$$C$$$ or $$$N$$$ (as in samples 2 and 3), output $$$-1$$$.", "sample_inputs": ["10 10 5 20", "2 2 0 4", "2 2 2 1"], "sample_outputs": ["5", "-1", "-1"], "notes": "NoteThe first sample describes following situation: $$$5$$$ only visited BugDonalds, $$$5$$$ students only visited BeaverKing, $$$5$$$ visited both of them and $$$5$$$ students (including Vasya) didn't pass the exam.In the second sample $$$2$$$ students only visited BugDonalds and $$$2$$$ only visited BeaverKing, but that means all $$$4$$$ students in group passed the exam which contradicts the fact that Vasya didn't pass meaning that this situation is impossible.The third sample describes a situation where $$$2$$$ students visited BugDonalds but the group has only $$$1$$$ which makes it clearly impossible."}, "src_uid": "959d56affbe2ff5dd999a7e8729f60ce"}
{"nl": {"description": "You are given three sticks with positive integer lengths of a,\u2009b, and c centimeters. You can increase length of some of them by some positive integer number of centimeters (different sticks can be increased by a different length), but in total by at most l centimeters. In particular, it is allowed not to increase the length of any stick.Determine the number of ways to increase the lengths of some sticks so that you can form from them a non-degenerate (that is, having a positive area) triangle. Two ways are considered different, if the length of some stick is increased by different number of centimeters in them.", "input_spec": "The single line contains 4 integers a,\u2009b,\u2009c,\u2009l (1\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u20093\u00b7105, 0\u2009\u2264\u2009l\u2009\u2264\u20093\u00b7105).", "output_spec": "Print a single integer \u2014 the number of ways to increase the sizes of the sticks by the total of at most l centimeters, so that you can make a non-degenerate triangle from it.", "sample_inputs": ["1 1 1 2", "1 2 3 1", "10 2 1 7"], "sample_outputs": ["4", "2", "0"], "notes": "NoteIn the first sample test you can either not increase any stick or increase any two sticks by 1 centimeter.In the second sample test you can increase either the first or the second stick by one centimeter. Note that the triangle made from the initial sticks is degenerate and thus, doesn't meet the conditions."}, "src_uid": "185ff90a8b0ae0e2b75605f772589410"}
{"nl": {"description": "Natasha is planning an expedition to Mars for $$$n$$$ people. One of the important tasks is to provide food for each participant.The warehouse has $$$m$$$ daily food packages. Each package has some food type $$$a_i$$$.Each participant must eat exactly one food package each day. Due to extreme loads, each participant must eat the same food type throughout the expedition. Different participants may eat different (or the same) types of food.Formally, for each participant $$$j$$$ Natasha should select his food type $$$b_j$$$ and each day $$$j$$$-th participant will eat one food package of type $$$b_j$$$. The values $$$b_j$$$ for different participants may be different.What is the maximum possible number of days the expedition can last, following the requirements above?", "input_spec": "The first line contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n \\le 100$$$, $$$1 \\le m \\le 100$$$)\u00a0\u2014 the number of the expedition participants and the number of the daily food packages available. The second line contains sequence of integers $$$a_1, a_2, \\dots, a_m$$$ ($$$1 \\le a_i \\le 100$$$), where $$$a_i$$$ is the type of $$$i$$$-th food package.", "output_spec": "Print the single integer\u00a0\u2014 the number of days the expedition can last. If it is not possible to plan the expedition for even one day, print 0.", "sample_inputs": ["4 10\n1 5 2 1 1 1 2 5 7 2", "100 1\n1", "2 5\n5 4 3 2 1", "3 9\n42 42 42 42 42 42 42 42 42"], "sample_outputs": ["2", "0", "1", "3"], "notes": "NoteIn the first example, Natasha can assign type $$$1$$$ food to the first participant, the same type $$$1$$$ to the second, type $$$5$$$ to the third and type $$$2$$$ to the fourth. In this case, the expedition can last for $$$2$$$ days, since each participant can get two food packages of his food type (there will be used $$$4$$$ packages of type $$$1$$$, two packages of type $$$2$$$ and two packages of type $$$5$$$).In the second example, there are $$$100$$$ participants and only $$$1$$$ food package. In this case, the expedition can't last even $$$1$$$ day."}, "src_uid": "b7ef696a11ff96f2e9c31becc2ff50fe"}
{"nl": {"description": "You can not just take the file and send it. When Polycarp trying to send a file in the social network \"Codehorses\", he encountered an unexpected problem. If the name of the file contains three or more \"x\" (lowercase Latin letters \"x\") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.Determine the minimum number of characters to remove from the file name so after that the name does not contain \"xxx\" as a substring. Print 0 if the file name does not initially contain a forbidden substring \"xxx\".You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by $$$1$$$. For example, if you delete the character in the position $$$2$$$ from the string \"exxxii\", then the resulting string is \"exxii\".", "input_spec": "The first line contains integer $$$n$$$ $$$(3 \\le n \\le 100)$$$ \u2014 the length of the file name. The second line contains a string of length $$$n$$$ consisting of lowercase Latin letters only \u2014 the file name.", "output_spec": "Print the minimum number of characters to remove from the file name so after that the name does not contain \"xxx\" as a substring. If initially the file name dost not contain a forbidden substring \"xxx\", print 0.", "sample_inputs": ["6\nxxxiii", "5\nxxoxx", "10\nxxxxxxxxxx"], "sample_outputs": ["1", "0", "8"], "notes": "NoteIn the first example Polycarp tried to send a file with name contains number $$$33$$$, written in Roman numerals. But he can not just send the file, because it name contains three letters \"x\" in a row. To send the file he needs to remove any one of this letters."}, "src_uid": "8de14db41d0acee116bd5d8079cb2b02"}
{"nl": {"description": "Alexander is learning how to convert numbers from the decimal system to any other, however, he doesn't know English letters, so he writes any number only as a decimal number, it means that instead of the letter A he will write the number 10. Thus, by converting the number 475 from decimal to hexadecimal system, he gets 11311 (475\u2009=\u20091\u00b7162\u2009+\u200913\u00b7161\u2009+\u200911\u00b7160). Alexander lived calmly until he tried to convert the number back to the decimal number system.Alexander remembers that he worked with little numbers so he asks to find the minimum decimal number so that by converting it to the system with the base n he will get the number k.", "input_spec": "The first line contains the integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009109). The second line contains the integer k (0\u2009\u2264\u2009k\u2009<\u20091060), it is guaranteed that the number k contains no more than 60 symbols. All digits in the second line are strictly less than n. Alexander guarantees that the answer exists and does not exceed 1018. The number k doesn't contain leading zeros.", "output_spec": "Print the number x (0\u2009\u2264\u2009x\u2009\u2264\u20091018)\u00a0\u2014 the answer to the problem.", "sample_inputs": ["13\n12", "16\n11311", "20\n999", "17\n2016"], "sample_outputs": ["12", "475", "3789", "594"], "notes": "NoteIn the first example 12 could be obtained by converting two numbers to the system with base 13: 12\u2009=\u200912\u00b7130 or 15\u2009=\u20091\u00b7131\u2009+\u20092\u00b7130."}, "src_uid": "be66399c558c96566a6bb0a63d2503e5"}
{"nl": {"description": "Mister B once received a gift: it was a book about aliens, which he started read immediately. This book had c pages.At first day Mister B read v0 pages, but after that he started to speed up. Every day, starting from the second, he read a pages more than on the previous day (at first day he read v0 pages, at second\u00a0\u2014 v0\u2009+\u2009a pages, at third\u00a0\u2014 v0\u2009+\u20092a pages, and so on). But Mister B is just a human, so he physically wasn't able to read more than v1 pages per day.Also, to refresh his memory, every day, starting from the second, Mister B had to reread last l pages he read on the previous day. Mister B finished the book when he read the last page for the first time.Help Mister B to calculate how many days he needed to finish the book.", "input_spec": "First and only line contains five space-separated integers: c, v0, v1, a and l (1\u2009\u2264\u2009c\u2009\u2264\u20091000, 0\u2009\u2264\u2009l\u2009<\u2009v0\u2009\u2264\u2009v1\u2009\u2264\u20091000, 0\u2009\u2264\u2009a\u2009\u2264\u20091000) \u2014 the length of the book in pages, the initial reading speed, the maximum reading speed, the acceleration in reading speed and the number of pages for rereading.", "output_spec": "Print one integer \u2014 the number of days Mister B needed to finish the book.", "sample_inputs": ["5 5 10 5 4", "12 4 12 4 1", "15 1 100 0 0"], "sample_outputs": ["1", "3", "15"], "notes": "NoteIn the first sample test the book contains 5 pages, so Mister B read it right at the first day.In the second sample test at first day Mister B read pages number 1\u2009-\u20094, at second day\u00a0\u2014 4\u2009-\u200911, at third day\u00a0\u2014 11\u2009-\u200912 and finished the book.In third sample test every day Mister B read 1 page of the book, so he finished in 15 days."}, "src_uid": "b743110117ce13e2090367fd038d3b50"}
{"nl": {"description": "There is a very secret base in Potatoland where potato mash is made according to a special recipe. The neighbours from Porridgia decided to seize this recipe and to sell it to Pilauland. For this mission they have been preparing special agent Pearlo for many years. When, finally, Pearlo learned all secrets of espionage, he penetrated into the Potatoland territory and reached the secret base.Now he is standing at the entrance, but to get inside he need to pass combination lock. Minute ago one of the workers entered the password on the terminal and opened the door. The terminal is a square digital keyboard 3\u2009\u00d7\u20093 with digits from 1 to 9.Pearlo knows that the password consists from distinct digits and is probably symmetric with respect to the central button of the terminal. He has heat sensor which allowed him to detect the digits which the worker pressed. Now he wants to check whether the password entered by the worker is symmetric with respect to the central button of the terminal. This fact can Help Pearlo to reduce the number of different possible password combinations.", "input_spec": "Input contains the matrix of three rows of three symbols each. Symbol \u00abX\u00bb means that the corresponding button was pressed, and \u00ab.\u00bb means that is was not pressed. The matrix may contain no \u00abX\u00bb, also it may contain no \u00ab.\u00bb.", "output_spec": "Print YES if the password is symmetric with respect to the central button of the terminal and NO otherwise.", "sample_inputs": ["XX.\n...\n.XX", "X.X\nX..\n..."], "sample_outputs": ["YES", "NO"], "notes": "NoteIf you are not familiar with the term \u00abcentral symmetry\u00bb, you may look into http://en.wikipedia.org/wiki/Central_symmetry"}, "src_uid": "6a5fe5fac8a4e3993dc3423180cdd6a9"}
{"nl": {"description": "Mikhail walks on a 2D plane. He can go either up or right. You are given a sequence of Mikhail's moves. He thinks that this sequence is too long and he wants to make it as short as possible.In the given sequence moving up is described by character U and moving right is described by character R. Mikhail can replace any pair of consecutive moves RU or UR with a diagonal move (described as character D). After that, he can go on and do some other replacements, until there is no pair of consecutive moves RU or UR left.Your problem is to print the minimum possible length of the sequence of moves after the replacements.", "input_spec": "The first line of the input contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the length of the sequence. The second line contains the sequence consisting of n characters U and R.", "output_spec": "Print the minimum possible length of the sequence of moves after all replacements are done.", "sample_inputs": ["5\nRUURU", "17\nUUURRRRRUUURURUUU"], "sample_outputs": ["3", "13"], "notes": "NoteIn the first test the shortened sequence of moves may be DUD (its length is 3).In the second test the shortened sequence of moves can be UUDRRRDUDDUUU (its length is 13)."}, "src_uid": "986ae418ce82435badadb0bd5588f45b"}
{"nl": {"description": "Polycarp has a cat and his cat is a real gourmet! Dependent on a day of the week he eats certain type of food:  on Mondays, Thursdays and Sundays he eats fish food;  on Tuesdays and Saturdays he eats rabbit stew;  on other days of week he eats chicken stake. Polycarp plans to go on a trip and already packed his backpack. His backpack contains:  $$$a$$$ daily rations of fish food;  $$$b$$$ daily rations of rabbit stew;  $$$c$$$ daily rations of chicken stakes. Polycarp has to choose such day of the week to start his trip that his cat can eat without additional food purchases as long as possible. Print the maximum number of days the cat can eat in a trip without additional food purchases, if Polycarp chooses the day of the week to start his trip optimally.", "input_spec": "The first line of the input contains three positive integers $$$a$$$, $$$b$$$ and $$$c$$$ ($$$1 \\le a, b, c \\le 7\\cdot10^8$$$) \u2014 the number of daily rations of fish food, rabbit stew and chicken stakes in Polycarps backpack correspondingly.", "output_spec": "Print the maximum number of days the cat can eat in a trip without additional food purchases, if Polycarp chooses the day of the week to start his trip optimally.", "sample_inputs": ["2 1 1", "3 2 2", "1 100 1", "30 20 10"], "sample_outputs": ["4", "7", "3", "39"], "notes": "NoteIn the first example the best day for start of the trip is Sunday. In this case, during Sunday and Monday the cat will eat fish food, during Tuesday \u2014 rabbit stew and during Wednesday \u2014 chicken stake. So, after four days of the trip all food will be eaten.In the second example Polycarp can start his trip in any day of the week. In any case there are food supplies only for one week in Polycarps backpack.In the third example Polycarp can start his trip in any day, excluding Wednesday, Saturday and Sunday. In this case, the cat will eat three different dishes in three days. Nevertheless that after three days of a trip there will be $$$99$$$ portions of rabbit stew in a backpack, can cannot eat anything in fourth day of a trip."}, "src_uid": "e17df52cc0615585e4f8f2d31d2daafb"}
{"nl": {"description": "A girl named Xenia has a cupboard that looks like an arc from ahead. The arc is made of a semicircle with radius r (the cupboard's top) and two walls of height h (the cupboard's sides). The cupboard's depth is r, that is, it looks like a rectangle with base r and height h\u2009+\u2009r from the sides. The figure below shows what the cupboard looks like (the front view is on the left, the side view is on the right).  Xenia got lots of balloons for her birthday. The girl hates the mess, so she wants to store the balloons in the cupboard. Luckily, each balloon is a sphere with radius . Help Xenia calculate the maximum number of balloons she can put in her cupboard. You can say that a balloon is in the cupboard if you can't see any part of the balloon on the left or right view. The balloons in the cupboard can touch each other. It is not allowed to squeeze the balloons or deform them in any way. You can assume that the cupboard's walls are negligibly thin.", "input_spec": "The single line contains two integers r,\u2009h (1\u2009\u2264\u2009r,\u2009h\u2009\u2264\u2009107).", "output_spec": "Print a single integer \u2014 the maximum number of balloons Xenia can put in the cupboard.", "sample_inputs": ["1 1", "1 2", "2 1"], "sample_outputs": ["3", "5", "2"], "notes": null}, "src_uid": "ae883bf16842c181ea4bd123dee12ef9"}
{"nl": {"description": "You have n problems. You have estimated the difficulty of the i-th one as integer ci. Now you want to prepare a problemset for a contest, using some of the problems you've made.A problemset for the contest must consist of at least two problems. You think that the total difficulty of the problems of the contest must be at least l and at most r. Also, you think that the difference between difficulties of the easiest and the hardest of the chosen problems must be at least x.Find the number of ways to choose a problemset for the contest.", "input_spec": "The first line contains four integers n, l, r, x (1\u2009\u2264\u2009n\u2009\u2264\u200915, 1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009109, 1\u2009\u2264\u2009x\u2009\u2264\u2009106) \u2014 the number of problems you have, the minimum and maximum value of total difficulty of the problemset and the minimum difference in difficulty between the hardest problem in the pack and the easiest one, respectively. The second line contains n integers c1,\u2009c2,\u2009...,\u2009cn (1\u2009\u2264\u2009ci\u2009\u2264\u2009106) \u2014 the difficulty of each problem.", "output_spec": "Print the number of ways to choose a suitable problemset for the contest. ", "sample_inputs": ["3 5 6 1\n1 2 3", "4 40 50 10\n10 20 30 25", "5 25 35 10\n10 10 20 10 20"], "sample_outputs": ["2", "2", "6"], "notes": "NoteIn the first example two sets are suitable, one consisting of the second and third problem, another one consisting of all three problems.In the second example, two sets of problems are suitable \u2014 the set of problems with difficulties 10 and 30 as well as the set of problems with difficulties 20 and 30.In the third example any set consisting of one problem of difficulty 10 and one problem of difficulty 20 is suitable."}, "src_uid": "0d43104a0de924cdcf8e4aced5aa825d"}
{"nl": {"description": "Vasya plays the sleuth with his friends. The rules of the game are as follows: those who play for the first time, that is Vasya is the sleuth, he should investigate a \"crime\" and find out what is happening. He can ask any questions whatsoever that can be answered with \"Yes\" or \"No\". All the rest agree beforehand to answer the questions like that: if the question\u2019s last letter is a vowel, they answer \"Yes\" and if the last letter is a consonant, they answer \"No\". Of course, the sleuth knows nothing about it and his task is to understand that.Unfortunately, Vasya is not very smart. After 5 hours of endless stupid questions everybody except Vasya got bored. That\u2019s why Vasya\u2019s friends ask you to write a program that would give answers instead of them.The English alphabet vowels are: A, E, I, O, U, YThe English alphabet consonants are: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Z", "input_spec": "The single line contains a question represented by a non-empty line consisting of large and small Latin letters, spaces and a question mark. The line length does not exceed 100. It is guaranteed that the question mark occurs exactly once in the line \u2014 as the last symbol and that the line contains at least one letter.", "output_spec": "Print answer for the question in a single line: YES if the answer is \"Yes\", NO if the answer is \"No\". Remember that in the reply to the question the last letter, not the last character counts. I. e. the spaces and the question mark do not count as letters.", "sample_inputs": ["Is it a melon?", "Is it an apple?", "Is     it a banana ?", "Is   it an apple  and a  banana   simultaneouSLY?"], "sample_outputs": ["NO", "YES", "YES", "YES"], "notes": null}, "src_uid": "dea7eb04e086a4c1b3924eff255b9648"}
{"nl": {"description": "After playing Neo in the legendary \"Matrix\" trilogy, Keanu Reeves started doubting himself: maybe we really live in virtual reality? To find if this is true, he needs to solve the following problem.Let's call a string consisting of only zeroes and ones good if it contains different numbers of zeroes and ones. For example, 1, 101, 0000 are good, while 01, 1001, and 111000 are not good.We are given a string $$$s$$$ of length $$$n$$$ consisting of only zeroes and ones. We need to cut $$$s$$$ into minimal possible number of substrings $$$s_1, s_2, \\ldots, s_k$$$ such that all of them are good. More formally, we have to find minimal by number of strings sequence of good strings $$$s_1, s_2, \\ldots, s_k$$$ such that their concatenation (joining) equals $$$s$$$, i.e. $$$s_1 + s_2 + \\dots + s_k = s$$$.For example, cuttings 110010 into 110 and 010 or into 11 and 0010 are valid, as 110, 010, 11, 0010 are all good, and we can't cut 110010 to the smaller number of substrings as 110010 isn't good itself. At the same time, cutting of 110010 into 1100 and 10 isn't valid as both strings aren't good. Also, cutting of 110010 into 1, 1, 0010 isn't valid, as it isn't minimal, even though all $$$3$$$ strings are good.Can you help Keanu? We can show that the solution always exists. If there are multiple optimal answers, print any.", "input_spec": "The first line of the input contains a single integer $$$n$$$ ($$$1\\le n \\le 100$$$)\u00a0\u2014 the length of the string $$$s$$$. The second line contains the string $$$s$$$ of length $$$n$$$ consisting only from zeros and ones.", "output_spec": "In the first line, output a single integer $$$k$$$ ($$$1\\le k$$$)\u00a0\u2014 a minimal number of strings you have cut $$$s$$$ into. In the second line, output $$$k$$$ strings $$$s_1, s_2, \\ldots, s_k$$$ separated with spaces. The length of each string has to be positive. Their concatenation has to be equal to $$$s$$$ and all of them have to be good. If there are multiple answers, print any.", "sample_inputs": ["1\n1", "2\n10", "6\n100011"], "sample_outputs": ["1\n1", "2\n1 0", "2\n100 011"], "notes": "NoteIn the first example, the string 1 wasn't cut at all. As it is good, the condition is satisfied.In the second example, 1 and 0 both are good. As 10 isn't good, the answer is indeed minimal.In the third example, 100 and 011 both are good. As 100011 isn't good, the answer is indeed minimal."}, "src_uid": "4ebed264d40a449602a26ceef2e849d1"}
{"nl": {"description": "Right now she actually isn't. But she will be, if you don't solve this problem.You are given integers n, k, A and B. There is a number x, which is initially equal to n. You are allowed to perform two types of operations:   Subtract 1 from x. This operation costs you A coins.  Divide x by k. Can be performed only if x is divisible by k. This operation costs you B coins.  What is the minimum amount of coins you have to pay to make x equal to 1?", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20092\u00b7109). The second line contains a single integer k (1\u2009\u2264\u2009k\u2009\u2264\u20092\u00b7109). The third line contains a single integer A (1\u2009\u2264\u2009A\u2009\u2264\u20092\u00b7109). The fourth line contains a single integer B (1\u2009\u2264\u2009B\u2009\u2264\u20092\u00b7109).", "output_spec": "Output a single integer\u00a0\u2014 the minimum amount of coins you have to pay to make x equal to 1.", "sample_inputs": ["9\n2\n3\n1", "5\n5\n2\n20", "19\n3\n4\n2"], "sample_outputs": ["6", "8", "12"], "notes": "NoteIn the first testcase, the optimal strategy is as follows:   Subtract 1 from x (9\u2009\u2192\u20098) paying 3 coins.  Divide x by 2 (8\u2009\u2192\u20094) paying 1 coin.  Divide x by 2 (4\u2009\u2192\u20092) paying 1 coin.  Divide x by 2 (2\u2009\u2192\u20091) paying 1 coin. The total cost is 6 coins.In the second test case the optimal strategy is to subtract 1 from x 4 times paying 8 coins in total."}, "src_uid": "f838fae7c98bf51cfa0b9bd158650b10"}
{"nl": {"description": "There is an old tradition of keeping 4 boxes of candies in the house in Cyberland. The numbers of candies are special if their arithmetic mean, their median and their range are all equal. By definition, for a set {x1,\u2009x2,\u2009x3,\u2009x4} (x1\u2009\u2264\u2009x2\u2009\u2264\u2009x3\u2009\u2264\u2009x4) arithmetic mean is , median is  and range is x4\u2009-\u2009x1. The arithmetic mean and median are not necessary integer. It is well-known that if those three numbers are same, boxes will create a \"debugging field\" and codes in the field will have no bugs.For example, 1,\u20091,\u20093,\u20093 is the example of 4 numbers meeting the condition because their mean, median and range are all equal to 2.Jeff has 4 special boxes of candies. However, something bad has happened! Some of the boxes could have been lost and now there are only n (0\u2009\u2264\u2009n\u2009\u2264\u20094) boxes remaining. The i-th remaining box contains ai candies.Now Jeff wants to know: is there a possible way to find the number of candies of the 4\u2009-\u2009n missing boxes, meeting the condition above (the mean, median and range are equal)?", "input_spec": "The first line of input contains an only integer n (0\u2009\u2264\u2009n\u2009\u2264\u20094). The next n lines contain integers ai, denoting the number of candies in the i-th box (1\u2009\u2264\u2009ai\u2009\u2264\u2009500).", "output_spec": "In the first output line, print \"YES\" if a solution exists, or print \"NO\" if there is no solution. If a solution exists, you should output 4\u2009-\u2009n more lines, each line containing an integer b, denoting the number of candies in a missing box. All your numbers b must satisfy inequality 1\u2009\u2264\u2009b\u2009\u2264\u2009106. It is guaranteed that if there exists a positive integer solution, you can always find such b's meeting the condition. If there are multiple answers, you are allowed to print any of them. Given numbers ai may follow in any order in the input, not necessary in non-decreasing. ai may have stood at any positions in the original set, not necessary on lowest n first positions.", "sample_inputs": ["2\n1\n1", "3\n1\n1\n1", "4\n1\n2\n2\n3"], "sample_outputs": ["YES\n3\n3", "NO", "YES"], "notes": "NoteFor the first sample, the numbers of candies in 4 boxes can be 1,\u20091,\u20093,\u20093. The arithmetic mean, the median and the range of them are all 2.For the second sample, it's impossible to find the missing number of candies.In the third example no box has been lost and numbers satisfy the condition.You may output b in any order."}, "src_uid": "230e613abf0f6a768829cbc1f1a09219"}
{"nl": {"description": "You are given a rectangular board of M\u2009\u00d7\u2009N squares. Also you are given an unlimited number of standard domino pieces of 2\u2009\u00d7\u20091 squares. You are allowed to rotate the pieces. You are asked to place as many dominoes as possible on the board so as to meet the following conditions:1. Each domino completely covers two squares.2. No two dominoes overlap.3. Each domino lies entirely inside the board. It is allowed to touch the edges of the board.Find the maximum number of dominoes, which can be placed under these restrictions.", "input_spec": "In a single line you are given two integers M and N \u2014 board sizes in squares (1\u2009\u2264\u2009M\u2009\u2264\u2009N\u2009\u2264\u200916).", "output_spec": "Output one number \u2014 the maximal number of dominoes, which can be placed.", "sample_inputs": ["2 4", "3 3"], "sample_outputs": ["4", "4"], "notes": null}, "src_uid": "e840e7bfe83764bee6186fcf92a1b5cd"}
{"nl": {"description": "Let's assume that we have a pair of numbers (a,\u2009b). We can get a new pair (a\u2009+\u2009b,\u2009b) or (a,\u2009a\u2009+\u2009b) from the given pair in a single step.Let the initial pair of numbers be (1,1). Your task is to find number k, that is, the least number of steps needed to transform (1,1) into the pair where at least one number equals n.", "input_spec": "The input contains the only integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009106).", "output_spec": "Print the only integer k.", "sample_inputs": ["5", "1"], "sample_outputs": ["3", "0"], "notes": "NoteThe pair (1,1) can be transformed into a pair containing 5 in three moves: (1,1) \u2009\u2192\u2009 (1,2) \u2009\u2192\u2009 (3,2) \u2009\u2192\u2009 (5,2)."}, "src_uid": "75739f77378b21c331b46b1427226fa1"}
{"nl": {"description": "A frog is initially at position $$$0$$$ on the number line. The frog has two positive integers $$$a$$$ and $$$b$$$. From a position $$$k$$$, it can either jump to position $$$k+a$$$ or $$$k-b$$$.Let $$$f(x)$$$ be the number of distinct integers the frog can reach if it never jumps on an integer outside the interval $$$[0, x]$$$. The frog doesn't need to visit all these integers in one trip, that is, an integer is counted if the frog can somehow reach it if it starts from $$$0$$$.Given an integer $$$m$$$, find $$$\\sum_{i=0}^{m} f(i)$$$. That is, find the sum of all $$$f(i)$$$ for $$$i$$$ from $$$0$$$ to $$$m$$$.", "input_spec": "The first line contains three integers $$$m, a, b$$$ ($$$1 \\leq m \\leq 10^9, 1 \\leq a,b \\leq 10^5$$$).", "output_spec": "Print a single integer, the desired sum.", "sample_inputs": ["7 5 3", "1000000000 1 2019", "100 100000 1", "6 4 5"], "sample_outputs": ["19", "500000001500000001", "101", "10"], "notes": "NoteIn the first example, we must find $$$f(0)+f(1)+\\ldots+f(7)$$$. We have $$$f(0) = 1, f(1) = 1, f(2) = 1, f(3) = 1, f(4) = 1, f(5) = 3, f(6) = 3, f(7) = 8$$$. The sum of these values is $$$19$$$.In the second example, we have $$$f(i) = i+1$$$, so we want to find $$$\\sum_{i=0}^{10^9} i+1$$$.In the third example, the frog can't make any jumps in any case."}, "src_uid": "d6290b69eddfcf5f131cc9e612ccab76"}
{"nl": {"description": " The number \"zero\" is called \"love\" (or \"l'oeuf\" to be precise, literally means \"egg\" in French), for example when denoting the zero score in a game of tennis. Aki is fond of numbers, especially those with trailing zeros. For example, the number $$$9200$$$ has two trailing zeros. Aki thinks the more trailing zero digits a number has, the prettier it is.However, Aki believes, that the number of trailing zeros of a number is not static, but depends on the base (radix) it is represented in. Thus, he considers a few scenarios with some numbers and bases. And now, since the numbers he used become quite bizarre, he asks you to help him to calculate the beauty of these numbers.Given two integers $$$n$$$ and $$$b$$$ (in decimal notation), your task is to calculate the number of trailing zero digits in the $$$b$$$-ary (in the base/radix of $$$b$$$) representation of $$$n\\,!$$$ (factorial of $$$n$$$). ", "input_spec": "The only line of the input contains two integers $$$n$$$ and $$$b$$$ ($$$1 \\le n \\le 10^{18}$$$, $$$2 \\le b \\le 10^{12}$$$).", "output_spec": "Print an only integer\u00a0\u2014 the number of trailing zero digits in the $$$b$$$-ary representation of $$$n!$$$", "sample_inputs": ["6 9", "38 11", "5 2", "5 10"], "sample_outputs": ["1", "3", "3", "1"], "notes": "NoteIn the first example, $$$6!_{(10)} = 720_{(10)} = 880_{(9)}$$$.In the third and fourth example, $$$5!_{(10)} = 120_{(10)} = 1111000_{(2)}$$$.The representation of the number $$$x$$$ in the $$$b$$$-ary base is $$$d_1, d_2, \\ldots, d_k$$$ if $$$x = d_1 b^{k - 1} + d_2 b^{k - 2} + \\ldots + d_k b^0$$$, where $$$d_i$$$ are integers and $$$0 \\le d_i \\le b - 1$$$. For example, the number $$$720$$$ from the first example is represented as $$$880_{(9)}$$$ since $$$720 = 8 \\cdot 9^2 + 8 \\cdot 9 + 0 \\cdot 1$$$.You can read more about bases here."}, "src_uid": "491748694c1a53771be69c212a5e0e25"}
{"nl": {"description": "Little Petya has recently started attending a programming club. Naturally he is facing the problem of choosing a programming language. After long considerations he realized that Java is the best choice. The main argument in favor of choosing Java was that it has a very large integer data type, called BigInteger.But having attended several classes of the club, Petya realized that not all tasks require using the BigInteger type. It turned out that in some tasks it is much easier to use small data types. That's why a question arises: \"Which integer type to use if one wants to store a positive integer n?\"Petya knows only 5 integer types:1) byte occupies 1 byte and allows you to store numbers from \u2009-\u2009128 to 1272) short occupies 2 bytes and allows you to store numbers from \u2009-\u200932768 to 327673) int occupies 4 bytes and allows you to store numbers from \u2009-\u20092147483648 to 21474836474) long occupies 8 bytes and allows you to store numbers from \u2009-\u20099223372036854775808 to 92233720368547758075) BigInteger can store any integer number, but at that it is not a primitive type, and operations with it are much slower.For all the types given above the boundary values are included in the value range.From this list, Petya wants to choose the smallest type that can store a positive integer n. Since BigInteger works much slower, Peter regards it last. Help him.", "input_spec": "The first line contains a positive number n. It consists of no more than 100 digits and doesn't contain any leading zeros. The number n can't be represented as an empty string. Please, do not use %lld specificator to read or write 64-bit integers in C++. It is preffered to use cout (also you may use %I64d).", "output_spec": "Print the first type from the list \"byte, short, int, long, BigInteger\", that can store the natural number n, in accordance with the data given above.", "sample_inputs": ["127", "130", "123456789101112131415161718192021222324"], "sample_outputs": ["byte", "short", "BigInteger"], "notes": null}, "src_uid": "33041f1832fa7f641e37c4c638ab08a1"}
{"nl": {"description": "You are given a positive integer $$$n$$$.Let $$$S(x)$$$ be sum of digits in base 10 representation of $$$x$$$, for example, $$$S(123) = 1 + 2 + 3 = 6$$$, $$$S(0) = 0$$$.Your task is to find two integers $$$a, b$$$, such that $$$0 \\leq a, b \\leq n$$$, $$$a + b = n$$$ and $$$S(a) + S(b)$$$ is the largest possible among all such pairs.", "input_spec": "The only line of input contains an integer $$$n$$$ $$$(1 \\leq n \\leq 10^{12})$$$.", "output_spec": "Print largest $$$S(a) + S(b)$$$ among all pairs of integers $$$a, b$$$, such that $$$0 \\leq a, b \\leq n$$$ and $$$a + b = n$$$.", "sample_inputs": ["35", "10000000000"], "sample_outputs": ["17", "91"], "notes": "NoteIn the first example, you can choose, for example, $$$a = 17$$$ and $$$b = 18$$$, so that $$$S(17) + S(18) = 1 + 7 + 1 + 8 = 17$$$. It can be shown that it is impossible to get a larger answer.In the second test example, you can choose, for example, $$$a = 5000000001$$$ and $$$b = 4999999999$$$, with $$$S(5000000001) + S(4999999999) = 91$$$. It can be shown that it is impossible to get a larger answer."}, "src_uid": "5c61b4a4728070b9de49d72831cd2329"}
{"nl": {"description": "Lengths are measures in Baden in inches and feet. To a length from centimeters it is enough to know that an inch equals three centimeters in Baden and one foot contains 12 inches.You are given a length equal to n centimeters. Your task is to convert it to feet and inches so that the number of feet was maximum. The result should be an integer rounded to the closest value containing an integral number of inches.Note that when you round up, 1 cm rounds up to 0 inches and 2 cm round up to 1 inch.", "input_spec": "The only line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u200910000).", "output_spec": "Print two non-negative space-separated integers a and b, where a is the numbers of feet and b is the number of inches.", "sample_inputs": ["42", "5"], "sample_outputs": ["1 2", "0 2"], "notes": null}, "src_uid": "5d4f38ffd1849862623325fdbe06cd00"}
{"nl": {"description": "You've got a positive integer sequence a1,\u2009a2,\u2009...,\u2009an. All numbers in the sequence are distinct. Let's fix the set of variables b1,\u2009b2,\u2009...,\u2009bm. Initially each variable bi (1\u2009\u2264\u2009i\u2009\u2264\u2009m) contains the value of zero. Consider the following sequence, consisting of n operations.The first operation is assigning the value of a1 to some variable bx (1\u2009\u2264\u2009x\u2009\u2264\u2009m). Each of the following n\u2009-\u20091 operations is assigning to some variable by the value that is equal to the sum of values that are stored in the variables bi and bj (1\u2009\u2264\u2009i,\u2009j,\u2009y\u2009\u2264\u2009m). At that, the value that is assigned on the t-th operation, must equal at. For each operation numbers y,\u2009i,\u2009j are chosen anew.Your task is to find the minimum number of variables m, such that those variables can help you perform the described sequence of operations.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u200923). The second line contains n space-separated integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ak\u2009\u2264\u2009109). It is guaranteed that all numbers in the sequence are distinct.", "output_spec": "In a single line print a single number \u2014 the minimum number of variables m, such that those variables can help you perform the described sequence of operations. If you cannot perform the sequence of operations at any m, print -1.", "sample_inputs": ["5\n1 2 3 6 8", "3\n3 6 5", "6\n2 4 8 6 10 18"], "sample_outputs": ["2", "-1", "3"], "notes": "NoteIn the first sample, you can use two variables b1 and b2 to perform the following sequence of operations.  b1 := 1;  b2 := b1\u2009+\u2009b1;  b1 := b1\u2009+\u2009b2;  b1 := b1\u2009+\u2009b1;  b1 := b1\u2009+\u2009b2. "}, "src_uid": "359f5d1264ce16c5c5293fd59db95628"}
{"nl": {"description": "Vitya has just started learning Berlanese language. It is known that Berlanese uses the Latin alphabet. Vowel letters are \"a\", \"o\", \"u\", \"i\", and \"e\". Other letters are consonant.In Berlanese, there has to be a vowel after every consonant, but there can be any letter after any vowel. The only exception is a consonant \"n\"; after this letter, there can be any letter (not only a vowel) or there can be no letter at all. For example, the words \"harakiri\", \"yupie\", \"man\", and \"nbo\" are Berlanese while the words \"horse\", \"king\", \"my\", and \"nz\" are not.Help Vitya find out if a word $$$s$$$ is Berlanese.", "input_spec": "The first line of the input contains the string $$$s$$$ consisting of $$$|s|$$$ ($$$1\\leq |s|\\leq 100$$$) lowercase Latin letters.", "output_spec": "Print \"YES\" (without quotes) if there is a vowel after every consonant except \"n\", otherwise print \"NO\". You can print each letter in any case (upper or lower).", "sample_inputs": ["sumimasen", "ninja", "codeforces"], "sample_outputs": ["YES", "YES", "NO"], "notes": "NoteIn the first and second samples, a vowel goes after each consonant except \"n\", so the word is Berlanese.In the third sample, the consonant \"c\" goes after the consonant \"r\", and the consonant \"s\" stands on the end, so the word is not Berlanese."}, "src_uid": "a83144ba7d4906b7692456f27b0ef7d4"}
{"nl": {"description": "We'll define S(n) for positive integer n as follows: the number of the n's digits in the decimal base. For example, S(893)\u2009=\u20093, S(114514)\u2009=\u20096.You want to make a consecutive integer sequence starting from number m (m,\u2009m\u2009+\u20091,\u2009...). But you need to pay S(n)\u00b7k to add the number n to the sequence.You can spend a cost up to w, and you want to make the sequence as long as possible. Write a program that tells sequence's maximum length.", "input_spec": "The first line contains three integers w (1\u2009\u2264\u2009w\u2009\u2264\u20091016), m (1\u2009\u2264\u2009m\u2009\u2264\u20091016), k (1\u2009\u2264\u2009k\u2009\u2264\u2009109). Please, do not write the %lld specifier to read or write 64-bit integers in C++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "The first line should contain a single integer \u2014 the answer to the problem.", "sample_inputs": ["9 1 1", "77 7 7", "114 5 14", "1 1 2"], "sample_outputs": ["9", "7", "6", "0"], "notes": null}, "src_uid": "8ef8a09e33d38a2d7f023316bc38b6ea"}
{"nl": {"description": "You've got a rectangular table with length a and width b and the infinite number of plates of radius r. Two players play the following game: they take turns to put the plates on the table so that the plates don't lie on each other (but they can touch each other), and so that any point on any plate is located within the table's border. During the game one cannot move the plates that already lie on the table. The player who cannot make another move loses. Determine which player wins, the one who moves first or the one who moves second, provided that both players play optimally well.", "input_spec": "A single line contains three space-separated integers a, b, r (1\u2009\u2264\u2009a,\u2009b,\u2009r\u2009\u2264\u2009100) \u2014 the table sides and the plates' radius, correspondingly.", "output_spec": "If wins the player who moves first, print \"First\" (without the quotes). Otherwise print \"Second\" (without the quotes).", "sample_inputs": ["5 5 2", "6 7 4"], "sample_outputs": ["First", "Second"], "notes": "NoteIn the first sample the table has place for only one plate. The first player puts a plate on the table, the second player can't do that and loses.  In the second sample the table is so small that it doesn't have enough place even for one plate. So the first player loses without making a single move.  "}, "src_uid": "90b9ef939a13cf29715bc5bce26c9896"}
{"nl": {"description": "Ivan's classes at the university have just finished, and now he wants to go to the local CFK cafe and eat some fried chicken.CFK sells chicken chunks in small and large portions. A small portion contains 3 chunks; a large one \u2014 7 chunks. Ivan wants to eat exactly x chunks. Now he wonders whether he can buy exactly this amount of chicken.Formally, Ivan wants to know if he can choose two non-negative integers a and b in such a way that a small portions and b large ones contain exactly x chunks.Help Ivan to answer this question for several values of x!", "input_spec": "The first line contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of testcases. The i-th of the following n lines contains one integer xi (1\u2009\u2264\u2009xi\u2009\u2264\u2009100) \u2014 the number of chicken chunks Ivan wants to eat.", "output_spec": "Print n lines, in i-th line output YES if Ivan can buy exactly xi chunks. Otherwise, print NO.", "sample_inputs": ["2\n6\n5"], "sample_outputs": ["YES\nNO"], "notes": "NoteIn the first example Ivan can buy two small portions.In the second example Ivan cannot buy exactly 5 chunks, since one small portion is not enough, but two small portions or one large is too much."}, "src_uid": "cfd1182be98fb5f0c426f8b68e48d452"}
{"nl": {"description": "You are solving the crossword problem K from IPSC 2014. You solved all the clues except for one: who does Eevee evolve into? You are not very into pokemons, but quick googling helped you find out, that Eevee can evolve into eight different pokemons: Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, and Sylveon.You know the length of the word in the crossword, and you already know some letters. Designers of the crossword made sure that the answer is unambiguous, so you can assume that exactly one pokemon out of the 8 that Eevee evolves into fits the length and the letters given. Your task is to find it.", "input_spec": "First line contains an integer n (6\u2009\u2264\u2009n\u2009\u2264\u20098) \u2013 the length of the string. Next line contains a string consisting of n characters, each of which is either a lower case english letter (indicating a known letter) or a dot character (indicating an empty cell in the crossword).", "output_spec": "Print a name of the pokemon that Eevee can evolve into that matches the pattern in the input. Use lower case letters only to print the name (in particular, do not capitalize the first letter).", "sample_inputs": ["7\nj......", "7\n...feon", "7\n.l.r.o."], "sample_outputs": ["jolteon", "leafeon", "flareon"], "notes": "NoteHere's a set of names in a form you can paste into your solution:[\"vaporeon\", \"jolteon\", \"flareon\", \"espeon\", \"umbreon\", \"leafeon\", \"glaceon\", \"sylveon\"]{\"vaporeon\", \"jolteon\", \"flareon\", \"espeon\", \"umbreon\", \"leafeon\", \"glaceon\", \"sylveon\"}"}, "src_uid": "ec3d15ff198d1e4ab9fd04dd3b12e6c0"}
{"nl": {"description": "The gym leaders were fascinated by the evolutions which took place at Felicity camp. So, they were curious to know about the secret behind evolving Pokemon. The organizers of the camp gave the gym leaders a PokeBlock, a sequence of n ingredients. Each ingredient can be of type 0 or 1. Now the organizers told the gym leaders that to evolve a Pokemon of type k (k\u2009\u2265\u20092), they need to make a valid set of k cuts on the PokeBlock to get smaller blocks.Suppose the given PokeBlock sequence is b0b1b2... bn\u2009-\u20091. You have a choice of making cuts at n\u2009+\u20091 places, i.e., Before b0, between b0 and b1, between b1 and b2, ..., between bn\u2009-\u20092 and bn\u2009-\u20091, and after bn\u2009-\u20091.The n\u2009+\u20091 choices of making cuts are as follows (where a | denotes a possible cut):| b0 | b1 | b2 | ... | bn\u2009-\u20092 | bn\u2009-\u20091 |Consider a sequence of k cuts. Now each pair of consecutive cuts will contain a binary string between them, formed from the ingredient types. The ingredients before the first cut and after the last cut are wasted, which is to say they are not considered. So there will be exactly k\u2009-\u20091 such binary substrings. Every substring can be read as a binary number. Let m be the maximum number out of the obtained numbers. If all the obtained numbers are positive and the set of the obtained numbers contains all integers from 1 to m, then this set of cuts is said to be a valid set of cuts.For example, suppose the given PokeBlock sequence is 101101001110 and we made 5 cuts in the following way:10 | 11 | 010 | 01 | 1 | 10So the 4 binary substrings obtained are: 11, 010, 01 and 1, which correspond to the numbers 3, 2, 1 and 1 respectively. Here m\u2009=\u20093, as it is the maximum value among the obtained numbers. And all the obtained numbers are positive and we have obtained all integers from 1 to m. Hence this set of cuts is a valid set of 5 cuts.A Pokemon of type k will evolve only if the PokeBlock is cut using a valid set of k cuts. There can be many valid sets of the same size. Two valid sets of k cuts are considered different if there is a cut in one set which is not there in the other set.Let f(k) denote the number of valid sets of k cuts. Find the value of . Since the value of s can be very large, output s modulo 109\u2009+\u20097.", "input_spec": "The input consists of two lines. The first line consists an integer n (1\u2009\u2264\u2009n\u2009\u2264\u200975)\u00a0\u2014 the length of the PokeBlock. The next line contains the PokeBlock, a binary string of length n.", "output_spec": "Output a single integer, containing the answer to the problem, i.e., the value of s modulo 109\u2009+\u20097.", "sample_inputs": ["4\n1011", "2\n10"], "sample_outputs": ["10", "1"], "notes": "NoteIn the first sample, the sets of valid cuts are:Size 2: |1|011, 1|01|1, 10|1|1, 101|1|.Size 3: |1|01|1, |10|1|1, 10|1|1|, 1|01|1|.Size 4: |10|1|1|, |1|01|1|.Hence, f(2)\u2009=\u20094, f(3)\u2009=\u20094 and f(4)\u2009=\u20092. So, the value of s\u2009=\u200910.In the second sample, the set of valid cuts is:Size 2: |1|0.Hence, f(2)\u2009=\u20091 and f(3)\u2009=\u20090. So, the value of s\u2009=\u20091."}, "src_uid": "61f88159762cbc7c51c36e7b56ecde48"}
{"nl": {"description": "There are n cities in Bearland, numbered 1 through n. Cities are arranged in one long row. The distance between cities i and j is equal to |i\u2009-\u2009j|.Limak is a police officer. He lives in a city a. His job is to catch criminals. It's hard because he doesn't know in which cities criminals are. Though, he knows that there is at most one criminal in each city.Limak is going to use a BCD (Bear Criminal Detector). The BCD will tell Limak how many criminals there are for every distance from a city a. After that, Limak can catch a criminal in each city for which he is sure that there must be a criminal.You know in which cities criminals are. Count the number of criminals Limak will catch, after he uses the BCD.", "input_spec": "The first line of the input contains two integers n and a (1\u2009\u2264\u2009a\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of cities and the index of city where Limak lives. The second line contains n integers t1,\u2009t2,\u2009...,\u2009tn (0\u2009\u2264\u2009ti\u2009\u2264\u20091). There are ti criminals in the i-th city.", "output_spec": "Print the number of criminals Limak will catch.", "sample_inputs": ["6 3\n1 1 1 0 1 0", "5 2\n0 0 0 1 0"], "sample_outputs": ["3", "1"], "notes": "NoteIn the first sample, there are six cities and Limak lives in the third one (blue arrow below). Criminals are in cities marked red.  Using the BCD gives Limak the following information:  There is one criminal at distance 0 from the third city\u00a0\u2014 Limak is sure that this criminal is exactly in the third city.  There is one criminal at distance 1 from the third city\u00a0\u2014 Limak doesn't know if a criminal is in the second or fourth city.  There are two criminals at distance 2 from the third city\u00a0\u2014 Limak is sure that there is one criminal in the first city and one in the fifth city.  There are zero criminals for every greater distance. So, Limak will catch criminals in cities 1, 3 and 5, that is 3 criminals in total.In the second sample (drawing below), the BCD gives Limak the information that there is one criminal at distance 2 from Limak's city. There is only one city at distance 2 so Limak is sure where a criminal is.  "}, "src_uid": "4840d571d4ce6e1096bb678b6c100ae5"}
{"nl": {"description": "Running with barriers on the circle track is very popular in the country where Dasha lives, so no wonder that on her way to classes she saw the following situation:The track is the circle with length L, in distinct points of which there are n barriers. Athlete always run the track in counterclockwise direction if you look on him from above. All barriers are located at integer distance from each other along the track. Her friends the parrot Kefa and the leopard Sasha participated in competitions and each of them ran one lap. Each of the friends started from some integral point on the track. Both friends wrote the distance from their start along the track to each of the n barriers. Thus, each of them wrote n integers in the ascending order, each of them was between 0 and L\u2009-\u20091, inclusively.    Consider an example. Let L\u2009=\u20098, blue points are barriers, and green points are Kefa's start (A) and Sasha's start (B). Then Kefa writes down the sequence [2,\u20094,\u20096], and Sasha writes down [1,\u20095,\u20097]. There are several tracks in the country, all of them have same length and same number of barriers, but the positions of the barriers can differ among different tracks. Now Dasha is interested if it is possible that Kefa and Sasha ran the same track or they participated on different tracks. Write the program which will check that Kefa's and Sasha's tracks coincide (it means that one can be obtained from the other by changing the start position). Note that they always run the track in one direction \u2014 counterclockwise, if you look on a track from above. ", "input_spec": "The first line contains two integers n and L (1\u2009\u2264\u2009n\u2009\u2264\u200950, n\u2009\u2264\u2009L\u2009\u2264\u2009100) \u2014 the number of barriers on a track and its length.  The second line contains n distinct integers in the ascending order \u2014 the distance from Kefa's start to each barrier in the order of its appearance. All integers are in the range from 0 to L\u2009-\u20091 inclusively. The second line contains n distinct integers in the ascending order \u2014 the distance from Sasha's start to each barrier in the order of its overcoming. All integers are in the range from 0 to L\u2009-\u20091 inclusively.", "output_spec": "Print \"YES\" (without quotes), if Kefa and Sasha ran the coinciding tracks (it means that the position of all barriers coincides, if they start running from the same points on the track). Otherwise print \"NO\" (without quotes).", "sample_inputs": ["3 8\n2 4 6\n1 5 7", "4 9\n2 3 5 8\n0 1 3 6", "2 4\n1 3\n1 2"], "sample_outputs": ["YES", "YES", "NO"], "notes": "NoteThe first test is analyzed in the statement."}, "src_uid": "3d931684ca11fe6141c6461e85d91d63"}
{"nl": {"description": "Recently Adaltik discovered japanese crosswords. Japanese crossword is a picture, represented as a table sized a\u2009\u00d7\u2009b squares, and each square is colored white or black. There are integers to the left of the rows and to the top of the columns, encrypting the corresponding row or column. The number of integers represents how many groups of black squares there are in corresponding row or column, and the integers themselves represents the number of consecutive black squares in corresponding group (you can find more detailed explanation in Wikipedia https://en.wikipedia.org/wiki/Japanese_crossword).Adaltik decided that the general case of japanese crossword is too complicated and drew a row consisting of n squares (e.g. japanese crossword sized 1\u2009\u00d7\u2009n), which he wants to encrypt in the same way as in japanese crossword.    The example of encrypting of a single row of japanese crossword. Help Adaltik find the numbers encrypting the row he drew.", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the length of the row. The second line of the input contains a single string consisting of n characters 'B' or 'W', ('B' corresponds to black square, 'W'\u00a0\u2014 to white square in the row that Adaltik drew).", "output_spec": "The first line should contain a single integer k\u00a0\u2014 the number of integers encrypting the row, e.g. the number of groups of black squares in the row. The second line should contain k integers, encrypting the row, e.g. corresponding to sizes of groups of consecutive black squares in the order from left to right.", "sample_inputs": ["3\nBBW", "5\nBWBWB", "4\nWWWW", "4\nBBBB", "13\nWBBBBWWBWBBBW"], "sample_outputs": ["1\n2", "3\n1 1 1", "0", "1\n4", "3\n4 1 3"], "notes": "NoteThe last sample case correspond to the picture in the statement."}, "src_uid": "e4b3a2707ba080b93a152f4e6e983973"}
{"nl": {"description": "The city park of IT City contains n east to west paths and n north to south paths. Each east to west path crosses each north to south path, so there are n2 intersections.The city funded purchase of five benches. To make it seems that there are many benches it was decided to place them on as many paths as possible. Obviously this requirement is satisfied by the following scheme: each bench is placed on a cross of paths and each path contains not more than one bench.Help the park administration count the number of ways to place the benches.", "input_spec": "The only line of the input contains one integer n (5\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of east to west paths and north to south paths.", "output_spec": "Output one integer \u2014 the number of ways to place the benches.", "sample_inputs": ["5"], "sample_outputs": ["120"], "notes": null}, "src_uid": "92db14325cd8aee06b502c12d2e3dd81"}
{"nl": {"description": "Vasya is an active Internet user. One day he came across an Internet resource he liked, so he wrote its address in the notebook. We know that the address of the written resource has format: <protocol>://<domain>.ru[/<context>] where:  <protocol> can equal either \"http\" (without the quotes) or \"ftp\" (without the quotes),  <domain> is a non-empty string, consisting of lowercase English letters,  the /<context> part may not be present. If it is present, then <context> is a non-empty string, consisting of lowercase English letters. If string <context> isn't present in the address, then the additional character \"/\" isn't written. Thus, the address has either two characters \"/\" (the ones that go before the domain), or three (an extra one in front of the context).When the boy came home, he found out that the address he wrote in his notebook had no punctuation marks. Vasya must have been in a lot of hurry and didn't write characters \":\", \"/\", \".\".Help Vasya to restore the possible address of the recorded Internet resource.", "input_spec": "The first line contains a non-empty string that Vasya wrote out in his notebook. This line consists of lowercase English letters only.  It is guaranteed that the given string contains at most 50 letters. It is guaranteed that the given string can be obtained from some correct Internet resource address, described above.", "output_spec": "Print a single line \u2014 the address of the Internet resource that Vasya liked. If there are several addresses that meet the problem limitations, you are allowed to print any of them.", "sample_inputs": ["httpsunrux", "ftphttprururu"], "sample_outputs": ["http://sun.ru/x", "ftp://http.ru/ruru"], "notes": "NoteIn the second sample there are two more possible answers: \"ftp://httpruru.ru\" and \"ftp://httpru.ru/ru\"."}, "src_uid": "4c999b7854a8a08960b6501a90b3bba3"}
{"nl": {"description": "Meg the Rabbit decided to do something nice, specifically \u2014 to determine the shortest distance between two points on the surface of our planet. But Meg... what can you say, she wants everything simple. So, she already regards our planet as a two-dimensional circle. No, wait, it's even worse \u2014 as a square of side n. Thus, the task has been reduced to finding the shortest path between two dots on a square (the path should go through the square sides). To simplify the task let us consider the vertices of the square to lie at points whose coordinates are: (0,\u20090), (n,\u20090), (0,\u2009n) and (n,\u2009n).", "input_spec": "The single line contains 5 space-separated integers: n,\u2009x1,\u2009y1,\u2009x2,\u2009y2 (1\u2009\u2264\u2009n\u2009\u2264\u20091000,\u20090\u2009\u2264\u2009x1,\u2009y1,\u2009x2,\u2009y2\u2009\u2264\u2009n) which correspondingly represent a side of the square, the coordinates of the first point and the coordinates of the second point. It is guaranteed that the points lie on the sides of the square.", "output_spec": "You must print on a single line the shortest distance between the points.", "sample_inputs": ["2 0 0 1 0", "2 0 1 2 1", "100 0 0 100 100"], "sample_outputs": ["1", "4", "200"], "notes": null}, "src_uid": "685fe16c217b5b71eafdb4198822250e"}
{"nl": {"description": "The princess is going to escape the dragon's cave, and she needs to plan it carefully.The princess runs at vp miles per hour, and the dragon flies at vd miles per hour. The dragon will discover the escape after t hours and will chase the princess immediately. Looks like there's no chance to success, but the princess noticed that the dragon is very greedy and not too smart. To delay him, the princess decides to borrow a couple of bijous from his treasury. Once the dragon overtakes the princess, she will drop one bijou to distract him. In this case he will stop, pick up the item, return to the cave and spend f hours to straighten the things out in the treasury. Only after this will he resume the chase again from the very beginning.The princess is going to run on the straight. The distance between the cave and the king's castle she's aiming for is c miles. How many bijous will she need to take from the treasury to be able to reach the castle? If the dragon overtakes the princess at exactly the same moment she has reached the castle, we assume that she reached the castle before the dragon reached her, and doesn't need an extra bijou to hold him off.", "input_spec": "The input data contains integers vp,\u2009vd,\u2009t,\u2009f and c, one per line (1\u2009\u2264\u2009vp,\u2009vd\u2009\u2264\u2009100, 1\u2009\u2264\u2009t,\u2009f\u2009\u2264\u200910, 1\u2009\u2264\u2009c\u2009\u2264\u20091000).", "output_spec": "Output the minimal number of bijous required for the escape to succeed.", "sample_inputs": ["1\n2\n1\n1\n10", "1\n2\n1\n1\n8"], "sample_outputs": ["2", "1"], "notes": "NoteIn the first case one hour after the escape the dragon will discover it, and the princess will be 1 mile away from the cave. In two hours the dragon will overtake the princess 2 miles away from the cave, and she will need to drop the first bijou. Return to the cave and fixing the treasury will take the dragon two more hours; meanwhile the princess will be 4 miles away from the cave. Next time the dragon will overtake the princess 8 miles away from the cave, and she will need the second bijou, but after this she will reach the castle without any further trouble.The second case is similar to the first one, but the second time the dragon overtakes the princess when she has reached the castle, and she won't need the second bijou."}, "src_uid": "c9c03666278acec35f0e273691fe0fff"}
{"nl": {"description": "qd ucyhf yi q fhycu dkcruh mxeiu huluhiu yi q tyvvuhudj fhycu dkcruh. oekh jqia yi je vydt jxu djx ucyhf.", "input_spec": "jxu ydfkj sediyiji ev q iydwbu ydjuwuh d (1\u2009\u2264\u2009d\u2009\u2264\u200911184) \u2014 jxu edu-rqiut ydtun ev jxu ucyhf je vydt.", "output_spec": "ekjfkj q iydwbu dkcruh.", "sample_inputs": ["1"], "sample_outputs": ["13"], "notes": null}, "src_uid": "53879e79cccbacfa6586d40cf3436657"}
{"nl": {"description": "Every summer Vitya comes to visit his grandmother in the countryside. This summer, he got a huge wart. Every grandma knows that one should treat warts when the moon goes down. Thus, Vitya has to catch the moment when the moon is down.Moon cycle lasts 30 days. The size of the visible part of the moon (in Vitya's units) for each day is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, and then cycle repeats, thus after the second 1 again goes 0.As there is no internet in the countryside, Vitya has been watching the moon for n consecutive days and for each of these days he wrote down the size of the visible part of the moon. Help him find out whether the moon will be up or down next day, or this cannot be determined by the data he has.", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200992)\u00a0\u2014 the number of consecutive days Vitya was watching the size of the visible part of the moon.  The second line contains n integers ai (0\u2009\u2264\u2009ai\u2009\u2264\u200915)\u00a0\u2014 Vitya's records. It's guaranteed that the input data is consistent.", "output_spec": "If Vitya can be sure that the size of visible part of the moon on day n\u2009+\u20091 will be less than the size of the visible part on day n, then print \"DOWN\" at the only line of the output. If he might be sure that the size of the visible part will increase, then print \"UP\". If it's impossible to determine what exactly will happen with the moon, print -1.", "sample_inputs": ["5\n3 4 5 6 7", "7\n12 13 14 15 14 13 12", "1\n8"], "sample_outputs": ["UP", "DOWN", "-1"], "notes": "NoteIn the first sample, the size of the moon on the next day will be equal to 8, thus the answer is \"UP\".In the second sample, the size of the moon on the next day will be 11, thus the answer is \"DOWN\".In the third sample, there is no way to determine whether the size of the moon on the next day will be 7 or 9, thus the answer is -1."}, "src_uid": "8330d9fea8d50a79741507b878da0a75"}
{"nl": {"description": "IT City company developing computer games invented a new way to reward its employees. After a new game release users start buying it actively, and the company tracks the number of sales with precision to each transaction. Every time when the next number of sales is divisible by all numbers from 2 to 10 every developer of this game gets a small bonus.A game designer Petya knows that the company is just about to release a new game that was partly developed by him. On the basis of his experience he predicts that n people will buy the game during the first month. Now Petya wants to determine how many times he will get the bonus. Help him to know it.", "input_spec": "The only line of the input contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091018) \u2014 the prediction on the number of people who will buy the game.", "output_spec": "Output one integer showing how many numbers from 1 to n are divisible by all numbers from 2 to 10.", "sample_inputs": ["3000"], "sample_outputs": ["1"], "notes": null}, "src_uid": "8551308e5ff435e0fc507b89a912408a"}
{"nl": {"description": "You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't contain leading zeroes.Your task is to determine if it is possible in this case to remove some of the digits (possibly not remove any digit at all) so that the result contains at least one digit, forms a non-negative integer, doesn't have leading zeroes and is divisible by 8. After the removing, it is forbidden to rearrange the digits.If a solution exists, you should print it.", "input_spec": "The single line of the input contains a non-negative integer n. The representation of number n doesn't contain any leading zeroes and its length doesn't exceed 100 digits. ", "output_spec": "Print \"NO\" (without quotes), if there is no such way to remove some digits from number n.  Otherwise, print \"YES\" in the first line and the resulting number after removing digits from number n in the second line. The printed number must be divisible by 8. If there are multiple possible answers, you may print any of them.", "sample_inputs": ["3454", "10", "111111"], "sample_outputs": ["YES\n344", "YES\n0", "NO"], "notes": null}, "src_uid": "0a2a5927d24c70aca24fc17aa686499e"}
{"nl": {"description": "Nothing has changed since the last round. Dima and Inna still love each other and want to be together. They've made a deal with Seryozha and now they need to make a deal with the dorm guards...There are four guardposts in Dima's dorm. Each post contains two guards (in Russia they are usually elderly women). You can bribe a guard by a chocolate bar or a box of juice. For each guard you know the minimum price of the chocolate bar she can accept as a gift and the minimum price of the box of juice she can accept as a gift. If a chocolate bar for some guard costs less than the minimum chocolate bar price for this guard is, or if a box of juice for some guard costs less than the minimum box of juice price for this guard is, then the guard doesn't accept such a gift.In order to pass through a guardpost, one needs to bribe both guards.The shop has an unlimited amount of juice and chocolate of any price starting with 1. Dima wants to choose some guardpost, buy one gift for each guard from the guardpost and spend exactly n rubles on it.Help him choose a post through which he can safely sneak Inna or otherwise say that this is impossible. Mind you, Inna would be very sorry to hear that!", "input_spec": "The first line of the input contains integer n\u00a0(1\u2009\u2264\u2009n\u2009\u2264\u2009105) \u2014 the money Dima wants to spend. Then follow four lines describing the guardposts. Each line contains four integers a,\u2009b,\u2009c,\u2009d\u00a0(1\u2009\u2264\u2009a,\u2009b,\u2009c,\u2009d\u2009\u2264\u2009105) \u2014 the minimum price of the chocolate and the minimum price of the juice for the first guard and the minimum price of the chocolate and the minimum price of the juice for the second guard, correspondingly.", "output_spec": "In a single line of the output print three space-separated integers: the number of the guardpost, the cost of the first present and the cost of the second present. If there is no guardpost Dima can sneak Inna through at such conditions, print -1 in a single line.  The guardposts are numbered from 1 to 4 according to the order given in the input. If there are multiple solutions, you can print any of them.", "sample_inputs": ["10\n5 6 5 6\n6 6 7 7\n5 8 6 6\n9 9 9 9", "10\n6 6 6 6\n7 7 7 7\n4 4 4 4\n8 8 8 8", "5\n3 3 3 3\n3 3 3 3\n3 3 3 3\n3 3 3 3"], "sample_outputs": ["1 5 5", "3 4 6", "-1"], "notes": "NoteExplanation of the first example.The only way to spend 10 rubles to buy the gifts that won't be less than the minimum prices is to buy two 5 ruble chocolates to both guards from the first guardpost.Explanation of the second example.Dima needs 12 rubles for the first guardpost, 14 for the second one, 16 for the fourth one. So the only guardpost we can sneak through is the third one. So, Dima can buy 4 ruble chocolate for the first guard and 6 ruble juice of the second guard."}, "src_uid": "6e7ee0da980beb99ca49a5ddd04089a5"}
{"nl": {"description": "Comrade Dujikov is busy choosing artists for Timofey's birthday and is recieving calls from Taymyr from Ilia-alpinist.Ilia-alpinist calls every n minutes, i.e. in minutes n, 2n, 3n and so on. Artists come to the comrade every m minutes, i.e. in minutes m, 2m, 3m and so on. The day is z minutes long, i.e. the day consists of minutes 1,\u20092,\u2009...,\u2009z. How many artists should be killed so that there are no artists in the room when Ilia calls? Consider that a call and a talk with an artist take exactly one minute.", "input_spec": "The only string contains three integers\u00a0\u2014 n, m and z (1\u2009\u2264\u2009n,\u2009m,\u2009z\u2009\u2264\u2009104).", "output_spec": "Print single integer\u00a0\u2014 the minimum number of artists that should be killed so that there are no artists in the room when Ilia calls.", "sample_inputs": ["1 1 10", "1 2 5", "2 3 9"], "sample_outputs": ["10", "2", "1"], "notes": "NoteTaymyr is a place in the north of Russia.In the first test the artists come each minute, as well as the calls, so we need to kill all of them.In the second test we need to kill artists which come on the second and the fourth minutes.In the third test\u00a0\u2014 only the artist which comes on the sixth minute. "}, "src_uid": "e7ad55ce26fc8610639323af1de36c2d"}
{"nl": {"description": "In the city of Ultima Thule job applicants are often offered an IQ test. The test is as follows: the person gets a piece of squared paper with a 4\u2009\u00d7\u20094 square painted on it. Some of the square's cells are painted black and others are painted white. Your task is to repaint at most one cell the other color so that the picture has a 2\u2009\u00d7\u20092 square, completely consisting of cells of the same color. If the initial picture already has such a square, the person should just say so and the test will be completed. Your task is to write a program that determines whether it is possible to pass the test. You cannot pass the test if either repainting any cell or no action doesn't result in a 2\u2009\u00d7\u20092 square, consisting of cells of the same color.", "input_spec": "Four lines contain four characters each: the j-th character of the i-th line equals \".\" if the cell in the i-th row and the j-th column of the square is painted white, and \"#\", if the cell is black.", "output_spec": "Print \"YES\" (without the quotes), if the test can be passed and \"NO\" (without the quotes) otherwise.", "sample_inputs": ["####\n.#..\n####\n....", "####\n....\n####\n...."], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first test sample it is enough to repaint the first cell in the second row. After such repainting the required 2\u2009\u00d7\u20092 square is on the intersection of the 1-st and 2-nd row with the 1-st and 2-nd column."}, "src_uid": "01b145e798bbdf0ca2ecc383676d79f3"}
{"nl": {"description": "Dreamoon is standing at the position 0 on a number line. Drazil is sending a list of commands through Wi-Fi to Dreamoon's smartphone and Dreamoon follows them.Each command is one of the following two types:   Go 1 unit towards the positive direction, denoted as '+'  Go 1 unit towards the negative direction, denoted as '-' But the Wi-Fi condition is so poor that Dreamoon's smartphone reports some of the commands can't be recognized and Dreamoon knows that some of them might even be wrong though successfully recognized. Dreamoon decides to follow every recognized command and toss a fair coin to decide those unrecognized ones (that means, he moves to the 1 unit to the negative or positive direction with the same probability 0.5). You are given an original list of commands sent by Drazil and list received by Dreamoon. What is the probability that Dreamoon ends in the position originally supposed to be final by Drazil's commands?", "input_spec": "The first line contains a string s1 \u2014 the commands Drazil sends to Dreamoon, this string consists of only the characters in the set {'+', '-'}.  The second line contains a string s2 \u2014 the commands Dreamoon's smartphone recognizes, this string consists of only the characters in the set {'+', '-', '?'}. '?' denotes an unrecognized command. Lengths of two strings are equal and do not exceed 10.", "output_spec": "Output a single real number corresponding to the probability. The answer will be considered correct if its relative or absolute error doesn't exceed 10\u2009-\u20099.", "sample_inputs": ["++-+-\n+-+-+", "+-+-\n+-??", "+++\n??-"], "sample_outputs": ["1.000000000000", "0.500000000000", "0.000000000000"], "notes": "NoteFor the first sample, both s1 and s2 will lead Dreamoon to finish at the same position \u2009+\u20091. For the second sample, s1 will lead Dreamoon to finish at position 0, while there are four possibilites for s2: {\"+-++\", \"+-+-\", \"+--+\", \"+---\"} with ending position {+2, 0, 0, -2} respectively. So there are 2 correct cases out of 4, so the probability of finishing at the correct position is 0.5. For the third sample, s2 could only lead us to finish at positions {+1, -1, -3}, so the probability to finish at the correct position \u2009+\u20093 is 0."}, "src_uid": "f7f68a15cfd33f641132fac265bc5299"}
{"nl": {"description": "Petya and Vasya decided to play a game. They have n cards (n is an even number). A single integer is written on each card.Before the game Petya will choose an integer and after that Vasya will choose another integer (different from the number that Petya chose). During the game each player takes all the cards with number he chose. For example, if Petya chose number 5 before the game he will take all cards on which 5 is written and if Vasya chose number 10 before the game he will take all cards on which 10 is written.The game is considered fair if Petya and Vasya can take all n cards, and the number of cards each player gets is the same.Determine whether Petya and Vasya can choose integer numbers before the game so that the game is fair. ", "input_spec": "The first line contains a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 number of cards. It is guaranteed that n is an even number. The following n lines contain a sequence of integers a1,\u2009a2,\u2009...,\u2009an (one integer per line, 1\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 numbers written on the n cards.", "output_spec": "If it is impossible for Petya and Vasya to choose numbers in such a way that the game will be fair, print \"NO\" (without quotes) in the first line. In this case you should not print anything more. In the other case print \"YES\" (without quotes) in the first line. In the second line print two distinct integers \u2014 number that Petya should choose and the number that Vasya should choose to make the game fair. If there are several solutions, print any of them.", "sample_inputs": ["4\n11\n27\n27\n11", "2\n6\n6", "6\n10\n20\n30\n20\n10\n20", "6\n1\n1\n2\n2\n3\n3"], "sample_outputs": ["YES\n11 27", "NO", "NO", "NO"], "notes": "NoteIn the first example the game will be fair if, for example, Petya chooses number 11, and Vasya chooses number 27. Then the will take all cards \u2014 Petya will take cards 1 and 4, and Vasya will take cards 2 and 3. Thus, each of them will take exactly two cards.In the second example fair game is impossible because the numbers written on the cards are equal, but the numbers that Petya and Vasya should choose should be distinct.In the third example it is impossible to take all cards. Petya and Vasya can take at most five cards \u2014 for example, Petya can choose number 10 and Vasya can choose number 20. But for the game to be fair it is necessary to take 6 cards."}, "src_uid": "2860b4fb22402ea9574c2f9e403d63d8"}
{"nl": {"description": "Given a positive integer $$$m$$$, we say that a sequence $$$x_1, x_2, \\dots, x_n$$$ of positive integers is $$$m$$$-cute if for every index $$$i$$$ such that $$$2 \\le i \\le n$$$ it holds that $$$x_i = x_{i - 1} + x_{i - 2} + \\dots + x_1 + r_i$$$ for some positive integer $$$r_i$$$ satisfying $$$1 \\le r_i \\le m$$$.You will be given $$$q$$$ queries consisting of three positive integers $$$a$$$, $$$b$$$ and $$$m$$$. For each query you must determine whether or not there exists an $$$m$$$-cute sequence whose first term is $$$a$$$ and whose last term is $$$b$$$. If such a sequence exists, you must additionally find an example of it.", "input_spec": "The first line contains an integer number $$$q$$$ ($$$1 \\le q \\le 10^3$$$)\u00a0\u2014 the number of queries. Each of the following $$$q$$$ lines contains three integers $$$a$$$, $$$b$$$, and $$$m$$$ ($$$1 \\le a, b, m \\le 10^{14}$$$, $$$a \\leq b$$$), describing a single query.", "output_spec": "For each query, if no $$$m$$$-cute sequence whose first term is $$$a$$$ and whose last term is $$$b$$$ exists, print $$$-1$$$. Otherwise print an integer $$$k$$$ ($$$1 \\le k \\leq 50$$$), followed by $$$k$$$ integers $$$x_1, x_2, \\dots, x_k$$$ ($$$1 \\le x_i \\le 10^{14}$$$). These integers must satisfy $$$x_1 = a$$$, $$$x_k = b$$$, and that the sequence $$$x_1, x_2, \\dots, x_k$$$ is $$$m$$$-cute. It can be shown that under the problem constraints, for each query either no $$$m$$$-cute sequence exists, or there exists one with at most $$$50$$$ terms. If there are multiple possible sequences, you may print any of them.", "sample_inputs": ["2\n5 26 2\n3 9 1"], "sample_outputs": ["4 5 6 13 26\n-1"], "notes": "NoteConsider the sample. In the first query, the sequence $$$5, 6, 13, 26$$$ is valid since $$$6 = 5 + \\bf{\\color{blue} 1}$$$, $$$13 = 6 + 5 + {\\bf\\color{blue} 2}$$$ and $$$26 = 13 + 6 + 5 + {\\bf\\color{blue} 2}$$$ have the bold values all between $$$1$$$ and $$$2$$$, so the sequence is $$$2$$$-cute. Other valid sequences, such as $$$5, 7, 13, 26$$$ are also accepted.In the second query, the only possible $$$1$$$-cute sequence starting at $$$3$$$ is $$$3, 4, 8, 16, \\dots$$$, which does not contain $$$9$$$."}, "src_uid": "c9d646762e2e78064bc0670ec7c173c6"}
{"nl": {"description": "Polycarpus has a ribbon, its length is n. He wants to cut the ribbon in a way that fulfils the following two conditions:   After the cutting each ribbon piece should have length a, b or c.  After the cutting the number of ribbon pieces should be maximum. Help Polycarpus and find the number of ribbon pieces after the required cutting.", "input_spec": "The first line contains four space-separated integers n, a, b and c (1\u2009\u2264\u2009n,\u2009a,\u2009b,\u2009c\u2009\u2264\u20094000) \u2014 the length of the original ribbon and the acceptable lengths of the ribbon pieces after the cutting, correspondingly. The numbers a, b and c can coincide.", "output_spec": "Print a single number \u2014 the maximum possible number of ribbon pieces. It is guaranteed that at least one correct ribbon cutting exists.", "sample_inputs": ["5 5 3 2", "7 5 5 2"], "sample_outputs": ["2", "2"], "notes": "NoteIn the first example Polycarpus can cut the ribbon in such way: the first piece has length 2, the second piece has length 3.In the second example Polycarpus can cut the ribbon in such way: the first piece has length 5, the second piece has length 2."}, "src_uid": "062a171cc3ea717ea95ede9d7a1c3a43"}
{"nl": {"description": "Polycarpus has got n candies and m friends (n\u2009\u2265\u2009m). He wants to make a New Year present with candies to each friend. Polycarpus is planning to present all candies and he wants to do this in the fairest (that is, most equal) manner. He wants to choose such ai, where ai is the number of candies in the i-th friend's present, that the maximum ai differs from the least ai as little as possible.For example, if n is divisible by m, then he is going to present the same number of candies to all his friends, that is, the maximum ai won't differ from the minimum one.", "input_spec": "The single line of the input contains a pair of space-separated positive integers n, m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100;n\u2009\u2265\u2009m) \u2014 the number of candies and the number of Polycarpus's friends.", "output_spec": "Print the required sequence a1,\u2009a2,\u2009...,\u2009am, where ai is the number of candies in the i-th friend's present. All numbers ai must be positive integers, total up to n, the maximum one should differ from the minimum one by the smallest possible value.", "sample_inputs": ["12 3", "15 4", "18 7"], "sample_outputs": ["4 4 4", "3 4 4 4", "2 2 2 3 3 3 3"], "notes": "NotePrint ai in any order, separate the numbers by spaces."}, "src_uid": "0b2c1650979a9931e00ffe32a70e3c23"}
{"nl": {"description": "Vasily the bear has a favorite rectangle, it has one vertex at point (0,\u20090), and the opposite vertex at point (x,\u2009y). Of course, the sides of Vasya's favorite rectangle are parallel to the coordinate axes. Vasya also loves triangles, if the triangles have one vertex at point B\u2009=\u2009(0,\u20090). That's why today he asks you to find two points A\u2009=\u2009(x1,\u2009y1) and C\u2009=\u2009(x2,\u2009y2), such that the following conditions hold:  the coordinates of points: x1, x2, y1, y2 are integers. Besides, the following inequation holds: x1\u2009<\u2009x2;  the triangle formed by point A, B and C is rectangular and isosceles ( is right);  all points of the favorite rectangle are located inside or on the border of triangle ABC;  the area of triangle ABC is as small as possible. Help the bear, find the required points. It is not so hard to proof that these points are unique.", "input_spec": "The first line contains two integers x,\u2009y (\u2009-\u2009109\u2009\u2264\u2009x,\u2009y\u2009\u2264\u2009109,\u2009x\u2009\u2260\u20090,\u2009y\u2009\u2260\u20090).", "output_spec": "Print in the single line four integers x1,\u2009y1,\u2009x2,\u2009y2 \u2014 the coordinates of the required points.", "sample_inputs": ["10 5", "-10 5"], "sample_outputs": ["0 15 15 0", "-15 0 0 15"], "notes": "NoteFigure to the first sample"}, "src_uid": "e2f15a9d9593eec2e19be3140a847712"}
{"nl": {"description": "You have unlimited number of coins with values $$$1, 2, \\ldots, n$$$. You want to select some set of coins having the total value of $$$S$$$. It is allowed to have multiple coins with the same value in the set. What is the minimum number of coins required to get sum $$$S$$$?", "input_spec": "The only line of the input contains two integers $$$n$$$ and $$$S$$$ ($$$1 \\le n \\le 100\\,000$$$, $$$1 \\le S \\le 10^9$$$)", "output_spec": "Print exactly one integer\u00a0\u2014 the minimum number of coins required to obtain sum $$$S$$$.", "sample_inputs": ["5 11", "6 16"], "sample_outputs": ["3", "3"], "notes": "NoteIn the first example, some of the possible ways to get sum $$$11$$$ with $$$3$$$ coins are:   $$$(3, 4, 4)$$$ $$$(2, 4, 5)$$$ $$$(1, 5, 5)$$$ $$$(3, 3, 5)$$$ It is impossible to get sum $$$11$$$ with less than $$$3$$$ coins.In the second example, some of the possible ways to get sum $$$16$$$ with $$$3$$$ coins are:   $$$(5, 5, 6)$$$ $$$(4, 6, 6)$$$ It is impossible to get sum $$$16$$$ with less than $$$3$$$ coins."}, "src_uid": "04c067326ec897091c3dbcf4d134df96"}
{"nl": {"description": "Alex, Bob and Carl will soon participate in a team chess tournament. Since they are all in the same team, they have decided to practise really hard before the tournament. But it's a bit difficult for them because chess is a game for two players, not three.So they play with each other according to following rules:  Alex and Bob play the first game, and Carl is spectating;  When the game ends, the one who lost the game becomes the spectator in the next game, and the one who was spectating plays against the winner. Alex, Bob and Carl play in such a way that there are no draws.Today they have played n games, and for each of these games they remember who was the winner. They decided to make up a log of games describing who won each game. But now they doubt if the information in the log is correct, and they want to know if the situation described in the log they made up was possible (that is, no game is won by someone who is spectating if Alex, Bob and Carl play according to the rules). Help them to check it!", "input_spec": "The first line contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of games Alex, Bob and Carl played. Then n lines follow, describing the game log. i-th line contains one integer ai (1\u2009\u2264\u2009ai\u2009\u2264\u20093) which is equal to 1 if Alex won i-th game, to 2 if Bob won i-th game and 3 if Carl won i-th game.", "output_spec": "Print YES if the situation described in the log was possible. Otherwise print NO.", "sample_inputs": ["3\n1\n1\n2", "2\n1\n2"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example the possible situation is:  Alex wins, Carl starts playing instead of Bob;  Alex wins, Bob replaces Carl;  Bob wins. The situation in the second example is impossible because Bob loses the first game, so he cannot win the second one."}, "src_uid": "6c7ab07abdf157c24be92f49fd1d8d87"}
{"nl": {"description": "Dawid has four bags of candies. The $$$i$$$-th of them contains $$$a_i$$$ candies. Also, Dawid has two friends. He wants to give each bag to one of his two friends. Is it possible to distribute the bags in such a way that each friend receives the same amount of candies in total?Note, that you can't keep bags for yourself or throw them away, each bag should be given to one of the friends.", "input_spec": "The only line contains four integers $$$a_1$$$, $$$a_2$$$, $$$a_3$$$ and $$$a_4$$$ ($$$1 \\leq a_i \\leq 100$$$) \u2014 the numbers of candies in each bag.", "output_spec": "Output YES if it's possible to give the bags to Dawid's friends so that both friends receive the same amount of candies, or NO otherwise. Each character can be printed in any case (either uppercase or lowercase).", "sample_inputs": ["1 7 11 5", "7 3 2 5"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first sample test, Dawid can give the first and the third bag to the first friend, and the second and the fourth bag to the second friend. This way, each friend will receive $$$12$$$ candies.In the second sample test, it's impossible to distribute the bags."}, "src_uid": "5a623c49cf7effacfb58bc82f8eaff37"}
{"nl": {"description": "Dima loves representing an odd number as the sum of multiple primes, and Lisa loves it when there are at most three primes. Help them to represent the given number as the sum of at most than three primes.More formally, you are given an odd numer n. Find a set of numbers pi (1\u2009\u2264\u2009i\u2009\u2264\u2009k), such that 1\u2009\u2264\u2009k\u2009\u2264\u20093 pi is a prime The numbers pi do not necessarily have to be distinct. It is guaranteed that at least one possible solution exists.", "input_spec": "The single line contains an odd number n (3\u2009\u2264\u2009n\u2009<\u2009109).", "output_spec": "In the first line print k (1\u2009\u2264\u2009k\u2009\u2264\u20093), showing how many numbers are in the representation you found. In the second line print numbers pi in any order. If there are multiple possible solutions, you can print any of them.", "sample_inputs": ["27"], "sample_outputs": ["3\n5 11 11"], "notes": "NoteA prime is an integer strictly larger than one that is divisible only by one and by itself."}, "src_uid": "f2aaa149ce81bf332d0b5d80b2a13bc3"}
{"nl": {"description": "We consider a positive integer perfect, if and only if the sum of its digits is exactly $$$10$$$. Given a positive integer $$$k$$$, your task is to find the $$$k$$$-th smallest perfect positive integer.", "input_spec": "A single line with a positive integer $$$k$$$ ($$$1 \\leq k \\leq 10\\,000$$$).", "output_spec": "A single number, denoting the $$$k$$$-th smallest perfect integer.", "sample_inputs": ["1", "2"], "sample_outputs": ["19", "28"], "notes": "NoteThe first perfect integer is $$$19$$$ and the second one is $$$28$$$."}, "src_uid": "0a98a6a15e553ce11cb468d3330fc86a"}
{"nl": {"description": "This morning, Roman woke up and opened the browser with $$$n$$$ opened tabs numbered from $$$1$$$ to $$$n$$$. There are two kinds of tabs: those with the information required for the test and those with social network sites. Roman decided that there are too many tabs open so he wants to close some of them.He decided to accomplish this by closing every $$$k$$$-th ($$$2 \\leq k \\leq n - 1$$$) tab. Only then he will decide whether he wants to study for the test or to chat on the social networks. Formally, Roman will choose one tab (let its number be $$$b$$$) and then close all tabs with numbers $$$c = b + i \\cdot k$$$ that satisfy the following condition: $$$1 \\leq c \\leq n$$$ and $$$i$$$ is an integer (it may be positive, negative or zero).For example, if $$$k = 3$$$, $$$n = 14$$$ and Roman chooses $$$b = 8$$$, then he will close tabs with numbers $$$2$$$, $$$5$$$, $$$8$$$, $$$11$$$ and $$$14$$$.After closing the tabs Roman will calculate the amount of remaining tabs with the information for the test (let's denote it $$$e$$$) and the amount of remaining social network tabs ($$$s$$$). Help Roman to calculate the maximal absolute value of the difference of those values $$$|e - s|$$$ so that it would be easy to decide what to do next.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$2 \\leq k < n \\leq 100$$$) \u2014 the amount of tabs opened currently and the distance between the tabs closed. The second line consists of $$$n$$$ integers, each of them equal either to $$$1$$$ or to $$$-1$$$. The $$$i$$$-th integer denotes the type of the $$$i$$$-th tab: if it is equal to $$$1$$$, this tab contains information for the test, and if it is equal to $$$-1$$$, it's a social network tab.", "output_spec": "Output a single integer \u2014 the maximum absolute difference between the amounts of remaining tabs of different types $$$|e - s|$$$.", "sample_inputs": ["4 2\n1 1 -1 1", "14 3\n-1 1 -1 -1 1 -1 -1 1 -1 -1 1 -1 -1 1"], "sample_outputs": ["2", "9"], "notes": "NoteIn the first example we can choose $$$b = 1$$$ or $$$b = 3$$$. We will delete then one tab of each type and the remaining tabs are then all contain test information. Thus, $$$e = 2$$$ and $$$s = 0$$$ and $$$|e - s| = 2$$$.In the second example, on the contrary, we can leave opened only tabs that have social networks opened in them."}, "src_uid": "6119258322e06fa6146e592c63313df3"}
{"nl": {"description": "Vasiliy has a car and he wants to get from home to the post office. The distance which he needs to pass equals to d kilometers.Vasiliy's car is not new \u2014 it breaks after driven every k kilometers and Vasiliy needs t seconds to repair it. After repairing his car Vasiliy can drive again (but after k kilometers it will break again, and so on). In the beginning of the trip the car is just from repair station.To drive one kilometer on car Vasiliy spends a seconds, to walk one kilometer on foot he needs b seconds (a\u2009<\u2009b).Your task is to find minimal time after which Vasiliy will be able to reach the post office. Consider that in every moment of time Vasiliy can left his car and start to go on foot.", "input_spec": "The first line contains 5 positive integers d,\u2009k,\u2009a,\u2009b,\u2009t (1\u2009\u2264\u2009d\u2009\u2264\u20091012; 1\u2009\u2264\u2009k,\u2009a,\u2009b,\u2009t\u2009\u2264\u2009106; a\u2009<\u2009b), where:   d \u2014 the distance from home to the post office;  k \u2014 the distance, which car is able to drive before breaking;  a \u2014 the time, which Vasiliy spends to drive 1 kilometer on his car;  b \u2014 the time, which Vasiliy spends to walk 1 kilometer on foot;  t \u2014 the time, which Vasiliy spends to repair his car. ", "output_spec": "Print the minimal time after which Vasiliy will be able to reach the post office.", "sample_inputs": ["5 2 1 4 10", "5 2 1 4 5"], "sample_outputs": ["14", "13"], "notes": "NoteIn the first example Vasiliy needs to drive the first 2 kilometers on the car (in 2 seconds) and then to walk on foot 3 kilometers (in 12 seconds). So the answer equals to 14 seconds.In the second example Vasiliy needs to drive the first 2 kilometers on the car (in 2 seconds), then repair his car (in 5 seconds) and drive 2 kilometers more on the car (in 2 seconds). After that he needs to walk on foot 1 kilometer (in 4 seconds). So the answer equals to 13 seconds."}, "src_uid": "359ddf1f1aed9b3256836e5856fe3466"}
{"nl": {"description": "A positive integer is called a 2-3-integer, if it is equal to 2x\u00b73y for some non-negative integers x and y. In other words, these integers are such integers that only have 2 and 3 among their prime divisors. For example, integers 1, 6, 9, 16 and 108 \u2014 are 2-3 integers, while 5, 10, 21 and 120 are not.Print the number of 2-3-integers on the given segment [l,\u2009r], i.\u00a0e. the number of sich 2-3-integers t that l\u2009\u2264\u2009t\u2009\u2264\u2009r.", "input_spec": "The only line contains two integers l and r (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u20092\u00b7109).", "output_spec": "Print a single integer the number of 2-3-integers on the segment [l,\u2009r].", "sample_inputs": ["1 10", "100 200", "1 2000000000"], "sample_outputs": ["7", "5", "326"], "notes": "NoteIn the first example the 2-3-integers are 1, 2, 3, 4, 6, 8 and 9.In the second example the 2-3-integers are 108, 128, 144, 162 and 192."}, "src_uid": "05fac54ed2064b46338bb18f897a4411"}
{"nl": {"description": "This is a harder version of the problem. In this version, $$$n \\le 300\\,000$$$.Vasya is an experienced developer of programming competitions' problems. As all great minds at some time, Vasya faced a creative crisis. To improve the situation, Petya gifted him a string consisting of opening and closing brackets only. Petya believes, that the beauty of the bracket string is a number of its cyclical shifts, which form a correct bracket sequence.To digress from his problems, Vasya decided to select two positions of the string (not necessarily distinct) and swap characters located at this positions with each other. Vasya will apply this operation exactly once. He is curious what is the maximum possible beauty he can achieve this way. Please help him.We remind that bracket sequence $$$s$$$ is called correct if:   $$$s$$$ is empty;  $$$s$$$ is equal to \"($$$t$$$)\", where $$$t$$$ is correct bracket sequence;  $$$s$$$ is equal to $$$t_1 t_2$$$, i.e. concatenation of $$$t_1$$$ and $$$t_2$$$, where $$$t_1$$$ and $$$t_2$$$ are correct bracket sequences. For example, \"(()())\", \"()\" are correct, while \")(\" and \"())\" are not.The cyclical shift of the string $$$s$$$ of length $$$n$$$ by $$$k$$$ ($$$0 \\leq k < n$$$) is a string formed by a concatenation of the last $$$k$$$ symbols of the string $$$s$$$ with the first $$$n - k$$$ symbols of string $$$s$$$. For example, the cyclical shift of string \"(())()\" by $$$2$$$ equals \"()(())\".Cyclical shifts $$$i$$$ and $$$j$$$ are considered different, if $$$i \\ne j$$$.", "input_spec": "The first line contains an integer $$$n$$$ ($$$1 \\le n \\le 300\\,000$$$), the length of the string. The second line contains a string, consisting of exactly $$$n$$$ characters, where each of the characters is either \"(\" or \")\".", "output_spec": "The first line should contain a single integer\u00a0\u2014 the largest beauty of the string, which can be achieved by swapping some two characters. The second line should contain integers $$$l$$$ and $$$r$$$ ($$$1 \\leq l, r \\leq n$$$)\u00a0\u2014 the indices of two characters, which should be swapped in order to maximize the string's beauty. In case there are several possible swaps, print any of them.", "sample_inputs": ["10\n()()())(()", "12\n)(()(()())()", "6\n)))(()"], "sample_outputs": ["5\n8 7", "4\n5 10", "0\n1 1"], "notes": "NoteIn the first example, we can swap $$$7$$$-th and $$$8$$$-th character, obtaining a string \"()()()()()\". The cyclical shifts by $$$0, 2, 4, 6, 8$$$ of this string form a correct bracket sequence.In the second example, after swapping $$$5$$$-th and $$$10$$$-th character, we obtain a string \")(())()()(()\". The cyclical shifts by $$$11, 7, 5, 3$$$ of this string form a correct bracket sequence.In the third example, swap of any two brackets results in $$$0$$$ cyclical shifts being correct bracket sequences. "}, "src_uid": "be820239276b5e1a346309f9dd21c5cb"}
{"nl": {"description": "Trouble came from the overseas lands: a three-headed dragon Gorynych arrived. The dragon settled at point C and began to terrorize the residents of the surrounding villages.A brave hero decided to put an end to the dragon. He moved from point A to fight with Gorynych. The hero rode from point A along a straight road and met point B on his way. The hero knows that in this land for every pair of roads it is true that they are either parallel to each other, or lie on a straight line, or are perpendicular to each other. He also knows well that points B and C are connected by a road. So the hero must either turn 90 degrees to the left or continue riding straight ahead or turn 90 degrees to the right. But he forgot where the point C is located.Fortunately, a Brave Falcon flew right by. It can see all three points from the sky. The hero asked him what way to go to get to the dragon's lair.If you have not got it, you are the falcon. Help the hero and tell him how to get him to point C: turn left, go straight or turn right.At this moment the hero is believed to stand at point B, turning his back to point A.", "input_spec": "The first input line contains two space-separated integers xa,\u2009ya (|xa|,\u2009|ya|\u2009\u2264\u2009109) \u2014 the coordinates of point A. The second line contains the coordinates of point B in the same form, the third line contains the coordinates of point C. It is guaranteed that all points are pairwise different. It is also guaranteed that either point B lies on segment AC, or angle ABC is right.", "output_spec": "Print a single line. If a hero must turn left, print \"LEFT\" (without the quotes); If he must go straight ahead, print \"TOWARDS\" (without the quotes); if he should turn right, print \"RIGHT\" (without the quotes).", "sample_inputs": ["0 0\n0 1\n1 1", "-1 -1\n-3 -3\n-4 -4", "-4 -6\n-3 -7\n-2 -6"], "sample_outputs": ["RIGHT", "TOWARDS", "LEFT"], "notes": "NoteThe picture to the first sample: The red color shows points A, B and C. The blue arrow shows the hero's direction. The green color shows the hero's trajectory.The picture to the second sample: "}, "src_uid": "f6e132d1969863e9f28c87e5a44c2b69"}
{"nl": {"description": "Professor GukiZ makes a new robot. The robot are in the point with coordinates (x1,\u2009y1) and should go to the point (x2,\u2009y2). In a single step the robot can change any of its coordinates (maybe both of them) by one (decrease or increase). So the robot can move in one of the 8 directions. Find the minimal number of steps the robot should make to get the finish position.", "input_spec": "The first line contains two integers x1,\u2009y1 (\u2009-\u2009109\u2009\u2264\u2009x1,\u2009y1\u2009\u2264\u2009109) \u2014 the start position of the robot. The second line contains two integers x2,\u2009y2 (\u2009-\u2009109\u2009\u2264\u2009x2,\u2009y2\u2009\u2264\u2009109) \u2014 the finish position of the robot.", "output_spec": "Print the only integer d \u2014 the minimal number of steps to get the finish position.", "sample_inputs": ["0 0\n4 5", "3 4\n6 1"], "sample_outputs": ["5", "3"], "notes": "NoteIn the first example robot should increase both of its coordinates by one four times, so it will be in position (4,\u20094). After that robot should simply increase its y coordinate and get the finish position.In the second example robot should simultaneously increase x coordinate and decrease y coordinate by one three times."}, "src_uid": "a6e9405bc3d4847fe962446bc1c457b4"}
{"nl": {"description": "When Igor K. was a freshman, his professor strictly urged him, as well as all other freshmen, to solve programming Olympiads. One day a problem called \"Flags\" from a website called Timmy's Online Judge caught his attention. In the problem one had to find the number of three-colored flags that would satisfy the condition... actually, it doesn't matter. Igor K. quickly found the formula and got the so passionately desired Accepted.However, the professor wasn't very much impressed. He decided that the problem represented on Timmy's Online Judge was very dull and simple: it only had three possible colors of flag stripes and only two limitations. He suggested a complicated task to Igor K. and the fellow failed to solve it. Of course, we won't tell anybody that the professor couldn't solve it as well.And how about you? Can you solve the problem?The flags consist of one or several parallel stripes of similar width. The stripes can be one of the following colors: white, black, red or yellow. You should find the number of different flags with the number of stripes from L to R, if:  a flag cannot have adjacent stripes of one color;  a flag cannot have adjacent white and yellow stripes;  a flag cannot have adjacent red and black stripes;  a flag cannot have the combination of black, white and red stripes following one after another in this or reverse order;  symmetrical flags (as, for example, a WB and a BW flag, where W and B stand for the white and black colors) are considered the same. ", "input_spec": "The only line contains two integers L and R (1\u2009\u2264\u2009L\u2009\u2264\u2009R\u2009\u2264\u2009109). They are the lower and upper borders of the number of stripes on the flag.", "output_spec": "Print a single number \u2014 the number of different flags that would satisfy the condition of the problem and would have from L to R stripes, modulo 1000000007.", "sample_inputs": ["3 4", "5 6"], "sample_outputs": ["23", "64"], "notes": "NoteIn the first test the following flags exist (they are listed in the lexicographical order, the letters B, R, W, Y stand for Black, Red, White and Yellow correspondingly):3 stripes: BWB, BYB, BYR, RWR, RYR, WBW, WBY, WRW, WRY, YBY, YRY (overall 11 flags).4 stripes: BWBW, BWBY, BYBW, BYBY, BYRW, BYRY, RWRW, RWRY, RYBW, RYBY, RYRW, RYRY (12 flags).That's why the answer to test 1 is equal to 11\u2009+\u200912\u2009=\u200923."}, "src_uid": "e04b6957d9c1659e9d2460410cb57f10"}
{"nl": {"description": "Several months later Alex finally got his brother Bob's creation by post. And now, in his turn, Alex wants to boast about something to his brother. He thought for a while, and came to the conclusion that he has no ready creations, and decided to write a program for rectangles detection. According to his plan, the program detects if the four given segments form a rectangle of a positive area and with sides parallel to coordinate axes. As Alex does badly at school and can't write this program by himself, he asks you to help him.", "input_spec": "The input data contain four lines. Each of these lines contains four integers x1, y1, x2, y2 (\u2009-\u2009109\u2009\u2264\u2009x1,\u2009y1,\u2009x2,\u2009y2\u2009\u2264\u2009109) \u2014 coordinates of segment's beginning and end positions. The given segments can degenerate into points.", "output_spec": "Output the word \u00abYES\u00bb, if the given four segments form the required rectangle, otherwise output \u00abNO\u00bb.", "sample_inputs": ["1 1 6 1\n1 0 6 0\n6 0 6 1\n1 1 1 0", "0 0 0 3\n2 0 0 0\n2 2 2 0\n0 2 2 2"], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "ad105c08f63e9761fe90f69630628027"}
{"nl": {"description": "Fibonacci strings are defined as follows:   f1 = \u00aba\u00bb  f2 = \u00abb\u00bb  fn = fn\u2009-\u20091\u00a0fn\u2009-\u20092, n\u2009>\u20092 Thus, the first five Fibonacci strings are: \"a\", \"b\", \"ba\", \"bab\", \"babba\".You are given a Fibonacci string and m strings si. For each string si, find the number of times it occurs in the given Fibonacci string as a substring.", "input_spec": "The first line contains two space-separated integers k and m \u2014 the number of a Fibonacci string and the number of queries, correspondingly. Next m lines contain strings si that correspond to the queries. It is guaranteed that strings si aren't empty and consist only of characters \"a\" and \"b\". The input limitations for getting 30 points are:    1\u2009\u2264\u2009k\u2009\u2264\u20093000  1\u2009\u2264\u2009m\u2009\u2264\u20093000  The total length of strings si doesn't exceed 3000  The input limitations for getting 100 points are:    1\u2009\u2264\u2009k\u2009\u2264\u20091018  1\u2009\u2264\u2009m\u2009\u2264\u2009104  The total length of strings si doesn't exceed 105  Please do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specifier.", "output_spec": "For each string si print the number of times it occurs in the given Fibonacci string as a substring. Since the numbers can be large enough, print them modulo 1000000007 (109\u2009+\u20097). Print the answers for the strings in the order in which they are given in the input.", "sample_inputs": ["6 5\na\nb\nab\nba\naba"], "sample_outputs": ["3\n5\n3\n3\n1"], "notes": null}, "src_uid": "8983915e904ba763d893d56e94d9f7f0"}
{"nl": {"description": "Tattah's youngest brother, Tuftuf, is new to programming.Since his older brother is such a good programmer, his biggest dream is to outshine him. Tuftuf is a student at the German University in Cairo (GUC) where he learns to write programs in Gava.Today, Tuftuf was introduced to Gava's unsigned integer datatypes. Gava has n unsigned integer datatypes of sizes (in bits) a1,\u2009a2,\u2009... an. The i-th datatype have size ai bits, so it can represent every integer between 0 and 2ai\u2009-\u20091 inclusive. Tuftuf is thinking of learning a better programming language. If there exists an integer x, such that x fits in some type i (in ai bits) and x\u00b7x does not fit in some other type j (in aj bits) where ai\u2009<\u2009aj, then Tuftuf will stop using Gava.Your task is to determine Tuftuf's destiny.", "input_spec": "The first line contains integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009105) \u2014 the number of Gava's unsigned integer datatypes' sizes. The second line contains a single-space-separated list of n integers (1\u2009\u2264\u2009ai\u2009\u2264\u2009109) \u2014 sizes of datatypes in bits. Some datatypes may have equal sizes.", "output_spec": "Print \"YES\" if Tuftuf will stop using Gava, and \"NO\" otherwise.", "sample_inputs": ["3\n64 16 32", "4\n4 2 1 3"], "sample_outputs": ["NO", "YES"], "notes": "NoteIn the second example, x\u2009=\u20097 (1112) fits in 3 bits, but x2\u2009=\u200949 (1100012) does not fit in 4 bits."}, "src_uid": "ab003ab094931fc105384df9d144131e"}
{"nl": {"description": "A tennis tournament with n participants is running. The participants are playing by an olympic system, so the winners move on and the losers drop out.The tournament takes place in the following way (below, m is the number of the participants of the current round):  let k be the maximal power of the number 2 such that k\u2009\u2264\u2009m,  k participants compete in the current round and a half of them passes to the next round, the other m\u2009-\u2009k participants pass to the next round directly,  when only one participant remains, the tournament finishes. Each match requires b bottles of water for each participant and one bottle for the judge. Besides p towels are given to each participant for the whole tournament.Find the number of bottles and towels needed for the tournament.Note that it's a tennis tournament so in each match two participants compete (one of them will win and the other will lose).", "input_spec": "The only line contains three integers n,\u2009b,\u2009p (1\u2009\u2264\u2009n,\u2009b,\u2009p\u2009\u2264\u2009500) \u2014 the number of participants and the parameters described in the problem statement.", "output_spec": "Print two integers x and y \u2014 the number of bottles and towels need for the tournament.", "sample_inputs": ["5 2 3", "8 2 4"], "sample_outputs": ["20 15", "35 32"], "notes": "NoteIn the first example will be three rounds:  in the first round will be two matches and for each match 5 bottles of water are needed (two for each of the participants and one for the judge),  in the second round will be only one match, so we need another 5 bottles of water,  in the third round will also be only one match, so we need another 5 bottles of water. So in total we need 20 bottles of water.In the second example no participant will move on to some round directly."}, "src_uid": "eb815f35e9f29793a120d120968cfe34"}
{"nl": {"description": "Once Max found an electronic calculator from his grandfather Dovlet's chest. He noticed that the numbers were written with seven-segment indicators (https://en.wikipedia.org/wiki/Seven-segment_display).  Max starts to type all the values from a to b. After typing each number Max resets the calculator. Find the total number of segments printed on the calculator.For example if a\u2009=\u20091 and b\u2009=\u20093 then at first the calculator will print 2 segments, then \u2014 5 segments and at last it will print 5 segments. So the total number of printed segments is 12.", "input_spec": "The only line contains two integers a,\u2009b (1\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u2009106) \u2014 the first and the last number typed by Max.", "output_spec": "Print the only integer a \u2014 the total number of printed segments.", "sample_inputs": ["1 3", "10 15"], "sample_outputs": ["12", "39"], "notes": null}, "src_uid": "1193de6f80a9feee8522a404d16425b9"}
{"nl": {"description": "Sereja showed an interesting game to his friends. The game goes like that. Initially, there is a table with an empty cup and n water mugs on it. Then all players take turns to move. During a move, a player takes a non-empty mug of water and pours all water from it into the cup. If the cup overfills, then we assume that this player lost.As soon as Sereja's friends heard of the game, they wanted to play it. Sereja, on the other hand, wanted to find out whether his friends can play the game in such a way that there are no losers. You are given the volumes of all mugs and the cup. Also, you know that Sereja has (n\u2009-\u20091) friends. Determine if Sereja's friends can play the game so that nobody loses.", "input_spec": "The first line contains integers n and s (2\u2009\u2264\u2009n\u2009\u2264\u2009100;\u00a01\u2009\u2264\u2009s\u2009\u2264\u20091000) \u2014 the number of mugs and the volume of the cup. The next line contains n integers a1, a2, ..., an (1\u2009\u2264\u2009ai\u2009\u2264\u200910). Number ai means the volume of the i-th mug.", "output_spec": "In a single line, print \"YES\" (without the quotes) if his friends can play in the described manner, and \"NO\" (without the quotes) otherwise.", "sample_inputs": ["3 4\n1 1 1", "3 4\n3 1 3", "3 4\n4 4 4"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "496baae594b32c5ffda35b896ebde629"}
{"nl": {"description": "Your program fails again. This time it gets \"Wrong answer on test 233\".This is the harder version of the problem. In this version, $$$1 \\le n \\le 2\\cdot10^5$$$. You can hack this problem if you locked it. But you can hack the previous problem only if you locked both problems.The problem is to finish $$$n$$$ one-choice-questions. Each of the questions contains $$$k$$$ options, and only one of them is correct. The answer to the $$$i$$$-th question is $$$h_{i}$$$, and if your answer of the question $$$i$$$ is $$$h_{i}$$$, you earn $$$1$$$ point, otherwise, you earn $$$0$$$ points for this question. The values $$$h_1, h_2, \\dots, h_n$$$ are known to you in this problem.However, you have a mistake in your program. It moves the answer clockwise! Consider all the $$$n$$$ answers are written in a circle. Due to the mistake in your program, they are shifted by one cyclically.Formally, the mistake moves the answer for the question $$$i$$$ to the question $$$i \\bmod n + 1$$$. So it moves the answer for the question $$$1$$$ to question $$$2$$$, the answer for the question $$$2$$$ to the question $$$3$$$, ..., the answer for the question $$$n$$$ to the question $$$1$$$.We call all the $$$n$$$ answers together an answer suit. There are $$$k^n$$$ possible answer suits in total.You're wondering, how many answer suits satisfy the following condition: after moving clockwise by $$$1$$$, the total number of points of the new answer suit is strictly larger than the number of points of the old one. You need to find the answer modulo $$$998\\,244\\,353$$$.For example, if $$$n = 5$$$, and your answer suit is $$$a=[1,2,3,4,5]$$$, it will submitted as $$$a'=[5,1,2,3,4]$$$ because of a mistake. If the correct answer suit is $$$h=[5,2,2,3,4]$$$, the answer suit $$$a$$$ earns $$$1$$$ point and the answer suite $$$a'$$$ earns $$$4$$$ points. Since $$$4 > 1$$$, the answer suit $$$a=[1,2,3,4,5]$$$ should be counted.", "input_spec": "The first line contains two integers $$$n$$$, $$$k$$$ ($$$1 \\le n \\le 2\\cdot10^5$$$, $$$1 \\le k \\le 10^9$$$)\u00a0\u2014 the number of questions and the number of possible answers to each question. The following line contains $$$n$$$ integers $$$h_1, h_2, \\dots, h_n$$$, ($$$1 \\le h_{i} \\le k)$$$\u00a0\u2014 answers to the questions.", "output_spec": "Output one integer: the number of answers suits satisfying the given condition, modulo $$$998\\,244\\,353$$$.", "sample_inputs": ["3 3\n1 3 1", "5 5\n1 1 4 2 2", "6 2\n1 1 2 2 1 1"], "sample_outputs": ["9", "1000", "16"], "notes": "NoteFor the first example, valid answer suits are $$$[2,1,1], [2,1,2], [2,1,3], [3,1,1], [3,1,2], [3,1,3], [3,2,1], [3,2,2], [3,2,3]$$$."}, "src_uid": "63c4006a0a6284f9825aaabfc4c28fd1"}
{"nl": {"description": "Kicker (table football) is a board game based on football, in which players control the footballers' figures mounted on rods by using bars to get the ball into the opponent's goal. When playing two on two, one player of each team controls the goalkeeper and the full-backs (plays defence), the other player controls the half-backs and forwards (plays attack).Two teams of company Q decided to battle each other. Let's enumerate players from both teams by integers from 1 to 4. The first and second player play in the first team, the third and the fourth one play in the second team. For each of the four players we know their game skills in defence and attack. The defence skill of the i-th player is ai, the attack skill is bi.Before the game, the teams determine how they will play. First the players of the first team decide who will play in the attack, and who will play in the defence. Then the second team players do the same, based on the choice of their opponents.We will define a team's defence as the defence skill of player of the team who plays defence. Similarly, a team's attack is the attack skill of the player of the team who plays attack. We assume that one team is guaranteed to beat the other one, if its defence is strictly greater than the opponent's attack and its attack is strictly greater than the opponent's defence.The teams of company Q know each other's strengths and therefore arrange their teams optimally. Identify the team that is guaranteed to win (if both teams act optimally) or tell that there is no such team.", "input_spec": "The input contain the players' description in four lines. The i-th line contains two space-separated integers ai and bi (1\u2009\u2264\u2009ai,\u2009bi\u2009\u2264\u2009100) \u2014 the defence and the attack skill of the i-th player, correspondingly.", "output_spec": "If the first team can win, print phrase \"Team 1\" (without the quotes), if the second team can win, print phrase \"Team 2\" (without the quotes). If no of the teams can definitely win, print \"Draw\" (without the quotes).", "sample_inputs": ["1 100\n100 1\n99 99\n99 99", "1 1\n2 2\n3 3\n2 2", "3 3\n2 2\n1 1\n2 2"], "sample_outputs": ["Team 1", "Team 2", "Draw"], "notes": "NoteLet consider the first test sample. The first team can definitely win if it will choose the following arrangement: the first player plays attack, the second player plays defence.Consider the second sample. The order of the choosing roles for players makes sense in this sample. As the members of the first team choose first, the members of the second team can beat them (because they know the exact defence value and attack value of the first team)."}, "src_uid": "1a70ed6f58028a7c7a86e73c28ff245f"}
{"nl": {"description": "Sereja owns a restaurant for n people. The restaurant hall has a coat rack with n hooks. Each restaurant visitor can use a hook to hang his clothes on it. Using the i-th hook costs ai rubles. Only one person can hang clothes on one hook.Tonight Sereja expects m guests in the restaurant. Naturally, each guest wants to hang his clothes on an available hook with minimum price (if there are multiple such hooks, he chooses any of them). However if the moment a guest arrives the rack has no available hooks, Sereja must pay a d ruble fine to the guest. Help Sereja find out the profit in rubles (possibly negative) that he will get tonight. You can assume that before the guests arrive, all hooks on the rack are available, all guests come at different time, nobody besides the m guests is visiting Sereja's restaurant tonight.", "input_spec": "The first line contains two integers n and d (1\u2009\u2264\u2009n,\u2009d\u2009\u2264\u2009100). The next line contains integers a1, a2, ..., an (1\u2009\u2264\u2009ai\u2009\u2264\u2009100). The third line contains integer m (1\u2009\u2264\u2009m\u2009\u2264\u2009100).", "output_spec": "In a single line print a single integer \u2014 the answer to the problem.", "sample_inputs": ["2 1\n2 1\n2", "2 1\n2 1\n10"], "sample_outputs": ["3", "-5"], "notes": "NoteIn the first test both hooks will be used, so Sereja gets 1\u2009+\u20092\u2009=\u20093 rubles.In the second test both hooks will be used but Sereja pays a fine 8 times, so the answer is 3\u2009-\u20098\u2009=\u2009\u2009-\u20095."}, "src_uid": "5c21e2dd658825580522af525142397d"}
{"nl": {"description": "One day Igor K. stopped programming and took up math. One late autumn evening he was sitting at a table reading a book and thinking about something. The following statement caught his attention: \"Among any six people there are either three pairwise acquainted people or three pairwise unacquainted people\"Igor just couldn't get why the required minimum is 6 people. \"Well, that's the same for five people, too!\" \u2014 he kept on repeating in his mind. \u2014 \"Let's take, say, Max, Ilya, Vova \u2014 here, they all know each other! And now let's add Dima and Oleg to Vova \u2014 none of them is acquainted with each other! Now, that math is just rubbish!\"Igor K. took 5 friends of his and wrote down who of them is friends with whom. Now he wants to check whether it is true for the five people that among them there are either three pairwise acquainted or three pairwise not acquainted people.", "input_spec": "The first line contains an integer m (0\u2009\u2264\u2009m\u2009\u2264\u200910), which is the number of relations of acquaintances among the five friends of Igor's. Each of the following m lines contains two integers ai and bi (1\u2009\u2264\u2009ai,\u2009bi\u2009\u2264\u20095;ai\u2009\u2260\u2009bi), where (ai,\u2009bi) is a pair of acquainted people. It is guaranteed that each pair of the acquaintances is described exactly once. The acquaintance relation is symmetrical, i.e. if x is acquainted with y, then y is also acquainted with x.", "output_spec": "Print \"FAIL\", if among those five people there are no either three pairwise acquainted or three pairwise unacquainted people. Otherwise print \"WIN\".", "sample_inputs": ["4\n1 3\n2 3\n1 4\n5 3", "5\n1 2\n2 3\n3 4\n4 5\n5 1"], "sample_outputs": ["WIN", "FAIL"], "notes": null}, "src_uid": "2bc18799c85ecaba87564a86a94e0322"}
{"nl": {"description": "Bizon the Champion isn't just a bison. He also is a favorite of the \"Bizons\" team.At a competition the \"Bizons\" got the following problem: \"You are given two distinct words (strings of English letters), s and t. You need to transform word s into word t\". The task looked simple to the guys because they know the suffix data structures well. Bizon Senior loves suffix automaton. By applying it once to a string, he can remove from this string any single character. Bizon Middle knows suffix array well. By applying it once to a string, he can swap any two characters of this string. The guys do not know anything about the suffix tree, but it can help them do much more. Bizon the Champion wonders whether the \"Bizons\" can solve the problem. Perhaps, the solution do not require both data structures. Find out whether the guys can solve the problem and if they can, how do they do it? Can they solve it either only with use of suffix automaton or only with use of suffix array or they need both structures? Note that any structure may be used an unlimited number of times, the structures may be used in any order.", "input_spec": "The first line contains a non-empty word s. The second line contains a non-empty word t. Words s and t are different. Each word consists only of lowercase English letters. Each word contains at most 100 letters.", "output_spec": "In the single line print the answer to the problem. Print \"need tree\" (without the quotes) if word s cannot be transformed into word t even with use of both suffix array and suffix automaton. Print \"automaton\" (without the quotes) if you need only the suffix automaton to solve the problem. Print \"array\" (without the quotes) if you need only the suffix array to solve the problem. Print \"both\" (without the quotes), if you need both data structures to solve the problem. It's guaranteed that if you can solve the problem only with use of suffix array, then it is impossible to solve it only with use of suffix automaton. This is also true for suffix automaton.", "sample_inputs": ["automaton\ntomat", "array\narary", "both\nhot", "need\ntree"], "sample_outputs": ["automaton", "array", "both", "need tree"], "notes": "NoteIn the third sample you can act like that: first transform \"both\" into \"oth\" by removing the first character using the suffix automaton and then make two swaps of the string using the suffix array and get \"hot\"."}, "src_uid": "edb9d51e009a59a340d7d589bb335c14"}
{"nl": {"description": "In order to make the \"Sea Battle\" game more interesting, Boris decided to add a new ship type to it. The ship consists of two rectangles. The first rectangle has a width of $$$w_1$$$ and a height of $$$h_1$$$, while the second rectangle has a width of $$$w_2$$$ and a height of $$$h_2$$$, where $$$w_1 \\ge w_2$$$. In this game, exactly one ship is used, made up of two rectangles. There are no other ships on the field.The rectangles are placed on field in the following way:  the second rectangle is on top the first rectangle;  they are aligned to the left, i.e. their left sides are on the same line;  the rectangles are adjacent to each other without a gap. See the pictures in the notes: the first rectangle is colored red, the second rectangle is colored blue.Formally, let's introduce a coordinate system. Then, the leftmost bottom cell of the first rectangle has coordinates $$$(1, 1)$$$, the rightmost top cell of the first rectangle has coordinates $$$(w_1, h_1)$$$, the leftmost bottom cell of the second rectangle has coordinates $$$(1, h_1 + 1)$$$ and the rightmost top cell of the second rectangle has coordinates $$$(w_2, h_1 + h_2)$$$.After the ship is completely destroyed, all cells neighboring by side or a corner with the ship are marked. Of course, only cells, which don't belong to the ship are marked. On the pictures in the notes such cells are colored green.Find out how many cells should be marked after the ship is destroyed. The field of the game is infinite in any direction.", "input_spec": "Four lines contain integers $$$w_1, h_1, w_2$$$ and $$$h_2$$$ ($$$1 \\leq w_1, h_1, w_2, h_2 \\leq 10^8$$$, $$$w_1 \\ge w_2$$$)\u00a0\u2014 the width of the first rectangle, the height of the first rectangle, the width of the second rectangle and the height of the second rectangle. You can't rotate the rectangles.", "output_spec": "Print exactly one integer\u00a0\u2014 the number of cells, which should be marked after the ship is destroyed.", "sample_inputs": ["2 1 2 1", "2 2 1 2"], "sample_outputs": ["12", "16"], "notes": "NoteIn the first example the field looks as follows (the first rectangle is red, the second rectangle is blue, green shows the marked squares):  In the second example the field looks as:  "}, "src_uid": "b5d44e0041053c996938aadd1b3865f6"}
{"nl": {"description": "Iahub and his friend Floyd have started painting a wall. Iahub is painting the wall red and Floyd is painting it pink. You can consider the wall being made of a very large number of bricks, numbered 1, 2, 3 and so on. Iahub has the following scheme of painting: he skips x\u2009-\u20091 consecutive bricks, then he paints the x-th one. That is, he'll paint bricks x, 2\u00b7x, 3\u00b7x and so on red. Similarly, Floyd skips y\u2009-\u20091 consecutive bricks, then he paints the y-th one. Hence he'll paint bricks y, 2\u00b7y, 3\u00b7y and so on pink.After painting the wall all day, the boys observed that some bricks are painted both red and pink. Iahub has a lucky number a and Floyd has a lucky number b. Boys wonder how many bricks numbered no less than a and no greater than b are painted both red and pink. This is exactly your task: compute and print the answer to the question. ", "input_spec": "The input will have a single line containing four integers in this order: x, y, a, b. (1\u2009\u2264\u2009x,\u2009y\u2009\u2264\u20091000, 1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u20092\u00b7109, a\u2009\u2264\u2009b).", "output_spec": "Output a single integer \u2014 the number of bricks numbered no less than a and no greater than b that are painted both red and pink.", "sample_inputs": ["2 3 6 18"], "sample_outputs": ["3"], "notes": "NoteLet's look at the bricks from a to b (a\u2009=\u20096,\u2009b\u2009=\u200918). The bricks colored in red are numbered 6, 8, 10, 12, 14, 16, 18. The bricks colored in pink are numbered 6, 9, 12, 15, 18. The bricks colored in both red and pink are numbered with 6, 12 and 18. "}, "src_uid": "c7aa8a95d5f8832015853cffa1374c48"}
{"nl": {"description": "Alas, finding one's true love is not easy. Masha has been unsuccessful in that yet. Her friend Dasha told Masha about a way to determine the phone number of one's Prince Charming through arithmancy. The phone number is divined like that. First one needs to write down one's own phone numbers. For example, let's suppose that Masha's phone number is 12345. After that one should write her favorite digit from 0 to 9 under the first digit of her number. That will be the first digit of the needed number. For example, Masha's favorite digit is 9. The second digit is determined as a half sum of the second digit of Masha's number and the already written down first digit from her beloved one's number. In this case the arithmetic average equals to (2\u2009+\u20099)\u2009/\u20092\u2009=\u20095.5. Masha can round the number up or down, depending on her wishes. For example, she chooses the digit 5. Having written down the resulting digit under the second digit of her number, Masha moves to finding the third digit in the same way, i.e. finding the half sum the the third digit of her number and the second digit of the new number. The result is (5\u2009+\u20093)\u2009/\u20092\u2009=\u20094. In this case the answer is unique. Thus, every i-th digit is determined as an arithmetic average of the i-th digit of Masha's number and the i\u2009-\u20091-th digit of her true love's number. If needed, the digit can be rounded up or down. For example, Masha can get: 12345 95444 Unfortunately, when Masha tried dialing the number, she got disappointed: as it turned out, the number was unavailable or outside the coverage area. But Masha won't give up. Perhaps, she rounded to a wrong digit or chose the first digit badly. That's why she keeps finding more and more new numbers and calling them. Count the number of numbers Masha calls. Masha calls all the possible numbers that can be found by the described means of arithmancy, except for, perhaps, her own one.", "input_spec": "The first line contains nonempty sequence consisting of digits from 0 to 9 \u2014 Masha's phone number. The sequence length does not exceed 50.", "output_spec": "Output the single number \u2014 the number of phone numbers Masha will dial.", "sample_inputs": ["12345", "09"], "sample_outputs": ["48", "15"], "notes": null}, "src_uid": "2dd8bb6e8182278d037aa3a59ca3517b"}
{"nl": {"description": "Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.Petya and his friend Vasya play an interesting game. Petya randomly chooses an integer p from the interval [pl,\u2009pr] and Vasya chooses an integer v from the interval [vl,\u2009vr] (also randomly). Both players choose their integers equiprobably. Find the probability that the interval [min(v,\u2009p),\u2009max(v,\u2009p)] contains exactly k lucky numbers.", "input_spec": "The single line contains five integers pl, pr, vl, vr and k (1\u2009\u2264\u2009pl\u2009\u2264\u2009pr\u2009\u2264\u2009109,\u20091\u2009\u2264\u2009vl\u2009\u2264\u2009vr\u2009\u2264\u2009109,\u20091\u2009\u2264\u2009k\u2009\u2264\u20091000).", "output_spec": "On the single line print the result with an absolute error of no more than 10\u2009-\u20099.", "sample_inputs": ["1 10 1 10 2", "5 6 8 10 1"], "sample_outputs": ["0.320000000000", "1.000000000000"], "notes": "NoteConsider that [a,\u2009b] denotes an interval of integers; this interval includes the boundaries. That is, In first case there are 32 suitable pairs: (1,\u20097),\u2009(1,\u20098),\u2009(1,\u20099),\u2009(1,\u200910),\u2009(2,\u20097),\u2009(2,\u20098),\u2009(2,\u20099),\u2009(2,\u200910),\u2009(3,\u20097),\u2009(3,\u20098),\u2009(3,\u20099),\u2009(3,\u200910),\u2009(4,\u20097),\u2009(4,\u20098),\u2009(4,\u20099),\u2009(4,\u200910),\u2009(7,\u20091),\u2009(7,\u20092),\u2009(7,\u20093),\u2009(7,\u20094),\u2009(8,\u20091),\u2009(8,\u20092),\u2009(8,\u20093),\u2009(8,\u20094),\u2009(9,\u20091),\u2009(9,\u20092),\u2009(9,\u20093),\u2009(9,\u20094),\u2009(10,\u20091),\u2009(10,\u20092),\u2009(10,\u20093),\u2009(10,\u20094). Total number of possible pairs is 10\u00b710\u2009=\u2009100, so answer is 32\u2009/\u2009100.In second case Petya always get number less than Vasya and the only lucky 7 is between this numbers, so there will be always 1 lucky number."}, "src_uid": "5d76ec741a9d873ce9d7c3ef55eb984c"}
{"nl": {"description": "It is the easy version of the problem. The difference is that in this version, there are no nodes with already chosen colors.Theofanis is starving, and he wants to eat his favorite food, sheftalia. However, he should first finish his homework. Can you help him with this problem?You have a perfect binary tree of $$$2^k - 1$$$ nodes\u00a0\u2014 a binary tree where all vertices $$$i$$$ from $$$1$$$ to $$$2^{k - 1} - 1$$$ have exactly two children: vertices $$$2i$$$ and $$$2i + 1$$$. Vertices from $$$2^{k - 1}$$$ to $$$2^k - 1$$$ don't have any children. You want to color its vertices with the $$$6$$$ Rubik's cube colors (White, Green, Red, Blue, Orange and Yellow).Let's call a coloring good when all edges connect nodes with colors that are neighboring sides in the Rubik's cube.  A picture of Rubik's cube and its 2D map. More formally:   a white node can not be neighboring with white and yellow nodes;  a yellow node can not be neighboring with white and yellow nodes;  a green node can not be neighboring with green and blue nodes;  a blue node can not be neighboring with green and blue nodes;  a red node can not be neighboring with red and orange nodes;  an orange node can not be neighboring with red and orange nodes; You want to calculate the number of the good colorings of the binary tree. Two colorings are considered different if at least one node is colored with a different color.The answer may be too large, so output the answer modulo $$$10^9+7$$$.", "input_spec": "The first and only line contains the integers $$$k$$$ ($$$1 \\le k \\le 60$$$)\u00a0\u2014 the number of levels in the perfect binary tree you need to color.", "output_spec": "Print one integer\u00a0\u2014 the number of the different colorings modulo $$$10^9+7$$$.", "sample_inputs": ["3", "14"], "sample_outputs": ["24576", "934234"], "notes": "NoteIn the picture below, you can see one of the correct colorings of the first example.  "}, "src_uid": "5144b9b281ea4087d8334d91c3c8bda4"}
{"nl": {"description": "A long time ago (probably even in the first book), Nicholas Flamel, a great alchemist and the creator of the Philosopher's Stone, taught Harry Potter three useful spells. The first one allows you to convert a grams of sand into b grams of lead, the second one allows you to convert c grams of lead into d grams of gold and third one allows you to convert e grams of gold into f grams of sand. When Harry told his friends about these spells, Ron Weasley was amazed. After all, if they succeed in turning sand into lead, lead into gold, and then turning part of the gold into sand again and so on, then it will be possible to start with a small amount of sand and get huge amounts of gold! Even an infinite amount of gold! Hermione Granger, by contrast, was skeptical about that idea. She argues that according to the law of conservation of matter getting an infinite amount of matter, even using magic, is impossible. On the contrary, the amount of matter may even decrease during transformation, being converted to magical energy. Though Hermione's theory seems convincing, Ron won't believe her. As far as Ron is concerned, Hermione made up her law of conservation of matter to stop Harry and Ron wasting their time with this nonsense, and to make them go and do homework instead. That's why Ron has already collected a certain amount of sand for the experiments. A quarrel between the friends seems unavoidable...Help Harry to determine which one of his friends is right, and avoid the quarrel after all. To do this you have to figure out whether it is possible to get the amount of gold greater than any preassigned number from some finite amount of sand.", "input_spec": "The first line contains 6 integers a, b, c, d, e, f (0\u2009\u2264\u2009a,\u2009b,\u2009c,\u2009d,\u2009e,\u2009f\u2009\u2264\u20091000).", "output_spec": "Print \"Ron\", if it is possible to get an infinitely large amount of gold having a certain finite amount of sand (and not having any gold and lead at all), i.e., Ron is right. Otherwise, print \"Hermione\".", "sample_inputs": ["100 200 250 150 200 250", "100 50 50 200 200 100", "100 10 200 20 300 30", "0 0 0 0 0 0", "1 1 0 1 1 1", "1 0 1 2 1 2", "100 1 100 1 0 1"], "sample_outputs": ["Ron", "Hermione", "Hermione", "Hermione", "Ron", "Hermione", "Ron"], "notes": "NoteConsider the first sample. Let's start with the 500 grams of sand. Apply the first spell 5 times and turn the sand into 1000 grams of lead. Then apply the second spell 4 times to get 600 grams of gold. Let\u2019s take 400 grams from the resulting amount of gold turn them back into sand. We get 500 grams of sand and 200 grams of gold. If we apply the same operations to 500 grams of sand again, we can get extra 200 grams of gold every time. Thus, you can get 200, 400, 600 etc. grams of gold, i.e., starting with a finite amount of sand (500 grams), you can get the amount of gold which is greater than any preassigned number.In the forth sample it is impossible to get sand, or lead, or gold, applying the spells.In the fifth sample an infinitely large amount of gold can be obtained by using only the second spell, which allows you to receive 1 gram of gold out of nothing. Note that if such a second spell is available, then the first and the third one do not affect the answer at all.The seventh sample is more interesting. We can also start with a zero amount of sand there. With the aid of the third spell you can get sand out of nothing. We get 10000 grams of sand in this manner. Let's get 100 grams of lead using the first spell 100 times. Then make 1 gram of gold from them. We managed to receive 1 gram of gold, starting with a zero amount of sand! Clearly, in this manner you can get an infinitely large amount of gold."}, "src_uid": "44d608de3e1447f89070e707ba550150"}
{"nl": {"description": "The Cybermen and the Daleks have long been the Doctor's main enemies. Everyone knows that both these species enjoy destroying everything they encounter. However, a little-known fact about them is that they both also love taking Turing tests!Heidi designed a series of increasingly difficult tasks for them to spend their time on, which would allow the Doctor enough time to save innocent lives!The funny part is that these tasks would be very easy for a human to solve.The first task is as follows. There are some points on the plane. All but one of them are on the boundary of an axis-aligned square (its sides are parallel to the axes). Identify that point.", "input_spec": "The first line contains an integer $$$n$$$ ($$$2 \\le n \\le 10$$$). Each of the following $$$4n + 1$$$ lines contains two integers $$$x_i, y_i$$$ ($$$0 \\leq x_i, y_i \\leq 50$$$), describing the coordinates of the next point. It is guaranteed that there are at least $$$n$$$ points on each side of the square and all $$$4n + 1$$$ points are distinct.", "output_spec": "Print two integers\u00a0\u2014 the coordinates of the point that is not on the boundary of the square.", "sample_inputs": ["2\n0 0\n0 1\n0 2\n1 0\n1 1\n1 2\n2 0\n2 1\n2 2", "2\n0 0\n0 1\n0 2\n0 3\n1 0\n1 2\n2 0\n2 1\n2 2"], "sample_outputs": ["1 1", "0 3"], "notes": "NoteIn both examples, the square has four sides $$$x=0$$$, $$$x=2$$$, $$$y=0$$$, $$$y=2$$$."}, "src_uid": "1f9153088dcba9383b1a2dbe592e4d06"}
{"nl": {"description": "Mr. Funt now lives in a country with a very specific tax laws. The total income of mr. Funt during this year is equal to n (n\u2009\u2265\u20092) burles and the amount of tax he has to pay is calculated as the maximum divisor of n (not equal to n, of course). For example, if n\u2009=\u20096 then Funt has to pay 3 burles, while for n\u2009=\u200925 he needs to pay 5 and if n\u2009=\u20092 he pays only 1 burle.As mr. Funt is a very opportunistic person he wants to cheat a bit. In particular, he wants to split the initial n in several parts n1\u2009+\u2009n2\u2009+\u2009...\u2009+\u2009nk\u2009=\u2009n (here k is arbitrary, even k\u2009=\u20091 is allowed) and pay the taxes for each part separately. He can't make some part equal to 1 because it will reveal him. So, the condition ni\u2009\u2265\u20092 should hold for all i from 1 to k.Ostap Bender wonders, how many money Funt has to pay (i.e. minimal) if he chooses and optimal way to split n in parts.", "input_spec": "The first line of the input contains a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u20092\u00b7109)\u00a0\u2014 the total year income of mr. Funt.", "output_spec": "Print one integer\u00a0\u2014 minimum possible number of burles that mr. Funt has to pay as a tax.", "sample_inputs": ["4", "27"], "sample_outputs": ["2", "3"], "notes": null}, "src_uid": "684ce84149d6a5f4776ecd1ea6cb455b"}
{"nl": {"description": "Polycarp likes squares and cubes of positive integers. Here is the beginning of the sequence of numbers he likes: $$$1$$$, $$$4$$$, $$$8$$$, $$$9$$$, ....For a given number $$$n$$$, count the number of integers from $$$1$$$ to $$$n$$$ that Polycarp likes. In other words, find the number of such $$$x$$$ that $$$x$$$ is a square of a positive integer number or a cube of a positive integer number (or both a square and a cube simultaneously).", "input_spec": "The first line contains an integer $$$t$$$ ($$$1 \\le t \\le 20$$$) \u2014 the number of test cases. Then $$$t$$$ lines contain the test cases, one per line. Each of the lines contains one integer $$$n$$$ ($$$1 \\le n \\le 10^9$$$).", "output_spec": "For each test case, print the answer you are looking for \u2014 the number of integers from $$$1$$$ to $$$n$$$ that Polycarp likes.", "sample_inputs": ["6\n10\n1\n25\n1000000000\n999999999\n500000000"], "sample_outputs": ["4\n1\n6\n32591\n32590\n23125"], "notes": null}, "src_uid": "015afbefe1514a0e18fcb9286c7b6624"}
{"nl": {"description": "When Petya went to school, he got interested in large numbers and what they were called in ancient times. For instance, he learned that the Russian word \"tma\" (which now means \"too much to be counted\") used to stand for a thousand and \"tma tmyschaya\" (which literally means \"the tma of tmas\") used to stand for a million.Petya wanted to modernize the words we use for numbers and invented a word petricium that represents number k. Moreover, petricium la petricium stands for number k2, petricium la petricium la petricium stands for k3 and so on. All numbers of this form are called petriciumus cifera, and the number's importance is the number of articles la in its title.Petya's invention brought on a challenge that needed to be solved quickly: does some number l belong to the set petriciumus cifera? As Petya is a very busy schoolboy he needs to automate the process, he asked you to solve it.", "input_spec": "The first input line contains integer number k, the second line contains integer number l (2\u2009\u2264\u2009k,\u2009l\u2009\u2264\u2009231\u2009-\u20091).", "output_spec": "You should print in the first line of the output \"YES\", if the number belongs to the set petriciumus cifera and otherwise print \"NO\". If the number belongs to the set, then print on the seconds line the only number \u2014 the importance of number l.", "sample_inputs": ["5\n25", "3\n8"], "sample_outputs": ["YES\n1", "NO"], "notes": null}, "src_uid": "8ce89b754aa4080e7c3b2c3b10f4be46"}
{"nl": {"description": "It's been long after the events of the previous problems, and Karen has now moved on from student life and is looking to relocate to a new neighborhood.  The neighborhood consists of n houses in a straight line, labelled 1 to n from left to right, all an equal distance apart.Everyone in this neighborhood loves peace and quiet. Because of this, whenever a new person moves into the neighborhood, he or she always chooses the house whose minimum distance to any occupied house is maximized. If there are multiple houses with the maximum possible minimum distance, he or she chooses the leftmost one.Note that the first person to arrive always moves into house 1.Karen is the k-th person to enter this neighborhood. If everyone, including herself, follows this rule, which house will she move into?", "input_spec": "The first and only line of input contains two integers, n and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u20091018), describing the number of houses in the neighborhood, and that Karen was the k-th person to move in, respectively.", "output_spec": "Output a single integer on a line by itself, the label of the house Karen will move into.", "sample_inputs": ["6 4", "39 3"], "sample_outputs": ["2", "20"], "notes": "NoteIn the first test case, there are 6 houses in the neighborhood, and Karen is the fourth person to move in:  The first person moves into house 1.  The second person moves into house 6.  The third person moves into house 3.  The fourth person moves into house 2. In the second test case, there are 39 houses in the neighborhood, and Karen is the third person to move in:  The first person moves into house 1.  The second person moves into house 39.  The third person moves into house 20. "}, "src_uid": "eb311bde6a0e3244d92fafbd4aa1e61f"}
{"nl": {"description": "This problem's actual name, \"Lexicographically Largest Palindromic Subsequence\" is too long to fit into the page headline.You are given string s consisting of lowercase English letters only. Find its lexicographically largest palindromic subsequence.We'll call a non-empty string s[p1p2... pk] = sp1sp2... spk (1 \u2009\u2264\u2009 p1\u2009<\u2009p2\u2009<\u2009...\u2009<\u2009pk \u2009\u2264\u2009 |s|) a subsequence of string s = s1s2... s|s|, where |s| is the length of string s. For example, strings \"abcb\", \"b\" and \"abacaba\" are subsequences of string \"abacaba\".String x = x1x2... x|x| is lexicographically larger than string y = y1y2... y|y| if either |x| > |y| and x1\u2009=\u2009y1, x2\u2009=\u2009y2, ...,\u2009x|y|\u2009=\u2009y|y|, or there exists such number r (r\u2009<\u2009|x|, r\u2009<\u2009|y|) that x1\u2009=\u2009y1, x2\u2009=\u2009y2, ..., xr\u2009=\u2009yr and xr\u2009\u2009+\u2009\u20091\u2009>\u2009yr\u2009\u2009+\u2009\u20091. Characters in the strings are compared according to their ASCII codes. For example, string \"ranger\" is lexicographically larger than string \"racecar\" and string \"poster\" is lexicographically larger than string \"post\".String s = s1s2... s|s| is a palindrome if it matches string rev(s) = s|s|s|s|\u2009-\u20091... s1. In other words, a string is a palindrome if it reads the same way from left to right and from right to left. For example, palindromic strings are \"racecar\", \"refer\" and \"z\".", "input_spec": "The only input line contains a non-empty string s consisting of lowercase English letters only. Its length does not exceed 10.", "output_spec": "Print the lexicographically largest palindromic subsequence of string s.", "sample_inputs": ["radar", "bowwowwow", "codeforces", "mississipp"], "sample_outputs": ["rr", "wwwww", "s", "ssss"], "notes": "NoteAmong all distinct subsequences of string \"radar\" the following ones are palindromes: \"a\", \"d\", \"r\", \"aa\", \"rr\", \"ada\", \"rar\", \"rdr\", \"raar\" and \"radar\". The lexicographically largest of them is \"rr\"."}, "src_uid": "9a40e9b122962a1f83b74ddee6246a40"}
{"nl": {"description": "International Abbreviation Olympiad takes place annually starting from 1989. Each year the competition receives an abbreviation of form IAO'y, where y stands for some number of consequent last digits of the current year. Organizers always pick an abbreviation with non-empty string y that has never been used before. Among all such valid abbreviations they choose the shortest one and announce it to be the abbreviation of this year's competition.For example, the first three Olympiads (years 1989, 1990 and 1991, respectively) received the abbreviations IAO'9, IAO'0 and IAO'1, while the competition in 2015 received an abbreviation IAO'15, as IAO'5 has been already used in 1995.You are given a list of abbreviations. For each of them determine the year it stands for.", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091000)\u00a0\u2014 the number of abbreviations to process.  Then n lines follow, each containing a single abbreviation. It's guaranteed that each abbreviation contains at most nine digits.", "output_spec": "For each abbreviation given in the input, find the year of the corresponding Olympiad.", "sample_inputs": ["5\nIAO'15\nIAO'2015\nIAO'1\nIAO'9\nIAO'0", "4\nIAO'9\nIAO'99\nIAO'999\nIAO'9999"], "sample_outputs": ["2015\n12015\n1991\n1989\n1990", "1989\n1999\n2999\n9999"], "notes": null}, "src_uid": "31be4d38a8b5ea8738a65bfee24a5a21"}
{"nl": {"description": "There are $$$n$$$ students in a school class, the rating of the $$$i$$$-th student on Codehorses is $$$a_i$$$. You have to form a team consisting of $$$k$$$ students ($$$1 \\le k \\le n$$$) such that the ratings of all team members are distinct.If it is impossible to form a suitable team, print \"NO\" (without quotes). Otherwise print \"YES\", and then print $$$k$$$ distinct numbers which should be the indices of students in the team you form. If there are multiple answers, print any of them.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le k \\le n \\le 100$$$) \u2014 the number of students and the size of the team you have to form. The second line contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 100$$$), where $$$a_i$$$ is the rating of $$$i$$$-th student.", "output_spec": "If it is impossible to form a suitable team, print \"NO\" (without quotes). Otherwise print \"YES\", and then print $$$k$$$ distinct integers from $$$1$$$ to $$$n$$$ which should be the indices of students in the team you form. All the ratings of the students in the team should be distinct. You may print the indices in any order. If there are multiple answers, print any of them. Assume that the students are numbered from $$$1$$$ to $$$n$$$.", "sample_inputs": ["5 3\n15 13 15 15 12", "5 4\n15 13 15 15 12", "4 4\n20 10 40 30"], "sample_outputs": ["YES\n1 2 5", "NO", "YES\n1 2 3 4"], "notes": "NoteAll possible answers for the first example:   {1 2 5}  {2 3 5}  {2 4 5} Note that the order does not matter."}, "src_uid": "5de6574d57ab04ca195143e08d28d0ad"}
{"nl": {"description": "Many people are aware of DMCA \u2013 Digital Millennium Copyright Act. But another recently proposed DMCA \u2013 Digital Millennium Calculation Act \u2013 is much less known.In this problem you need to find a root of a number according to this new DMCA law.", "input_spec": "The input contains a single integer $$$a$$$ ($$$1 \\le a \\le 1000000$$$).", "output_spec": "Output the result \u2013 an integer number.", "sample_inputs": ["1", "81"], "sample_outputs": ["1", "9"], "notes": null}, "src_uid": "477a67877367dc68b3bf5143120ff45d"}
{"nl": {"description": "    *The two images are equivalent, feel free to use either one.", "input_spec": "The input contains a single integer $$$a$$$ ($$$-100 \\le a \\le 100$$$).", "output_spec": "Output the result \u2013 an integer number.", "sample_inputs": ["1"], "sample_outputs": ["1"], "notes": null}, "src_uid": "f76005f888df46dac38b0f159ca04d5f"}
{"nl": {"description": "Vasya has n pairs of socks. In the morning of each day Vasya has to put on a pair of socks before he goes to school. When he comes home in the evening, Vasya takes off the used socks and throws them away. Every m-th day (at days with numbers m,\u20092m,\u20093m,\u2009...) mom buys a pair of socks to Vasya. She does it late in the evening, so that Vasya cannot put on a new pair of socks before the next day. How many consecutive days pass until Vasya runs out of socks?", "input_spec": "The single line contains two integers n and m (1\u2009\u2264\u2009n\u2009\u2264\u2009100;\u00a02\u2009\u2264\u2009m\u2009\u2264\u2009100), separated by a space.", "output_spec": "Print a single integer \u2014 the answer to the problem.", "sample_inputs": ["2 2", "9 3"], "sample_outputs": ["3", "13"], "notes": "NoteIn the first sample Vasya spends the first two days wearing the socks that he had initially. Then on day three he puts on the socks that were bought on day two.In the second sample Vasya spends the first nine days wearing the socks that he had initially. Then he spends three days wearing the socks that were bought on the third, sixth and ninth days. Than he spends another day wearing the socks that were bought on the twelfth day."}, "src_uid": "42b25b7335ec01794fbb1d4086aa9dd0"}
{"nl": {"description": "InputThe first line of the input contains a single integer $$$N$$$ ($$$1 \\le N \\le 24$$$). The next $$$N$$$ lines contain $$$5$$$ space-separated integers each. The first three integers will be between 0 and 2, inclusive. The last two integers will be between 0 and 3, inclusive. The sum of the first three integers will be equal to the sum of the last two integers.OutputOutput the result \u2013 a string of lowercase English letters.ExamplesInput\n1\n1 0 0 1 0\nOutput\na\nInput\n10\n2 0 0 1 1\n1 1 1 2 1\n2 1 0 1 2\n1 1 0 1 1\n2 1 0 2 1\n1 1 1 2 1\n1 2 1 3 1\n2 0 0 1 1\n1 1 0 1 1\n1 1 2 2 2\nOutput\ncodeforcez\n", "input_spec": "The first line of the input contains a single integer $$$N$$$ ($$$1 \\le N \\le 24$$$). The next $$$N$$$ lines contain $$$5$$$ space-separated integers each. The first three integers will be between 0 and 2, inclusive. The last two integers will be between 0 and 3, inclusive. The sum of the first three integers will be equal to the sum of the last two integers.", "output_spec": "Output the result \u2013 a string of lowercase English letters.", "sample_inputs": ["1\n1 0 0 1 0", "10\n2 0 0 1 1\n1 1 1 2 1\n2 1 0 1 2\n1 1 0 1 1\n2 1 0 2 1\n1 1 1 2 1\n1 2 1 3 1\n2 0 0 1 1\n1 1 0 1 1\n1 1 2 2 2"], "sample_outputs": ["a", "codeforcez"], "notes": null}, "src_uid": "a3603f5ed0d8bdb7fe829342991b78e6"}
{"nl": {"description": "This is the easy version of the problem. You can find the hard version in the Div. 1 contest. Both versions only differ in the number of times you can ask your friend to taste coffee.This is an interactive problem.You're considering moving to another city, where one of your friends already lives. There are $$$n$$$ caf\u00e9s in this city, where $$$n$$$ is a power of two. The $$$i$$$-th caf\u00e9 produces a single variety of coffee $$$a_i$$$. As you're a coffee-lover, before deciding to move or not, you want to know the number $$$d$$$ of distinct varieties of coffees produced in this city.You don't know the values $$$a_1, \\ldots, a_n$$$. Fortunately, your friend has a memory of size $$$k$$$, where $$$k$$$ is a power of two.Once per day, you can ask him to taste a cup of coffee produced by the caf\u00e9 $$$c$$$, and he will tell you if he tasted a similar coffee during the last $$$k$$$ days.You can also ask him to take a medication that will reset his memory. He will forget all previous cups of coffee tasted. You can reset his memory at most $$$30\\ 000$$$ times.More formally, the memory of your friend is a queue $$$S$$$. Doing a query on caf\u00e9 $$$c$$$ will:   Tell you if $$$a_c$$$ is in $$$S$$$;  Add $$$a_c$$$ at the back of $$$S$$$;  If $$$|S| > k$$$, pop the front element of $$$S$$$. Doing a reset request will pop all elements out of $$$S$$$.Your friend can taste at most $$$\\dfrac{2n^2}{k}$$$ cups of coffee in total. Find the diversity $$$d$$$ (number of distinct values in the array $$$a$$$).Note that asking your friend to reset his memory does not count towards the number of times you ask your friend to taste a cup of coffee.In some test cases the behavior of the interactor is adaptive. It means that the array $$$a$$$ may be not fixed before the start of the interaction and may depend on your queries. It is guaranteed that at any moment of the interaction, there is at least one array $$$a$$$ consistent with all the answers given so far.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le k \\le n \\le 1024$$$, $$$k$$$ and $$$n$$$ are powers of two). It is guaranteed that $$$\\dfrac{2n^2}{k} \\le 20\\ 000$$$.", "output_spec": null, "sample_inputs": ["4 2\nN\nN\nY\nN\nN\nN\nN", "8 8\nN\nN\nN\nN\nY\nY"], "sample_outputs": ["? 1\n? 2\n? 3\n? 4\nR\n? 4\n? 1\n? 2\n! 3", "? 2\n? 6\n? 4\n? 5\n? 2\n? 5\n! 6"], "notes": "NoteIn the first example, the array is $$$a = [1, 4, 1, 3]$$$. The city produces $$$3$$$ different varieties of coffee ($$$1$$$, $$$3$$$ and $$$4$$$).The successive varieties of coffee tasted by your friend are $$$1, 4, \\textbf{1}, 3, 3, 1, 4$$$ (bold answers correspond to Y answers). Note that between the two ? 4 asks, there is a reset memory request R, so the answer to the second ? 4 ask is N. Had there been no reset memory request, the answer to the second ? 4 ask is Y.In the second example, the array is $$$a = [1, 2, 3, 4, 5, 6, 6, 6]$$$. The city produces $$$6$$$ different varieties of coffee.The successive varieties of coffee tasted by your friend are $$$2, 6, 4, 5, \\textbf{2}, \\textbf{5}$$$."}, "src_uid": "11ad68b4375456733526e74e72606d8d"}
{"nl": {"description": "Mancala is a game famous in the Middle East. It is played on a board that consists of 14 holes.   Initially, each hole has $$$a_i$$$ stones. When a player makes a move, he chooses a hole which contains a positive number of stones. He takes all the stones inside it and then redistributes these stones one by one in the next holes in a counter-clockwise direction.Note that the counter-clockwise order means if the player takes the stones from hole $$$i$$$, he will put one stone in the $$$(i+1)$$$-th hole, then in the $$$(i+2)$$$-th, etc. If he puts a stone in the $$$14$$$-th hole, the next one will be put in the first hole.After the move, the player collects all the stones from holes that contain even number of stones. The number of stones collected by player is the score, according to Resli.Resli is a famous Mancala player. He wants to know the maximum score he can obtain after one move.", "input_spec": "The only line contains 14 integers $$$a_1, a_2, \\ldots, a_{14}$$$ ($$$0 \\leq a_i \\leq 10^9$$$)\u00a0\u2014 the number of stones in each hole. It is guaranteed that for any $$$i$$$ ($$$1\\leq i \\leq 14$$$) $$$a_i$$$ is either zero or odd, and there is at least one stone in the board.", "output_spec": "Output one integer, the maximum possible score after one move.", "sample_inputs": ["0 1 1 0 0 0 0 0 0 7 0 0 0 0", "5 1 1 1 1 0 0 0 0 0 0 0 0 0"], "sample_outputs": ["4", "8"], "notes": "NoteIn the first test case the board after the move from the hole with $$$7$$$ stones will look like 1 2 2 0 0 0 0 0 0 0 1 1 1 1. Then the player collects the even numbers and ends up with a score equal to $$$4$$$."}, "src_uid": "1ac11153e35509e755ea15f1d57d156b"}
{"nl": {"description": "Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box). Since all the boxes have the same size, Ciel cannot put more than one box directly on the top of some box. For example, imagine Ciel has three boxes: the first has strength 2, the second has strength 1 and the third has strength 1. She cannot put the second and the third box simultaneously directly on the top of the first one. But she can put the second box directly on the top of the first one, and then the third box directly on the top of the second one. We will call such a construction of boxes a pile.Fox Ciel wants to construct piles from all the boxes. Each pile will contain some boxes from top to bottom, and there cannot be more than xi boxes on the top of i-th box. What is the minimal number of piles she needs to construct?", "input_spec": "The first line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100). The next line contains n integers x1,\u2009x2,\u2009...,\u2009xn (0\u2009\u2264\u2009xi\u2009\u2264\u2009100).", "output_spec": "Output a single integer \u2014 the minimal possible number of piles.", "sample_inputs": ["3\n0 0 10", "5\n0 1 2 3 4", "4\n0 0 0 0", "9\n0 1 0 2 0 1 1 2 10"], "sample_outputs": ["2", "1", "4", "3"], "notes": "NoteIn example 1, one optimal way is to build 2 piles: the first pile contains boxes 1 and 3 (from top to bottom), the second pile contains only box 2.In example 2, we can build only 1 pile that contains boxes 1, 2, 3, 4, 5 (from top to bottom)."}, "src_uid": "7c710ae68f27f140e7e03564492f7214"}
{"nl": {"description": "Any resemblance to any real championship and sport is accidental.The Berland National team takes part in the local Football championship which now has a group stage. Let's describe the formal rules of the local championship:   the team that kicked most balls in the enemy's goal area wins the game;  the victory gives 3 point to the team, the draw gives 1 point and the defeat gives 0 points;  a group consists of four teams, the teams are ranked by the results of six games: each team plays exactly once with each other team;  the teams that get places 1 and 2 in the group stage results, go to the next stage of the championship. In the group stage the team's place is defined by the total number of scored points: the more points, the higher the place is. If two or more teams have the same number of points, then the following criteria are used (the criteria are listed in the order of falling priority, starting from the most important one):   the difference between the total number of scored goals and the total number of missed goals in the championship: the team with a higher value gets a higher place;  the total number of scored goals in the championship: the team with a higher value gets a higher place;  the lexicographical order of the name of the teams' countries: the country with the lexicographically smaller name gets a higher place. The Berland team plays in the group where the results of 5 out of 6 games are already known. To be exact, there is the last game left. There the Berand national team plays with some other team. The coach asks you to find such score X:Y (where X is the number of goals Berland scored and Y is the number of goals the opponent scored in the game), that fulfills the following conditions:   X > Y, that is, Berland is going to win this game;  after the game Berland gets the 1st or the 2nd place in the group;  if there are multiple variants, you should choose such score X:Y, where value X\u2009-\u2009Y is minimum;  if it is still impossible to come up with one score, you should choose the score where value Y (the number of goals Berland misses) is minimum. ", "input_spec": "The input has five lines. Each line describes a game as \"team1 team2 goals1:goals2\" (without the quotes), what means that team team1 played a game with team team2, besides, team1 scored goals1 goals and team2 scored goals2 goals. The names of teams team1 and team2 are non-empty strings, consisting of uppercase English letters, with length of no more than 20 characters; goals1,\u2009goals2 are integers from 0 to 9.  The Berland team is called \"BERLAND\". It is guaranteed that the Berland team and one more team played exactly 2 games and the the other teams played exactly 3 games.", "output_spec": "Print the required score in the last game as X:Y, where X is the number of goals Berland scored and Y is the number of goals the opponent scored. If the Berland team does not get the first or the second place in the group, whatever this game's score is, then print on a single line \"IMPOSSIBLE\" (without the quotes). Note, that the result score can be very huge, 10:0 for example.", "sample_inputs": ["AERLAND DERLAND 2:1\nDERLAND CERLAND 0:3\nCERLAND AERLAND 0:1\nAERLAND BERLAND 2:0\nDERLAND BERLAND 4:0", "AERLAND DERLAND 2:2\nDERLAND CERLAND 2:3\nCERLAND AERLAND 1:3\nAERLAND BERLAND 2:1\nDERLAND BERLAND 4:1"], "sample_outputs": ["6:0", "IMPOSSIBLE"], "notes": "NoteIn the first sample \"BERLAND\" plays the last game with team \"CERLAND\". If Berland wins with score 6:0, the results' table looks like that in the end:   AERLAND (points: 9, the difference between scored and missed goals: 4, scored goals: 5)  BERLAND (points: 3, the difference between scored and missed goals: 0, scored goals: 6)  DERLAND (points: 3, the difference between scored and missed goals: 0, scored goals: 5)  CERLAND (points: 3, the difference between scored and missed goals: -4, scored goals: 3) In the second sample teams \"AERLAND\" and \"DERLAND\" have already won 7 and 4 points, respectively. The Berland team wins only 3 points, which is not enough to advance to the next championship stage."}, "src_uid": "5033d51c67b7ae0b1a2d9fd292fdced1"}
{"nl": {"description": "Can you imagine our life if we removed all zeros from it? For sure we will have many problems.In this problem we will have a simple example if we removed all zeros from our life, it's the addition operation. Let's assume you are given this equation a\u2009+\u2009b\u2009=\u2009c, where a and b are positive integers, and c is the sum of a and b. Now let's remove all zeros from this equation. Will the equation remain correct after removing all zeros?For example if the equation is 101\u2009+\u2009102\u2009=\u2009203, if we removed all zeros it will be 11\u2009+\u200912\u2009=\u200923 which is still a correct equation.But if the equation is 105\u2009+\u2009106\u2009=\u2009211, if we removed all zeros it will be 15\u2009+\u200916\u2009=\u2009211 which is not a correct equation.", "input_spec": "The input will consist of two lines, the first line will contain the integer a, and the second line will contain the integer b which are in the equation as described above (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109). There won't be any leading zeros in both. The value of c should be calculated as c\u2009=\u2009a\u2009+\u2009b.", "output_spec": "The output will be just one line, you should print \"YES\" if the equation will remain correct after removing all zeros, and print \"NO\" otherwise.", "sample_inputs": ["101\n102", "105\n106"], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "ac6971f4feea0662d82da8e0862031ad"}
{"nl": {"description": "Many students live in a dormitory. A dormitory is a whole new world of funny amusements and possibilities but it does have its drawbacks. There is only one shower and there are multiple students who wish to have a shower in the morning. That's why every morning there is a line of five people in front of the dormitory shower door. As soon as the shower opens, the first person from the line enters the shower. After a while the first person leaves the shower and the next person enters the shower. The process continues until everybody in the line has a shower.Having a shower takes some time, so the students in the line talk as they wait. At each moment of time the students talk in pairs: the (2i\u2009-\u20091)-th man in the line (for the current moment) talks with the (2i)-th one. Let's look at this process in more detail. Let's number the people from 1 to 5. Let's assume that the line initially looks as 23154 (person number 2 stands at the beginning of the line). Then, before the shower opens, 2 talks with 3, 1 talks with 5, 4 doesn't talk with anyone. Then 2 enters the shower. While 2 has a shower, 3 and 1 talk, 5 and 4 talk too. Then, 3 enters the shower. While 3 has a shower, 1 and 5 talk, 4 doesn't talk to anyone. Then 1 enters the shower and while he is there, 5 and 4 talk. Then 5 enters the shower, and then 4 enters the shower.We know that if students i and j talk, then the i-th student's happiness increases by gij and the j-th student's happiness increases by gji. Your task is to find such initial order of students in the line that the total happiness of all students will be maximum in the end. Please note that some pair of students may have a talk several times. In the example above students 1 and 5 talk while they wait for the shower to open and while 3 has a shower.", "input_spec": "The input consists of five lines, each line contains five space-separated integers: the j-th number in the i-th line shows gij (0\u2009\u2264\u2009gij\u2009\u2264\u2009105). It is guaranteed that gii\u2009=\u20090 for all i. Assume that the students are numbered from 1 to 5.", "output_spec": "Print a single integer \u2014 the maximum possible total happiness of the students.", "sample_inputs": ["0 0 0 0 9\n0 0 0 0 0\n0 0 0 0 0\n0 0 0 0 0\n7 0 0 0 0", "0 43 21 18 2\n3 0 21 11 65\n5 2 0 1 4\n54 62 12 0 99\n87 64 81 33 0"], "sample_outputs": ["32", "620"], "notes": "NoteIn the first sample, the optimal arrangement of the line is 23154. In this case, the total happiness equals:(g23\u2009+\u2009g32\u2009+\u2009g15\u2009+\u2009g51)\u2009+\u2009(g13\u2009+\u2009g31\u2009+\u2009g54\u2009+\u2009g45)\u2009+\u2009(g15\u2009+\u2009g51)\u2009+\u2009(g54\u2009+\u2009g45)\u2009=\u200932."}, "src_uid": "be6d4df20e9a48d183dd8f34531df246"}
{"nl": {"description": "Petya and Vasya decided to play a little. They found n red cubes and m blue cubes. The game goes like that: the players take turns to choose a cube of some color (red or blue) and put it in a line from left to right (overall the line will have n\u2009+\u2009m cubes). Petya moves first. Petya's task is to get as many pairs of neighbouring cubes of the same color as possible. Vasya's task is to get as many pairs of neighbouring cubes of different colors as possible. The number of Petya's points in the game is the number of pairs of neighboring cubes of the same color in the line, the number of Vasya's points in the game is the number of neighbouring cubes of the different color in the line. Your task is to calculate the score at the end of the game (Petya's and Vasya's points, correspondingly), if both boys are playing optimally well. To \"play optimally well\" first of all means to maximize the number of one's points, and second \u2014 to minimize the number of the opponent's points.", "input_spec": "The only line contains two space-separated integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009105) \u2014 the number of red and blue cubes, correspondingly.", "output_spec": "On a single line print two space-separated integers \u2014 the number of Petya's and Vasya's points correspondingly provided that both players play optimally well.", "sample_inputs": ["3 1", "2 4"], "sample_outputs": ["2 1", "3 2"], "notes": "NoteIn the first test sample the optimal strategy for Petya is to put the blue cube in the line. After that there will be only red cubes left, so by the end of the game the line of cubes from left to right will look as [blue, red, red, red]. So, Petya gets 2 points and Vasya gets 1 point. If Petya would choose the red cube during his first move, then, provided that both boys play optimally well, Petya would get 1 point and Vasya would get 2 points."}, "src_uid": "c8378e6fcaab30d15469a55419f38b39"}
{"nl": {"description": "The recent All-Berland Olympiad in Informatics featured n participants with each scoring a certain amount of points.As the head of the programming committee, you are to determine the set of participants to be awarded with diplomas with respect to the following criteria:   At least one participant should get a diploma.  None of those with score equal to zero should get awarded.  When someone is awarded, all participants with score not less than his score should also be awarded. Determine the number of ways to choose a subset of participants that will receive the diplomas.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of participants. The next line contains a sequence of n integers a1,\u2009a2,\u2009...,\u2009an (0\u2009\u2264\u2009ai\u2009\u2264\u2009600)\u00a0\u2014 participants' scores. It's guaranteed that at least one participant has non-zero score.", "output_spec": "Print a single integer\u00a0\u2014 the desired number of ways.", "sample_inputs": ["4\n1 3 3 2", "3\n1 1 1", "4\n42 0 0 42"], "sample_outputs": ["3", "1", "1"], "notes": "NoteThere are three ways to choose a subset in sample case one.  Only participants with 3 points will get diplomas.  Participants with 2 or 3 points will get diplomas.  Everyone will get a diploma! The only option in sample case two is to award everyone.Note that in sample case three participants with zero scores cannot get anything."}, "src_uid": "3b520c15ea9a11b16129da30dcfb5161"}
{"nl": {"description": "You have a given integer $$$n$$$. Find the number of ways to fill all $$$3 \\times n$$$ tiles with the shape described in the picture below. Upon filling, no empty spaces are allowed. Shapes cannot overlap.  This picture describes when $$$n = 4$$$. The left one is the shape and the right one is $$$3 \\times n$$$ tiles. ", "input_spec": "The only line contains one integer $$$n$$$ ($$$1 \\le n \\le 60$$$)\u00a0\u2014 the length.", "output_spec": "Print the number of ways to fill.", "sample_inputs": ["4", "1"], "sample_outputs": ["4", "0"], "notes": "NoteIn the first example, there are $$$4$$$ possible cases of filling.In the second example, you cannot fill the shapes in $$$3 \\times 1$$$ tiles."}, "src_uid": "4b7ff467ed5907e32fd529fb39b708db"}
{"nl": {"description": "Special Agent Smart Beaver works in a secret research department of ABBYY. He's been working there for a long time and is satisfied with his job, as it allows him to eat out in the best restaurants and order the most expensive and exotic wood types there. The content special agent has got an important task: to get the latest research by British scientists on the English Language. These developments are encoded and stored in a large safe. The Beaver's teeth are strong enough, so the authorities assured that upon arriving at the place the beaver won't have any problems with opening the safe.And he finishes his aspen sprig and leaves for this important task. Of course, the Beaver arrived at the location without any problems, but alas. He can't open the safe with his strong and big teeth. At this point, the Smart Beaver get a call from the headquarters and learns that opening the safe with the teeth is not necessary, as a reliable source has sent the following information: the safe code consists of digits and has no leading zeroes. There also is a special hint, which can be used to open the safe. The hint is string s with the following structure:  if si = \"?\", then the digit that goes i-th in the safe code can be anything (between 0 to 9, inclusively);  if si is a digit (between 0 to 9, inclusively), then it means that there is digit si on position i in code;  if the string contains letters from \"A\" to \"J\", then all positions with the same letters must contain the same digits and the positions with distinct letters must contain distinct digits.  The length of the safe code coincides with the length of the hint. For example, hint \"?JGJ9\" has such matching safe code variants: \"51919\", \"55959\", \"12329\", \"93539\" and so on, and has wrong variants such as: \"56669\", \"00111\", \"03539\" and \"13666\".After receiving such information, the authorities change the plan and ask the special agents to work quietly and gently and not to try to open the safe by mechanical means, and try to find the password using the given hint.At a special agent school the Smart Beaver was the fastest in his platoon finding codes for such safes, but now he is not in that shape: the years take their toll ... Help him to determine the number of possible variants of the code to the safe, matching the given hint. After receiving this information, and knowing his own speed of entering codes, the Smart Beaver will be able to determine whether he will have time for tonight's show \"Beavers are on the trail\" on his favorite TV channel, or he should work for a sleepless night...", "input_spec": "The first line contains string s \u2014 the hint to the safe code. String s consists of the following characters: ?, 0-9, A-J. It is guaranteed that the first character of string s doesn't equal to character 0. The input limits for scoring 30 points are (subproblem A1):    1\u2009\u2264\u2009|s|\u2009\u2264\u20095.  The input limits for scoring 100 points are (subproblems A1+A2):    1\u2009\u2264\u2009|s|\u2009\u2264\u2009105.  Here |s| means the length of string s.", "output_spec": "Print the number of codes that match the given hint.", "sample_inputs": ["AJ", "1?AA"], "sample_outputs": ["81", "100"], "notes": null}, "src_uid": "d3c10d1b1a17ad018359e2dab80d2b82"}
{"nl": {"description": "Everyone loves a freebie. Especially students.It is well-known that if in the night before exam a student opens window, opens the student's record-book and shouts loudly three times \"Fly, freebie, fly!\" \u2014 then flown freebie helps him to pass the upcoming exam.In the night before the exam on mathematical analysis n students living in dormitory shouted treasured words. The i-th student made a sacrament at the time ti, where ti is the number of seconds elapsed since the beginning of the night.It is known that the freebie is a capricious and willful lady. That night the freebie was near dormitory only for T seconds. Therefore, if for two students their sacrament times differ for more than T, then the freebie didn't visit at least one of them.Since all students are optimists, they really want to know what is the maximal number of students visited by the freebie can be.", "input_spec": "The first line of the input contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100), where n \u2014 the number of students shouted \"Fly, freebie, fly!\" The second line contains n positive integers ti (1\u2009\u2264\u2009ti\u2009\u2264\u20091000). The last line contains integer T (1\u2009\u2264\u2009T\u2009\u2264\u20091000) \u2014 the time interval during which the freebie was near the dormitory.", "output_spec": "Print a single integer \u2014 the largest number of people who will pass exam tomorrow because of the freebie visit.", "sample_inputs": ["6\n4 1 7 8 3 8\n1"], "sample_outputs": ["3"], "notes": null}, "src_uid": "086d07bd6f9031df09bd6a6e8fe8f25c"}
{"nl": {"description": "There was once young lass called Mary,  Whose jokes were occasionally scary.  On this April's Fool  Fixed limerick rules  Allowed her to trip the unwary.Can she fill all the linesTo work at all times?On juggling the wordsRight around two-thirdsShe nearly ran out of rhymes.", "input_spec": "The input contains a single integer $$$a$$$ ($$$4 \\le a \\le 998$$$). Not every integer in the range is a valid input for the problem; you are guaranteed that the input will be a valid integer.", "output_spec": "Output a single number.", "sample_inputs": ["35", "57", "391"], "sample_outputs": ["57", "319", "1723"], "notes": null}, "src_uid": "7220f2da5081547a12118595bbeda4f6"}
{"nl": {"description": "Recall that the permutation is an array consisting of $$$n$$$ distinct integers from $$$1$$$ to $$$n$$$ in arbitrary order. For example, $$$[2,3,1,5,4]$$$ is a permutation, but $$$[1,2,2]$$$ is not a permutation ($$$2$$$ appears twice in the array) and $$$[1,3,4]$$$ is also not a permutation ($$$n=3$$$ but there is $$$4$$$ in the array).A sequence $$$a$$$ is a subsegment of a sequence $$$b$$$ if $$$a$$$ can be obtained from $$$b$$$ by deletion of several (possibly, zero or all) elements from the beginning and several (possibly, zero or all) elements from the end. We will denote the subsegments as $$$[l, r]$$$, where $$$l, r$$$ are two integers with $$$1 \\le l \\le r \\le n$$$. This indicates the subsegment where $$$l-1$$$ elements from the beginning and $$$n-r$$$ elements from the end are deleted from the sequence.For a permutation $$$p_1, p_2, \\ldots, p_n$$$, we define a framed segment as a subsegment $$$[l,r]$$$ where $$$\\max\\{p_l, p_{l+1}, \\dots, p_r\\} - \\min\\{p_l, p_{l+1}, \\dots, p_r\\} = r - l$$$. For example, for the permutation $$$(6, 7, 1, 8, 5, 3, 2, 4)$$$ some of its framed segments are: $$$[1, 2], [5, 8], [6, 7], [3, 3], [8, 8]$$$. In particular, a subsegment $$$[i,i]$$$ is always a framed segments for any $$$i$$$ between $$$1$$$ and $$$n$$$, inclusive.We define the happiness of a permutation $$$p$$$ as the number of pairs $$$(l, r)$$$ such that $$$1 \\le l \\le r \\le n$$$, and $$$[l, r]$$$ is a framed segment. For example, the permutation $$$[3, 1, 2]$$$ has happiness $$$5$$$: all segments except $$$[1, 2]$$$ are framed segments.Given integers $$$n$$$ and $$$m$$$, Jongwon wants to compute the sum of happiness for all permutations of length $$$n$$$, modulo the prime number $$$m$$$. Note that there exist $$$n!$$$ (factorial of $$$n$$$) different permutations of length $$$n$$$.", "input_spec": "The only line contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n \\le 250\\,000$$$, $$$10^8 \\le m \\le 10^9$$$, $$$m$$$ is prime).", "output_spec": "Print $$$r$$$ ($$$0 \\le r < m$$$), the sum of happiness for all permutations of length $$$n$$$, modulo a prime number $$$m$$$.", "sample_inputs": ["1 993244853", "2 993244853", "3 993244853", "2019 993244853", "2020 437122297"], "sample_outputs": ["1", "6", "32", "923958830", "265955509"], "notes": "NoteFor sample input $$$n=3$$$, let's consider all permutations of length $$$3$$$:  $$$[1, 2, 3]$$$, all subsegments are framed segment. Happiness is $$$6$$$.  $$$[1, 3, 2]$$$, all subsegments except $$$[1, 2]$$$ are framed segment. Happiness is $$$5$$$.  $$$[2, 1, 3]$$$, all subsegments except $$$[2, 3]$$$ are framed segment. Happiness is $$$5$$$.  $$$[2, 3, 1]$$$, all subsegments except $$$[2, 3]$$$ are framed segment. Happiness is $$$5$$$.  $$$[3, 1, 2]$$$, all subsegments except $$$[1, 2]$$$ are framed segment. Happiness is $$$5$$$.  $$$[3, 2, 1]$$$, all subsegments are framed segment. Happiness is $$$6$$$. Thus, the sum of happiness is $$$6+5+5+5+5+6 = 32$$$."}, "src_uid": "020d5dae7157d937c3f58554c9b155f9"}
{"nl": {"description": "A car moves from point A to point B at speed v meters per second. The action takes place on the X-axis. At the distance d meters from A there are traffic lights. Starting from time 0, for the first g seconds the green light is on, then for the following r seconds the red light is on, then again the green light is on for the g seconds, and so on.The car can be instantly accelerated from 0 to v and vice versa, can instantly slow down from the v to 0. Consider that it passes the traffic lights at the green light instantly. If the car approaches the traffic lights at the moment when the red light has just turned on, it doesn't have time to pass it. But if it approaches the traffic lights at the moment when the green light has just turned on, it can move. The car leaves point A at the time 0.What is the minimum time for the car to get from point A to point B without breaking the traffic rules?", "input_spec": "The first line contains integers l, d, v, g, r (1\u2009\u2264\u2009l,\u2009d,\u2009v,\u2009g,\u2009r\u2009\u2264\u20091000,\u2009d\u2009<\u2009l) \u2014 the distance between A and B (in meters), the distance from A to the traffic lights, car's speed, the duration of green light and the duration of red light.", "output_spec": "Output a single number \u2014 the minimum time that the car needs to get from point A to point B. Your output must have relative or absolute error less than 10\u2009-\u20096.", "sample_inputs": ["2 1 3 4 5", "5 4 3 1 1"], "sample_outputs": ["0.66666667", "2.33333333"], "notes": null}, "src_uid": "e4a4affb439365c843c9f9828d81b42c"}
{"nl": {"description": "Valeric and Valerko missed the last Euro football game, so they decided to watch the game's key moments on the Net. They want to start watching as soon as possible but the connection speed is too low. If they turn on the video right now, it will \"hang up\" as the size of data to watch per second will be more than the size of downloaded data per second.The guys want to watch the whole video without any pauses, so they have to wait some integer number of seconds for a part of the video to download. After this number of seconds passes, they can start watching. Waiting for the whole video to download isn't necessary as the video can download after the guys started to watch.Let's suppose that video's length is c seconds and Valeric and Valerko wait t seconds before the watching. Then for any moment of time t0, t\u2009\u2264\u2009t0\u2009\u2264\u2009c\u2009+\u2009t, the following condition must fulfill: the size of data received in t0 seconds is not less than the size of data needed to watch t0\u2009-\u2009t seconds of the video.Of course, the guys want to wait as little as possible, so your task is to find the minimum integer number of seconds to wait before turning the video on. The guys must watch the video without pauses.", "input_spec": "The first line contains three space-separated integers a, b and c (1\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u20091000,\u2009a\u2009>\u2009b). The first number (a) denotes the size of data needed to watch one second of the video. The second number (b) denotes the size of data Valeric and Valerko can download from the Net per second. The third number (c) denotes the video's length in seconds.", "output_spec": "Print a single number \u2014 the minimum integer number of seconds that Valeric and Valerko must wait to watch football without pauses.", "sample_inputs": ["4 1 1", "10 3 2", "13 12 1"], "sample_outputs": ["3", "5", "1"], "notes": "NoteIn the first sample video's length is 1 second and it is necessary 4 units of data for watching 1 second of video, so guys should download 4 \u00b7 1 = 4 units of data to watch the whole video. The most optimal way is to wait 3 seconds till 3 units of data will be downloaded and then start watching. While guys will be watching video 1 second, one unit of data will be downloaded and Valerik and Valerko will have 4 units of data by the end of watching. Also every moment till the end of video guys will have more data then necessary for watching.In the second sample guys need 2 \u00b7 10 = 20 units of data, so they have to wait 5 seconds and after that they will have 20 units before the second second ends. However, if guys wait 4 seconds, they will be able to watch first second of video without pauses, but they will download 18 units of data by the end of second second and it is less then necessary."}, "src_uid": "7dd098ec3ad5b29ad681787173eba341"}
{"nl": {"description": "You are an intergalactic surgeon and you have an alien patient. For the purposes of this problem, we can and we will model this patient's body using a $$$2 \\times (2k + 1)$$$ rectangular grid. The alien has $$$4k + 1$$$ distinct organs, numbered $$$1$$$ to $$$4k + 1$$$.In healthy such aliens, the organs are arranged in a particular way. For example, here is how the organs of a healthy such alien would be positioned, when viewed from the top, for $$$k = 4$$$:  Here, the E represents empty space. In general, the first row contains organs $$$1$$$ to $$$2k + 1$$$ (in that order from left to right), and the second row contains organs $$$2k + 2$$$ to $$$4k + 1$$$ (in that order from left to right) and then empty space right after. Your patient's organs are complete, and inside their body, but they somehow got shuffled around! Your job, as an intergalactic surgeon, is to put everything back in its correct position. All organs of the alien must be in its body during the entire procedure. This means that at any point during the procedure, there is exactly one cell (in the grid) that is empty. In addition, you can only move organs around by doing one of the following things:  You can switch the positions of the empty space E with any organ to its immediate left or to its immediate right (if they exist). In reality, you do this by sliding the organ in question to the empty space;  You can switch the positions of the empty space E with any organ to its immediate top or its immediate bottom (if they exist) only if the empty space is on the leftmost column, rightmost column or in the centermost column. Again, you do this by sliding the organ in question to the empty space. Your job is to figure out a sequence of moves you must do during the surgical procedure in order to place back all $$$4k + 1$$$ internal organs of your patient in the correct cells. If it is impossible to do so, you must say so.", "input_spec": "The first line of input contains a single integer $$$t$$$ ($$$1 \\le t \\le 4$$$) denoting the number of test cases. The next lines contain descriptions of the test cases. Each test case consists of three lines. The first line contains a single integer $$$k$$$ ($$$1 \\le k \\le 15$$$) which determines the size of the grid. Then two lines follow. Each of them contains $$$2k + 1$$$ space-separated integers or the letter E. They describe the first and second rows of organs, respectively. It is guaranteed that all $$$4k + 1$$$ organs are present and there is exactly one E.", "output_spec": "For each test case, first, print a single line containing either:   SURGERY COMPLETE if it is possible to place back all internal organs in the correct locations;  SURGERY FAILED if it is impossible.  If it is impossible, then this is the only line of output for the test case. However, if it is possible, output a few more lines describing the sequence of moves to place the organs in the correct locations.  The sequence of moves will be a (possibly empty) string of letters u, d, l or r, representing sliding the organ that's directly above, below, to the left or to the right of the empty space, respectively, into the empty space. Print the sequence of moves in the following line, as such a string.  For convenience, you may use shortcuts to reduce the size of your output. You may use uppercase letters as shortcuts for sequences of moves. For example, you could choose T to represent the string lddrr. These shortcuts may also include other shortcuts on their own! For example, you could choose E to represent TruT, etc. You may use any number of uppercase letters (including none) as shortcuts. The only requirements are the following:   The total length of all strings in your output for a single case is at most $$$10^4$$$;  There must be no cycles involving the shortcuts that are reachable from the main sequence;  The resulting sequence of moves is finite, after expanding all shortcuts. Note that the final sequence of moves (after expanding) may be much longer than $$$10^4$$$; the only requirement is that it's finite.  As an example, if T = lddrr, E = TruT and R = rrr, then TurTlER expands to:   TurTlER  lddrrurTlER  lddrrurlddrrlER  lddrrurlddrrlTruTR  lddrrurlddrrllddrrruTR  lddrrurlddrrllddrrrulddrrR  lddrrurlddrrllddrrrulddrrrrr  To use shortcuts, print each one of them in a single line as the uppercase letter, then space, and then the string that this shortcut represents. They may be printed in any order. At the end of all of those, print a single line containing DONE.  Note: You still need to print DONE even if you don't plan on using shortcuts. Your sequence does not need to be the shortest. Any valid sequence of moves (satisfying the requirements above) will be accepted.", "sample_inputs": ["2\n3\n1 2 3 5 6 E 7\n8 9 10 4 11 12 13\n11\n34 45 6 22 16 43 38 44 5 4 41 14 7 29 28 19 9 18 42 8 17 33 1\nE 15 40 36 31 24 10 2 21 11 32 23 30 27 35 25 13 12 39 37 26 20 3"], "sample_outputs": ["SURGERY COMPLETE\nIR\nR SrS\nS rr\nI lldll\nDONE\nSURGERY FAILED"], "notes": "NoteThere are three shortcuts defined in the first sample output:  R = SrS  S = rr  I = lldll The sequence of moves is IR and it expands to:  IR  lldllR  lldllSrS  lldllrrrS  lldllrrrrr "}, "src_uid": "697c4af98ea881892365bed856b49988"}
{"nl": {"description": "There are four stones on an infinite line in integer coordinates $$$a_1, a_2, a_3, a_4$$$. The goal is to have the stones in coordinates $$$b_1, b_2, b_3, b_4$$$. The order of the stones does not matter, that is, a stone from any position $$$a_i$$$ can end up in at any position $$$b_j$$$, provided there is a required number of stones in each position (that is, if a coordinate $$$x$$$ appears $$$k$$$ times among numbers $$$b_1, \\ldots, b_4$$$, there should be exactly $$$k$$$ stones at $$$x$$$ in the end).We are allowed to move stones with the following operation: choose two stones at distinct positions $$$x$$$ and $$$y$$$ with at least one stone each, and move one stone from $$$x$$$ to $$$2y - x$$$. In other words, the operation moves a stone to a symmetric position relative to some other stone. At any moment it is allowed to have any number of stones at the same position.Find any sequence of operations that achieves the goal, or determine that it is impossible. The sequence does not have to be shortest, but it may contain at most $$$1000$$$ operations.", "input_spec": "The first line contains four integers $$$a_1, \\ldots, a_4$$$ ($$$-10^9 \\leq a_i \\leq 10^9$$$)\u00a0\u2014 initial coordinates of the stones. There may be multiple stones sharing the same coordinate. The second line contains four integers $$$b_1, \\ldots, b_4$$$ ($$$-10^9 \\leq b_i \\leq 10^9$$$)\u00a0\u2014 target coordinates of the stones. There may be multiple targets sharing the same coordinate.", "output_spec": "If there is no sequence of operations that achieves the goal, print a single integer $$$-1$$$. Otherwise, on the first line print a single integer $$$k$$$ ($$$0 \\leq k \\leq 1000$$$)\u00a0\u2014 the number of operations in your sequence. On the next $$$k$$$ lines, describe the operations. The $$$i$$$-th of these lines should contain two integers $$$x_i$$$ and $$$y_i$$$ ($$$x_i \\neq y_i$$$)\u00a0\u2014 coordinates of the moved stone and the center of symmetry stone for the $$$i$$$-th operation. For each operation $$$i$$$, there should at least one stone in each of the coordinates $$$x_i$$$ and $$$y_i$$$, and the resulting coordinate $$$2y_i - x_i$$$ must not exceed $$$10^{18}$$$ by absolute value. If there are multiple suitable sequences, print any of them. It is guaranteed that if there is a suitable sequence of operations, then there is also a suitable sequence that satisfies all the additional requirement.", "sample_inputs": ["0 1 2 3\n3 5 6 8", "0 0 0 0\n1 1 1 1", "0 0 0 1\n0 1 0 1"], "sample_outputs": ["3\n1 3\n2 5\n0 3", "-1", "-1"], "notes": null}, "src_uid": "7b6b3d4bc0a269836bc0113bb17f562f"}
{"nl": {"description": "There are $$$b$$$ boys and $$$g$$$ girls participating in Olympiad of Metropolises. There will be a board games tournament in the evening and $$$n$$$ participants have accepted the invitation. The organizers do not know how many boys and girls are among them.Organizers are preparing red badges for girls and blue ones for boys.Vasya prepared $$$n+1$$$ decks of badges. The $$$i$$$-th (where $$$i$$$ is from $$$0$$$ to $$$n$$$, inclusive) deck contains $$$i$$$ blue badges and $$$n-i$$$ red ones. The total number of badges in any deck is exactly $$$n$$$.Determine the minimum number of decks among these $$$n+1$$$ that Vasya should take, so that there will be a suitable deck no matter how many girls and boys there will be among the participants of the tournament.", "input_spec": "The first line contains an integer $$$b$$$ ($$$1 \\le b \\le 300$$$), the number of boys.  The second line contains an integer $$$g$$$ ($$$1 \\le g \\le 300$$$), the number of girls.  The third line contains an integer $$$n$$$ ($$$1 \\le n \\le b + g$$$), the number of the board games tournament participants.", "output_spec": "Output the only integer, the minimum number of badge decks that Vasya could take.", "sample_inputs": ["5\n6\n3", "5\n3\n5"], "sample_outputs": ["4", "4"], "notes": "NoteIn the first example, each of 4 decks should be taken: (0 blue, 3 red), (1 blue, 2 red), (2 blue, 1 red), (3 blue, 0 red).In the second example, 4 decks should be taken: (2 blue, 3 red), (3 blue, 2 red), (4 blue, 1 red), (5 blue, 0 red). Piles (0 blue, 5 red) and (1 blue, 4 red) can not be used."}, "src_uid": "9266a69e767df299569986151852e7b1"}
{"nl": {"description": "Tavak and Seyyed are good friends. Seyyed is very funny and he told Tavak to solve the following problem instead of longest-path.You are given l and r. For all integers from l to r, inclusive, we wrote down all of their integer divisors except 1. Find the integer that we wrote down the maximum number of times.Solve the problem to show that it's not a NP problem.", "input_spec": "The first line contains two integers l and r (2\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009109).", "output_spec": "Print single integer, the integer that appears maximum number of times in the divisors.  If there are multiple answers, print any of them.", "sample_inputs": ["19 29", "3 6"], "sample_outputs": ["2", "3"], "notes": "NoteDefinition of a divisor: https://www.mathsisfun.com/definitions/divisor-of-an-integer-.htmlThe first example: from 19 to 29 these numbers are divisible by 2: {20,\u200922,\u200924,\u200926,\u200928}.The second example: from 3 to 6 these numbers are divisible by 3: {3,\u20096}."}, "src_uid": "a8d992ab26a528f0be327c93fb499c15"}
{"nl": {"description": null, "input_spec": null, "output_spec": null, "sample_inputs": [], "sample_outputs": [], "notes": null}, "src_uid": "b6a30a725754a4b4daeb6e87986e28a4"}
{"nl": {"description": "This problem is split into two tasks. In this task, you are required to find the maximum possible answer. In the task Village (Minimum) you are required to find the minimum possible answer. Each task is worth $$$50$$$ points.There are $$$N$$$ houses in a certain village. A single villager lives in each of the houses. The houses are connected by roads. Each road connects two houses and is exactly $$$1$$$ kilometer long. From each house it is possible to reach any other using one or several consecutive roads. In total there are $$$N-1$$$ roads in the village.One day all villagers decided to move to different houses \u2014 that is, after moving each house should again have a single villager living in it, but no villager should be living in the same house as before. We would like to know the largest possible total length in kilometers of the shortest paths between the old and the new houses for all villagers. Example village with seven houses For example, if there are seven houses connected by roads as shown on the figure, the largest total length is $$$18$$$ km (this can be achieved by moving $$$1 \\to 7$$$, $$$2 \\to 3$$$, $$$3 \\to 4$$$, $$$4 \\to 1$$$, $$$5 \\to 2$$$, $$$6 \\to 5$$$, $$$7 \\to 6$$$).Write a program that finds the largest total length of the shortest paths in kilometers and an example assignment of the new houses to the villagers.", "input_spec": "The first line contains an integer $$$N$$$ ($$$1 < N \\le 10^5$$$). Houses are numbered by consecutive integers $$$1, 2, \\ldots, N$$$. Then $$$N-1$$$ lines follow that describe the roads. Each line contains two integers $$$a$$$ and $$$b$$$ ($$$1 \\le a, b \\le N$$$, $$$a \\neq b$$$) denoting that there is a road connecting houses $$$a$$$ and $$$b$$$.", "output_spec": "In the first line output the largest total length of the shortest paths in kilometers. In the second line describe one valid assignment of the new houses with the largest total length: $$$N$$$ space-separated distinct integers $$$v_1, v_2, \\ldots, v_N$$$. For each $$$i$$$, $$$v_i$$$ is the house number where villager from the house $$$i$$$ should move ($$$v_i \\neq i$$$). If there are several valid assignments, output any of those.", "sample_inputs": ["4\n1 2\n2 3\n3 4", "7\n4 2\n5 7\n3 4\n6 3\n1 3\n4 5"], "sample_outputs": ["8\n4 3 2 1", "18\n2 7 4 1 3 5 6"], "notes": null}, "src_uid": "343dbacbc6bb4981a062dda5a1a13656"}
{"nl": {"description": "Vasya started working in a machine vision company of IT City. Vasya's team creates software and hardware for identification of people by their face.One of the project's know-how is a camera rotating around its optical axis on shooting. People see an eye-catching gadget \u2014 a rotating camera \u2014 come up to it to see it better, look into it. And the camera takes their photo at that time. What could be better for high quality identification?But not everything is so simple. The pictures from camera appear rotated too (on clockwise camera rotation frame the content becomes rotated counter-clockwise). But the identification algorithm can work only with faces that are just slightly deviated from vertical.Vasya was entrusted to correct the situation \u2014 to rotate a captured image so that image would be minimally deviated from vertical. Requirements were severe. Firstly, the picture should be rotated only on angle divisible by 90 degrees to not lose a bit of information about the image. Secondly, the frames from the camera are so huge and FPS is so big that adequate rotation speed is provided by hardware FPGA solution only. And this solution can rotate only by 90 degrees clockwise. Of course, one can apply 90 degrees turn several times but for the sake of performance the number of turns should be minimized.Help Vasya implement the program that by the given rotation angle of the camera can determine the minimum number of 90 degrees clockwise turns necessary to get a picture in which up direction deviation from vertical is minimum.The next figure contains frames taken from an unrotated camera, then from rotated 90 degrees clockwise, then from rotated 90 degrees counter-clockwise. Arrows show direction to \"true up\".  The next figure shows 90 degrees clockwise turn by FPGA hardware.  ", "input_spec": "The only line of the input contains one integer x (\u2009-\u20091018\u2009\u2264\u2009x\u2009\u2264\u20091018) \u2014 camera angle in degrees. Positive value denotes clockwise camera rotation, negative \u2014 counter-clockwise.", "output_spec": "Output one integer \u2014 the minimum required number of 90 degrees clockwise turns.", "sample_inputs": ["60", "-60"], "sample_outputs": ["1", "3"], "notes": "NoteWhen the camera is rotated 60 degrees counter-clockwise (the second example), an image from it is rotated 60 degrees clockwise. One 90 degrees clockwise turn of the image result in 150 degrees clockwise total rotation and deviation from \"true up\" for one turn is 150 degrees. Two 90 degrees clockwise turns of the image result in 240 degrees clockwise total rotation and deviation from \"true up\" for two turns is 120 degrees because 240 degrees clockwise equal to 120 degrees counter-clockwise. Three 90 degrees clockwise turns of the image result in 330 degrees clockwise total rotation and deviation from \"true up\" for three turns is 30 degrees because 330 degrees clockwise equal to 30 degrees counter-clockwise.From 60, 150, 120 and 30 degrees deviations the smallest is 30, and it it achieved in three 90 degrees clockwise turns."}, "src_uid": "509db9cb6156b692557ba874a09f150e"}
{"nl": {"description": "Consider some square matrix A with side n consisting of zeros and ones. There are n rows numbered from 1 to n from top to bottom and n columns numbered from 1 to n from left to right in this matrix. We'll denote the element of the matrix which is located at the intersection of the i-row and the j-th column as Ai,\u2009j.Let's call matrix A clear if no two cells containing ones have a common side.Let's call matrix A symmetrical if it matches the matrices formed from it by a horizontal and/or a vertical reflection. Formally, for each pair (i,\u2009j) (1\u2009\u2264\u2009i,\u2009j\u2009\u2264\u2009n) both of the following conditions must be met: Ai,\u2009j\u2009=\u2009An\u2009-\u2009i\u2009+\u20091,\u2009j and Ai,\u2009j\u2009=\u2009Ai,\u2009n\u2009-\u2009j\u2009+\u20091.Let's define the sharpness of matrix A as the number of ones in it.Given integer x, your task is to find the smallest positive integer n such that there exists a clear symmetrical matrix A with side n and sharpness x.", "input_spec": "The only line contains a single integer x (1\u2009\u2264\u2009x\u2009\u2264\u2009100) \u2014 the required sharpness of the matrix.", "output_spec": "Print a single number \u2014 the sought value of n.", "sample_inputs": ["4", "9"], "sample_outputs": ["3", "5"], "notes": "NoteThe figure below shows the matrices that correspond to the samples:  "}, "src_uid": "01eccb722b09a0474903b7e5abc4c47a"}
{"nl": {"description": "Little girl Alyona is in a shop to buy some copybooks for school. She study four subjects so she wants to have equal number of copybooks for each of the subjects. There are three types of copybook's packs in the shop: it is possible to buy one copybook for a rubles, a pack of two copybooks for b rubles, and a pack of three copybooks for c rubles. Alyona already has n copybooks.What is the minimum amount of rubles she should pay to buy such number of copybooks k that n\u2009+\u2009k is divisible by 4? There are infinitely many packs of any type in the shop. Alyona can buy packs of different type in the same purchase.", "input_spec": "The only line contains 4 integers n, a, b, c (1\u2009\u2264\u2009n,\u2009a,\u2009b,\u2009c\u2009\u2264\u2009109).", "output_spec": "Print the minimum amount of rubles she should pay to buy such number of copybooks k that n\u2009+\u2009k is divisible by 4.", "sample_inputs": ["1 1 3 4", "6 2 1 1", "4 4 4 4", "999999999 1000000000 1000000000 1000000000"], "sample_outputs": ["3", "1", "0", "1000000000"], "notes": "NoteIn the first example Alyona can buy 3 packs of 1 copybook for 3a\u2009=\u20093 rubles in total. After that she will have 4 copybooks which she can split between the subjects equally. In the second example Alyuna can buy a pack of 2 copybooks for b\u2009=\u20091 ruble. She will have 8 copybooks in total.In the third example Alyona can split the copybooks she already has between the 4 subject equally, so she doesn't need to buy anything.In the fourth example Alyona should buy one pack of one copybook."}, "src_uid": "c74537b7e2032c1d928717dfe15ccfb8"}
{"nl": {"description": "Little Lesha loves listening to music via his smartphone. But the smartphone doesn't have much memory, so Lesha listens to his favorite songs in a well-known social network InTalk.Unfortunately, internet is not that fast in the city of Ekaterinozavodsk and the song takes a lot of time to download. But Lesha is quite impatient. The song's duration is T seconds. Lesha downloads the first S seconds of the song and plays it. When the playback reaches the point that has not yet been downloaded, Lesha immediately plays the song from the start (the loaded part of the song stays in his phone, and the download is continued from the same place), and it happens until the song is downloaded completely and Lesha listens to it to the end. For q seconds of real time the Internet allows you to download q\u2009-\u20091 seconds of the track.Tell Lesha, for how many times he will start the song, including the very first start.", "input_spec": "The single line contains three integers T,\u2009S,\u2009q (2\u2009\u2264\u2009q\u2009\u2264\u2009104, 1\u2009\u2264\u2009S\u2009<\u2009T\u2009\u2264\u2009105).", "output_spec": "Print a single integer\u00a0\u2014 the number of times the song will be restarted.", "sample_inputs": ["5 2 2", "5 4 7", "6 2 3"], "sample_outputs": ["2", "1", "1"], "notes": "NoteIn the first test, the song is played twice faster than it is downloaded, which means that during four first seconds Lesha reaches the moment that has not been downloaded, and starts the song again. After another two seconds, the song is downloaded completely, and thus, Lesha starts the song twice.In the second test, the song is almost downloaded, and Lesha will start it only once.In the third sample test the download finishes and Lesha finishes listening at the same moment. Note that song isn't restarted in this case."}, "src_uid": "0d01bf286fb2c7950ce5d5fa59a17dd9"}
{"nl": {"description": "Maksim walks on a Cartesian plane. Initially, he stands at the point $$$(0, 0)$$$ and in one move he can go to any of four adjacent points (left, right, up, down). For example, if Maksim is currently at the point $$$(0, 0)$$$, he can go to any of the following points in one move:   $$$(1, 0)$$$;  $$$(0, 1)$$$;  $$$(-1, 0)$$$;  $$$(0, -1)$$$. There are also $$$n$$$ distinct key points at this plane. The $$$i$$$-th point is $$$p_i = (x_i, y_i)$$$. It is guaranteed that $$$0 \\le x_i$$$ and $$$0 \\le y_i$$$ and there is no key point $$$(0, 0)$$$.Let the first level points be such points that $$$max(x_i, y_i) = 1$$$, the second level points be such points that $$$max(x_i, y_i) = 2$$$ and so on. Maksim wants to visit all the key points. But he shouldn't visit points of level $$$i + 1$$$ if he does not visit all the points of level $$$i$$$. He starts visiting the points from the minimum level of point from the given set.The distance between two points $$$(x_1, y_1)$$$ and $$$(x_2, y_2)$$$ is $$$|x_1 - x_2| + |y_1 - y_2|$$$ where $$$|v|$$$ is the absolute value of $$$v$$$.Maksim wants to visit all the key points in such a way that the total distance he walks will be minimum possible. Your task is to find this distance.If you are Python programmer, consider using PyPy instead of Python when you submit your code.", "input_spec": "The first line of the input contains one integer $$$n$$$ ($$$1 \\le n \\le 2 \\cdot 10^5$$$) \u2014 the number of key points. Each of the next $$$n$$$ lines contains two integers $$$x_i$$$, $$$y_i$$$ ($$$0 \\le x_i, y_i \\le 10^9$$$) \u2014 $$$x$$$-coordinate of the key point $$$p_i$$$ and $$$y$$$-coordinate of the key point $$$p_i$$$. It is guaranteed that all the points are distinct and the point $$$(0, 0)$$$ is not in this set.", "output_spec": "Print one integer \u2014 the minimum possible total distance Maksim has to travel if he needs to visit all key points in a way described above.", "sample_inputs": ["8\n2 2\n1 4\n2 3\n3 1\n3 4\n1 1\n4 3\n1 2", "5\n2 1\n1 0\n2 0\n3 2\n0 3"], "sample_outputs": ["15", "9"], "notes": "NoteThe picture corresponding to the first example: There is one of the possible answers of length $$$15$$$.The picture corresponding to the second example: There is one of the possible answers of length $$$9$$$."}, "src_uid": "06646a9bdce2d65e92e525e97b2c975d"}
{"nl": {"description": "Polycarp and Vasiliy love simple logical games. Today they play a game with infinite chessboard and one pawn for each player. Polycarp and Vasiliy move in turns, Polycarp starts. In each turn Polycarp can move his pawn from cell (x,\u2009y) to (x\u2009-\u20091,\u2009y) or (x,\u2009y\u2009-\u20091). Vasiliy can move his pawn from (x,\u2009y) to one of cells: (x\u2009-\u20091,\u2009y),\u2009(x\u2009-\u20091,\u2009y\u2009-\u20091) and (x,\u2009y\u2009-\u20091). Both players are also allowed to skip move. There are some additional restrictions \u2014 a player is forbidden to move his pawn to a cell with negative x-coordinate or y-coordinate or to the cell containing opponent's pawn The winner is the first person to reach cell (0,\u20090). You are given the starting coordinates of both pawns. Determine who will win if both of them play optimally well.", "input_spec": "The first line contains four integers: xp,\u2009yp,\u2009xv,\u2009yv (0\u2009\u2264\u2009xp,\u2009yp,\u2009xv,\u2009yv\u2009\u2264\u2009105) \u2014 Polycarp's and Vasiliy's starting coordinates. It is guaranteed that in the beginning the pawns are in different cells and none of them is in the cell (0,\u20090).", "output_spec": "Output the name of the winner: \"Polycarp\" or \"Vasiliy\".", "sample_inputs": ["2 1 2 2", "4 7 7 4"], "sample_outputs": ["Polycarp", "Vasiliy"], "notes": "NoteIn the first sample test Polycarp starts in (2,\u20091) and will move to (1,\u20091) in the first turn. No matter what his opponent is doing, in the second turn Polycarp can move to (1,\u20090) and finally to (0,\u20090) in the third turn."}, "src_uid": "2637d57f7809ff8f922549c617709074"}
{"nl": {"description": "Bessie the cow and her best friend Elsie each received a sliding puzzle on Pi Day. Their puzzles consist of a 2\u2009\u00d7\u20092 grid and three tiles labeled 'A', 'B', and 'C'. The three tiles sit on top of the grid, leaving one grid cell empty. To make a move, Bessie or Elsie can slide a tile adjacent to the empty cell into the empty cell as shown below:  In order to determine if they are truly Best Friends For Life (BFFLs), Bessie and Elsie would like to know if there exists a sequence of moves that takes their puzzles to the same configuration (moves can be performed in both puzzles). Two puzzles are considered to be in the same configuration if each tile is on top of the same grid cell in both puzzles. Since the tiles are labeled with letters, rotations and reflections are not allowed.", "input_spec": "The first two lines of the input consist of a 2\u2009\u00d7\u20092 grid describing the initial configuration of Bessie's puzzle. The next two lines contain a 2\u2009\u00d7\u20092 grid describing the initial configuration of Elsie's puzzle. The positions of the tiles are labeled 'A', 'B', and 'C', while the empty cell is labeled 'X'. It's guaranteed that both puzzles contain exactly one tile with each letter and exactly one empty position.", "output_spec": "Output \"YES\"(without quotes) if the puzzles can reach the same configuration (and Bessie and Elsie are truly BFFLs). Otherwise, print \"NO\" (without quotes).", "sample_inputs": ["AB\nXC\nXB\nAC", "AB\nXC\nAC\nBX"], "sample_outputs": ["YES", "NO"], "notes": "NoteThe solution to the first sample is described by the image. All Bessie needs to do is slide her 'A' tile down.In the second sample, the two puzzles can never be in the same configuration. Perhaps Bessie and Elsie are not meant to be friends after all..."}, "src_uid": "46f051f58d626587a5ec449c27407771"}
{"nl": {"description": "Vasya came up with his own weather forecasting method. He knows the information about the average air temperature for each of the last n days. Assume that the average air temperature for each day is integral.Vasya believes that if the average temperatures over the last n days form an arithmetic progression, where the first term equals to the average temperature on the first day, the second term equals to the average temperature on the second day and so on, then the average temperature of the next (n\u2009+\u20091)-th day will be equal to the next term of the arithmetic progression. Otherwise, according to Vasya's method, the temperature of the (n\u2009+\u20091)-th day will be equal to the temperature of the n-th day.Your task is to help Vasya predict the average temperature for tomorrow, i. e. for the (n\u2009+\u20091)-th day.", "input_spec": "The first line contains a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of days for which the average air temperature is known. The second line contains a sequence of integers t1,\u2009t2,\u2009...,\u2009tn (\u2009-\u20091000\u2009\u2264\u2009ti\u2009\u2264\u20091000)\u00a0\u2014 where ti is the average temperature in the i-th day.", "output_spec": "Print the average air temperature in the (n\u2009+\u20091)-th day, which Vasya predicts according to his method. Note that the absolute value of the predicted temperature can exceed 1000.", "sample_inputs": ["5\n10 5 0 -5 -10", "4\n1 1 1 1", "3\n5 1 -5", "2\n900 1000"], "sample_outputs": ["-15", "1", "-5", "1100"], "notes": "NoteIn the first example the sequence of the average temperatures is an arithmetic progression where the first term is 10 and each following terms decreases by 5. So the predicted average temperature for the sixth day is \u2009-\u200910\u2009-\u20095\u2009=\u2009\u2009-\u200915.In the second example the sequence of the average temperatures is an arithmetic progression where the first term is 1 and each following terms equals to the previous one. So the predicted average temperature in the fifth day is 1.In the third example the average temperatures do not form an arithmetic progression, so the average temperature of the fourth day equals to the temperature of the third day and equals to \u2009-\u20095.In the fourth example the sequence of the average temperatures is an arithmetic progression where the first term is 900 and each the following terms increase by 100. So predicted average temperature in the third day is 1000\u2009+\u2009100\u2009=\u20091100."}, "src_uid": "d04fa4322a1b300bdf4a56f09681b17f"}
{"nl": {"description": "Amr bought a new video game \"Guess Your Way Out!\". The goal of the game is to find an exit from the maze that looks like a perfect binary tree of height h. The player is initially standing at the root of the tree and the exit from the tree is located at some leaf node. Let's index all the leaf nodes from the left to the right from 1 to 2h. The exit is located at some node n where 1\u2009\u2264\u2009n\u2009\u2264\u20092h, the player doesn't know where the exit is so he has to guess his way out!Amr follows simple algorithm to choose the path. Let's consider infinite command string \"LRLRLRLRL...\" (consisting of alternating characters 'L' and 'R'). Amr sequentially executes the characters of the string using following rules:  Character 'L' means \"go to the left child of the current node\";  Character 'R' means \"go to the right child of the current node\";  If the destination node is already visited, Amr skips current command, otherwise he moves to the destination node;  If Amr skipped two consecutive commands, he goes back to the parent of the current node before executing next command;  If he reached a leaf node that is not the exit, he returns to the parent of the current node;  If he reaches an exit, the game is finished. Now Amr wonders, if he follows this algorithm, how many nodes he is going to visit before reaching the exit?", "input_spec": "Input consists of two integers h,\u2009n (1\u2009\u2264\u2009h\u2009\u2264\u200950, 1\u2009\u2264\u2009n\u2009\u2264\u20092h).", "output_spec": "Output a single integer representing the number of nodes (excluding the exit node) Amr is going to visit before reaching the exit by following this algorithm.", "sample_inputs": ["1 2", "2 3", "3 6", "10 1024"], "sample_outputs": ["2", "5", "10", "2046"], "notes": "NoteA perfect binary tree of height h is a binary tree consisting of h\u2009+\u20091 levels. Level 0 consists of a single node called root, level h consists of 2h nodes called leaves. Each node that is not a leaf has exactly two children, left and right one. Following picture illustrates the sample test number 3. Nodes are labeled according to the order of visit."}, "src_uid": "3dc25ccb394e2d5ceddc6b3a26cb5781"}
{"nl": {"description": "Polycarp is going to participate in the contest. It starts at $$$h_1:m_1$$$ and ends at $$$h_2:m_2$$$. It is guaranteed that the contest lasts an even number of minutes (i.e. $$$m_1 \\% 2 = m_2 \\% 2$$$, where $$$x \\% y$$$ is $$$x$$$ modulo $$$y$$$). It is also guaranteed that the entire contest is held during a single day. And finally it is guaranteed that the contest lasts at least two minutes.Polycarp wants to know the time of the midpoint of the contest. For example, if the contest lasts from $$$10:00$$$ to $$$11:00$$$ then the answer is $$$10:30$$$, if the contest lasts from $$$11:10$$$ to $$$11:12$$$ then the answer is $$$11:11$$$.", "input_spec": "The first line of the input contains two integers $$$h_1$$$ and $$$m_1$$$ in the format hh:mm. The second line of the input contains two integers $$$h_2$$$ and $$$m_2$$$ in the same format (hh:mm). It is guaranteed that $$$0 \\le h_1, h_2 \\le 23$$$ and $$$0 \\le m_1, m_2 \\le 59$$$. It is guaranteed that the contest lasts an even number of minutes (i.e. $$$m_1 \\% 2 = m_2 \\% 2$$$, where $$$x \\% y$$$ is $$$x$$$ modulo $$$y$$$). It is also guaranteed that the entire contest is held during a single day. And finally it is guaranteed that the contest lasts at least two minutes.", "output_spec": "Print two integers $$$h_3$$$ and $$$m_3$$$ ($$$0 \\le h_3 \\le 23, 0 \\le m_3 \\le 59$$$) corresponding to the midpoint of the contest in the format hh:mm. Print each number as exactly two digits (prepend a number with leading zero if needed), separate them with ':'.", "sample_inputs": ["10:00\n11:00", "11:10\n11:12", "01:02\n03:02"], "sample_outputs": ["10:30", "11:11", "02:02"], "notes": null}, "src_uid": "f7a32a8325ce97c4c50ce3a5c282ec50"}
{"nl": {"description": "Petr has just bought a new car. He's just arrived at the most known Petersburg's petrol station to refuel it when he suddenly discovered that the petrol tank is secured with a combination lock! The lock has a scale of $$$360$$$ degrees and a pointer which initially points at zero:  Petr called his car dealer, who instructed him to rotate the lock's wheel exactly $$$n$$$ times. The $$$i$$$-th rotation should be $$$a_i$$$ degrees, either clockwise or counterclockwise, and after all $$$n$$$ rotations the pointer should again point at zero.This confused Petr a little bit as he isn't sure which rotations should be done clockwise and which should be done counterclockwise. As there are many possible ways of rotating the lock, help him and find out whether there exists at least one, such that after all $$$n$$$ rotations the pointer will point at zero again.", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\leq n \\leq 15$$$) \u2014 the number of rotations. Each of the following $$$n$$$ lines contains one integer $$$a_i$$$ ($$$1 \\leq a_i \\leq 180$$$) \u2014 the angle of the $$$i$$$-th rotation in degrees.", "output_spec": "If it is possible to do all the rotations so that the pointer will point at zero after all of them are performed, print a single word \"YES\". Otherwise, print \"NO\". Petr will probably buy a new car in this case. You can print each letter in any case (upper or lower).", "sample_inputs": ["3\n10\n20\n30", "3\n10\n10\n10", "3\n120\n120\n120"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteIn the first example, we can achieve our goal by applying the first and the second rotation clockwise, and performing the third rotation counterclockwise.In the second example, it's impossible to perform the rotations in order to make the pointer point at zero in the end.In the third example, Petr can do all three rotations clockwise. In this case, the whole wheel will be rotated by $$$360$$$ degrees clockwise and the pointer will point at zero again."}, "src_uid": "01b50fcba4185ceb1eb8e4ba04a0cc10"}
{"nl": {"description": "Bad news came to Mike's village, some thieves stole a bunch of chocolates from the local factory! Horrible! Aside from loving sweet things, thieves from this area are known to be very greedy. So after a thief takes his number of chocolates for himself, the next thief will take exactly k times more than the previous one. The value of k (k\u2009>\u20091) is a secret integer known only to them. It is also known that each thief's bag can carry at most n chocolates (if they intend to take more, the deal is cancelled) and that there were exactly four thieves involved. Sadly, only the thieves know the value of n, but rumours say that the numbers of ways they could have taken the chocolates (for a fixed n, but not fixed k) is m. Two ways are considered different if one of the thieves (they should be numbered in the order they take chocolates) took different number of chocolates in them.Mike want to track the thieves down, so he wants to know what their bags are and value of n will help him in that. Please find the smallest possible value of n or tell him that the rumors are false and there is no such n.", "input_spec": "The single line of input contains the integer m (1\u2009\u2264\u2009m\u2009\u2264\u20091015)\u00a0\u2014 the number of ways the thieves might steal the chocolates, as rumours say.", "output_spec": "Print the only integer n\u00a0\u2014 the maximum amount of chocolates that thieves' bags can carry. If there are more than one n satisfying the rumors, print the smallest one. If there is no such n for a false-rumoured m, print \u2009-\u20091.", "sample_inputs": ["1", "8", "10"], "sample_outputs": ["8", "54", "-1"], "notes": "NoteIn the first sample case the smallest n that leads to exactly one way of stealing chocolates is n\u2009=\u20098, whereas the amounts of stealed chocolates are (1,\u20092,\u20094,\u20098) (the number of chocolates stolen by each of the thieves).In the second sample case the smallest n that leads to exactly 8 ways is n\u2009=\u200954 with the possibilities: (1,\u20092,\u20094,\u20098),\u2009\u2002(1,\u20093,\u20099,\u200927),\u2009\u2002(2,\u20094,\u20098,\u200916),\u2009\u2002(2,\u20096,\u200918,\u200954),\u2009\u2002(3,\u20096,\u200912,\u200924),\u2009\u2002(4,\u20098,\u200916,\u200932),\u2009\u2002(5,\u200910,\u200920,\u200940),\u2009\u2002(6,\u200912,\u200924,\u200948).There is no n leading to exactly 10 ways of stealing chocolates in the third sample case."}, "src_uid": "602deaad5c66e264997249457d555129"}
{"nl": {"description": "Smart Beaver decided to be not only smart, but also a healthy beaver! And so he began to attend physical education classes at school X. In this school, physical education has a very creative teacher. One of his favorite warm-up exercises is throwing balls. Students line up. Each one gets a single ball in the beginning. The balls are numbered from 1 to n (by the demand of the inventory commission).   Figure 1. The initial position for n\u2009=\u20095.  After receiving the balls the students perform the warm-up exercise. The exercise takes place in a few throws. For each throw the teacher chooses any two arbitrary different students who will participate in it. The selected students throw their balls to each other. Thus, after each throw the students remain in their positions, and the two balls are swapped.   Figure 2. The example of a throw.  In this case there was a throw between the students, who were holding the 2-nd and the 4-th balls. Since the warm-up has many exercises, each of them can only continue for little time. Therefore, for each student we know the maximum number of throws he can participate in. For this lessons maximum number of throws will be 1 or 2.Note that after all phases of the considered exercise any ball can end up with any student. Smart Beaver decided to formalize it and introduced the concept of the \"ball order\". The ball order is a sequence of n numbers that correspond to the order of balls in the line. The first number will match the number of the ball of the first from the left student in the line, the second number will match the ball of the second student, and so on. For example, in figure 2 the order of the balls was (1, 2, 3, 4, 5), and after the throw it was (1, 4, 3, 2, 5). Smart beaver knows the number of students and for each student he knows the maximum number of throws in which he can participate. And now he is wondering: what is the number of distinct ways of ball orders by the end of the exercise.", "input_spec": "The first line contains a single number n \u2014 the number of students in the line and the number of balls. The next line contains exactly n space-separated integers. Each number corresponds to a student in the line (the i-th number corresponds to the i-th from the left student in the line) and shows the number of throws he can participate in. The input limits for scoring 30 points are (subproblem D1):    1\u2009\u2264\u2009n\u2009\u2264\u200910.  The input limits for scoring 70 points are (subproblems D1+D2):    1\u2009\u2264\u2009n\u2009\u2264\u2009500.  The input limits for scoring 100 points are (subproblems D1+D2+D3):    1\u2009\u2264\u2009n\u2009\u2264\u20091000000. ", "output_spec": "The output should contain a single integer \u2014 the number of variants of ball orders after the warm up exercise is complete. As the number can be rather large, print it modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["5\n1 2 2 1 2", "8\n1 2 2 1 2 1 1 2"], "sample_outputs": ["120", "16800"], "notes": null}, "src_uid": "91e8dbe94273e255182aca0f94117bb9"}
{"nl": {"description": "Nothing is eternal in the world, Kostya understood it on the 7-th of January when he saw partially dead four-color garland.Now he has a goal to replace dead light bulbs, however he doesn't know how many light bulbs for each color are required. It is guaranteed that for each of four colors at least one light is working.It is known that the garland contains light bulbs of four colors: red, blue, yellow and green. The garland is made as follows: if you take any four consecutive light bulbs then there will not be light bulbs with the same color among them. For example, the garland can look like \"RYBGRYBGRY\", \"YBGRYBGRYBG\", \"BGRYB\", but can not look like \"BGRYG\", \"YBGRYBYGR\" or \"BGYBGY\". Letters denote colors: 'R'\u00a0\u2014 red, 'B'\u00a0\u2014 blue, 'Y'\u00a0\u2014 yellow, 'G'\u00a0\u2014 green.Using the information that for each color at least one light bulb still works count the number of dead light bulbs of each four colors.", "input_spec": "The first and the only line contains the string s (4\u2009\u2264\u2009|s|\u2009\u2264\u2009100), which describes the garland, the i-th symbol of which describes the color of the i-th light bulb in the order from the beginning of garland:    'R'\u00a0\u2014 the light bulb is red,  'B'\u00a0\u2014 the light bulb is blue,  'Y'\u00a0\u2014 the light bulb is yellow,  'G'\u00a0\u2014 the light bulb is green,  '!'\u00a0\u2014 the light bulb is dead.  The string s can not contain other symbols except those five which were described.  It is guaranteed that in the given string at least once there is each of four letters 'R', 'B', 'Y' and 'G'.  It is guaranteed that the string s is correct garland with some blown light bulbs, it means that for example the line \"GRBY!!!B\" can not be in the input data. ", "output_spec": "In the only line print four integers kr,\u2009kb,\u2009ky,\u2009kg\u00a0\u2014 the number of dead light bulbs of red, blue, yellow and green colors accordingly.", "sample_inputs": ["RYBGRYBGR", "!RGYB", "!!!!YGRB", "!GB!RG!Y!"], "sample_outputs": ["0 0 0 0", "0 1 0 0", "1 1 1 1", "2 1 1 0"], "notes": "NoteIn the first example there are no dead light bulbs.In the second example it is obvious that one blue bulb is blown, because it could not be light bulbs of other colors on its place according to the statements."}, "src_uid": "64fc6e9b458a9ece8ad70a8c72126b33"}
{"nl": {"description": "Iahub isn't well prepared on geometry problems, but he heard that this year there will be a lot of geometry problems on the IOI selection camp. Scared, Iahub locked himself in the basement and started thinking of new problems of this kind. One of them is the following.Iahub wants to draw n distinct points and m segments on the OX axis. He can draw each point with either red or blue. The drawing is good if and only if the following requirement is met: for each segment [li,\u2009ri] consider all the red points belong to it (ri points), and all the blue points belong to it (bi points); each segment i should satisfy the inequality |ri\u2009-\u2009bi|\u2009\u2264\u20091.Iahub thinks that point x belongs to segment [l,\u2009r], if inequality l\u2009\u2264\u2009x\u2009\u2264\u2009r holds.Iahub gives to you all coordinates of points and segments. Please, help him to find any good drawing.", "input_spec": "The first line of input contains two integers: n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) and m (1\u2009\u2264\u2009m\u2009\u2264\u2009100). The next line contains n space-separated integers x1,\u2009x2,\u2009...,\u2009xn (0\u2009\u2264\u2009xi\u2009\u2264\u2009100) \u2014 the coordinates of the points. The following m lines contain the descriptions of the m segments. Each line contains two integers li and ri (0\u2009\u2264\u2009li\u2009\u2264\u2009ri\u2009\u2264\u2009100) \u2014 the borders of the i-th segment. It's guaranteed that all the points are distinct.", "output_spec": "If there is no good drawing for a given test, output a single integer -1. Otherwise output n integers, each integer must be 0 or 1. The i-th number denotes the color of the i-th point (0 is red, and 1 is blue). If there are multiple good drawings you can output any of them.", "sample_inputs": ["3 3\n3 7 14\n1 5\n6 10\n11 15", "3 4\n1 2 3\n1 2\n2 3\n5 6\n2 2"], "sample_outputs": ["0 0 0", "1 0 1"], "notes": null}, "src_uid": "692698d4b49ad446984f3a7a631f961d"}
{"nl": {"description": "A few years ago Sajjad left his school and register to another one due to security reasons. Now he wishes to find Amir, one of his schoolmates and good friends.There are n schools numerated from 1 to n. One can travel between each pair of them, to do so, he needs to buy a ticket. The ticker between schools i and j costs  and can be used multiple times. Help Sajjad to find the minimum cost he needs to pay for tickets to visit all schools. He can start and finish in any school.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009105)\u00a0\u2014 the number of schools.", "output_spec": "Print single integer: the minimum cost of tickets needed to visit all schools.", "sample_inputs": ["2", "10"], "sample_outputs": ["0", "4"], "notes": "NoteIn the first example we can buy a ticket between the schools that costs ."}, "src_uid": "dfe9446431325c73e88b58ba204d0e47"}
{"nl": {"description": "Top-model Izabella participates in the competition. She wants to impress judges and show her mathematical skills.Her problem is following: for given string, consisting of only 0 and 1, tell if it's possible to remove some digits in such a way, that remaining number is a representation of some positive integer, divisible by 64, in the binary numerical system.", "input_spec": "In the only line given a non-empty binary string s with length up to 100.", "output_spec": "Print \u00abyes\u00bb (without quotes) if it's possible to remove digits required way and \u00abno\u00bb otherwise.", "sample_inputs": ["100010001", "100"], "sample_outputs": ["yes", "no"], "notes": "NoteIn the first test case, you can get string 1 000 000 after removing two ones which is a representation of number 64 in the binary numerical system.You can read more about binary numeral system representation here: https://en.wikipedia.org/wiki/Binary_system"}, "src_uid": "88364b8d71f2ce2b90bdfaa729eb92ca"}
{"nl": {"description": "Your friend has recently learned about coprime numbers. A pair of numbers {a,\u2009b} is called coprime if the maximum number that divides both a and b is equal to one. Your friend often comes up with different statements. He has recently supposed that if the pair (a,\u2009b) is coprime and the pair (b,\u2009c) is coprime, then the pair (a,\u2009c) is coprime. You want to find a counterexample for your friend's statement. Therefore, your task is to find three distinct numbers (a,\u2009b,\u2009c), for which the statement is false, and the numbers meet the condition l\u2009\u2264\u2009a\u2009<\u2009b\u2009<\u2009c\u2009\u2264\u2009r. More specifically, you need to find three numbers (a,\u2009b,\u2009c), such that l\u2009\u2264\u2009a\u2009<\u2009b\u2009<\u2009c\u2009\u2264\u2009r, pairs (a,\u2009b) and (b,\u2009c) are coprime, and pair (a,\u2009c) is not coprime.", "input_spec": "The single line contains two positive space-separated integers l, r (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u20091018; r\u2009-\u2009l\u2009\u2264\u200950).", "output_spec": "Print three positive space-separated integers a, b, c\u00a0\u2014 three distinct numbers (a,\u2009b,\u2009c) that form the counterexample. If there are several solutions, you are allowed to print any of them. The numbers must be printed in ascending order.  If the counterexample does not exist, print the single number -1.", "sample_inputs": ["2 4", "10 11", "900000000000000009 900000000000000029"], "sample_outputs": ["2 3 4", "-1", "900000000000000009 900000000000000010 900000000000000021"], "notes": "NoteIn the first sample pair (2,\u20094) is not coprime and pairs (2,\u20093) and (3,\u20094) are. In the second sample you cannot form a group of three distinct integers, so the answer is -1. In the third sample it is easy to see that numbers 900000000000000009 and 900000000000000021 are divisible by three. "}, "src_uid": "6c1ad1cc1fbecff69be37b1709a5236d"}
{"nl": {"description": "Katie, Kuro and Shiro are best friends. They have known each other since kindergarten. That's why they often share everything with each other and work together on some very hard problems.Today is Shiro's birthday. She really loves pizza so she wants to invite her friends to the pizza restaurant near her house to celebrate her birthday, including her best friends Katie and Kuro.She has ordered a very big round pizza, in order to serve her many friends. Exactly $$$n$$$ of Shiro's friends are here. That's why she has to divide the pizza into $$$n + 1$$$ slices (Shiro also needs to eat). She wants the slices to be exactly the same size and shape. If not, some of her friends will get mad and go home early, and the party will be over.Shiro is now hungry. She wants to cut the pizza with minimum of straight cuts. A cut is a straight segment, it might have ends inside or outside the pizza. But she is too lazy to pick up the calculator.As usual, she will ask Katie and Kuro for help. But they haven't come yet. Could you help Shiro with this problem?", "input_spec": "A single line contains one non-negative integer $$$n$$$ ($$$0 \\le n \\leq 10^{18}$$$)\u00a0\u2014 the number of Shiro's friends. The circular pizza has to be sliced into $$$n + 1$$$ pieces.", "output_spec": "A single integer\u00a0\u2014 the number of straight cuts Shiro needs.", "sample_inputs": ["3", "4"], "sample_outputs": ["2", "5"], "notes": "NoteTo cut the round pizza into quarters one has to make two cuts through the center with angle $$$90^{\\circ}$$$ between them.To cut the round pizza into five equal parts one has to make five cuts."}, "src_uid": "236177ff30dafe68295b5d33dc501828"}
{"nl": {"description": "JATC and his friend Giraffe are currently in their room, solving some problems. Giraffe has written on the board an array $$$a_1$$$, $$$a_2$$$, ..., $$$a_n$$$ of integers, such that $$$1 \\le a_1 < a_2 < \\ldots < a_n \\le 10^3$$$, and then went to the bathroom.JATC decided to prank his friend by erasing some consecutive elements in the array. Since he doesn't want for the prank to go too far, he will only erase in a way, such that Giraffe can still restore the array using the information from the remaining elements. Because Giraffe has created the array, he's also aware that it's an increasing array and all the elements are integers in the range $$$[1, 10^3]$$$.JATC wonders what is the greatest number of elements he can erase?", "input_spec": "The first line of the input contains a single integer $$$n$$$ ($$$1 \\le n \\le 100$$$)\u00a0\u2014 the number of elements in the array. The second line of the input contains $$$n$$$ integers $$$a_i$$$ ($$$1 \\le a_1<a_2<\\dots<a_n \\le 10^3$$$)\u00a0\u2014 the array written by Giraffe.", "output_spec": "Print a single integer\u00a0\u2014 the maximum number of consecutive elements in the array that JATC can erase. If it is impossible to erase even a single element, print $$$0$$$.", "sample_inputs": ["6\n1 3 4 5 6 9", "3\n998 999 1000", "5\n1 2 3 4 5"], "sample_outputs": ["2", "2", "4"], "notes": "NoteIn the first example, JATC can erase the third and fourth elements, leaving the array $$$[1, 3, \\_, \\_, 6, 9]$$$. As you can see, there is only one way to fill in the blanks.In the second example, JATC can erase the second and the third elements. The array will become $$$[998, \\_, \\_]$$$. Because all the elements are less than or equal to $$$1000$$$, the array is still can be restored. Note, that he can't erase the first $$$2$$$ elements.In the third example, JATC can erase the first $$$4$$$ elements. Since all the elements are greater than or equal to $$$1$$$, Giraffe can still restore the array. Note, that he can't erase the last $$$4$$$ elements."}, "src_uid": "858b5e75e21c4cba6d08f3f66be0c198"}
{"nl": {"description": "One day Vasya was sitting on a not so interesting Maths lesson and making an origami from a rectangular a mm \u2009\u00d7\u2009 b mm sheet of paper (a\u2009>\u2009b). Usually the first step in making an origami is making a square piece of paper from the rectangular sheet by folding the sheet along the bisector of the right angle, and cutting the excess part.  After making a paper ship from the square piece, Vasya looked on the remaining (a\u2009-\u2009b) mm \u2009\u00d7\u2009 b mm strip of paper. He got the idea to use this strip of paper in the same way to make an origami, and then use the remainder (if it exists) and so on. At the moment when he is left with a square piece of paper, he will make the last ship from it and stop.Can you determine how many ships Vasya will make during the lesson?", "input_spec": "The first line of the input contains two integers a, b (1\u2009\u2264\u2009b\u2009<\u2009a\u2009\u2264\u20091012) \u2014 the sizes of the original sheet of paper.", "output_spec": "Print a single integer \u2014 the number of ships that Vasya will make.", "sample_inputs": ["2 1", "10 7", "1000000000000 1"], "sample_outputs": ["2", "6", "1000000000000"], "notes": "NotePictures to the first and second sample test.  "}, "src_uid": "ce698a0eb3f5b82de58feb177ce43b83"}
{"nl": {"description": "The end of the school year is near and Ms. Manana, the teacher, will soon have to say goodbye to a yet another class. She decided to prepare a goodbye present for her n students and give each of them a jigsaw puzzle (which, as wikipedia states, is a tiling puzzle that requires the assembly of numerous small, often oddly shaped, interlocking and tessellating pieces).The shop assistant told the teacher that there are m puzzles in the shop, but they might differ in difficulty and size. Specifically, the first jigsaw puzzle consists of f1 pieces, the second one consists of f2 pieces and so on.Ms. Manana doesn't want to upset the children, so she decided that the difference between the numbers of pieces in her presents must be as small as possible. Let A be the number of pieces in the largest puzzle that the teacher buys and B be the number of pieces in the smallest such puzzle. She wants to choose such n puzzles that A\u2009-\u2009B is minimum possible. Help the teacher and find the least possible value of A\u2009-\u2009B.", "input_spec": "The first line contains space-separated integers n and m (2\u2009\u2264\u2009n\u2009\u2264\u2009m\u2009\u2264\u200950). The second line contains m space-separated integers f1,\u2009f2,\u2009...,\u2009fm (4\u2009\u2264\u2009fi\u2009\u2264\u20091000) \u2014 the quantities of pieces in the puzzles sold in the shop.", "output_spec": "Print a single integer \u2014 the least possible difference the teacher can obtain.", "sample_inputs": ["4 6\n10 12 10 7 5 22"], "sample_outputs": ["5"], "notes": "NoteSample 1. The class has 4 students. The shop sells 6 puzzles. If Ms. Manana buys the first four puzzles consisting of 10, 12, 10 and 7 pieces correspondingly, then the difference between the sizes of the largest and the smallest puzzle will be equal to 5. It is impossible to obtain a smaller difference. Note that the teacher can also buy puzzles 1, 3, 4 and 5 to obtain the difference 5."}, "src_uid": "7830aabb0663e645d54004063746e47f"}
{"nl": {"description": "Recently Vasya found a golden ticket \u2014 a sequence which consists of $$$n$$$ digits $$$a_1a_2\\dots a_n$$$. Vasya considers a ticket to be lucky if it can be divided into two or more non-intersecting segments with equal sums. For example, ticket $$$350178$$$ is lucky since it can be divided into three segments $$$350$$$, $$$17$$$ and $$$8$$$: $$$3+5+0=1+7=8$$$. Note that each digit of sequence should belong to exactly one segment.Help Vasya! Tell him if the golden ticket he found is lucky or not.", "input_spec": "The first line contains one integer $$$n$$$ ($$$2 \\le n \\le 100$$$) \u2014 the number of digits in the ticket. The second line contains $$$n$$$ digits $$$a_1 a_2 \\dots a_n$$$ ($$$0 \\le a_i \\le 9$$$) \u2014 the golden ticket. Digits are printed without spaces.", "output_spec": "If the golden ticket is lucky then print \"YES\", otherwise print \"NO\" (both case insensitive).", "sample_inputs": ["5\n73452", "4\n1248"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example the ticket can be divided into $$$7$$$, $$$34$$$ and $$$52$$$: $$$7=3+4=5+2$$$.In the second example it is impossible to divide ticket into segments with equal sum."}, "src_uid": "410296a01b97a0a39b6683569c84d56c"}
{"nl": {"description": "Dreamoon wants to climb up a stair of n steps. He can climb 1 or 2 steps at each move. Dreamoon wants the number of moves to be a multiple of an integer m. What is the minimal number of moves making him climb to the top of the stairs that satisfies his condition?", "input_spec": "The single line contains two space separated integers n, m (0\u2009<\u2009n\u2009\u2264\u200910000,\u20091\u2009<\u2009m\u2009\u2264\u200910).", "output_spec": "Print a single integer \u2014 the minimal number of moves being a multiple of m. If there is no way he can climb satisfying condition print \u2009-\u20091 instead.", "sample_inputs": ["10 2", "3 5"], "sample_outputs": ["6", "-1"], "notes": "NoteFor the first sample, Dreamoon could climb in 6 moves with following sequence of steps: {2, 2, 2, 2, 1, 1}.For the second sample, there are only three valid sequence of steps {2, 1}, {1, 2}, {1, 1, 1} with 2, 2, and 3 steps respectively. All these numbers are not multiples of 5."}, "src_uid": "0fa526ebc0b4fa3a5866c7c5b3a4656f"}
{"nl": {"description": "An n\u2009\u00d7\u2009n table a is defined as follows:  The first row and the first column contain ones, that is: ai,\u20091\u2009=\u2009a1,\u2009i\u2009=\u20091 for all i\u2009=\u20091,\u20092,\u2009...,\u2009n.  Each of the remaining numbers in the table is equal to the sum of the number above it and the number to the left of it. In other words, the remaining elements are defined by the formula ai,\u2009j\u2009=\u2009ai\u2009-\u20091,\u2009j\u2009+\u2009ai,\u2009j\u2009-\u20091. These conditions define all the values in the table.You are given a number n. You need to determine the maximum value in the n\u2009\u00d7\u2009n table defined by the rules above.", "input_spec": "The only line of input contains a positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u200910) \u2014 the number of rows and columns of the table.", "output_spec": "Print a single line containing a positive integer m \u2014 the maximum value in the table.", "sample_inputs": ["1", "5"], "sample_outputs": ["1", "70"], "notes": "NoteIn the second test the rows of the table look as follows: {1,\u20091,\u20091,\u20091,\u20091},\u2009 {1,\u20092,\u20093,\u20094,\u20095},\u2009 {1,\u20093,\u20096,\u200910,\u200915},\u2009 {1,\u20094,\u200910,\u200920,\u200935},\u2009 {1,\u20095,\u200915,\u200935,\u200970}."}, "src_uid": "2f650aae9dfeb02533149ced402b60dc"}
{"nl": {"description": "Ania has a large integer $$$S$$$. Its decimal representation has length $$$n$$$ and doesn't contain any leading zeroes. Ania is allowed to change at most $$$k$$$ digits of $$$S$$$. She wants to do it in such a way that $$$S$$$ still won't contain any leading zeroes and it'll be minimal possible. What integer will Ania finish with?", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\leq n \\leq 200\\,000$$$, $$$0 \\leq k \\leq n$$$) \u2014 the number of digits in the decimal representation of $$$S$$$ and the maximum allowed number of changed digits. The second line contains the integer $$$S$$$. It's guaranteed that $$$S$$$ has exactly $$$n$$$ digits and doesn't contain any leading zeroes.", "output_spec": "Output the minimal possible value of $$$S$$$ which Ania can end with. Note that the resulting integer should also have $$$n$$$ digits.", "sample_inputs": ["5 3\n51528", "3 2\n102", "1 1\n1"], "sample_outputs": ["10028", "100", "0"], "notes": "NoteA number has leading zeroes if it consists of at least two digits and its first digit is $$$0$$$. For example, numbers $$$00$$$, $$$00069$$$ and $$$0101$$$ have leading zeroes, while $$$0$$$, $$$3000$$$ and $$$1010$$$ don't have leading zeroes."}, "src_uid": "0515ac888937a4dda30cad5e2383164f"}
{"nl": {"description": "There are n people, sitting in a line at the table. For each person we know that he always tells either the truth or lies.Little Serge asked them: how many of you always tell the truth? Each of the people at the table knows everything (who is an honest person and who is a liar) about all the people at the table. The honest people are going to say the correct answer, the liars are going to say any integer from 1 to n, which is not the correct answer. Every liar chooses his answer, regardless of the other liars, so two distinct liars may give distinct answer.Serge does not know any information about the people besides their answers to his question. He took a piece of paper and wrote n integers a1,\u2009a2,\u2009...,\u2009an, where ai is the answer of the i-th person in the row. Given this sequence, Serge determined that exactly k people sitting at the table apparently lie.Serge wonders, how many variants of people's answers (sequences of answers a of length n) there are where one can say that exactly k people sitting at the table apparently lie. As there can be rather many described variants of answers, count the remainder of dividing the number of the variants by 777777777.", "input_spec": "The first line contains two integers n, k, (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u200928). It is guaranteed that n \u2014 is the power of number 2.", "output_spec": "Print a single integer \u2014 the answer to the problem modulo 777777777.", "sample_inputs": ["1 1", "2 1"], "sample_outputs": ["0", "2"], "notes": null}, "src_uid": "cfe19131644e5925e32084a581e23286"}
{"nl": {"description": "Mike is trying rock climbing but he is awful at it. There are n holds on the wall, i-th hold is at height ai off the ground. Besides, let the sequence ai increase, that is, ai\u2009<\u2009ai\u2009+\u20091 for all i from 1 to n\u2009-\u20091; we will call such sequence a track. Mike thinks that the track a1, ..., an has difficulty . In other words, difficulty equals the maximum distance between two holds that are adjacent in height.Today Mike decided to cover the track with holds hanging on heights a1, ..., an. To make the problem harder, Mike decided to remove one hold, that is, remove one element of the sequence (for example, if we take the sequence (1,\u20092,\u20093,\u20094,\u20095) and remove the third element from it, we obtain the sequence (1,\u20092,\u20094,\u20095)). However, as Mike is awful at climbing, he wants the final difficulty (i.e. the maximum difference of heights between adjacent holds after removing the hold) to be as small as possible among all possible options of removing a hold. The first and last holds must stay at their positions.Help Mike determine the minimum difficulty of the track after removing one hold.", "input_spec": "The first line contains a single integer n (3\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of holds. The next line contains n space-separated integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u20091000), where ai is the height where the hold number i hangs. The sequence ai is increasing (i.e. each element except for the first one is strictly larger than the previous one).", "output_spec": "Print a single number \u2014 the minimum difficulty of the track after removing a single hold.", "sample_inputs": ["3\n1 4 6", "5\n1 2 3 4 5", "5\n1 2 3 7 8"], "sample_outputs": ["5", "2", "4"], "notes": "NoteIn the first sample you can remove only the second hold, then the sequence looks like (1,\u20096), the maximum difference of the neighboring elements equals 5.In the second test after removing every hold the difficulty equals 2.In the third test you can obtain sequences (1,\u20093,\u20097,\u20098), (1,\u20092,\u20097,\u20098), (1,\u20092,\u20093,\u20098), for which the difficulty is 4, 5 and 5, respectively. Thus, after removing the second element we obtain the optimal answer \u2014 4."}, "src_uid": "8a8013f960814040ac4bf229a0bd5437"}
{"nl": {"description": "The only difference between easy and hard versions is the length of the string.You are given a string $$$s$$$ and a string $$$t$$$, both consisting only of lowercase Latin letters. It is guaranteed that $$$t$$$ can be obtained from $$$s$$$ by removing some (possibly, zero) number of characters (not necessary contiguous) from $$$s$$$ without changing order of remaining characters (in other words, it is guaranteed that $$$t$$$ is a subsequence of $$$s$$$).For example, the strings \"test\", \"tst\", \"tt\", \"et\" and \"\" are subsequences of the string \"test\". But the strings \"tset\", \"se\", \"contest\" are not subsequences of the string \"test\".You want to remove some substring (contiguous subsequence) from $$$s$$$ of maximum possible length such that after removing this substring $$$t$$$ will remain a subsequence of $$$s$$$.If you want to remove the substring $$$s[l;r]$$$ then the string $$$s$$$ will be transformed to $$$s_1 s_2 \\dots s_{l-1} s_{r+1} s_{r+2} \\dots s_{|s|-1} s_{|s|}$$$ (where $$$|s|$$$ is the length of $$$s$$$).Your task is to find the maximum possible length of the substring you can remove so that $$$t$$$ is still a subsequence of $$$s$$$.", "input_spec": "The first line of the input contains one string $$$s$$$ consisting of at least $$$1$$$ and at most $$$200$$$ lowercase Latin letters. The second line of the input contains one string $$$t$$$ consisting of at least $$$1$$$ and at most $$$200$$$ lowercase Latin letters. It is guaranteed that $$$t$$$ is a subsequence of $$$s$$$.", "output_spec": "Print one integer \u2014 the maximum possible length of the substring you can remove so that $$$t$$$ is still a subsequence of $$$s$$$.", "sample_inputs": ["bbaba\nbb", "baaba\nab", "abcde\nabcde", "asdfasdf\nfasd"], "sample_outputs": ["3", "2", "0", "3"], "notes": null}, "src_uid": "0fd33e1bdfd6c91feb3bf00a2461603f"}
{"nl": {"description": "As you may know, MemSQL has American offices in both San Francisco and Seattle. Being a manager in the company, you travel a lot between the two cities, always by plane.You prefer flying from Seattle to San Francisco than in the other direction, because it's warmer in San Francisco. You are so busy that you don't remember the number of flights you have made in either direction. However, for each of the last n days you know whether you were in San Francisco office or in Seattle office. You always fly at nights, so you never were at both offices on the same day. Given this information, determine if you flew more times from Seattle to San Francisco during the last n days, or not.", "input_spec": "The first line of input contains single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of days. The second line contains a string of length n consisting of only capital 'S' and 'F' letters. If the i-th letter is 'S', then you were in Seattle office on that day. Otherwise you were in San Francisco. The days are given in chronological order, i.e. today is the last day in this sequence.", "output_spec": "Print \"YES\" if you flew more times from Seattle to San Francisco, and \"NO\" otherwise. You can print each letter in any case (upper or lower).", "sample_inputs": ["4\nFSSF", "2\nSF", "10\nFFFFFFFFFF", "10\nSSFFSFFSFF"], "sample_outputs": ["NO", "YES", "NO", "YES"], "notes": "NoteIn the first example you were initially at San Francisco, then flew to Seattle, were there for two days and returned to San Francisco. You made one flight in each direction, so the answer is \"NO\".In the second example you just flew from Seattle to San Francisco, so the answer is \"YES\".In the third example you stayed the whole period in San Francisco, so the answer is \"NO\".In the fourth example if you replace 'S' with ones, and 'F' with zeros, you'll get the first few digits of \u03c0 in binary representation. Not very useful information though."}, "src_uid": "ab8a2070ea758d118b3c09ee165d9517"}
{"nl": {"description": "Vitaly is a diligent student who never missed a lesson in his five years of studying in the university. He always does his homework on time and passes his exams in time. During the last lesson the teacher has provided two strings s and t to Vitaly. The strings have the same length, they consist of lowercase English letters, string s is lexicographically smaller than string t. Vitaly wondered if there is such string that is lexicographically larger than string s and at the same is lexicographically smaller than string t. This string should also consist of lowercase English letters and have the length equal to the lengths of strings s and t. Let's help Vitaly solve this easy problem!", "input_spec": "The first line contains string s (1\u2009\u2264\u2009|s|\u2009\u2264\u2009100), consisting of lowercase English letters. Here, |s| denotes the length of the string. The second line contains string t (|t|\u2009=\u2009|s|), consisting of lowercase English letters. It is guaranteed that the lengths of strings s and t are the same and string s is lexicographically less than string t.", "output_spec": "If the string that meets the given requirements doesn't exist, print a single string \"No such string\" (without the quotes). If such string exists, print it. If there are multiple valid strings, you may print any of them.", "sample_inputs": ["a\nc", "aaa\nzzz", "abcdefg\nabcdefh"], "sample_outputs": ["b", "kkk", "No such string"], "notes": "NoteString s\u2009=\u2009s1s2... sn is said to be lexicographically smaller than t\u2009=\u2009t1t2... tn, if there exists such i, that s1\u2009=\u2009t1,\u2009s2\u2009=\u2009t2,\u2009... si\u2009-\u20091\u2009=\u2009ti\u2009-\u20091,\u2009si\u2009<\u2009ti."}, "src_uid": "47618510d2a17b1cc1e6a688201d51a3"}
{"nl": {"description": "Let's consider equation:x2\u2009+\u2009s(x)\u00b7x\u2009-\u2009n\u2009=\u20090,\u2009 where x,\u2009n are positive integers, s(x) is the function, equal to the sum of digits of number x in the decimal number system.You are given an integer n, find the smallest positive integer root of equation x, or else determine that there are no such roots.", "input_spec": "A single line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091018) \u2014 the equation parameter. Please, do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specifier. ", "output_spec": "Print -1, if the equation doesn't have integer positive roots. Otherwise print such smallest integer x (x\u2009>\u20090), that the equation given in the statement holds.", "sample_inputs": ["2", "110", "4"], "sample_outputs": ["1", "10", "-1"], "notes": "NoteIn the first test case x\u2009=\u20091 is the minimum root. As s(1)\u2009=\u20091 and 12\u2009+\u20091\u00b71\u2009-\u20092\u2009=\u20090.In the second test case x\u2009=\u200910 is the minimum root. As s(10)\u2009=\u20091\u2009+\u20090\u2009=\u20091 and 102\u2009+\u20091\u00b710\u2009-\u2009110\u2009=\u20090.In the third test case the equation has no roots."}, "src_uid": "e1070ad4383f27399d31b8d0e87def59"}
{"nl": {"description": "Have you ever played Hanabi? If not, then you've got to try it out! This problem deals with a simplified version of the game.Overall, the game has 25 types of cards (5 distinct colors and 5 distinct values). Borya is holding n cards. The game is somewhat complicated by the fact that everybody sees Borya's cards except for Borya himself. Borya knows which cards he has but he knows nothing about the order they lie in. Note that Borya can have multiple identical cards (and for each of the 25 types of cards he knows exactly how many cards of this type he has).The aim of the other players is to achieve the state when Borya knows the color and number value of each of his cards. For that, other players can give him hints. The hints can be of two types: color hints and value hints. A color hint goes like that: a player names some color and points at all the cards of this color. Similarly goes the value hint. A player names some value and points at all the cards that contain the value.Determine what minimum number of hints the other players should make for Borya to be certain about each card's color and value.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of Borya's cards. The next line contains the descriptions of n cards. The description of each card consists of exactly two characters. The first character shows the color (overall this position can contain five distinct letters \u2014 R, G, B, Y, W). The second character shows the card's value (a digit from 1 to 5). Borya doesn't know exact order of the cards they lie in.", "output_spec": "Print a single integer \u2014 the minimum number of hints that the other players should make.", "sample_inputs": ["2\nG3 G3", "4\nG4 R4 R3 B3", "5\nB1 Y1 W1 G1 R1"], "sample_outputs": ["0", "2", "4"], "notes": "NoteIn the first sample Borya already knows for each card that it is a green three.In the second sample we can show all fours and all red cards.In the third sample you need to make hints about any four colors."}, "src_uid": "3b12863997b377b47bae43566ec1a63b"}
{"nl": {"description": "Andrey received a postcard from Irina. It contained only the words \"Hello, Andrey!\", and a strange string consisting of lowercase Latin letters, snowflakes and candy canes. Andrey thought that this string is an encrypted message, and decided to decrypt it.Andrey noticed that snowflakes and candy canes always stand after the letters, so he supposed that the message was encrypted as follows. Candy cane means that the letter before it can be removed, or can be left. A snowflake means that the letter before it can be removed, left, or repeated several times.For example, consider the following string:   This string can encode the message \u00abhappynewyear\u00bb. For this, candy canes and snowflakes should be used as follows:   candy cane 1: remove the letter w,  snowflake 1: repeat the letter p twice,  candy cane 2: leave the letter n,  snowflake 2: remove the letter w,  snowflake 3: leave the letter e.   Please note that the same string can encode different messages. For example, the string above can encode \u00abhayewyar\u00bb, \u00abhapppppynewwwwwyear\u00bb, and other messages.Andrey knows that messages from Irina usually have a length of $$$k$$$ letters. Help him to find out if a given string can encode a message of $$$k$$$ letters, and if so, give an example of such a message.", "input_spec": "The first line contains the string received in the postcard. The string consists only of lowercase Latin letters, as well as the characters \u00ab*\u00bb and \u00ab?\u00bb, meaning snowflake and candy cone, respectively. These characters can only appear immediately after the letter. The length of the string does not exceed $$$200$$$. The second line contains an integer number $$$k$$$ ($$$1 \\leq k \\leq 200$$$), the required message length.", "output_spec": "Print any message of length $$$k$$$ that the given string can encode, or \u00abImpossible\u00bb if such a message does not exist.", "sample_inputs": ["hw?ap*yn?eww*ye*ar\n12", "ab?a\n2", "ab?a\n3", "ababb\n5", "ab?a\n1"], "sample_outputs": ["happynewyear", "aa", "aba", "ababb", "Impossible"], "notes": null}, "src_uid": "90ad5e6bb5839f9b99a125ccb118a276"}
{"nl": {"description": "\u041f\u0430\u043c\u044f\u0442\u044c \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0430 \u0441\u043e\u0441\u0442\u043e\u0438\u0442 \u0438\u0437 n \u044f\u0447\u0435\u0435\u043a, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u0441\u0442\u0440\u043e\u0435\u043d\u044b \u0432 \u0440\u044f\u0434. \u041f\u0440\u043e\u043d\u0443\u043c\u0435\u0440\u0443\u0435\u043c \u044f\u0447\u0435\u0439\u043a\u0438 \u043e\u0442 1 \u0434\u043e n \u0441\u043b\u0435\u0432\u0430 \u043d\u0430\u043f\u0440\u0430\u0432\u043e. \u041f\u0440\u043e \u043a\u0430\u0436\u0434\u0443\u044e \u044f\u0447\u0435\u0439\u043a\u0443 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e, \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u0430 \u043e\u043d\u0430 \u0438\u043b\u0438 \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0438\u0442 \u043a\u0430\u043a\u043e\u043c\u0443-\u043b\u0438\u0431\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443 (\u0432 \u0442\u0430\u043a\u043e\u043c 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\u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c\u0441\u044f.\u0421\u0447\u0438\u0442\u0430\u0439\u0442\u0435, \u0447\u0442\u043e \u043d\u043e\u043c\u0435\u0440\u0430 \u0432\u0441\u0435\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b, \u0445\u043e\u0442\u044f \u0431\u044b \u043e\u0434\u043d\u0430 \u044f\u0447\u0435\u0439\u043a\u0430 \u043f\u0430\u043c\u044f\u0442\u0438 \u0437\u0430\u043d\u044f\u0442\u0430 \u043a\u0430\u043a\u0438\u043c-\u043b\u0438\u0431\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u043c.", "input_spec": "\u0412 \u043f\u0435\u0440\u0432\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u0447\u0438\u0441\u043b\u043e n (1\u2009\u2264\u2009n\u2009\u2264\u2009200\u2009000)\u00a0\u2014 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e 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\u043f\u0440\u043e\u043d\u0443\u043c\u0435\u0440\u043e\u0432\u0430\u043d\u044b \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u043c\u0438 \u0447\u0438\u0441\u043b\u0430\u043c\u0438.", "output_spec": "\u0412\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u043e\u0434\u043d\u043e \u0446\u0435\u043b\u043e\u0435 \u0447\u0438\u0441\u043b\u043e\u00a0\u2014 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043d\u0443\u0436\u043d\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0434\u043b\u044f \u0434\u0435\u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u0438 \u043f\u0430\u043c\u044f\u0442\u0438.", "sample_inputs": ["4\n0 2 2 1", "8\n0 8 8 8 0 4 4 2"], "sample_outputs": ["2", "4"], "notes": "\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435\u0412 \u043f\u0435\u0440\u0432\u043e\u043c \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0434\u0432\u0443\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439:  \u041f\u0435\u0440\u0435\u043f\u0438\u0441\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0438\u0437 \u0442\u0440\u0435\u0442\u044c\u0435\u0439 \u044f\u0447\u0435\u0439\u043a\u0438 \u0432 \u043f\u0435\u0440\u0432\u0443\u044e. \u041f\u043e\u0441\u043b\u0435 \u044d\u0442\u043e\u0433\u043e \u043f\u0430\u043c\u044f\u0442\u044c \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0430 \u043f\u0440\u0438\u043c\u0435\u0442 \u0432\u0438\u0434: 2\u00a02\u00a00\u00a01.  \u041f\u0435\u0440\u0435\u043f\u0438\u0441\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0438\u0437 \u0447\u0435\u0442\u0432\u0435\u0440\u0442\u043e\u0439 \u044f\u0447\u0435\u0439\u043a\u0438 \u0432 \u0442\u0440\u0435\u0442\u044c\u044e. \u041f\u043e\u0441\u043b\u0435 \u044d\u0442\u043e\u0433\u043e \u043f\u0430\u043c\u044f\u0442\u044c \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0430 \u043f\u0440\u0438\u043c\u0435\u0442 \u0432\u0438\u0434: 2\u00a02\u00a01\u00a00.  "}, "src_uid": "9135c7243431debb049f640e9600bc6e"}
{"nl": {"description": "The year 2015 is almost over.Limak is a little polar bear. He has recently learnt about the binary system. He noticed that the passing year has exactly one zero in its representation in the binary system\u00a0\u2014 201510\u2009=\u2009111110111112. Note that he doesn't care about the number of zeros in the decimal representation.Limak chose some interval of years. He is going to count all years from this interval that have exactly one zero in the binary representation. Can you do it faster?Assume that all positive integers are always written without leading zeros.", "input_spec": "The only line of the input contains two integers a and b (1\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u20091018)\u00a0\u2014 the first year and the last year in Limak's interval respectively.", "output_spec": "Print one integer\u00a0\u2013 the number of years Limak will count in his chosen interval.", "sample_inputs": ["5 10", "2015 2015", "100 105", "72057594000000000 72057595000000000"], "sample_outputs": ["2", "1", "0", "26"], "notes": "NoteIn the first sample Limak's interval contains numbers 510\u2009=\u20091012, 610\u2009=\u20091102, 710\u2009=\u20091112, 810\u2009=\u200910002, 910\u2009=\u200910012 and 1010\u2009=\u200910102. Two of them (1012 and 1102) have the described property."}, "src_uid": "581f61b1f50313bf4c75833cefd4d022"}
{"nl": {"description": "Luba thinks about watering her garden. The garden can be represented as a segment of length k. Luba has got n buckets, the i-th bucket allows her to water some continuous subsegment of garden of length exactly ai each hour. Luba can't water any parts of the garden that were already watered, also she can't water the ground outside the garden.Luba has to choose one of the buckets in order to water the garden as fast as possible (as mentioned above, each hour she will water some continuous subsegment of length ai if she chooses the i-th bucket). Help her to determine the minimum number of hours she has to spend watering the garden. It is guaranteed that Luba can always choose a bucket so it is possible water the garden.See the examples for better understanding.", "input_spec": "The first line of input contains two integer numbers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u2009100) \u2014 the number of buckets and the length of the garden, respectively. The second line of input contains n integer numbers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 the length of the segment that can be watered by the i-th bucket in one hour. It is guaranteed that there is at least one bucket such that it is possible to water the garden in integer number of hours using only this bucket.", "output_spec": "Print one integer number \u2014 the minimum number of hours required to water the garden.", "sample_inputs": ["3 6\n2 3 5", "6 7\n1 2 3 4 5 6"], "sample_outputs": ["2", "7"], "notes": "NoteIn the first test the best option is to choose the bucket that allows to water the segment of length 3. We can't choose the bucket that allows to water the segment of length 5 because then we can't water the whole garden.In the second test we can choose only the bucket that allows us to water the segment of length 1."}, "src_uid": "80520be9916045aca3a7de7bc925af1f"}
{"nl": {"description": "Devu is a renowned classical singer. He is invited to many big functions/festivals. Recently he was invited to \"All World Classical Singing Festival\". Other than Devu, comedian Churu was also invited.Devu has provided organizers a list of the songs and required time for singing them. He will sing n songs, ith song will take ti minutes exactly. The Comedian, Churu will crack jokes. All his jokes are of 5 minutes exactly.People have mainly come to listen Devu. But you know that he needs rest of 10 minutes after each song. On the other hand, Churu being a very active person, doesn't need any rest.You as one of the organizers should make an optimal s\u0441hedule for the event. For some reasons you must follow the conditions:  The duration of the event must be no more than d minutes;  Devu must complete all his songs;  With satisfying the two previous conditions the number of jokes cracked by Churu should be as many as possible. If it is not possible to find a way to conduct all the songs of the Devu, output -1. Otherwise find out maximum number of jokes that Churu can crack in the grand event.", "input_spec": "The first line contains two space separated integers n, d (1\u2009\u2264\u2009n\u2009\u2264\u2009100;\u00a01\u2009\u2264\u2009d\u2009\u2264\u200910000). The second line contains n space-separated integers: t1,\u2009t2,\u2009...,\u2009tn (1\u2009\u2264\u2009ti\u2009\u2264\u2009100).", "output_spec": "If there is no way to conduct all the songs of Devu, output -1. Otherwise output the maximum number of jokes that Churu can crack in the grand event.", "sample_inputs": ["3 30\n2 2 1", "3 20\n2 1 1"], "sample_outputs": ["5", "-1"], "notes": "NoteConsider the first example. The duration of the event is 30 minutes. There could be maximum 5 jokes in the following way:  First Churu cracks a joke in 5 minutes.  Then Devu performs the first song for 2 minutes.  Then Churu cracks 2 jokes in 10 minutes.  Now Devu performs second song for 2 minutes.  Then Churu cracks 2 jokes in 10 minutes.  Now finally Devu will perform his last song in 1 minutes.  Total time spent is 5\u2009+\u20092\u2009+\u200910\u2009+\u20092\u2009+\u200910\u2009+\u20091\u2009=\u200930 minutes.Consider the second example. There is no way of organizing Devu's all songs. Hence the answer is -1. "}, "src_uid": "b16f5f5c4eeed2a3700506003e8ea8ea"}
{"nl": {"description": "\u0412 \u0411\u0435\u0440\u043b\u044f\u043d\u0434\u0441\u043a\u043e\u043c \u0433\u043e\u0441\u0443\u0434\u0430\u0440\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u043c \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0435 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u0430\u044f \u0441\u0435\u0442\u044c \u043c\u0435\u0436\u0434\u0443 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 \u043d\u0435 \u0432\u0441\u0435\u0433\u0434\u0430 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0431\u0435\u0437 \u043e\u0448\u0438\u0431\u043e\u043a. \u041f\u0440\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435 \u0434\u0432\u0443\u0445 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u043f\u043e\u0434\u0440\u044f\u0434 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u043e\u0448\u0438\u0431\u043a\u0430, \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 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\u0414\u043b\u0438\u043d\u0430 \u0441\u043e\u0432\u043c\u0435\u0449\u0435\u043d\u0438\u044f \u0434\u043e\u043b\u0436\u043d\u0430 \u0431\u044b\u0442\u044c \u043f\u043e\u043b\u043e\u0436\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0447\u0438\u0441\u043b\u043e\u043c, \u043c\u0435\u043d\u044c\u0448\u0438\u043c \u0434\u043b\u0438\u043d\u044b \u0442\u0435\u043a\u0441\u0442\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435 \u0434\u0432\u0443\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u00ababrakadabra\u00bb \u043f\u043e\u0434\u0440\u044f\u0434 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e, \u0447\u0442\u043e \u043e\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u043f\u0435\u0440\u0435\u0434\u0430\u043d\u043e \u0441 \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u043e\u0433\u043e \u0432\u0438\u0434\u0430, \u0438 \u0442\u043e\u0433\u0434\u0430 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u0432\u0438\u0434\u0430 \u00ababrakadabrabrakadabra\u00bb \u0438\u043b\u0438 \u00ababrakadabrakadabra\u00bb (\u0432 \u043f\u0435\u0440\u0432\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0441\u043e\u0432\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u043e\u0448\u043b\u043e \u043f\u043e \u043e\u0434\u043d\u043e\u043c\u0443 \u0441\u0438\u043c\u0432\u043e\u043b\u0443, \u0430 \u0432\u043e \u0432\u0442\u043e\u0440\u043e\u043c \u2014 \u043f\u043e \u0447\u0435\u0442\u044b\u0440\u0435\u043c).\u041f\u043e \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043d\u043e\u043c\u0443 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044e t \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u043b\u0438, \u0447\u0442\u043e \u044d\u0442\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043e\u0448\u0438\u0431\u043a\u0438 \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u043e\u0433\u043e \u0432\u0438\u0434\u0430 \u0440\u0430\u0431\u043e\u0442\u044b \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438, \u0438 \u0435\u0441\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e, \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 s. \u041d\u0435 \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0441\u0447\u0438\u0442\u0430\u0442\u044c \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044e \u043f\u043e\u043b\u043d\u043e\u0433\u043e \u043d\u0430\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0434\u0440\u0443\u0433\u0430 \u043d\u0430 \u0434\u0440\u0443\u0433\u0430 \u0434\u0432\u0443\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439. \u041a \u043f\u0440\u0438\u043c\u0435\u0440\u0443, \u0435\u0441\u043b\u0438 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u00ababcd\u00bb, \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0441\u0447\u0438\u0442\u0430\u0442\u044c, \u0447\u0442\u043e \u0432 \u043d\u0451\u043c \u043e\u0448\u0438\u0431\u043a\u0438 \u043d\u0435\u0442. \u0410\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u043e, \u043f\u0440\u043e\u0441\u0442\u043e\u0435 \u0434\u043e\u043f\u0438\u0441\u044b\u0432\u0430\u043d\u0438\u0435 \u043e\u0434\u043d\u043e\u0433\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0432\u0441\u043b\u0435\u0434 \u0437\u0430 \u0434\u0440\u0443\u0433\u0438\u043c \u043d\u0435 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u0438\u0437\u043d\u0430\u043a\u043e\u043c \u043e\u0448\u0438\u0431\u043a\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0435\u0441\u043b\u0438 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u00ababcabc\u00bb, \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0441\u0447\u0438\u0442\u0430\u0442\u044c, \u0447\u0442\u043e \u0432 \u043d\u0451\u043c \u043e\u0448\u0438\u0431\u043a\u0438 \u043d\u0435\u0442.", "input_spec": "\u0412 \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u044b\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u043d\u0435\u043f\u0443\u0441\u0442\u0430\u044f \u0441\u0442\u0440\u043e\u043a\u0430 t, \u0441\u043e\u0441\u0442\u043e\u044f\u0449\u0430\u044f \u0438\u0437 \u0441\u0442\u0440\u043e\u0447\u043d\u044b\u0445 \u0431\u0443\u043a\u0432 \u043b\u0430\u0442\u0438\u043d\u0441\u043a\u043e\u0433\u043e \u0430\u043b\u0444\u0430\u0432\u0438\u0442\u0430. \u0414\u043b\u0438\u043d\u0430 \u0441\u0442\u0440\u043e\u043a\u0438 t \u043d\u0435 \u043f\u0440\u0435\u0432\u043e\u0441\u0445\u043e\u0434\u0438\u0442 100 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432.", "output_spec": "\u0415\u0441\u043b\u0438 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 t \u043d\u0435 \u043c\u043e\u0436\u0435\u0442 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0442\u044c \u043e\u0448\u0438\u0431\u043a\u0438, \u0432\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u00abNO\u00bb (\u0431\u0435\u0437 \u043a\u0430\u0432\u044b\u0447\u0435\u043a) \u0432 \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u0443\u044e \u0441\u0442\u0440\u043e\u043a\u0443 \u0432\u044b\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445. \u0412 \u043f\u0440\u043e\u0442\u0438\u0432\u043d\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0432 \u043f\u0435\u0440\u0432\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u00abYES\u00bb (\u0431\u0435\u0437 \u043a\u0430\u0432\u044b\u0447\u0435\u043a), \u0430 \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u0441\u0442\u0440\u043e\u043a\u0443 s\u00a0\u2014 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043c\u043e\u0433\u043b\u043e \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043e\u0448\u0438\u0431\u043a\u0435. \u0415\u0441\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0445 \u043e\u0442\u0432\u0435\u0442\u043e\u0432 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e, \u0440\u0430\u0437\u0440\u0435\u0448\u0430\u0435\u0442\u0441\u044f \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u043b\u044e\u0431\u043e\u0439 \u0438\u0437 \u043d\u0438\u0445.", "sample_inputs": ["abrakadabrabrakadabra", "acacacaca", "abcabc", "abababab", "tatbt"], "sample_outputs": ["YES\nabrakadabra", "YES\nacaca", "NO", "YES\nababab", "NO"], "notes": "\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435\u0412\u043e \u0432\u0442\u043e\u0440\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0449\u0438\u043c \u043e\u0442\u0432\u0435\u0442\u043e\u043c \u0442\u0430\u043a\u0436\u0435 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u0442\u0440\u043e\u043a\u0430 acacaca. "}, "src_uid": "bfa78f72af4875f670f7adc5ed127033"}
{"nl": {"description": "Vasily the Bear loves beautiful strings. String s is beautiful if it meets the following criteria:   String s only consists of characters 0 and 1, at that character 0 must occur in string s exactly n times, and character 1 must occur exactly m times.  We can obtain character g from string s with some (possibly, zero) number of modifications. The character g equals either zero or one. A modification of string with length at least two is the following operation: we replace two last characters from the string by exactly one other character. This character equals one if it replaces two zeros, otherwise it equals zero. For example, one modification transforms string \"01010\" into string \"0100\", two modifications transform it to \"011\". It is forbidden to modify a string with length less than two.Help the Bear, count the number of beautiful strings. As the number of beautiful strings can be rather large, print the remainder after dividing the number by 1000000007 (109\u2009+\u20097). ", "input_spec": "The first line of the input contains three space-separated integers n,\u2009m,\u2009g (0\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009105,\u2009n\u2009+\u2009m\u2009\u2265\u20091,\u20090\u2009\u2264\u2009g\u2009\u2264\u20091).", "output_spec": "Print a single integer \u2014 the answer to the problem modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["1 1 0", "2 2 0", "1 1 1"], "sample_outputs": ["2", "4", "0"], "notes": "NoteIn the first sample the beautiful strings are: \"01\", \"10\".In the second sample the beautiful strings are: \"0011\", \"1001\", \"1010\", \"1100\".In the third sample there are no beautiful strings."}, "src_uid": "066dd9e6091238edf2912a6af4d29e7f"}
{"nl": {"description": "There are $$$n$$$ benches in the Berland Central park. It is known that $$$a_i$$$ people are currently sitting on the $$$i$$$-th bench. Another $$$m$$$ people are coming to the park and each of them is going to have a seat on some bench out of $$$n$$$ available.Let $$$k$$$ be the maximum number of people sitting on one bench after additional $$$m$$$ people came to the park. Calculate the minimum possible $$$k$$$ and the maximum possible $$$k$$$.Nobody leaves the taken seat during the whole process.", "input_spec": "The first line contains a single integer $$$n$$$ $$$(1 \\le n \\le 100)$$$ \u2014 the number of benches in the park. The second line contains a single integer $$$m$$$ $$$(1 \\le m \\le 10\\,000)$$$ \u2014 the number of people additionally coming to the park. Each of the next $$$n$$$ lines contains a single integer $$$a_i$$$ $$$(1 \\le a_i \\le 100)$$$ \u2014 the initial number of people on the $$$i$$$-th bench.", "output_spec": "Print the minimum possible $$$k$$$ and the maximum possible $$$k$$$, where $$$k$$$ is the maximum number of people sitting on one bench after additional $$$m$$$ people came to the park.", "sample_inputs": ["4\n6\n1\n1\n1\n1", "1\n10\n5", "3\n6\n1\n6\n5", "3\n7\n1\n6\n5"], "sample_outputs": ["3 7", "15 15", "6 12", "7 13"], "notes": "NoteIn the first example, each of four benches is occupied by a single person. The minimum $$$k$$$ is $$$3$$$. For example, it is possible to achieve if two newcomers occupy the first bench, one occupies the second bench, one occupies the third bench, and two remaining \u2014 the fourth bench. The maximum $$$k$$$ is $$$7$$$. That requires all six new people to occupy the same bench.The second example has its minimum $$$k$$$ equal to $$$15$$$ and maximum $$$k$$$ equal to $$$15$$$, as there is just a single bench in the park and all $$$10$$$ people will occupy it."}, "src_uid": "78f696bd954c9f0f9bb502e515d85a8d"}
{"nl": {"description": "Noora is a student of one famous high school. It's her final year in school\u00a0\u2014 she is going to study in university next year. However, she has to get an \u00abA\u00bb graduation certificate in order to apply to a prestigious one.In school, where Noora is studying, teachers are putting down marks to the online class register, which are integers from 1 to k. The worst mark is 1, the best is k. Mark that is going to the certificate, is calculated as an average of all the marks, rounded to the closest integer. If several answers are possible, rounding up is produced. For example, 7.3 is rounded to 7, but 7.5 and 7.8784\u00a0\u2014 to 8. For instance, if Noora has marks [8,\u20099], then the mark to the certificate is 9, because the average is equal to 8.5 and rounded to 9, but if the marks are [8,\u20098,\u20099], Noora will have graduation certificate with 8.To graduate with \u00abA\u00bb certificate, Noora has to have mark k.Noora got n marks in register this year. However, she is afraid that her marks are not enough to get final mark k. Noora decided to ask for help in the internet, where hacker Leha immediately responded to her request. He is ready to hack class register for Noora and to add Noora any number of additional marks from 1 to k. At the same time, Leha want his hack be unseen to everyone, so he decided to add as less as possible additional marks. Please help Leha to calculate the minimal number of marks he has to add, so that final Noora's mark will become equal to k.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u2009100,\u20091\u2009\u2264\u2009k\u2009\u2264\u2009100) denoting the number of marks, received by Noora and the value of highest possible mark. The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009k) denoting marks received by Noora before Leha's hack.", "output_spec": "Print a single integer\u00a0\u2014 minimal number of additional marks, that Leha has to add in order to change Noora's final mark to k.", "sample_inputs": ["2 10\n8 9", "3 5\n4 4 4"], "sample_outputs": ["4", "3"], "notes": "NoteConsider the first example testcase.Maximal mark is 10, Noora received two marks\u00a0\u2014 8 and 9, so current final mark is 9. To fix it, Leha can add marks [10,\u200910,\u200910,\u200910] (4 marks in total) to the registry, achieving Noora having average mark equal to . Consequently, new final mark is 10. Less number of marks won't fix the situation.In the second example Leha can add [5,\u20095,\u20095] to the registry, so that making average mark equal to 4.5, which is enough to have 5 in the certificate."}, "src_uid": "f22267bf3fad0bf342ecf4c27ad3a900"}
{"nl": {"description": "Apart from Nian, there is a daemon named Sui, which terrifies children and causes them to become sick. Parents give their children money wrapped in red packets and put them under the pillow, so that when Sui tries to approach them, it will be driven away by the fairies inside.Big Banban is hesitating over the amount of money to give out. He considers loops to be lucky since it symbolizes unity and harmony.He would like to find a positive integer n not greater than 1018, such that there are exactly k loops in the decimal representation of n, or determine that such n does not exist.A loop is a planar area enclosed by lines in the digits' decimal representation written in Arabic numerals. For example, there is one loop in digit 4, two loops in 8 and no loops in 5. Refer to the figure below for all exact forms.  ", "input_spec": "The first and only line contains an integer k (1\u2009\u2264\u2009k\u2009\u2264\u2009106)\u00a0\u2014 the desired number of loops.", "output_spec": "Output an integer\u00a0\u2014 if no such n exists, output -1; otherwise output any such n. In the latter case, your output should be a positive decimal integer not exceeding 1018.", "sample_inputs": ["2", "6"], "sample_outputs": ["462", "8080"], "notes": null}, "src_uid": "0c9973792c1976c5710f88e3520cda4e"}
{"nl": {"description": "Pasha has many hamsters and he makes them work out. Today, n hamsters (n is even) came to work out. The hamsters lined up and each hamster either sat down or stood up.For another exercise, Pasha needs exactly  hamsters to stand up and the other hamsters to sit down. In one minute, Pasha can make some hamster ether sit down or stand up. How many minutes will he need to get what he wants if he acts optimally well?", "input_spec": "The first line contains integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009200; n is even). The next line contains n characters without spaces. These characters describe the hamsters' position: the i-th character equals 'X', if the i-th hamster in the row is standing, and 'x', if he is sitting.", "output_spec": "In the first line, print a single integer \u2014 the minimum required number of minutes. In the second line, print a string that describes the hamsters' position after Pasha makes the required changes. If there are multiple optimal positions, print any of them.", "sample_inputs": ["4\nxxXx", "2\nXX", "6\nxXXxXx"], "sample_outputs": ["1\nXxXx", "1\nxX", "0\nxXXxXx"], "notes": null}, "src_uid": "fa6311c72d90d8363d97854b903f849d"}
{"nl": {"description": "\"QAQ\" is a word to denote an expression of crying. Imagine \"Q\" as eyes with tears and \"A\" as a mouth.Now Diamond has given Bort a string consisting of only uppercase English letters of length n. There is a great number of \"QAQ\" in the string (Diamond is so cute!).  illustration by \u732b\u5c4b https://twitter.com/nekoyaliu Bort wants to know how many subsequences \"QAQ\" are in the string Diamond has given. Note that the letters \"QAQ\" don't have to be consecutive, but the order of letters should be exact.", "input_spec": "The only line contains a string of length n (1\u2009\u2264\u2009n\u2009\u2264\u2009100). It's guaranteed that the string only contains uppercase English letters.", "output_spec": "Print a single integer\u00a0\u2014 the number of subsequences \"QAQ\" in the string.", "sample_inputs": ["QAQAQYSYIOIWIN", "QAQQQZZYNOIWIN"], "sample_outputs": ["4", "3"], "notes": "NoteIn the first example there are 4 subsequences \"QAQ\": \"QAQAQYSYIOIWIN\", \"QAQAQYSYIOIWIN\", \"QAQAQYSYIOIWIN\", \"QAQAQYSYIOIWIN\"."}, "src_uid": "8aef4947322438664bd8610632fe0947"}
{"nl": {"description": "A new airplane SuperPuperJet has an infinite number of rows, numbered with positive integers starting with 1 from cockpit to tail. There are six seats in each row, denoted with letters from 'a' to 'f'. Seats 'a', 'b' and 'c' are located to the left of an aisle (if one looks in the direction of the cockpit), while seats 'd', 'e' and 'f' are located to the right. Seats 'a' and 'f' are located near the windows, while seats 'c' and 'd' are located near the aisle.   \u00a0It's lunch time and two flight attendants have just started to serve food. They move from the first rows to the tail, always maintaining a distance of two rows from each other because of the food trolley. Thus, at the beginning the first attendant serves row 1 while the second attendant serves row 3. When both rows are done they move one row forward: the first attendant serves row 2 while the second attendant serves row 4. Then they move three rows forward and the first attendant serves row 5 while the second attendant serves row 7. Then they move one row forward again and so on.Flight attendants work with the same speed: it takes exactly 1 second to serve one passenger and 1 second to move one row forward. Each attendant first serves the passengers on the seats to the right of the aisle and then serves passengers on the seats to the left of the aisle (if one looks in the direction of the cockpit). Moreover, they always serve passengers in order from the window to the aisle. Thus, the first passenger to receive food in each row is located in seat 'f', and the last one\u00a0\u2014 in seat 'c'. Assume that all seats are occupied.Vasya has seat s in row n and wants to know how many seconds will pass before he gets his lunch.", "input_spec": "The only line of input contains a description of Vasya's seat in the format ns, where n (1\u2009\u2264\u2009n\u2009\u2264\u20091018) is the index of the row and s is the seat in this row, denoted as letter from 'a' to 'f'. The index of the row and the seat are not separated by a space.", "output_spec": "Print one integer\u00a0\u2014 the number of seconds Vasya has to wait until he gets his lunch.", "sample_inputs": ["1f", "2d", "4a", "5e"], "sample_outputs": ["1", "10", "11", "18"], "notes": "NoteIn the first sample, the first flight attendant serves Vasya first, so Vasya gets his lunch after 1 second.In the second sample, the flight attendants will spend 6 seconds to serve everyone in the rows 1 and 3, then they will move one row forward in 1 second. As they first serve seats located to the right of the aisle in order from window to aisle, Vasya has to wait 3 more seconds. The total is 6\u2009+\u20091\u2009+\u20093\u2009=\u200910."}, "src_uid": "069d0cb9b7c798a81007fb5b63fa0f45"}
{"nl": {"description": "  ", "input_spec": "The input contains two integers a,\u2009b (1\u2009\u2264\u2009a\u2009\u2264\u200910,\u20090\u2009\u2264\u2009b\u2009\u2264\u200922\u00b7a\u2009-\u20091) separated by a single space.", "output_spec": "Output two integers separated by a single space.", "sample_inputs": ["1 0", "2 15", "4 160"], "sample_outputs": ["0 0", "3 0", "12 12"], "notes": null}, "src_uid": "879ac20ae5d3e7f1002afe907d9887df"}
{"nl": {"description": "Mary has just graduated from one well-known University and is now attending celebration party. Students like to dream of a beautiful life, so they used champagne glasses to construct a small pyramid. The height of the pyramid is n. The top level consists of only 1 glass, that stands on 2 glasses on the second level (counting from the top), then 3 glasses on the third level and so on.The bottom level consists of n glasses.Vlad has seen in the movies many times how the champagne beautifully flows from top levels to bottom ones, filling all the glasses simultaneously. So he took a bottle and started to pour it in the glass located at the top of the pyramid.Each second, Vlad pours to the top glass the amount of champagne equal to the size of exactly one glass. If the glass is already full, but there is some champagne flowing in it, then it pours over the edge of the glass and is equally distributed over two glasses standing under. If the overflowed glass is at the bottom level, then the champagne pours on the table. For the purpose of this problem we consider that champagne is distributed among pyramid glasses immediately. Vlad is interested in the number of completely full glasses if he stops pouring champagne in t seconds.Pictures below illustrate the pyramid consisting of three levels.   ", "input_spec": "The only line of the input contains two integers n and t (1\u2009\u2264\u2009n\u2009\u2264\u200910,\u20090\u2009\u2264\u2009t\u2009\u2264\u200910\u2009000)\u00a0\u2014 the height of the pyramid and the number of seconds Vlad will be pouring champagne from the bottle.", "output_spec": "Print the single integer\u00a0\u2014 the number of completely full glasses after t seconds.", "sample_inputs": ["3 5", "4 8"], "sample_outputs": ["4", "6"], "notes": "NoteIn the first sample, the glasses full after 5 seconds are: the top glass, both glasses on the second level and the middle glass at the bottom level. Left and right glasses of the bottom level will be half-empty."}, "src_uid": "b2b49b7f6e3279d435766085958fb69d"}
{"nl": {"description": "Modern text editors usually show some information regarding the document being edited. For example, the number of words, the number of pages, or the number of characters.In this problem you should implement the similar functionality.You are given a string which only consists of:  uppercase and lowercase English letters,  underscore symbols (they are used as separators),  parentheses (both opening and closing). It is guaranteed that each opening parenthesis has a succeeding closing parenthesis. Similarly, each closing parentheses has a preceding opening parentheses matching it. For each pair of matching parentheses there are no other parenthesis between them. In other words, each parenthesis in the string belongs to a matching \"opening-closing\" pair, and such pairs can't be nested.For example, the following string is valid: \"_Hello_Vasya(and_Petya)__bye_(and_OK)\".Word is a maximal sequence of consecutive letters, i.e. such sequence that the first character to the left and the first character to the right of it is an underscore, a parenthesis, or it just does not exist. For example, the string above consists of seven words: \"Hello\", \"Vasya\", \"and\", \"Petya\", \"bye\", \"and\" and \"OK\". Write a program that finds:  the length of the longest word outside the parentheses (print 0, if there is no word outside the parentheses),  the number of words inside the parentheses (print 0, if there is no word inside the parentheses). ", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009255)\u00a0\u2014 the length of the given string. The second line contains the string consisting of only lowercase and uppercase English letters, parentheses and underscore symbols. ", "output_spec": "Print two space-separated integers:   the length of the longest word outside the parentheses (print 0, if there is no word outside the parentheses),  the number of words inside the parentheses (print 0, if there is no word inside the parentheses). ", "sample_inputs": ["37\n_Hello_Vasya(and_Petya)__bye_(and_OK)", "37\n_a_(_b___c)__de_f(g_)__h__i(j_k_l)m__", "27\n(LoooonG)__shOrt__(LoooonG)", "5\n(___)"], "sample_outputs": ["5 4", "2 6", "5 2", "0 0"], "notes": "NoteIn the first sample, the words \"Hello\", \"Vasya\" and \"bye\" are outside any of the parentheses, and the words \"and\", \"Petya\", \"and\" and \"OK\" are inside. Note, that the word \"and\" is given twice and you should count it twice in the answer."}, "src_uid": "fc86df4931e787fa3a1a40e2aecf0b92"}
{"nl": {"description": "Your search for Heidi is over \u2013 you finally found her at a library, dressed up as a human. In fact, she has spent so much time there that she now runs the place! Her job is to buy books and keep them at the library so that people can borrow and read them. There are n different books, numbered 1 through n.We will look at the library's operation during n consecutive days. Heidi knows in advance that on the i-th day (1\u2009\u2264\u2009i\u2009\u2264\u2009n) precisely one person will come to the library, request to borrow the book ai, read it in a few hours, and return the book later on the same day.Heidi desperately wants to please all her guests, so she will make sure to always have the book ai available in the library on the i-th day. During the night before the i-th day, she has the option of going to the bookstore (which operates at nights to avoid competition with the library) and buying any book for the price of 1 CHF. Of course, if she already has a book at the library, she does not need to buy it again. Initially, the library contains no books.There is a problem, though. The capacity of the library is k \u2013 this means that at any time, there can be at most k books at the library. If buying a new book would cause Heidi to have more than k books, she must first get rid of some book that she already has, in order to make room for the new book. If she later needs a book that she got rid of, she will need to buy that book again.You are given k and the sequence of requests for books a1,\u2009a2,\u2009...,\u2009an. What is the minimum cost (in CHF) of buying new books to satisfy all the requests?", "input_spec": "The first line of input will contain two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u200980). The second line will contain n integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009n) \u2013 the sequence of book requests.", "output_spec": "On a single line print the minimum cost of buying books at the store so as to satisfy all requests.", "sample_inputs": ["4 80\n1 2 2 1", "4 1\n1 2 2 1", "4 2\n1 2 3 1"], "sample_outputs": ["2", "3", "3"], "notes": "NoteIn the first test case, Heidi is able to keep all books forever. Therefore, she only needs to buy the book 1 before the first day and the book 2 before the second day.In the second test case, she can only keep one book at a time. Therefore she will need to buy new books on the first, second and fourth day.In the third test case, before buying book 3 on the third day, she must decide which of the books 1 and 2 she should get rid of. Of course, she should keep the book 1, which will be requested on the fourth day."}, "src_uid": "956228e31679caa9952b216e010f9773"}
{"nl": {"description": "This winter is so cold in Nvodsk! A group of n friends decided to buy k bottles of a soft drink called \"Take-It-Light\" to warm up a bit. Each bottle has l milliliters of the drink. Also they bought c limes and cut each of them into d slices. After that they found p grams of salt.To make a toast, each friend needs nl milliliters of the drink, a slice of lime and np grams of salt. The friends want to make as many toasts as they can, provided they all drink the same amount. How many toasts can each friend make?", "input_spec": "The first and only line contains positive integers n, k, l, c, d, p, nl, np, not exceeding 1000 and no less than 1. The numbers are separated by exactly one space.", "output_spec": "Print a single integer \u2014 the number of toasts each friend can make.", "sample_inputs": ["3 4 5 10 8 100 3 1", "5 100 10 1 19 90 4 3", "10 1000 1000 25 23 1 50 1"], "sample_outputs": ["2", "3", "0"], "notes": "NoteA comment to the first sample: Overall the friends have 4\u2009*\u20095\u2009=\u200920 milliliters of the drink, it is enough to make 20\u2009/\u20093\u2009=\u20096 toasts. The limes are enough for 10\u2009*\u20098\u2009=\u200980 toasts and the salt is enough for 100\u2009/\u20091\u2009=\u2009100 toasts. However, there are 3 friends in the group, so the answer is min(6,\u200980,\u2009100)\u2009/\u20093\u2009=\u20092."}, "src_uid": "67410b7d36b9d2e6a97ca5c7cff317c1"}
{"nl": {"description": "A string is a palindrome if it reads the same from the left to the right and from the right to the left. For example, the strings \"kek\", \"abacaba\", \"r\" and \"papicipap\" are palindromes, while the strings \"abb\" and \"iq\" are not.A substring $$$s[l \\ldots r]$$$ ($$$1\u2009\\leq\u2009l\u2009\\leq\u2009r\u2009\\leq\u2009|s|$$$) of a string $$$s\u2009=\u2009s_{1}s_{2} \\ldots s_{|s|}$$$ is the string $$$s_{l}s_{l\u2009+\u20091} \\ldots s_{r}$$$.Anna does not like palindromes, so she makes her friends call her Ann. She also changes all the words she reads in a similar way. Namely, each word $$$s$$$ is changed into its longest substring that is not a palindrome. If all the substrings of $$$s$$$ are palindromes, she skips the word at all.Some time ago Ann read the word $$$s$$$. What is the word she changed it into?", "input_spec": "The first line contains a non-empty string $$$s$$$ with length at most $$$50$$$ characters, containing lowercase English letters only.", "output_spec": "If there is such a substring in $$$s$$$ that is not a palindrome, print the maximum length of such a substring. Otherwise print $$$0$$$. Note that there can be multiple longest substrings that are not palindromes, but their length is unique.", "sample_inputs": ["mew", "wuffuw", "qqqqqqqq"], "sample_outputs": ["3", "5", "0"], "notes": "Note\"mew\" is not a palindrome, so the longest substring of it that is not a palindrome, is the string \"mew\" itself. Thus, the answer for the first example is $$$3$$$.The string \"uffuw\" is one of the longest non-palindrome substrings (of length $$$5$$$) of the string \"wuffuw\", so the answer for the second example is $$$5$$$.All substrings of the string \"qqqqqqqq\" consist of equal characters so they are palindromes. This way, there are no non-palindrome substrings. Thus, the answer for the third example is $$$0$$$."}, "src_uid": "6c85175d334f811617e7030e0403f706"}
{"nl": {"description": "wHAT DO WE NEED cAPS LOCK FOR?Caps lock is a computer keyboard key. Pressing it sets an input mode in which typed letters are capital by default. If it is pressed by accident, it leads to accidents like the one we had in the first passage. Let's consider that a word has been typed with the Caps lock key accidentally switched on, if:   either it only contains uppercase letters;  or all letters except for the first one are uppercase. In this case we should automatically change the case of all letters. For example, the case of the letters that form words \"hELLO\", \"HTTP\", \"z\" should be changed.Write a program that applies the rule mentioned above. If the rule cannot be applied, the program should leave the word unchanged.", "input_spec": "The first line of the input data contains a word consisting of uppercase and lowercase Latin letters. The word's length is from 1 to 100 characters, inclusive.", "output_spec": "Print the result of the given word's processing.", "sample_inputs": ["cAPS", "Lock"], "sample_outputs": ["Caps", "Lock"], "notes": null}, "src_uid": "db0eb44d8cd8f293da407ba3adee10cf"}
{"nl": {"description": "Mad scientist Mike is busy carrying out experiments in chemistry. Today he will attempt to join three atoms into one molecule.A molecule consists of atoms, with some pairs of atoms connected by atomic bonds. Each atom has a valence number \u2014 the number of bonds the atom must form with other atoms. An atom can form one or multiple bonds with any other atom, but it cannot form a bond with itself. The number of bonds of an atom in the molecule must be equal to its valence number.  Mike knows valence numbers of the three atoms. Find a molecule that can be built from these atoms according to the stated rules, or determine that it is impossible.", "input_spec": "The single line of the input contains three space-separated integers a, b and c (1\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u2009106) \u2014 the valence numbers of the given atoms.", "output_spec": "If such a molecule can be built, print three space-separated integers \u2014 the number of bonds between the 1-st and the 2-nd, the 2-nd and the 3-rd, the 3-rd and the 1-st atoms, correspondingly. If there are multiple solutions, output any of them. If there is no solution, print \"Impossible\" (without the quotes).", "sample_inputs": ["1 1 2", "3 4 5", "4 1 1"], "sample_outputs": ["0 1 1", "1 3 2", "Impossible"], "notes": "NoteThe first sample corresponds to the first figure. There are no bonds between atoms 1 and 2 in this case.The second sample corresponds to the second figure. There is one or more bonds between each pair of atoms.The third sample corresponds to the third figure. There is no solution, because an atom cannot form bonds with itself.The configuration in the fourth figure is impossible as each atom must have at least one atomic bond."}, "src_uid": "b3b986fddc3770fed64b878fa42ab1bc"}
{"nl": {"description": "\u0415\u0441\u0442\u044c n-\u043f\u043e\u0434\u044a\u0435\u0437\u0434\u043d\u044b\u0439 \u0434\u043e\u043c, \u0432 \u043a\u0430\u0436\u0434\u043e\u043c \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0435 \u043f\u043e m \u044d\u0442\u0430\u0436\u0435\u0439, \u0438 \u043d\u0430 \u043a\u0430\u0436\u0434\u043e\u043c \u044d\u0442\u0430\u0436\u0435 \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0430 \u0440\u043e\u0432\u043d\u043e k \u043a\u0432\u0430\u0440\u0442\u0438\u0440. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u0432 \u0434\u043e\u043c\u0435 \u0432\u0441\u0435\u0433\u043e n\u00b7m\u00b7k \u043a\u0432\u0430\u0440\u0442\u0438\u0440. \u041e\u043d\u0438 \u043f\u0440\u043e\u043d\u0443\u043c\u0435\u0440\u043e\u0432\u0430\u043d\u044b \u0435\u0441\u0442\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043e\u0442 1 \u0434\u043e n\u00b7m\u00b7k, 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\u0432\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u043b\u0435\u0434\u0443\u044e\u0442 \u0442\u0440\u0438 \u0447\u0438\u0441\u043b\u0430 n, m, k (1\u2009\u2264\u2009n,\u2009m,\u2009k\u2009\u2264\u20091000)\u00a0\u2014 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u043e\u0432 \u0432 \u0434\u043e\u043c\u0435, \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u044d\u0442\u0430\u0436\u0435\u0439 \u0432 \u043a\u0430\u0436\u0434\u043e\u043c \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0435 \u0438 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043a\u0432\u0430\u0440\u0442\u0438\u0440 \u043d\u0430 \u043a\u0430\u0436\u0434\u043e\u043c \u044d\u0442\u0430\u0436\u0435 \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0430 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e. \u0412\u043e \u0432\u0442\u043e\u0440\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0438\u0441\u0430\u043d\u044b \u0434\u0432\u0430 \u0447\u0438\u0441\u043b\u0430 a \u0438 b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009n\u00b7m\u00b7k)\u00a0\u2014 \u043d\u043e\u043c\u0435\u0440\u0430 \u043a\u0432\u0430\u0440\u0442\u0438\u0440, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0436\u0438\u0432\u0443\u0442 \u042d\u0434\u0432\u0430\u0440\u0434 \u0438 \u041d\u0430\u0442\u0430\u0448\u0430, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e. \u0413\u0430\u0440\u0430\u043d\u0442\u0438\u0440\u0443\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u044d\u0442\u0438 \u043d\u043e\u043c\u0435\u0440\u0430 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b. ", "output_spec": "\u0412\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0446\u0435\u043b\u043e\u0435 \u0447\u0438\u0441\u043b\u043e\u00a0\u2014 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f (\u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0430\u0445), \u0437\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u042d\u0434\u0432\u0430\u0440\u0434 \u0441\u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u043e\u0442 \u0441\u0432\u043e\u0435\u0439 \u043a\u0432\u0430\u0440\u0442\u0438\u0440\u044b \u0434\u043e \u043a\u0432\u0430\u0440\u0442\u0438\u0440\u044b \u041d\u0430\u0442\u0430\u0448\u0438.", "sample_inputs": ["4 10 5\n200 6", "3 1 5\n7 2"], "sample_outputs": ["39", "15"], "notes": "\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435\u0412 \u043f\u0435\u0440\u0432\u043e\u043c \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u042d\u0434\u0432\u0430\u0440\u0434 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 4 \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0435 \u043d\u0430 10 \u044d\u0442\u0430\u0436\u0435, \u0430 \u041d\u0430\u0442\u0430\u0448\u0430 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 1 \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0435 \u043d\u0430 2 \u044d\u0442\u0430\u0436\u0435. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u042d\u0434\u0432\u0430\u0440\u0434\u0443 \u0432\u044b\u0433\u043e\u0434\u043d\u043e \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0441\u043f\u0443\u0441\u0442\u0438\u0442\u044c\u0441\u044f \u043d\u0430 \u043b\u0438\u0444\u0442\u0435 \u043d\u0430 \u043f\u0435\u0440\u0432\u044b\u0439 \u044d\u0442\u0430\u0436 (\u043d\u0430 \u044d\u0442\u043e \u043e\u043d \u043f\u043e\u0442\u0440\u0430\u0442\u0438\u0442 19 \u0441\u0435\u043a\u0443\u043d\u0434, \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 10\u00a0\u2014 \u043d\u0430 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u0435 \u0438 9\u00a0\u2014 \u043d\u0430 \u043f\u043e\u0435\u0437\u0434\u043a\u0443 \u043d\u0430 \u043b\u0438\u0444\u0442\u0435), \u0437\u0430\u0442\u0435\u043c \u043e\u0431\u043e\u0439\u0442\u0438 \u0434\u043e\u043c \u043f\u0440\u043e\u0442\u0438\u0432 \u0447\u0430\u0441\u043e\u0432\u043e\u0439 \u0441\u0442\u0440\u0435\u043b\u043a\u0438 \u0434\u043e \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0430 \u043d\u043e\u043c\u0435\u0440 1 (\u043d\u0430 \u044d\u0442\u043e \u043e\u043d \u043f\u043e\u0442\u0440\u0430\u0442\u0438\u0442 15 \u0441\u0435\u043a\u0443\u043d\u0434), \u0438 \u043d\u0430\u043a\u043e\u043d\u0435\u0446 \u043f\u043e\u0434\u043d\u044f\u0442\u044c\u0441\u044f \u043f\u043e \u043b\u0435\u0441\u0442\u043d\u0438\u0446\u0435 \u043d\u0430 \u044d\u0442\u0430\u0436 \u043d\u043e\u043c\u0435\u0440 2 (\u043d\u0430 \u044d\u0442\u043e \u043e\u043d \u043f\u043e\u0442\u0440\u0430\u0442\u0438\u0442 5 \u0441\u0435\u043a\u0443\u043d\u0434). \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043e\u0442\u0432\u0435\u0442 \u0440\u0430\u0432\u0435\u043d 19\u2009+\u200915\u2009+\u20095\u2009=\u200939.\u0412\u043e \u0432\u0442\u043e\u0440\u043e\u043c \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u042d\u0434\u0432\u0430\u0440\u0434 \u0436\u0438\u0432\u0451\u0442 \u0432 \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0435 2 \u043d\u0430 \u044d\u0442\u0430\u0436\u0435 1, \u0430 \u041d\u0430\u0442\u0430\u0448\u0430 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0435 1 \u043d\u0430 \u044d\u0442\u0430\u0436\u0435 1. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u042d\u0434\u0432\u0430\u0440\u0434\u0443 \u0432\u044b\u0433\u043e\u0434\u043d\u043e \u043f\u0440\u043e\u0441\u0442\u043e \u043e\u0431\u043e\u0439\u0442\u0438 \u0434\u043e\u043c \u043f\u043e \u0447\u0430\u0441\u043e\u0432\u043e\u0439 \u0441\u0442\u0440\u0435\u043b\u043a\u0435 \u0434\u043e \u043f\u043e\u0434\u044a\u0435\u0437\u0434\u0430 1, \u043d\u0430 \u044d\u0442\u043e \u043e\u043d \u043f\u043e\u0442\u0440\u0430\u0442\u0438\u0442 15 \u0441\u0435\u043a\u0443\u043d\u0434."}, "src_uid": "c37b46851abcf7eb472869bd1ab9f793"}
{"nl": {"description": "A little girl loves problems on bitwise operations very much. Here's one of them.You are given two integers l and r. Let's consider the values of  for all pairs of integers a and b (l\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u2009r). Your task is to find the maximum value among all considered ones.Expression  means applying bitwise excluding or operation to integers x and y. The given operation exists in all modern programming languages, for example, in languages C++ and Java it is represented as \"^\", in Pascal \u2014 as \"xor\".", "input_spec": "The single line contains space-separated integers l and r (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u20091018). Please, do not use the %lld specifier to read or write 64-bit integers in C++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "In a single line print a single integer \u2014 the maximum value of  for all pairs of integers a, b (l\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u2009r).", "sample_inputs": ["1 2", "8 16", "1 1"], "sample_outputs": ["3", "31", "0"], "notes": null}, "src_uid": "d90e99d539b16590c17328d79a5921e0"}
{"nl": {"description": "You might have heard about the next game in Lara Croft series coming out this year. You also might have watched its trailer. Though you definitely missed the main idea about its plot, so let me lift the veil of secrecy.Lara is going to explore yet another dangerous dungeon. Game designers decided to use good old 2D environment. The dungeon can be represented as a rectangle matrix of n rows and m columns. Cell (x,\u2009y) is the cell in the x-th row in the y-th column. Lara can move between the neighbouring by side cells in all four directions.Moreover, she has even chosen the path for herself to avoid all the traps. She enters the dungeon in cell (1,\u20091), that is top left corner of the matrix. Then she goes down all the way to cell (n,\u20091) \u2014 the bottom left corner. Then she starts moving in the snake fashion \u2014 all the way to the right, one cell up, then to the left to the cell in 2-nd column, one cell up. She moves until she runs out of non-visited cells. n and m given are such that she always end up in cell (1,\u20092).Lara has already moved to a neighbouring cell k times. Can you determine her current position?", "input_spec": "The only line contains three integers n, m and k (2\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009109, n is always even, 0\u2009\u2264\u2009k\u2009<\u2009n\u00b7m). Note that k doesn't fit into 32-bit integer type!", "output_spec": "Print the cell (the row and the column where the cell is situated) where Lara ends up after she moves k times.", "sample_inputs": ["4 3 0", "4 3 11", "4 3 7"], "sample_outputs": ["1 1", "1 2", "3 2"], "notes": "NoteHere is her path on matrix 4 by 3:  "}, "src_uid": "e88bb7621c7124c54e75109a00f96301"}
{"nl": {"description": "Limak is a little polar bear. He has n balls, the i-th ball has size ti.Limak wants to give one ball to each of his three friends. Giving gifts isn't easy\u00a0\u2014 there are two rules Limak must obey to make friends happy:  No two friends can get balls of the same size.  No two friends can get balls of sizes that differ by more than 2. For example, Limak can choose balls with sizes 4, 5 and 3, or balls with sizes 90, 91 and 92. But he can't choose balls with sizes 5, 5 and 6 (two friends would get balls of the same size), and he can't choose balls with sizes 30, 31 and 33 (because sizes 30 and 33 differ by more than 2).Your task is to check whether Limak can choose three balls that satisfy conditions above.", "input_spec": "The first line of the input contains one integer n (3\u2009\u2264\u2009n\u2009\u2264\u200950)\u00a0\u2014 the number of balls Limak has. The second line contains n integers t1,\u2009t2,\u2009...,\u2009tn (1\u2009\u2264\u2009ti\u2009\u2264\u20091000) where ti denotes the size of the i-th ball.", "output_spec": "Print \"YES\" (without quotes) if Limak can choose three balls of distinct sizes, such that any two of them differ by no more than 2. Otherwise, print \"NO\" (without quotes).", "sample_inputs": ["4\n18 55 16 17", "6\n40 41 43 44 44 44", "8\n5 972 3 4 1 4 970 971"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteIn the first sample, there are 4 balls and Limak is able to choose three of them to satisfy the rules. He must must choose balls with sizes 18, 16 and 17.In the second sample, there is no way to give gifts to three friends without breaking the rules.In the third sample, there is even more than one way to choose balls:  Choose balls with sizes 3, 4 and 5.  Choose balls with sizes 972, 970, 971. "}, "src_uid": "d6c876a84c7b92141710be5d76536eab"}
{"nl": {"description": "One day student Vasya was sitting on a lecture and mentioned a string s1s2... sn, consisting of letters \"a\", \"b\" and \"c\" that was written on his desk. As the lecture was boring, Vasya decided to complete the picture by composing a graph G with the following properties:   G has exactly n vertices, numbered from 1 to n.  For all pairs of vertices i and j, where i\u2009\u2260\u2009j, there is an edge connecting them if and only if characters si and sj are either equal or neighbouring in the alphabet. That is, letters in pairs \"a\"-\"b\" and \"b\"-\"c\" are neighbouring, while letters \"a\"-\"c\" are not. Vasya painted the resulting graph near the string and then erased the string. Next day Vasya's friend Petya came to a lecture and found some graph at his desk. He had heard of Vasya's adventure and now he wants to find out whether it could be the original graph G, painted by Vasya. In order to verify this, Petya needs to know whether there exists a string s, such that if Vasya used this s he would produce the given graph G.", "input_spec": "The first line of the input contains two integers n and m \u00a0\u2014 the number of vertices and edges in the graph found by Petya, respectively. Each of the next m lines contains two integers ui and vi (1\u2009\u2264\u2009ui,\u2009vi\u2009\u2264\u2009n,\u2009ui\u2009\u2260\u2009vi)\u00a0\u2014 the edges of the graph G. It is guaranteed, that there are no multiple edges, that is any pair of vertexes appear in this list no more than once.", "output_spec": "In the first line print \"Yes\" (without the quotes), if the string s Petya is interested in really exists and \"No\" (without the quotes) otherwise. If the string s exists, then print it on the second line of the output. The length of s must be exactly n, it must consist of only letters \"a\", \"b\" and \"c\" only, and the graph built using this string must coincide with G. If there are multiple possible answers, you may print any of them.", "sample_inputs": ["2 1\n1 2", "4 3\n1 2\n1 3\n1 4"], "sample_outputs": ["Yes\naa", "No"], "notes": "NoteIn the first sample you are given a graph made of two vertices with an edge between them. So, these vertices can correspond to both the same and adjacent letters. Any of the following strings \"aa\", \"ab\", \"ba\", \"bb\", \"bc\", \"cb\", \"cc\" meets the graph's conditions. In the second sample the first vertex is connected to all three other vertices, but these three vertices are not connected with each other. That means that they must correspond to distinct letters that are not adjacent, but that is impossible as there are only two such letters: a and c."}, "src_uid": "e71640f715f353e49745eac5f72e682a"}
{"nl": {"description": "A new delivery of clothing has arrived today to the clothing store. This delivery consists of $$$a$$$ ties, $$$b$$$ scarves, $$$c$$$ vests and $$$d$$$ jackets.The store does not sell single clothing items \u2014 instead, it sells suits of two types:  a suit of the first type consists of one tie and one jacket;  a suit of the second type consists of one scarf, one vest and one jacket. Each suit of the first type costs $$$e$$$ coins, and each suit of the second type costs $$$f$$$ coins.Calculate the maximum possible cost of a set of suits that can be composed from the delivered clothing items. Note that one item cannot be used in more than one suit (though some items may be left unused).", "input_spec": "The first line contains one integer $$$a$$$ $$$(1 \\le a \\le 100\\,000)$$$ \u2014 the number of ties. The second line contains one integer $$$b$$$ $$$(1 \\le b \\le 100\\,000)$$$ \u2014 the number of scarves. The third line contains one integer $$$c$$$ $$$(1 \\le c \\le 100\\,000)$$$ \u2014 the number of vests. The fourth line contains one integer $$$d$$$ $$$(1 \\le d \\le 100\\,000)$$$ \u2014 the number of jackets. The fifth line contains one integer $$$e$$$ $$$(1 \\le e \\le 1\\,000)$$$ \u2014 the cost of one suit of the first type. The sixth line contains one integer $$$f$$$ $$$(1 \\le f \\le 1\\,000)$$$ \u2014 the cost of one suit of the second type.", "output_spec": "Print one integer \u2014 the maximum total cost of some set of suits that can be composed from the delivered items. ", "sample_inputs": ["4\n5\n6\n3\n1\n2", "12\n11\n13\n20\n4\n6", "17\n14\n5\n21\n15\n17"], "sample_outputs": ["6", "102", "325"], "notes": "NoteIt is possible to compose three suits of the second type in the first example, and their total cost will be $$$6$$$. Since all jackets will be used, it's impossible to add anything to this set.The best course of action in the second example is to compose nine suits of the first type and eleven suits of the second type. The total cost is $$$9 \\cdot 4 + 11 \\cdot 6 = 102$$$."}, "src_uid": "84d9e7e9c9541d997e6573edb421ae0a"}
{"nl": {"description": "Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits other than 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.Lucky number is super lucky if it's decimal representation contains equal amount of digits 4 and 7. For example, numbers 47, 7744, 474477 are super lucky and 4, 744, 467 are not.One day Petya came across a positive integer n. Help him to find the least super lucky number which is not less than n.", "input_spec": "The only line contains a positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u200910100000). This number doesn't have leading zeroes.", "output_spec": "Output the least super lucky number that is more than or equal to n.", "sample_inputs": ["4500", "47"], "sample_outputs": ["4747", "47"], "notes": null}, "src_uid": "77b5f83cdadf4b0743618a46b646a849"}
{"nl": {"description": "Once upon a time a child got a test consisting of multiple-choice questions as homework. A multiple-choice question consists of four choices: A, B, C and D. Each choice has a description, and the child should find out the only one that is correct.Fortunately the child knows how to solve such complicated test. The child will follow the algorithm:  If there is some choice whose description at least twice shorter than all other descriptions, or at least twice longer than all other descriptions, then the child thinks the choice is great.  If there is exactly one great choice then the child chooses it. Otherwise the child chooses C (the child think it is the luckiest choice). You are given a multiple-choice questions, can you predict child's choose?", "input_spec": "The first line starts with \"A.\" (without quotes), then followed the description of choice A. The next three lines contains the descriptions of the other choices in the same format. They are given in order: B, C, D. Please note, that the description goes after prefix \"X.\", so the prefix mustn't be counted in description's length. Each description is non-empty and consists of at most 100 characters. Each character can be either uppercase English letter or lowercase English letter, or \"_\". ", "output_spec": "Print a single line with the child's choice: \"A\", \"B\", \"C\" or \"D\" (without quotes).", "sample_inputs": ["A.VFleaKing_is_the_author_of_this_problem\nB.Picks_is_the_author_of_this_problem\nC.Picking_is_the_author_of_this_problem\nD.Ftiasch_is_cute", "A.ab\nB.abcde\nC.ab\nD.abc", "A.c\nB.cc\nC.c\nD.c"], "sample_outputs": ["D", "C", "B"], "notes": "NoteIn the first sample, the first choice has length 39, the second one has length 35, the third one has length 37, and the last one has length 15. The choice D (length 15) is twice shorter than all other choices', so it is great choice. There is no other great choices so the child will choose D.In the second sample, no choice is great, so the child will choose the luckiest choice C.In the third sample, the choice B (length 2) is twice longer than all other choices', so it is great choice. There is no other great choices so the child will choose B."}, "src_uid": "30725e340dc07f552f0cce359af226a4"}
{"nl": {"description": "You have a map as a rectangle table. Each cell of the table is either an obstacle, or a treasure with a certain price, or a bomb, or an empty cell. Your initial position is also given to you.You can go from one cell of the map to a side-adjacent one. At that, you are not allowed to go beyond the borders of the map, enter the cells with treasures, obstacles and bombs. To pick the treasures, you need to build a closed path (starting and ending in the starting cell). The closed path mustn't contain any cells with bombs inside. Let's assume that the sum of the treasures' values that are located inside the closed path equals v, and besides, you've made k single moves (from one cell to another) while you were going through the path, then such path brings you the profit of v\u2009-\u2009k rubles.Your task is to build a closed path that doesn't contain any bombs and brings maximum profit.Note that the path can have self-intersections. In order to determine if a cell lies inside a path or not, use the following algorithm:  Assume that the table cells are points on the plane (the table cell on the intersection of the i-th column and the j-th row is point (i,\u2009j)). And the given path is a closed polyline that goes through these points.  You need to find out if the point p of the table that is not crossed by the polyline lies inside the polyline.  Let's draw a ray that starts from point p and does not intersect other points of the table (such ray must exist).  Let's count the number of segments of the polyline that intersect the painted ray. If this number is odd, we assume that point p (and consequently, the table cell) lie inside the polyline (path). Otherwise, we assume that it lies outside. ", "input_spec": "The first line contains two integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200920) \u2014 the sizes of the table. Next n lines each contains m characters \u2014 the description of the table. The description means the following:   character \"B\" is a cell with a bomb;  character \"S\" is the starting cell, you can assume that it's empty;  digit c (1-8) is treasure with index c;  character \".\" is an empty cell;  character \"#\" is an obstacle.  Assume that the map has t treasures. Next t lines contain the prices of the treasures. The i-th line contains the price of the treasure with index i, vi (\u2009-\u2009200\u2009\u2264\u2009vi\u2009\u2264\u2009200). It is guaranteed that the treasures are numbered from 1 to t. It is guaranteed that the map has not more than 8 objects in total. Objects are bombs and treasures. It is guaranteed that the map has exactly one character \"S\".", "output_spec": "Print a single integer \u2014 the maximum possible profit you can get.", "sample_inputs": ["4 4\n....\n.S1.\n....\n....\n10", "7 7\n.......\n.1###2.\n.#...#.\n.#.B.#.\n.3...4.\n..##...\n......S\n100\n100\n100\n100", "7 8\n........\n........\n....1B..\n.S......\n....2...\n3.......\n........\n100\n-100\n100", "1 1\nS"], "sample_outputs": ["2", "364", "0", "0"], "notes": "NoteIn the first example the answer will look as follows.  In the second example the answer will look as follows.  In the third example you cannot get profit.In the fourth example you cannot get profit as you cannot construct a closed path with more than one cell."}, "src_uid": "624a0d6cf305fcf67d3f1cdc1c5fef8d"}
{"nl": {"description": "Reforms have started in Berland again! At this time, the Parliament is discussing the reform of the calendar. To make the lives of citizens of Berland more varied, it was decided to change the calendar. As more and more people are complaining that \"the years fly by...\", it was decided that starting from the next year the number of days per year will begin to grow. So the coming year will have exactly a days, the next after coming year will have a\u2009+\u20091 days, the next one will have a\u2009+\u20092 days and so on. This schedule is planned for the coming n years (in the n-th year the length of the year will be equal a\u2009+\u2009n\u2009-\u20091 day).No one has yet decided what will become of months. An MP Palevny made the following proposal.   The calendar for each month is comfortable to be printed on a square sheet of paper. We are proposed to make the number of days in each month be the square of some integer. The number of days per month should be the same for each month of any year, but may be different for different years.  The number of days in each year must be divisible by the number of days per month in this year. This rule ensures that the number of months in each year is an integer.  The number of days per month for each year must be chosen so as to save the maximum amount of paper to print the calendars. In other words, the number of days per month should be as much as possible. These rules provide an unambiguous method for choosing the number of days in each month for any given year length. For example, according to Palevny's proposition, a year that consists of 108 days will have three months, 36 days each. The year that consists of 99 days will have 11 months, 9 days each, and a year of 365 days will have 365 months, one day each.The proposal provoked heated discussion in the community, the famous mathematician Perelmanov quickly calculated that if the proposal is supported, then in a period of n years, beginning with the year that has a days, the country will spend p sheets of paper to print a set of calendars for these years. Perelmanov's calculations take into account the fact that the set will contain one calendar for each year and each month will be printed on a separate sheet.Repeat Perelmanov's achievement and print the required number p. You are given positive integers a and n. Perelmanov warns you that your program should not work longer than four seconds at the maximum test.", "input_spec": "The only input line contains a pair of integers a, n (1\u2009\u2264\u2009a,\u2009n\u2009\u2264\u2009107; a\u2009+\u2009n\u2009-\u20091\u2009\u2264\u2009107).", "output_spec": "Print the required number p.  Please, do not use the %lld specifier to read or write 64-bit integers in C++. It is preferred to use cin, cout streams or the %I64d specifier.", "sample_inputs": ["25 3", "50 5"], "sample_outputs": ["30", "125"], "notes": "NoteA note to the first sample test. A year of 25 days will consist of one month containing 25 days. A year of 26 days will consist of 26 months, one day each. A year of 27 days will have three months, 9 days each."}, "src_uid": "915081861e391958dce6ee2a117abd4e"}
{"nl": {"description": "Recently, Vladimir got bad mark in algebra again. To avoid such unpleasant events in future he decided to train his arithmetic skills. He wrote four integer numbers a, b, c, d on the blackboard. During each of the next three minutes he took two numbers from the blackboard (not necessarily adjacent) and replaced them with their sum or their product. In the end he got one number. Unfortunately, due to the awful memory he forgot that number, but he remembers four original numbers, sequence of the operations and his surprise because of the very small result. Help Vladimir remember the forgotten number: find the smallest number that can be obtained from the original numbers by the given sequence of operations.", "input_spec": "First line contains four integers separated by space: 0\u2009\u2264\u2009a,\u2009b,\u2009c,\u2009d\u2009\u2264\u20091000 \u2014 the original numbers. Second line contains three signs ('+' or '*' each) separated by space \u2014 the sequence of the operations in the order of performing. ('+' stands for addition, '*' \u2014 multiplication)", "output_spec": "Output one integer number \u2014 the minimal result which can be obtained. Please, do not use %lld specificator to read or write 64-bit integers in C++. It is preffered to use cin (also you may use %I64d).", "sample_inputs": ["1 1 1 1\n+ + *", "2 2 2 2\n* * +", "1 2 3 4\n* + +"], "sample_outputs": ["3", "8", "9"], "notes": null}, "src_uid": "7a66fae63d9b27e444d84447012e484c"}
{"nl": {"description": "Carl is a beginner magician. He has a blue, b violet and c orange magic spheres. In one move he can transform two spheres of the same color into one sphere of any other color. To make a spell that has never been seen before, he needs at least x blue, y violet and z orange spheres. Can he get them (possible, in multiple actions)?", "input_spec": "The first line of the input contains three integers a, b and c (0\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u20091\u2009000\u2009000)\u00a0\u2014 the number of blue, violet and orange spheres that are in the magician's disposal. The second line of the input contains three integers, x, y and z (0\u2009\u2264\u2009x,\u2009y,\u2009z\u2009\u2264\u20091\u2009000\u2009000)\u00a0\u2014 the number of blue, violet and orange spheres that he needs to get.", "output_spec": "If the wizard is able to obtain the required numbers of spheres, print \"Yes\". Otherwise, print \"No\".", "sample_inputs": ["4 4 0\n2 1 2", "5 6 1\n2 7 2", "3 3 3\n2 2 2"], "sample_outputs": ["Yes", "No", "Yes"], "notes": "NoteIn the first sample the wizard has 4 blue and 4 violet spheres. In his first action he can turn two blue spheres into one violet one. After that he will have 2 blue and 5 violet spheres. Then he turns 4 violet spheres into 2 orange spheres and he ends up with 2 blue, 1 violet and 2 orange spheres, which is exactly what he needs."}, "src_uid": "1db4ba9dc1000e26532bb73336cf12c3"}
{"nl": {"description": "Tanechka is shopping in the toy shop. There are exactly $$$n$$$ toys in the shop for sale, the cost of the $$$i$$$-th toy is $$$i$$$ burles. She wants to choose two toys in such a way that their total cost is $$$k$$$ burles. How many ways to do that does she have?Each toy appears in the shop exactly once. Pairs $$$(a, b)$$$ and $$$(b, a)$$$ are considered equal. Pairs $$$(a, b)$$$, where $$$a=b$$$, are not allowed.", "input_spec": "The first line of the input contains two integers $$$n$$$, $$$k$$$ ($$$1 \\le n, k \\le 10^{14}$$$) \u2014 the number of toys and the expected total cost of the pair of toys.", "output_spec": "Print the number of ways to choose the pair of toys satisfying the condition above. Print 0, if Tanechka can choose no pair of toys in such a way that their total cost is $$$k$$$ burles.", "sample_inputs": ["8 5", "8 15", "7 20", "1000000000000 1000000000001"], "sample_outputs": ["2", "1", "0", "500000000000"], "notes": "NoteIn the first example Tanechka can choose the pair of toys ($$$1, 4$$$) or the pair of toys ($$$2, 3$$$).In the second example Tanechka can choose only the pair of toys ($$$7, 8$$$).In the third example choosing any pair of toys will lead to the total cost less than $$$20$$$. So the answer is 0.In the fourth example she can choose the following pairs: $$$(1, 1000000000000)$$$, $$$(2, 999999999999)$$$, $$$(3, 999999999998)$$$, ..., $$$(500000000000, 500000000001)$$$. The number of such pairs is exactly $$$500000000000$$$."}, "src_uid": "98624ab2fcd2a50a75788a29e04999ad"}
{"nl": {"description": "Melody Pond was stolen from her parents as a newborn baby by Madame Kovarian, to become a weapon of the Silence in their crusade against the Doctor. Madame Kovarian changed Melody's name to River Song, giving her a new identity that allowed her to kill the Eleventh Doctor.Heidi figured out that Madame Kovarian uses a very complicated hashing function in order to change the names of the babies she steals. In order to prevent this from happening to future Doctors, Heidi decided to prepare herself by learning some basic hashing techniques.The first hashing function she designed is as follows.Given two positive integers $$$(x, y)$$$ she defines $$$H(x,y):=x^2+2xy+x+1$$$.Now, Heidi wonders if the function is reversible. That is, given a positive integer $$$r$$$, can you find a pair $$$(x, y)$$$ (of positive integers) such that $$$H(x, y) = r$$$?If multiple such pairs exist, output the one with smallest possible $$$x$$$. If there is no such pair, output \"NO\".", "input_spec": "The first and only line contains an integer $$$r$$$ ($$$1 \\le r \\le 10^{12}$$$).", "output_spec": "Output integers $$$x, y$$$ such that $$$H(x,y) = r$$$ and $$$x$$$ is smallest possible, or \"NO\" if no such pair exists.", "sample_inputs": ["19", "16"], "sample_outputs": ["1 8", "NO"], "notes": null}, "src_uid": "3ff1c25a1026c90aeb14d148d7fb96ba"}
{"nl": {"description": "Recently a Golden Circle of Beetlovers was found in Byteland. It is a circle route going through $$$n \\cdot k$$$ cities. The cities are numerated from $$$1$$$ to $$$n \\cdot k$$$, the distance between the neighboring cities is exactly $$$1$$$ km.Sergey does not like beetles, he loves burgers. Fortunately for him, there are $$$n$$$ fast food restaurants on the circle, they are located in the $$$1$$$-st, the $$$(k + 1)$$$-st, the $$$(2k + 1)$$$-st, and so on, the $$$((n-1)k + 1)$$$-st cities, i.e. the distance between the neighboring cities with fast food restaurants is $$$k$$$ km.Sergey began his journey at some city $$$s$$$ and traveled along the circle, making stops at cities each $$$l$$$ km ($$$l > 0$$$), until he stopped in $$$s$$$ once again. Sergey then forgot numbers $$$s$$$ and $$$l$$$, but he remembers that the distance from the city $$$s$$$ to the nearest fast food restaurant was $$$a$$$ km, and the distance from the city he stopped at after traveling the first $$$l$$$ km from $$$s$$$ to the nearest fast food restaurant was $$$b$$$ km. Sergey always traveled in the same direction along the circle, but when he calculated distances to the restaurants, he considered both directions.Now Sergey is interested in two integers. The first integer $$$x$$$ is the minimum number of stops (excluding the first) Sergey could have done before returning to $$$s$$$. The second integer $$$y$$$ is the maximum number of stops (excluding the first) Sergey could have done before returning to $$$s$$$.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n, k \\le 100\\,000$$$)\u00a0\u2014 the number of fast food restaurants on the circle and the distance between the neighboring restaurants, respectively. The second line contains two integers $$$a$$$ and $$$b$$$ ($$$0 \\le a, b \\le \\frac{k}{2}$$$)\u00a0\u2014 the distances to the nearest fast food restaurants from the initial city and from the city Sergey made the first stop at, respectively.", "output_spec": "Print the two integers $$$x$$$ and $$$y$$$.", "sample_inputs": ["2 3\n1 1", "3 2\n0 0", "1 10\n5 3"], "sample_outputs": ["1 6", "1 3", "5 5"], "notes": "NoteIn the first example the restaurants are located in the cities $$$1$$$ and $$$4$$$, the initial city $$$s$$$ could be $$$2$$$, $$$3$$$, $$$5$$$, or $$$6$$$. The next city Sergey stopped at could also be at cities $$$2, 3, 5, 6$$$. Let's loop through all possible combinations of these cities. If both $$$s$$$ and the city of the first stop are at the city $$$2$$$ (for example, $$$l = 6$$$), then Sergey is at $$$s$$$ after the first stop already, so $$$x = 1$$$. In other pairs Sergey needs $$$1, 2, 3$$$, or $$$6$$$ stops to return to $$$s$$$, so $$$y = 6$$$.In the second example Sergey was at cities with fast food restaurant both initially and after the first stop, so $$$l$$$ is $$$2$$$, $$$4$$$, or $$$6$$$. Thus $$$x = 1$$$, $$$y = 3$$$.In the third example there is only one restaurant, so the possible locations of $$$s$$$ and the first stop are: $$$(6, 8)$$$ and $$$(6, 4)$$$. For the first option $$$l = 2$$$, for the second $$$l = 8$$$. In both cases Sergey needs $$$x=y=5$$$ stops to go to $$$s$$$."}, "src_uid": "5bb4adff1b332f43144047955eefba0c"}
{"nl": {"description": "Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.Petya calls a number almost lucky if it could be evenly divided by some lucky number. Help him find out if the given number n is almost lucky.", "input_spec": "The single line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091000) \u2014 the number that needs to be checked.", "output_spec": "In the only line print \"YES\" (without the quotes), if number n is almost lucky. Otherwise, print \"NO\" (without the quotes).", "sample_inputs": ["47", "16", "78"], "sample_outputs": ["YES", "YES", "NO"], "notes": "NoteNote that all lucky numbers are almost lucky as any number is evenly divisible by itself.In the first sample 47 is a lucky number. In the second sample 16 is divisible by 4."}, "src_uid": "78cf8bc7660dbd0602bf6e499bc6bb0d"}
{"nl": {"description": "One day Greg and his friends were walking in the forest. Overall there were n people walking, including Greg. Soon he found himself in front of a river. The guys immediately decided to get across the river. Luckily, there was a boat by the river bank, just where the guys were standing. We know that the boat can hold people with the total weight of at most k kilograms.Greg immediately took a piece of paper and listed there the weights of all people in his group (including himself). It turned out that each person weights either 50 or 100 kilograms. Now Greg wants to know what minimum number of times the boat needs to cross the river to transport the whole group to the other bank. The boat needs at least one person to navigate it from one bank to the other. As the boat crosses the river, it can have any non-zero number of passengers as long as their total weight doesn't exceed k.Also Greg is wondering, how many ways there are to transport everybody to the other side in the minimum number of boat rides. Two ways are considered distinct if during some ride they have distinct sets of people on the boat.Help Greg with this problem. ", "input_spec": "The first line contains two integers n, k (1\u2009\u2264\u2009n\u2009\u2264\u200950,\u20091\u2009\u2264\u2009k\u2009\u2264\u20095000) \u2014 the number of people, including Greg, and the boat's weight limit. The next line contains n integers \u2014 the people's weights. A person's weight is either 50 kilos or 100 kilos. You can consider Greg and his friends indexed in some way.", "output_spec": "In the first line print an integer \u2014 the minimum number of rides. If transporting everyone to the other bank is impossible, print an integer -1. In the second line print the remainder after dividing the number of ways to transport the people in the minimum number of rides by number 1000000007 (109\u2009+\u20097). If transporting everyone to the other bank is impossible, print integer 0.", "sample_inputs": ["1 50\n50", "3 100\n50 50 100", "2 50\n50 50"], "sample_outputs": ["1\n1", "5\n2", "-1\n0"], "notes": "NoteIn the first test Greg walks alone and consequently, he needs only one ride across the river.In the second test you should follow the plan:  transport two 50 kg. people;  transport one 50 kg. person back;  transport one 100 kg. person;  transport one 50 kg. person back;  transport two 50 kg. people. That totals to 5 rides. Depending on which person to choose at step 2, we can get two distinct ways."}, "src_uid": "ebb0323a854e19794c79ab559792a1f7"}
{"nl": {"description": "There have recently been elections in the zoo. Overall there were 7 main political parties: one of them is the Little Elephant Political Party, 6 other parties have less catchy names.Political parties find their number in the ballot highly important. Overall there are m possible numbers: 1,\u20092,\u2009...,\u2009m. Each of these 7 parties is going to be assigned in some way to exactly one number, at that, two distinct parties cannot receive the same number.The Little Elephant Political Party members believe in the lucky digits 4 and 7. They want to evaluate their chances in the elections. For that, they need to find out, how many correct assignments are there, such that the number of lucky digits in the Little Elephant Political Party ballot number is strictly larger than the total number of lucky digits in the ballot numbers of 6 other parties. Help the Little Elephant Political Party, calculate this number. As the answer can be rather large, print the remainder from dividing it by 1000000007 (109\u2009+\u20097).", "input_spec": "A single line contains a single positive integer m (7\u2009\u2264\u2009m\u2009\u2264\u2009109) \u2014 the number of possible numbers in the ballot.", "output_spec": "In a single line print a single integer \u2014 the answer to the problem modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["7", "8"], "sample_outputs": ["0", "1440"], "notes": null}, "src_uid": "656ed7b1b80de84d65a253e5d14d62a9"}
{"nl": {"description": "A famous Berland's painter Kalevitch likes to shock the public. One of his last obsessions is chess. For more than a thousand years people have been playing this old game on uninteresting, monotonous boards. Kalevitch decided to put an end to this tradition and to introduce a new attitude to chessboards.As before, the chessboard is a square-checkered board with the squares arranged in a 8\u2009\u00d7\u20098 grid, each square is painted black or white. Kalevitch suggests that chessboards should be painted in the following manner: there should be chosen a horizontal or a vertical line of 8 squares (i.e. a row or a column), and painted black. Initially the whole chessboard is white, and it can be painted in the above described way one or more times. It is allowed to paint a square many times, but after the first time it does not change its colour any more and remains black. Kalevitch paints chessboards neatly, and it is impossible to judge by an individual square if it was painted with a vertical or a horizontal stroke.Kalevitch hopes that such chessboards will gain popularity, and he will be commissioned to paint chessboards, which will help him ensure a comfortable old age. The clients will inform him what chessboard they want to have, and the painter will paint a white chessboard meeting the client's requirements.It goes without saying that in such business one should economize on everything \u2014 for each commission he wants to know the minimum amount of strokes that he has to paint to fulfill the client's needs. You are asked to help Kalevitch with this task.", "input_spec": "The input file contains 8 lines, each of the lines contains 8 characters. The given matrix describes the client's requirements, W character stands for a white square, and B character \u2014 for a square painted black. It is guaranteed that client's requirments can be fulfilled with a sequence of allowed strokes (vertical/column or horizontal/row).", "output_spec": "Output the only number \u2014 the minimum amount of rows and columns that Kalevitch has to paint on the white chessboard to meet the client's requirements.", "sample_inputs": ["WWWBWWBW\nBBBBBBBB\nWWWBWWBW\nWWWBWWBW\nWWWBWWBW\nWWWBWWBW\nWWWBWWBW\nWWWBWWBW", "WWWWWWWW\nBBBBBBBB\nWWWWWWWW\nWWWWWWWW\nWWWWWWWW\nWWWWWWWW\nWWWWWWWW\nWWWWWWWW"], "sample_outputs": ["3", "1"], "notes": null}, "src_uid": "8b6ae2190413b23f47e2958a7d4e7bc0"}
{"nl": {"description": "Your friend recently gave you some slimes for your birthday. You have n slimes all initially with value 1.You are going to play a game with these slimes. Initially, you put a single slime by itself in a row. Then, you will add the other n\u2009-\u20091 slimes one by one. When you add a slime, you place it at the right of all already placed slimes. Then, while the last two slimes in the row have the same value v, you combine them together to create a slime with value v\u2009+\u20091.You would like to see what the final state of the row is after you've added all n slimes. Please print the values of the slimes in the row from left to right.", "input_spec": "The first line of the input will contain a single integer, n (1\u2009\u2264\u2009n\u2009\u2264\u2009100\u2009000).", "output_spec": "Output a single line with k integers, where k is the number of slimes in the row after you've finished the procedure described in the problem statement. The i-th of these numbers should be the value of the i-th slime from the left.", "sample_inputs": ["1", "2", "3", "8"], "sample_outputs": ["1", "2", "2 1", "4"], "notes": "NoteIn the first sample, we only have a single slime with value 1. The final state of the board is just a single slime with value 1.In the second sample, we perform the following steps:Initially we place a single slime in a row by itself. Thus, row is initially 1.Then, we will add another slime. The row is now 1 1. Since two rightmost slimes have the same values, we should replace these slimes with one with value 2. Thus, the final state of the board is 2.In the third sample, after adding the first two slimes, our row is 2. After adding one more slime, the row becomes 2 1.In the last sample, the steps look as follows:   1  2  2 1  3  3 1  3 2  3 2 1  4 "}, "src_uid": "757cd804aba01dc4bc108cb0722f68dc"}
{"nl": {"description": "Little penguin Polo loves his home village. The village has n houses, indexed by integers from 1 to n. Each house has a plaque containing an integer, the i-th house has a plaque containing integer pi (1\u2009\u2264\u2009pi\u2009\u2264\u2009n).Little penguin Polo loves walking around this village. The walk looks like that. First he stands by a house number x. Then he goes to the house whose number is written on the plaque of house x (that is, to house px), then he goes to the house whose number is written on the plaque of house px (that is, to house ppx), and so on.We know that:  When the penguin starts walking from any house indexed from 1 to k, inclusive, he can walk to house number 1.  When the penguin starts walking from any house indexed from k\u2009+\u20091 to n, inclusive, he definitely cannot walk to house number 1.  When the penguin starts walking from house number 1, he can get back to house number 1 after some non-zero number of walks from a house to a house. You need to find the number of ways you may write the numbers on the houses' plaques so as to fulfill the three above described conditions. Print the remainder after dividing this number by 1000000007 (109\u2009+\u20097).", "input_spec": "The single line contains two space-separated integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u20091000,\u20091\u2009\u2264\u2009k\u2009\u2264\u2009min(8,\u2009n)) \u2014 the number of the houses and the number k from the statement.", "output_spec": "In a single line print a single integer \u2014 the answer to the problem modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["5 2", "7 4"], "sample_outputs": ["54", "1728"], "notes": null}, "src_uid": "cc838bc14408f14f984a349fea9e9694"}
{"nl": {"description": "Two chess pieces, a rook and a knight, stand on a standard chessboard 8\u2009\u00d7\u20098 in size. The positions in which they are situated are known. It is guaranteed that none of them beats the other one.Your task is to find the number of ways to place another knight on the board so that none of the three pieces on the board beat another one. A new piece can only be placed on an empty square.", "input_spec": "The first input line contains the description of the rook's position on the board. This description is a line which is 2 in length. Its first symbol is a lower-case Latin letter from a to h, and its second symbol is a number from 1 to 8. The second line contains the description of the knight's position in a similar way. It is guaranteed that their positions do not coincide.", "output_spec": "Print a single number which is the required number of ways.", "sample_inputs": ["a1\nb2", "a8\nd4"], "sample_outputs": ["44", "38"], "notes": null}, "src_uid": "073023c6b72ce923df2afd6130719cfc"}
{"nl": {"description": "There is the faculty of Computer Science in Berland. In the social net \"TheContact!\" for each course of this faculty there is the special group whose name equals the year of university entrance of corresponding course of students at the university. Each of students joins the group of his course and joins all groups for which the year of student's university entrance differs by no more than x from the year of university entrance of this student, where x \u2014 some non-negative integer. A value x is not given, but it can be uniquely determined from the available data. Note that students don't join other groups. You are given the list of groups which the student Igor joined. According to this information you need to determine the year of Igor's university entrance.", "input_spec": "The first line contains the positive odd integer n (1\u2009\u2264\u2009n\u2009\u2264\u20095) \u2014 the number of groups which Igor joined.  The next line contains n distinct integers a1,\u2009a2,\u2009...,\u2009an (2010\u2009\u2264\u2009ai\u2009\u2264\u20092100) \u2014 years of student's university entrance for each group in which Igor is the member. It is guaranteed that the input data is correct and the answer always exists. Groups are given randomly.", "output_spec": "Print the year of Igor's university entrance. ", "sample_inputs": ["3\n2014 2016 2015", "1\n2050"], "sample_outputs": ["2015", "2050"], "notes": "NoteIn the first test the value x\u2009=\u20091. Igor entered the university in 2015. So he joined groups members of which are students who entered the university in 2014, 2015 and 2016.In the second test the value x\u2009=\u20090. Igor entered only the group which corresponds to the year of his university entrance. "}, "src_uid": "f03773118cca29ff8d5b4281d39e7c63"}
{"nl": {"description": "Ehab is interested in the bitwise-xor operation and the special graphs. Mahmoud gave him a problem that combines both. He has a complete graph consisting of n vertices numbered from 0 to n\u2009-\u20091. For all 0\u2009\u2264\u2009u\u2009<\u2009v\u2009<\u2009n, vertex u and vertex v are connected with an undirected edge that has weight  (where  is the bitwise-xor operation). Can you find the weight of the minimum spanning tree of that graph?You can read about complete graphs in https://en.wikipedia.org/wiki/Complete_graphYou can read about the minimum spanning tree in https://en.wikipedia.org/wiki/Minimum_spanning_treeThe weight of the minimum spanning tree is the sum of the weights on the edges included in it.", "input_spec": "The only line contains an integer n (2\u2009\u2264\u2009n\u2009\u2264\u20091012), the number of vertices in the graph.", "output_spec": "The only line contains an integer x, the weight of the graph's minimum spanning tree.", "sample_inputs": ["4"], "sample_outputs": ["4"], "notes": "NoteIn the first sample:  The weight of the minimum spanning tree is 1+2+1=4."}, "src_uid": "a98f0d924ea52cafe0048f213f075891"}
{"nl": {"description": "Arpa is researching the Mexican wave.There are n spectators in the stadium, labeled from 1 to n. They start the Mexican wave at time 0.   At time 1, the first spectator stands.  At time 2, the second spectator stands.  ...  At time k, the k-th spectator stands.  At time k\u2009+\u20091, the (k\u2009+\u20091)-th spectator stands and the first spectator sits.  At time k\u2009+\u20092, the (k\u2009+\u20092)-th spectator stands and the second spectator sits.  ...  At time n, the n-th spectator stands and the (n\u2009-\u2009k)-th spectator sits.  At time n\u2009+\u20091, the (n\u2009+\u20091\u2009-\u2009k)-th spectator sits.  ...  At time n\u2009+\u2009k, the n-th spectator sits. Arpa wants to know how many spectators are standing at time t.", "input_spec": "The first line contains three integers n, k, t (1\u2009\u2264\u2009n\u2009\u2264\u2009109, 1\u2009\u2264\u2009k\u2009\u2264\u2009n, 1\u2009\u2264\u2009t\u2009<\u2009n\u2009+\u2009k).", "output_spec": "Print single integer: how many spectators are standing at time t.", "sample_inputs": ["10 5 3", "10 5 7", "10 5 12"], "sample_outputs": ["3", "5", "3"], "notes": "NoteIn the following a sitting spectator is represented as -, a standing spectator is represented as ^.  At t\u2009=\u20090\u2002 ----------  number of standing spectators = 0.  At t\u2009=\u20091\u2002 ^---------  number of standing spectators = 1.  At t\u2009=\u20092\u2002 ^^--------  number of standing spectators = 2.  At t\u2009=\u20093\u2002 ^^^-------  number of standing spectators = 3.  At t\u2009=\u20094\u2002 ^^^^------  number of standing spectators = 4.  At t\u2009=\u20095\u2002 ^^^^^-----  number of standing spectators = 5.  At t\u2009=\u20096\u2002 -^^^^^----  number of standing spectators = 5.  At t\u2009=\u20097\u2002 --^^^^^---  number of standing spectators = 5.  At t\u2009=\u20098\u2002 ---^^^^^--  number of standing spectators = 5.  At t\u2009=\u20099\u2002 ----^^^^^-  number of standing spectators = 5.  At t\u2009=\u200910 -----^^^^^  number of standing spectators = 5.  At t\u2009=\u200911 ------^^^^  number of standing spectators = 4.  At t\u2009=\u200912 -------^^^  number of standing spectators = 3.  At t\u2009=\u200913 --------^^  number of standing spectators = 2.  At t\u2009=\u200914 ---------^  number of standing spectators = 1.  At t\u2009=\u200915 ----------  number of standing spectators = 0. "}, "src_uid": "7e614526109a2052bfe7934381e7f6c2"}
{"nl": {"description": "\"Multidimensional spaces are completely out of style these days, unlike genetics problems\" \u2014 thought physicist Woll and changed his subject of study to bioinformatics. Analysing results of sequencing he faced the following problem concerning DNA sequences. We will further think of a DNA sequence as an arbitrary string of uppercase letters \"A\", \"C\", \"G\" and \"T\" (of course, this is a simplified interpretation).Let w be a long DNA sequence and s1,\u2009s2,\u2009...,\u2009sm \u2014 collection of short DNA sequences. Let us say that the collection filters w iff w can be covered with the sequences from the collection. Certainly, substrings corresponding to the different positions of the string may intersect or even cover each other. More formally: denote by |w| the length of w, let symbols of w be numbered from 1 to |w|. Then for each position i in w there exist pair of indices l,\u2009r (1\u2009\u2264\u2009l\u2009\u2264\u2009i\u2009\u2264\u2009r\u2009\u2264\u2009|w|) such that the substring w[l\u00a0...\u00a0r] equals one of the elements s1,\u2009s2,\u2009...,\u2009sm of the collection.Woll wants to calculate the number of DNA sequences of a given length filtered by a given collection, but he doesn't know how to deal with it. Help him! Your task is to find the number of different DNA sequences of length n filtered by the collection {si}.Answer may appear very large, so output it modulo 1000000009.", "input_spec": "First line contains two integer numbers n and m (1\u2009\u2264\u2009n\u2009\u2264\u20091000,\u20091\u2009\u2264\u2009m\u2009\u2264\u200910) \u2014 the length of the string and the number of sequences in the collection correspondently.  Next m lines contain the collection sequences si, one per line. Each si is a nonempty string of length not greater than 10. All the strings consist of uppercase letters \"A\", \"C\", \"G\", \"T\". The collection may contain identical strings.", "output_spec": "Output should contain a single integer \u2014 the number of strings filtered by the collection modulo 1000000009 (109\u2009+\u20099).", "sample_inputs": ["2 1\nA", "6 2\nCAT\nTACT"], "sample_outputs": ["1", "2"], "notes": "NoteIn the first sample, a string has to be filtered by \"A\". Clearly, there is only one such string: \"AA\".In the second sample, there exist exactly two different strings satisfying the condition (see the pictures below).    "}, "src_uid": "3f053c07deaac55c2c51df6147080340"}
{"nl": {"description": "As technologies develop, manufacturers are making the process of unlocking a phone as user-friendly as possible. To unlock its new phone, Arkady's pet dog Mu-mu has to bark the password once. The phone represents a password as a string of two lowercase English letters.Mu-mu's enemy Kashtanka wants to unlock Mu-mu's phone to steal some sensible information, but it can only bark n distinct words, each of which can be represented as a string of two lowercase English letters. Kashtanka wants to bark several words (not necessarily distinct) one after another to pronounce a string containing the password as a substring. Tell if it's possible to unlock the phone in this way, or not.", "input_spec": "The first line contains two lowercase English letters\u00a0\u2014 the password on the phone. The second line contains single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of words Kashtanka knows. The next n lines contain two lowercase English letters each, representing the words Kashtanka knows. The words are guaranteed to be distinct.", "output_spec": "Print \"YES\" if Kashtanka can bark several words in a line forming a string containing the password, and \"NO\" otherwise. You can print each letter in arbitrary case (upper or lower).", "sample_inputs": ["ya\n4\nah\noy\nto\nha", "hp\n2\nht\ntp", "ah\n1\nha"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteIn the first example the password is \"ya\", and Kashtanka can bark \"oy\" and then \"ah\", and then \"ha\" to form the string \"oyahha\" which contains the password. So, the answer is \"YES\".In the second example Kashtanka can't produce a string containing password as a substring. Note that it can bark \"ht\" and then \"tp\" producing \"http\", but it doesn't contain the password \"hp\" as a substring.In the third example the string \"hahahaha\" contains \"ah\" as a substring."}, "src_uid": "cad8283914da16bc41680857bd20fe9f"}
{"nl": {"description": "You have $$$n$$$ coins, each of the same value of $$$1$$$.Distribute them into packets such that any amount $$$x$$$ ($$$1 \\leq x \\leq n$$$) can be formed using some (possibly one or all) number of these packets.Each packet may only be used entirely or not used at all. No packet may be used more than once in the formation of the single $$$x$$$, however it may be reused for the formation of other $$$x$$$'s.Find the minimum number of packets in such a distribution.", "input_spec": "The only line contains a single integer $$$n$$$ ($$$1 \\leq n \\leq 10^9$$$)\u00a0\u2014 the number of coins you have.", "output_spec": "Output a single integer\u00a0\u2014 the minimum possible number of packets, satisfying the condition above.", "sample_inputs": ["6", "2"], "sample_outputs": ["3", "2"], "notes": "NoteIn the first example, three packets with $$$1$$$, $$$2$$$ and $$$3$$$ coins can be made to get any amount $$$x$$$ ($$$1\\leq x\\leq 6$$$).  To get $$$1$$$ use the packet with $$$1$$$ coin.  To get $$$2$$$ use the packet with $$$2$$$ coins.  To get $$$3$$$ use the packet with $$$3$$$ coins.  To get $$$4$$$ use packets with $$$1$$$ and $$$3$$$ coins.  To get $$$5$$$ use packets with $$$2$$$ and $$$3$$$ coins  To get $$$6$$$ use all packets. In the second example, two packets with $$$1$$$ and $$$1$$$ coins can be made to get any amount $$$x$$$ ($$$1\\leq x\\leq 2$$$)."}, "src_uid": "95cb79597443461085e62d974d67a9a0"}
{"nl": {"description": "Capitalization is writing a word with its first letter as a capital letter. Your task is to capitalize the given word.Note, that during capitalization all the letters except the first one remains unchanged.", "input_spec": "A single line contains a non-empty word. This word consists of lowercase and uppercase English letters. The length of the word will not exceed 103.", "output_spec": "Output the given word after capitalization.", "sample_inputs": ["ApPLe", "konjac"], "sample_outputs": ["ApPLe", "Konjac"], "notes": null}, "src_uid": "29e0fc0c5c0e136ac8e58011c91397e4"}
{"nl": {"description": "Neko loves divisors. During the latest number theory lesson, he got an interesting exercise from his math teacher.Neko has two integers $$$a$$$ and $$$b$$$. His goal is to find a non-negative integer $$$k$$$ such that the least common multiple of $$$a+k$$$ and $$$b+k$$$ is the smallest possible. If there are multiple optimal integers $$$k$$$, he needs to choose the smallest one.Given his mathematical talent, Neko had no trouble getting Wrong Answer on this problem. Can you help him solve it?", "input_spec": "The only line contains two integers $$$a$$$ and $$$b$$$ ($$$1 \\le a, b \\le 10^9$$$).", "output_spec": "Print the smallest non-negative integer $$$k$$$ ($$$k \\ge 0$$$) such that the lowest common multiple of $$$a+k$$$ and $$$b+k$$$ is the smallest possible. If there are many possible integers $$$k$$$ giving the same value of the least common multiple, print the smallest one.", "sample_inputs": ["6 10", "21 31", "5 10"], "sample_outputs": ["2", "9", "0"], "notes": "NoteIn the first test, one should choose $$$k = 2$$$, as the least common multiple of $$$6 + 2$$$ and $$$10 + 2$$$ is $$$24$$$, which is the smallest least common multiple possible."}, "src_uid": "414149fadebe25ab6097fc67663177c3"}
{"nl": {"description": "Vadim is really keen on travelling. Recently he heard about kayaking activity near his town and became very excited about it, so he joined a party of kayakers.Now the party is ready to start its journey, but firstly they have to choose kayaks. There are 2\u00b7n people in the group (including Vadim), and they have exactly n\u2009-\u20091 tandem kayaks (each of which, obviously, can carry two people) and 2 single kayaks. i-th person's weight is wi, and weight is an important matter in kayaking \u2014 if the difference between the weights of two people that sit in the same tandem kayak is too large, then it can crash. And, of course, people want to distribute their seats in kayaks in order to minimize the chances that kayaks will crash.Formally, the instability of a single kayak is always 0, and the instability of a tandem kayak is the absolute difference between weights of the people that are in this kayak. Instability of the whole journey is the total instability of all kayaks.Help the party to determine minimum possible total instability! ", "input_spec": "The first line contains one number n (2\u2009\u2264\u2009n\u2009\u2264\u200950). The second line contains 2\u00b7n integer numbers w1, w2, ..., w2n, where wi is weight of person i (1\u2009\u2264\u2009wi\u2009\u2264\u20091000).", "output_spec": "Print minimum possible total instability.", "sample_inputs": ["2\n1 2 3 4", "4\n1 3 4 6 3 4 100 200"], "sample_outputs": ["1", "5"], "notes": null}, "src_uid": "76659c0b7134416452585c391daadb16"}
{"nl": {"description": "One Sunday Petr went to a bookshop and bought a new book on sports programming. The book had exactly n pages.Petr decided to start reading it starting from the next day, that is, from Monday. Petr's got a very tight schedule and for each day of the week he knows how many pages he will be able to read on that day. Some days are so busy that Petr will have no time to read whatsoever. However, we know that he will be able to read at least one page a week.Assuming that Petr will not skip days and will read as much as he can every day, determine on which day of the week he will read the last page of the book.", "input_spec": "The first input line contains the single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091000) \u2014 the number of pages in the book. The second line contains seven non-negative space-separated integers that do not exceed 1000 \u2014 those integers represent how many pages Petr can read on Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday correspondingly. It is guaranteed that at least one of those numbers is larger than zero.", "output_spec": "Print a single number \u2014 the number of the day of the week, when Petr will finish reading the book. The days of the week are numbered starting with one in the natural order: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.", "sample_inputs": ["100\n15 20 20 15 10 30 45", "2\n1 0 0 0 0 0 0"], "sample_outputs": ["6", "1"], "notes": "NoteNote to the first sample:By the end of Monday and therefore, by the beginning of Tuesday Petr has 85 pages left. He has 65 pages left by Wednesday, 45 by Thursday, 30 by Friday, 20 by Saturday and on Saturday Petr finishes reading the book (and he also has time to read 10 pages of something else).Note to the second sample:On Monday of the first week Petr will read the first page. On Monday of the second week Petr will read the second page and will finish reading the book."}, "src_uid": "007a779d966e2e9219789d6d9da7002c"}
{"nl": {"description": "A permutation of length $$$n$$$ is an array consisting of $$$n$$$ distinct integers from $$$1$$$ to $$$n$$$ in arbitrary order. For example, $$$[2,3,1,5,4]$$$ is a permutation, but $$$[1,2,2]$$$ is not a permutation ($$$2$$$ appears twice in the array) and $$$[1,3,4]$$$ is also not a permutation ($$$n=3$$$ but there is $$$4$$$ in the array).Consider a permutation $$$p$$$ of length $$$n$$$, we build a graph of size $$$n$$$ using it as follows:   For every $$$1 \\leq i \\leq n$$$, find the largest $$$j$$$ such that $$$1 \\leq j < i$$$ and $$$p_j > p_i$$$, and add an undirected edge between node $$$i$$$ and node $$$j$$$  For every $$$1 \\leq i \\leq n$$$, find the smallest $$$j$$$ such that $$$i < j \\leq n$$$ and $$$p_j > p_i$$$, and add an undirected edge between node $$$i$$$ and node $$$j$$$ In cases where no such $$$j$$$ exists, we make no edges. Also, note that we make edges between the corresponding indices, not the values at those indices.For clarity, consider as an example $$$n = 4$$$, and $$$p = [3,1,4,2]$$$; here, the edges of the graph are $$$(1,3),(2,1),(2,3),(4,3)$$$.A permutation $$$p$$$ is cyclic if the graph built using $$$p$$$ has at least one simple cycle. Given $$$n$$$, find the number of cyclic permutations of length $$$n$$$. Since the number may be very large, output it modulo $$$10^9+7$$$.Please refer to the Notes section for the formal definition of a simple cycle", "input_spec": "The first and only line contains a single integer $$$n$$$ ($$$3 \\le n \\le 10^6$$$).", "output_spec": "Output a single integer $$$0 \\leq x < 10^9+7$$$, the number of cyclic permutations of length $$$n$$$ modulo $$$10^9+7$$$.", "sample_inputs": ["4", "583291"], "sample_outputs": ["16", "135712853"], "notes": "NoteThere are $$$16$$$ cyclic permutations for $$$n = 4$$$. $$$[4,2,1,3]$$$ is one such permutation, having a cycle of length four: $$$4 \\rightarrow 3 \\rightarrow 2 \\rightarrow 1 \\rightarrow 4$$$.Nodes $$$v_1$$$, $$$v_2$$$, $$$\\ldots$$$, $$$v_k$$$ form a simple cycle if the following conditions hold:   $$$k \\geq 3$$$.  $$$v_i \\neq v_j$$$ for any pair of indices $$$i$$$ and $$$j$$$. ($$$1 \\leq i < j \\leq k$$$)  $$$v_i$$$ and $$$v_{i+1}$$$ share an edge for all $$$i$$$ ($$$1 \\leq i < k$$$), and $$$v_1$$$ and $$$v_k$$$ share an edge. "}, "src_uid": "3dc1ee09016a25421ae371fa8005fce1"}
{"nl": {"description": "You are given a positive integer $$$n$$$, written without leading zeroes (for example, the number 04 is incorrect). In one operation you can delete any digit of the given integer so that the result remains a positive integer without leading zeros.Determine the minimum number of operations that you need to consistently apply to the given integer $$$n$$$ to make from it the square of some positive integer or report that it is impossible.An integer $$$x$$$ is the square of some positive integer if and only if $$$x=y^2$$$ for some positive integer $$$y$$$.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 2 \\cdot 10^{9}$$$). The number is given without leading zeroes.", "output_spec": "If it is impossible to make the square of some positive integer from $$$n$$$, print -1. In the other case, print the minimal number of operations required to do it.", "sample_inputs": ["8314", "625", "333"], "sample_outputs": ["2", "0", "-1"], "notes": "NoteIn the first example we should delete from $$$8314$$$ the digits $$$3$$$ and $$$4$$$. After that $$$8314$$$ become equals to $$$81$$$, which is the square of the integer $$$9$$$.In the second example the given $$$625$$$ is the square of the integer $$$25$$$, so you should not delete anything. In the third example it is impossible to make the square from $$$333$$$, so the answer is -1."}, "src_uid": "fa4b1de79708329bb85437e1413e13df"}
{"nl": {"description": "You are given three integers $$$a$$$, $$$b$$$ and $$$x$$$. Your task is to construct a binary string $$$s$$$ of length $$$n = a + b$$$ such that there are exactly $$$a$$$ zeroes, exactly $$$b$$$ ones and exactly $$$x$$$ indices $$$i$$$ (where $$$1 \\le i < n$$$) such that $$$s_i \\ne s_{i + 1}$$$. It is guaranteed that the answer always exists.For example, for the string \"01010\" there are four indices $$$i$$$ such that $$$1 \\le i < n$$$ and $$$s_i \\ne s_{i + 1}$$$ ($$$i = 1, 2, 3, 4$$$). For the string \"111001\" there are two such indices $$$i$$$ ($$$i = 3, 5$$$).Recall that binary string is a non-empty sequence of characters where each character is either 0 or 1.", "input_spec": "The first line of the input contains three integers $$$a$$$, $$$b$$$ and $$$x$$$ ($$$1 \\le a, b \\le 100, 1 \\le x < a + b)$$$.", "output_spec": "Print only one string $$$s$$$, where $$$s$$$ is any binary string satisfying conditions described above. It is guaranteed that the answer always exists.", "sample_inputs": ["2 2 1", "3 3 3", "5 3 6"], "sample_outputs": ["1100", "101100", "01010100"], "notes": "NoteAll possible answers for the first example:   1100;  0011. All possible answers for the second example:   110100;  101100;  110010;  100110;  011001;  001101;  010011;  001011. "}, "src_uid": "ef4123b8f3f3b511fde8b79ea9a6b20c"}
{"nl": {"description": "Fox Ciel is playing a game with numbers now. Ciel has n positive integers: x1, x2, ..., xn. She can do the following operation as many times as needed: select two different indexes i and j such that xi > xj hold, and then apply assignment xi = xi - xj. The goal is to make the sum of all numbers as small as possible.Please help Ciel to find this minimal sum.", "input_spec": "The first line contains an integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100). Then the second line contains n integers: x1, x2, ..., xn (1\u2009\u2264\u2009xi\u2009\u2264\u2009100).", "output_spec": "Output a single integer \u2014 the required minimal sum.", "sample_inputs": ["2\n1 2", "3\n2 4 6", "2\n12 18", "5\n45 12 27 30 18"], "sample_outputs": ["2", "6", "12", "15"], "notes": "NoteIn the first example the optimal way is to do the assignment: x2 = x2 - x1.In the second example the optimal sequence of operations is: x3 = x3 - x2, x2 = x2 - x1."}, "src_uid": "042cf938dc4a0f46ff33d47b97dc6ad4"}
{"nl": {"description": "You are given n distinct points on a plane with integral coordinates. For each point you can either draw a vertical line through it, draw a horizontal line through it, or do nothing.You consider several coinciding straight lines as a single one. How many distinct pictures you can get? Print the answer modulo 109\u2009+\u20097.", "input_spec": "The first line contains single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009105)\u00a0\u2014 the number of points. n lines follow. The (i\u2009+\u20091)-th of these lines contains two integers xi, yi (\u2009-\u2009109\u2009\u2264\u2009xi,\u2009yi\u2009\u2264\u2009109)\u00a0\u2014 coordinates of the i-th point. It is guaranteed that all points are distinct.", "output_spec": "Print the number of possible distinct pictures modulo 109\u2009+\u20097.", "sample_inputs": ["4\n1 1\n1 2\n2 1\n2 2", "2\n-1 -1\n0 1"], "sample_outputs": ["16", "9"], "notes": "NoteIn the first example there are two vertical and two horizontal lines passing through the points. You can get pictures with any subset of these lines. For example, you can get the picture containing all four lines in two ways (each segment represents a line containing it). The first way:      The second way:      In the second example you can work with two points independently. The number of pictures is 32\u2009=\u20099."}, "src_uid": "8781003d9eea51a509145bc6db8b609c"}
{"nl": {"description": "To make a paper airplane, one has to use a rectangular piece of paper. From a sheet of standard size you can make $$$s$$$ airplanes.A group of $$$k$$$ people decided to make $$$n$$$ airplanes each. They are going to buy several packs of paper, each of them containing $$$p$$$ sheets, and then distribute the sheets between the people. Each person should have enough sheets to make $$$n$$$ airplanes. How many packs should they buy?", "input_spec": "The only line contains four integers $$$k$$$, $$$n$$$, $$$s$$$, $$$p$$$ ($$$1 \\le k, n, s, p \\le 10^4$$$)\u00a0\u2014 the number of people, the number of airplanes each should make, the number of airplanes that can be made using one sheet and the number of sheets in one pack, respectively.", "output_spec": "Print a single integer\u00a0\u2014 the minimum number of packs they should buy.", "sample_inputs": ["5 3 2 3", "5 3 100 1"], "sample_outputs": ["4", "5"], "notes": "NoteIn the first sample they have to buy $$$4$$$ packs of paper: there will be $$$12$$$ sheets in total, and giving $$$2$$$ sheets to each person is enough to suit everyone's needs.In the second sample they have to buy a pack for each person as they can't share sheets."}, "src_uid": "73f0c7cfc06a9b04e4766d6aa61fc780"}
{"nl": {"description": "Johnny has a younger sister Anne, who is very clever and smart. As she came home from the kindergarten, she told his brother about the task that her kindergartener asked her to solve. The task was just to construct a triangle out of four sticks of different colours. Naturally, one of the sticks is extra. It is not allowed to break the sticks or use their partial length. Anne has perfectly solved this task, now she is asking Johnny to do the same.The boy answered that he would cope with it without any difficulty. However, after a while he found out that different tricky things can occur. It can happen that it is impossible to construct a triangle of a positive area, but it is possible to construct a degenerate triangle. It can be so, that it is impossible to construct a degenerate triangle even. As Johnny is very lazy, he does not want to consider such a big amount of cases, he asks you to help him.", "input_spec": "The first line of the input contains four space-separated positive integer numbers not exceeding 100 \u2014 lengthes of the sticks.", "output_spec": "Output TRIANGLE if it is possible to construct a non-degenerate triangle. Output SEGMENT if the first case cannot take place and it is possible to construct a degenerate triangle. Output IMPOSSIBLE if it is impossible to construct any triangle. Remember that you are to use three sticks. It is not allowed to break the sticks or use their partial length.", "sample_inputs": ["4 2 1 3", "7 2 2 4", "3 5 9 1"], "sample_outputs": ["TRIANGLE", "SEGMENT", "IMPOSSIBLE"], "notes": null}, "src_uid": "8f5df9a41e6e100aa65b9fc1d26e447a"}
{"nl": {"description": "Memory and his friend Lexa are competing to get higher score in one popular computer game. Memory starts with score a and Lexa starts with score b. In a single turn, both Memory and Lexa get some integer in the range [\u2009-\u2009k;k] (i.e. one integer among \u2009-\u2009k,\u2009\u2009-\u2009k\u2009+\u20091,\u2009\u2009-\u2009k\u2009+\u20092,\u2009...,\u2009\u2009-\u20092,\u2009\u2009-\u20091,\u20090,\u20091,\u20092,\u2009...,\u2009k\u2009-\u20091,\u2009k) and add them to their current scores. The game has exactly t turns. Memory and Lexa, however, are not good at this game, so they both always get a random integer at their turn.Memory wonders how many possible games exist such that he ends with a strictly higher score than Lexa. Two games are considered to be different if in at least one turn at least one player gets different score. There are (2k\u2009+\u20091)2t games in total. Since the answer can be very large, you should print it modulo 109\u2009+\u20097. Please solve this problem for Memory.", "input_spec": "The first and only line of input contains the four integers a, b, k, and t (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009100, 1\u2009\u2264\u2009k\u2009\u2264\u20091000, 1\u2009\u2264\u2009t\u2009\u2264\u2009100)\u00a0\u2014 the amount Memory and Lexa start with, the number k, and the number of turns respectively.", "output_spec": "Print the number of possible games satisfying the conditions modulo 1\u2009000\u2009000\u2009007 (109\u2009+\u20097) in one line.", "sample_inputs": ["1 2 2 1", "1 1 1 2", "2 12 3 1"], "sample_outputs": ["6", "31", "0"], "notes": "NoteIn the first sample test, Memory starts with 1 and Lexa starts with 2. If Lexa picks \u2009-\u20092, Memory can pick 0, 1, or 2 to win. If Lexa picks \u2009-\u20091, Memory can pick 1 or 2 to win. If Lexa picks 0, Memory can pick 2 to win. If Lexa picks 1 or 2, Memory cannot win. Thus, there are 3\u2009+\u20092\u2009+\u20091\u2009=\u20096 possible games in which Memory wins."}, "src_uid": "8b8327512a318a5b5afd531ff7223bd0"}
{"nl": {"description": "The Easter Rabbit laid n eggs in a circle and is about to paint them. Each egg should be painted one color out of 7: red, orange, yellow, green, blue, indigo or violet. Also, the following conditions should be satisfied:  Each of the seven colors should be used to paint at least one egg.  Any four eggs lying sequentially should be painted different colors. Help the Easter Rabbit paint the eggs in the required manner. We know that it is always possible.", "input_spec": "The only line contains an integer n \u2014 the amount of eggs (7\u2009\u2264\u2009n\u2009\u2264\u2009100).", "output_spec": "Print one line consisting of n characters. The i-th character should describe the color of the i-th egg in the order they lie in the circle. The colors should be represented as follows: \"R\" stands for red, \"O\" stands for orange, \"Y\" stands for yellow, \"G\" stands for green, \"B\" stands for blue, \"I\" stands for indigo, \"V\" stands for violet. If there are several answers, print any of them.", "sample_inputs": ["8", "13"], "sample_outputs": ["ROYGRBIV", "ROYGBIVGBIVYG"], "notes": "NoteThe way the eggs will be painted in the first sample is shown on the picture:   "}, "src_uid": "dc3817c71b1fa5606f316e5e94732296"}
{"nl": {"description": "Luba is surfing the Internet. She currently has n opened tabs in her browser, indexed from 1 to n from left to right. The mouse cursor is currently located at the pos-th tab. Luba needs to use the tabs with indices from l to r (inclusive) for her studies, and she wants to close all the tabs that don't belong to this segment as fast as possible.Each second Luba can either try moving the cursor to the left or to the right (if the cursor is currently at the tab i, then she can move it to the tab max(i\u2009-\u20091,\u2009a) or to the tab min(i\u2009+\u20091,\u2009b)) or try closing all the tabs to the left or to the right of the cursor (if the cursor is currently at the tab i, she can close all the tabs with indices from segment [a,\u2009i\u2009-\u20091] or from segment [i\u2009+\u20091,\u2009b]). In the aforementioned expressions a and b denote the minimum and maximum index of an unclosed tab, respectively. For example, if there were 7 tabs initially and tabs 1, 2 and 7 are closed, then a\u2009=\u20093, b\u2009=\u20096.What is the minimum number of seconds Luba has to spend in order to leave only the tabs with initial indices from l to r inclusive opened?", "input_spec": "The only line of input contains four integer numbers n, pos, l, r (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009pos\u2009\u2264\u2009n, 1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009n) \u2014 the number of the tabs, the cursor position and the segment which Luba needs to leave opened.", "output_spec": "Print one integer equal to the minimum number of seconds required to close all the tabs outside the segment [l,\u2009r].", "sample_inputs": ["6 3 2 4", "6 3 1 3", "5 2 1 5"], "sample_outputs": ["5", "1", "0"], "notes": "NoteIn the first test Luba can do the following operations: shift the mouse cursor to the tab 2, close all the tabs to the left of it, shift the mouse cursor to the tab 3, then to the tab 4, and then close all the tabs to the right of it.In the second test she only needs to close all the tabs to the right of the current position of the cursor.In the third test Luba doesn't need to do anything."}, "src_uid": "5deaac7bd3afedee9b10e61997940f78"}
{"nl": {"description": "At the beginning of the school year Berland State University starts two city school programming groups, for beginners and for intermediate coders. The children were tested in order to sort them into groups. According to the results, each student got some score from 1 to m points. We know that c1 schoolchildren got 1 point, c2 children got 2 points, ..., cm children got m points. Now you need to set the passing rate k (integer from 1 to m): all schoolchildren who got less than k points go to the beginner group and those who get at strictly least k points go to the intermediate group. We know that if the size of a group is more than y, then the university won't find a room for them. We also know that if a group has less than x schoolchildren, then it is too small and there's no point in having classes with it. So, you need to split all schoolchildren into two groups so that the size of each group was from x to y, inclusive. Help the university pick the passing rate in a way that meets these requirements.", "input_spec": "The first line contains integer m (2\u2009\u2264\u2009m\u2009\u2264\u2009100). The second line contains m integers c1, c2, ..., cm, separated by single spaces (0\u2009\u2264\u2009ci\u2009\u2264\u2009100). The third line contains two space-separated integers x and y (1\u2009\u2264\u2009x\u2009\u2264\u2009y\u2009\u2264\u200910000). At least one ci is greater than 0.", "output_spec": "If it is impossible to pick a passing rate in a way that makes the size of each resulting groups at least x and at most y, print 0. Otherwise, print an integer from 1 to m \u2014 the passing rate you'd like to suggest. If there are multiple possible answers, print any of them.", "sample_inputs": ["5\n3 4 3 2 1\n6 8", "5\n0 3 3 4 2\n3 10", "2\n2 5\n3 6"], "sample_outputs": ["3", "4", "0"], "notes": "NoteIn the first sample the beginner group has 7 students, the intermediate group has 6 of them. In the second sample another correct answer is 3."}, "src_uid": "e595a1d0c0e4bbcc99454d3148b4557b"}
{"nl": {"description": "Captain Bill the Hummingbird and his crew recieved an interesting challenge offer. Some stranger gave them a map, potion of teleportation and said that only this potion might help them to reach the treasure. Bottle with potion has two values x and y written on it. These values define four moves which can be performed using the potion:         Map shows that the position of Captain Bill the Hummingbird is (x1,\u2009y1) and the position of the treasure is (x2,\u2009y2).You task is to tell Captain Bill the Hummingbird whether he should accept this challenge or decline. If it is possible for Captain to reach the treasure using the potion then output \"YES\", otherwise \"NO\" (without quotes).The potion can be used infinite amount of times.", "input_spec": "The first line contains four integer numbers x1,\u2009y1,\u2009x2,\u2009y2 (\u2009-\u2009105\u2009\u2264\u2009x1,\u2009y1,\u2009x2,\u2009y2\u2009\u2264\u2009105) \u2014 positions of Captain Bill the Hummingbird and treasure respectively. The second line contains two integer numbers x,\u2009y (1\u2009\u2264\u2009x,\u2009y\u2009\u2264\u2009105) \u2014 values on the potion bottle.", "output_spec": "Print \"YES\" if it is possible for Captain to reach the treasure using the potion, otherwise print \"NO\" (without quotes).", "sample_inputs": ["0 0 0 6\n2 3", "1 1 3 6\n1 5"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example there exists such sequence of moves:   \u2014 the first type of move   \u2014 the third type of move "}, "src_uid": "1c80040104e06c9f24abfcfe654a851f"}
{"nl": {"description": "Polycarpus is sure that his life fits the description: \"first there is a white stripe, then a black one, then a white one again\". So, Polycarpus is sure that this rule is going to fulfill during the next n days. Polycarpus knows that he is in for w good events and b not-so-good events. At least one event is going to take place during each day. As each day is unequivocally characterizes as a part of a white or a black stripe, then each day is going to have events of the same type only (ether good or not-so-good).What is the number of distinct ways this scenario can develop over the next n days if Polycarpus is in for a white stripe (a stripe that has good events only, the stripe's length is at least 1 day), the a black stripe (a stripe that has not-so-good events only, the stripe's length is at least 1 day) and a white stripe again (a stripe that has good events only, the stripe's length is at least 1 day). Each of n days will belong to one of the three stripes only.Note that even the events of the same type are distinct from each other. Even if some events occur on the same day, they go in some order (there are no simultaneous events).Write a code that prints the number of possible configurations to sort the events into days. See the samples for clarifications on which scenarios should be considered distinct. Print the answer modulo 1000000009 (109\u2009+\u20099).", "input_spec": "The single line of the input contains integers n, w and b (3\u2009\u2264\u2009n\u2009\u2264\u20094000, 2\u2009\u2264\u2009w\u2009\u2264\u20094000, 1\u2009\u2264\u2009b\u2009\u2264\u20094000) \u2014 the number of days, the number of good events and the number of not-so-good events. It is guaranteed that w\u2009+\u2009b\u2009\u2265\u2009n.", "output_spec": "Print the required number of ways modulo 1000000009 (109\u2009+\u20099).", "sample_inputs": ["3 2 1", "4 2 2", "3 2 2"], "sample_outputs": ["2", "4", "4"], "notes": "NoteWe'll represent the good events by numbers starting from 1 and the not-so-good events \u2014 by letters starting from 'a'. Vertical lines separate days.In the first sample the possible ways are: \"1|a|2\" and \"2|a|1\". In the second sample the possible ways are: \"1|a|b|2\", \"2|a|b|1\", \"1|b|a|2\" and \"2|b|a|1\". In the third sample the possible ways are: \"1|ab|2\", \"2|ab|1\", \"1|ba|2\" and \"2|ba|1\"."}, "src_uid": "63e93a161bbff623323e66c98d5e20ac"}
{"nl": {"description": "Jzzhu has invented a kind of sequences, they meet the following property:You are given x and y, please calculate fn modulo 1000000007 (109\u2009+\u20097).", "input_spec": "The first line contains two integers x and y (|x|,\u2009|y|\u2009\u2264\u2009109). The second line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20092\u00b7109).", "output_spec": "Output a single integer representing fn modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["2 3\n3", "0 -1\n2"], "sample_outputs": ["1", "1000000006"], "notes": "NoteIn the first sample, f2\u2009=\u2009f1\u2009+\u2009f3, 3\u2009=\u20092\u2009+\u2009f3, f3\u2009=\u20091.In the second sample, f2\u2009=\u2009\u2009-\u20091; \u2009-\u20091 modulo (109\u2009+\u20097) equals (109\u2009+\u20096)."}, "src_uid": "2ff85140e3f19c90e587ce459d64338b"}
{"nl": {"description": "Nauuo is a girl who loves writing comments.One day, she posted a comment on Codeforces, wondering whether she would get upvotes or downvotes.It's known that there were $$$x$$$ persons who would upvote, $$$y$$$ persons who would downvote, and there were also another $$$z$$$ persons who would vote, but you don't know whether they would upvote or downvote. Note that each of the $$$x+y+z$$$ people would vote exactly one time.There are three different results: if there are more people upvote than downvote, the result will be \"+\"; if there are more people downvote than upvote, the result will be \"-\"; otherwise the result will be \"0\".Because of the $$$z$$$ unknown persons, the result may be uncertain (i.e. there are more than one possible results). More formally, the result is uncertain if and only if there exist two different situations of how the $$$z$$$ persons vote, that the results are different in the two situations.Tell Nauuo the result or report that the result is uncertain.", "input_spec": "The only line contains three integers $$$x$$$, $$$y$$$, $$$z$$$ ($$$0\\le x,y,z\\le100$$$), corresponding to the number of persons who would upvote, downvote or unknown.", "output_spec": "If there is only one possible result, print the result : \"+\", \"-\" or \"0\". Otherwise, print \"?\" to report that the result is uncertain.", "sample_inputs": ["3 7 0", "2 0 1", "1 1 0", "0 0 1"], "sample_outputs": ["-", "+", "0", "?"], "notes": "NoteIn the first example, Nauuo would definitely get three upvotes and seven downvotes, so the only possible result is \"-\".In the second example, no matter the person unknown downvotes or upvotes, Nauuo would get more upvotes than downvotes. So the only possible result is \"+\".In the third example, Nauuo would definitely get one upvote and one downvote, so the only possible result is \"0\".In the fourth example, if the only one person upvoted, the result would be \"+\", otherwise, the result would be \"-\". There are two possible results, so the result is uncertain."}, "src_uid": "66398694a4a142b4a4e709d059aca0fa"}
{"nl": {"description": "Alice and Bob are decorating a Christmas Tree. Alice wants only $$$3$$$ types of ornaments to be used on the Christmas Tree: yellow, blue and red. They have $$$y$$$ yellow ornaments, $$$b$$$ blue ornaments and $$$r$$$ red ornaments.In Bob's opinion, a Christmas Tree will be beautiful if:  the number of blue ornaments used is greater by exactly $$$1$$$ than the number of yellow ornaments, and  the number of red ornaments used is greater by exactly $$$1$$$ than the number of blue ornaments. That is, if they have $$$8$$$ yellow ornaments, $$$13$$$ blue ornaments and $$$9$$$ red ornaments, we can choose $$$4$$$ yellow, $$$5$$$ blue and $$$6$$$ red ornaments ($$$5=4+1$$$ and $$$6=5+1$$$).Alice wants to choose as many ornaments as possible, but she also wants the Christmas Tree to be beautiful according to Bob's opinion.In the example two paragraphs above, we would choose $$$7$$$ yellow, $$$8$$$ blue and $$$9$$$ red ornaments. If we do it, we will use $$$7+8+9=24$$$ ornaments. That is the maximum number.Since Alice and Bob are busy with preparing food to the New Year's Eve, they are asking you to find out the maximum number of ornaments that can be used in their beautiful Christmas Tree! It is guaranteed that it is possible to choose at least $$$6$$$ ($$$1+2+3=6$$$) ornaments.", "input_spec": "The only line contains three integers $$$y$$$, $$$b$$$, $$$r$$$ ($$$1 \\leq y \\leq 100$$$, $$$2 \\leq b \\leq 100$$$, $$$3 \\leq r \\leq 100$$$)\u00a0\u2014 the number of yellow, blue and red ornaments.  It is guaranteed that it is possible to choose at least $$$6$$$ ($$$1+2+3=6$$$) ornaments.", "output_spec": "Print one number\u00a0\u2014 the maximum number of ornaments that can be used. ", "sample_inputs": ["8 13 9", "13 3 6"], "sample_outputs": ["24", "9"], "notes": "NoteIn the first example, the answer is $$$7+8+9=24$$$.In the second example, the answer is $$$2+3+4=9$$$."}, "src_uid": "03ac8efe10de17590e1ae151a7bae1a5"}
{"nl": {"description": "In one of the games Arkady is fond of the game process happens on a rectangular field. In the game process Arkady can buy extensions for his field, each extension enlarges one of the field sizes in a particular number of times. Formally, there are n extensions, the i-th of them multiplies the width or the length (by Arkady's choice) by ai. Each extension can't be used more than once, the extensions can be used in any order.Now Arkady's field has size h\u2009\u00d7\u2009w. He wants to enlarge it so that it is possible to place a rectangle of size a\u2009\u00d7\u2009b on it (along the width or along the length, with sides parallel to the field sides). Find the minimum number of extensions needed to reach Arkady's goal.", "input_spec": "The first line contains five integers a, b, h, w and n (1\u2009\u2264\u2009a,\u2009b,\u2009h,\u2009w,\u2009n\u2009\u2264\u2009100\u2009000)\u00a0\u2014 the sizes of the rectangle needed to be placed, the initial sizes of the field and the number of available extensions. The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (2\u2009\u2264\u2009ai\u2009\u2264\u2009100\u2009000), where ai equals the integer a side multiplies by when the i-th extension is applied.", "output_spec": "Print the minimum number of extensions needed to reach Arkady's goal. If it is not possible to place the rectangle on the field with all extensions, print -1. If the rectangle can be placed on the initial field, print 0.", "sample_inputs": ["3 3 2 4 4\n2 5 4 10", "3 3 3 3 5\n2 3 5 4 2", "5 5 1 2 3\n2 2 3", "3 4 1 1 3\n2 3 2"], "sample_outputs": ["1", "0", "-1", "3"], "notes": "NoteIn the first example it is enough to use any of the extensions available. For example, we can enlarge h in 5 times using the second extension. Then h becomes equal 10 and it is now possible to place the rectangle on the field."}, "src_uid": "18cb436618b2b85c3f5dc348c80882d5"}
{"nl": {"description": "Artem has an array of n positive integers. Artem decided to play with it. The game consists of n moves. Each move goes like this. Artem chooses some element of the array and removes it. For that, he gets min(a,\u2009b) points, where a and b are numbers that were adjacent with the removed number. If the number doesn't have an adjacent number to the left or right, Artem doesn't get any points. After the element is removed, the two parts of the array glue together resulting in the new array that Artem continues playing with. Borya wondered what maximum total number of points Artem can get as he plays this game.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20095\u00b7105) \u2014 the number of elements in the array. The next line contains n integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009106) \u2014 the values of the array elements.", "output_spec": "In a single line print a single integer \u2014 the maximum number of points Artem can get.", "sample_inputs": ["5\n3 1 5 2 6", "5\n1 2 3 4 5", "5\n1 100 101 100 1"], "sample_outputs": ["11", "6", "102"], "notes": null}, "src_uid": "e7e0f9069166fe992abe6f0e19caa6a1"}
{"nl": {"description": "There is a square box 6\u2009\u00d7\u20096 in size. It contains 36 chips 1\u2009\u00d7\u20091 in size. Those chips contain 36 different characters \u2014 \"0\"-\"9\" and \"A\"-\"Z\". There is exactly one chip with each character.You are allowed to make the following operations: you may choose one of 6 rows or one of 6 columns and cyclically shift the chips there to one position to the left or to the right (for the row) or upwards or downwards (for the column). Those operations are allowed to perform several times. To solve the puzzle is to shift the chips using the above described operations so that they were written in the increasing order (exactly equal to the right picture). An example of solving the puzzle is shown on a picture below.  Write a program that finds the sequence of operations that solves the puzzle. That sequence should not necessarily be shortest, but you should not exceed the limit of 10000 operations. It is guaranteed that the solution always exists.", "input_spec": "The input data are represented by 6 lines containing 6 characters each. They are the puzzle's initial position. Those lines contain each character from the string \"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ\" exactly once.", "output_spec": "On the first line print number n, which is the number of operations. On the next n lines print the sequence of operations one per line. An operation is described by a word consisting of two characters. The first character shows the direction where the row or the column will be shifted. The possible directions are \"L\", \"R\" (to the left, to the right correspondingly, we shift a row), \"U\", \"D\" (upwards, downwards correspondingly, we shift a column). The second character is the number of the row (or the column), it is an integer from \"1\" to \"6\". The rows are numbered from the top to the bottom, the columns are numbered from the left to the right. The number of operations should not exceed 104. If there are several solutions, print any of them.", "sample_inputs": ["01W345\n729AB6\nCD8FGH\nIJELMN\nOPKRST\nUVQXYZ"], "sample_outputs": ["2\nR2\nU3"], "notes": null}, "src_uid": "10b2c1c53580dd382c41a56f7413e709"}
{"nl": {"description": "You are given two bracket sequences (not necessarily regular) $$$s$$$ and $$$t$$$ consisting only of characters '(' and ')'. You want to construct the shortest regular bracket sequence that contains both given bracket sequences as subsequences (not necessarily contiguous).Recall what is the regular bracket sequence:  () is the regular bracket sequence;  if $$$S$$$ is the regular bracket sequence, then ($$$S$$$) is a regular bracket sequence;  if $$$S$$$ and $$$T$$$ regular bracket sequences, then $$$ST$$$ (concatenation of $$$S$$$ and $$$T$$$) is a regular bracket sequence. Recall that the subsequence of the string $$$s$$$ is such string $$$t$$$ that can be obtained from $$$s$$$ by removing some (possibly, zero) amount of characters. For example, \"coder\", \"force\", \"cf\" and \"cores\" are subsequences of \"codeforces\", but \"fed\" and \"z\" are not.", "input_spec": "The first line of the input contains one bracket sequence $$$s$$$ consisting of no more than $$$200$$$ characters '(' and ')'. The second line of the input contains one bracket sequence $$$t$$$ consisting of no more than $$$200$$$ characters '(' and ')'.", "output_spec": "Print one line \u2014 the shortest regular bracket sequence that contains both given bracket sequences as subsequences (not necessarily contiguous). If there are several answers, you can print any.", "sample_inputs": ["(())(()\n()))()", ")\n((", ")\n)))", "())\n(()(()(()("], "sample_outputs": ["(())()()", "(())", "((()))", "(()()()(()()))"], "notes": null}, "src_uid": "cc222aab45b3ad3d0e71227592c883f1"}
{"nl": {"description": "There is a new TV game on BerTV. In this game two players get a number A consisting of 2n digits. Before each turn players determine who will make the next move. Each player should make exactly n moves. On it's turn i-th player takes the leftmost digit of A and appends it to his or her number Si. After that this leftmost digit is erased from A. Initially the numbers of both players (S1 and S2) are \u00abempty\u00bb. Leading zeroes in numbers A,\u2009S1,\u2009S2 are allowed. In the end of the game the first player gets S1 dollars, and the second gets S2 dollars.One day Homer and Marge came to play the game. They managed to know the number A beforehand. They want to find such sequence of their moves that both of them makes exactly n moves and which maximizes their total prize. Help them.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u200918). The second line contains integer A consisting of exactly 2n digits. This number can have leading zeroes.", "output_spec": "Output the line of 2n characters \u00abH\u00bb and \u00abM\u00bb \u2014 the sequence of moves of Homer and Marge, which gives them maximum possible total prize. Each player must make exactly n moves. If there are several solutions, output any of them.", "sample_inputs": ["2\n1234", "2\n9911"], "sample_outputs": ["HHMM", "HMHM"], "notes": null}, "src_uid": "98489fe54488dcfb45f8ae7b5c473d88"}
{"nl": {"description": "\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u043a\u043e\u0434 \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u0438 \u0441\u043b\u0438\u044f\u043d\u0438\u0435\u043c \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python: def sort(a):  n = len(a)  b = [0 for i in range(n)]  log = []  def mergeSort(l, r):    if r - l <= 1:      return    m = (l + r) >> 1    mergeSort(l, m)    mergeSort(m, r)    i, j, k = l, m, l    while i < m and j < r:      if a[i] < a[j]:        log.append('0')        b[k] = a[i]        i += 1      else:        log.append('1')        b[k] = a[j]        j += 1      k += 1    while i < m:      b[k] = a[i]      i += 1      k += 1    while j < r:      b[k] = a[j]      j += 1      k += 1    for p in range(l, r):      a[p] = b[p]  mergeSort(0, n)  return \"\".join(log)\u041a\u0430\u043a \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u043c\u0435\u0442\u0438\u0442\u044c, \u044d\u0442\u043e\u0442 \u043a\u043e\u0434 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043b\u043e\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u00a0\u2014 \u0432\u0430\u0436\u043d\u0435\u0439\u0448\u0438\u0439 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438.\u0421\u0442\u0430\u0440\u0448\u0438\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0412\u041a\u043e\u043d\u0442\u0430\u043a\u0442\u0435 \u0412\u0430\u0441\u044f \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043b \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 $$$a$$$ (\u043c\u0430\u0441\u0441\u0438\u0432 \u0438\u0437 $$$n$$$ \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0446\u0435\u043b\u044b\u0445 \u0447\u0438\u0441\u0435\u043b \u043e\u0442 $$$1$$$ \u0434\u043e $$$n$$$), \u0434\u0430\u043b \u0435\u0451 \u043d\u0430 \u0432\u0445\u043e\u0434 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 sort \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u043b \u043d\u0430 \u0432\u044b\u0445\u043e\u0434\u0435 \u0441\u0442\u0440\u043e\u043a\u0443 $$$s$$$. \u041d\u0430 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0434\u0435\u043d\u044c \u0441\u0442\u0440\u043e\u043a\u0443 $$$s$$$ \u0412\u0430\u0441\u044f \u043d\u0430\u0448\u0451\u043b, \u0430 \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 $$$a$$$ \u043f\u043e\u0442\u0435\u0440\u044f\u043b\u0430\u0441\u044c. \u0412\u0430\u0441\u044f \u0445\u043e\u0447\u0435\u0442 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u043b\u044e\u0431\u0443\u044e \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 $$$a$$$ \u0442\u0430\u043a\u0443\u044e, \u0447\u0442\u043e \u0432\u044b\u0437\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 sort \u043e\u0442 \u043d\u0435\u0451 \u0434\u0430\u0441\u0442 \u0442\u0443 \u0436\u0435 \u0441\u0442\u0440\u043e\u043a\u0443 $$$s$$$. \u041f\u043e\u043c\u043e\u0433\u0438\u0442\u0435 \u0435\u043c\u0443!", "input_spec": "\u0412\u0432\u043e\u0434 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u043d\u0435\u043f\u0443\u0441\u0442\u0443\u044e \u0441\u0442\u0440\u043e\u043a\u0443 $$$s$$$, \u0441\u043e\u0441\u0442\u043e\u044f\u0449\u0443\u044e \u0438\u0437 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 0 \u0438 1.  \u0412 \u044d\u0442\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0437\u0430\u0434\u0430\u0447\u0438 \u0434\u043b\u044f \u043b\u044e\u0431\u043e\u0433\u043e \u0442\u0435\u0441\u0442\u0430 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 \u0434\u043b\u0438\u043d\u044b $$$16$$$, \u0443\u0434\u043e\u0432\u043b\u0435\u0442\u0432\u043e\u0440\u044f\u044e\u0449\u0430\u044f \u0443\u0441\u043b\u043e\u0432\u0438\u044e. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0432\u0430\u0448 \u043e\u0442\u0432\u0435\u0442 \u043c\u043e\u0436\u0435\u0442 \u0438\u043c\u0435\u0442\u044c \u043b\u044e\u0431\u0443\u044e \u0434\u043b\u0438\u043d\u0443, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u043e\u0442\u043b\u0438\u0447\u043d\u0443\u044e \u043e\u0442 $$$16$$$.", "output_spec": "\u0412 \u043f\u0435\u0440\u0432\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u0446\u0435\u043b\u043e\u0435 \u0447\u0438\u0441\u043b\u043e $$$n$$$\u00a0\u2014 \u0434\u043b\u0438\u043d\u0443 \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438. \u0412\u043e \u0432\u0442\u043e\u0440\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432\u044b\u0432\u0435\u0434\u0438\u0442\u0435 $$$n$$$ \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0446\u0435\u043b\u044b\u0445 \u0447\u0438\u0441\u0435\u043b $$$a_0, a_1, \\ldots, a_{n-1}$$$ ($$$1 \\le a_i \\le n$$$)\u00a0\u2014 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438. \u0415\u0441\u043b\u0438 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u0432 \u043e\u0442\u0432\u0435\u0442\u0430, \u0432\u044b\u0432\u0435\u0434\u0438\u0442\u0435 \u043b\u044e\u0431\u043e\u0439 \u0438\u0437 \u043d\u0438\u0445.", "sample_inputs": ["00000000000000000000000000000000", "11111111111111111111111111111111", "101011010001100100011011001111011000011110010"], "sample_outputs": ["16\n1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16", "16\n16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1", "16\n13 6 1 7 12 5 4 15 14 16 10 11 3 8 9 2"], "notes": null}, "src_uid": "b2ee84d23d73947fa84faaaebfde85c8"}
{"nl": {"description": "Alena has successfully passed the entrance exams to the university and is now looking forward to start studying.One two-hour lesson at the Russian university is traditionally called a pair, it lasts for two academic hours (an academic hour is equal to 45 minutes).The University works in such a way that every day it holds exactly n lessons. Depending on the schedule of a particular group of students, on a given day, some pairs may actually contain classes, but some may be empty (such pairs are called breaks).The official website of the university has already published the schedule for tomorrow for Alena's group. Thus, for each of the n pairs she knows if there will be a class at that time or not.Alena's House is far from the university, so if there are breaks, she doesn't always go home. Alena has time to go home only if the break consists of at least two free pairs in a row, otherwise she waits for the next pair at the university.Of course, Alena does not want to be sleepy during pairs, so she will sleep as long as possible, and will only come to the first pair that is presented in her schedule. Similarly, if there are no more pairs, then Alena immediately goes home.Alena appreciates the time spent at home, so she always goes home when it is possible, and returns to the university only at the beginning of the next pair. Help Alena determine for how many pairs she will stay at the university. Note that during some pairs Alena may be at the university waiting for the upcoming pair.", "input_spec": "The first line of the input contains a positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of lessons at the university.  The second line contains n numbers ai (0\u2009\u2264\u2009ai\u2009\u2264\u20091). Number ai equals 0, if Alena doesn't have the i-th pairs, otherwise it is equal to 1. Numbers a1,\u2009a2,\u2009...,\u2009an are separated by spaces.", "output_spec": "Print a single number \u2014 the number of pairs during which Alena stays at the university.", "sample_inputs": ["5\n0 1 0 1 1", "7\n1 0 1 0 0 1 0", "1\n0"], "sample_outputs": ["4", "4", "0"], "notes": "NoteIn the first sample Alena stays at the university from the second to the fifth pair, inclusive, during the third pair she will be it the university waiting for the next pair. In the last sample Alena doesn't have a single pair, so she spends all the time at home."}, "src_uid": "2896aadda9e7a317d33315f91d1ca64d"}
{"nl": {"description": "Two little greedy bears have found two pieces of cheese in the forest of weight a and b grams, correspondingly. The bears are so greedy that they are ready to fight for the larger piece. That's where the fox comes in and starts the dialog: \"Little bears, wait a little, I want to make your pieces equal\" \"Come off it fox, how are you going to do that?\", the curious bears asked. \"It's easy\", said the fox. \"If the mass of a certain piece is divisible by two, then I can eat exactly a half of the piece. If the mass of a certain piece is divisible by three, then I can eat exactly two-thirds, and if the mass is divisible by five, then I can eat four-fifths. I'll eat a little here and there and make the pieces equal\". The little bears realize that the fox's proposal contains a catch. But at the same time they realize that they can not make the two pieces equal themselves. So they agreed to her proposal, but on one condition: the fox should make the pieces equal as quickly as possible. Find the minimum number of operations the fox needs to make pieces equal.", "input_spec": "The first line contains two space-separated integers a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109). ", "output_spec": "If the fox is lying to the little bears and it is impossible to make the pieces equal, print -1. Otherwise, print the required minimum number of operations. If the pieces of the cheese are initially equal, the required number is 0.", "sample_inputs": ["15 20", "14 8", "6 6"], "sample_outputs": ["3", "-1", "0"], "notes": null}, "src_uid": "75a97f4d85d50ea0e1af0d46f7565b49"}
{"nl": {"description": "The king Copa often has been reported about the Codeforces site, which is rapidly getting more and more popular among the brightest minds of the humanity, who are using it for training and competing. Recently Copa understood that to conquer the world he needs to organize the world Codeforces tournament. He hopes that after it the brightest minds will become his subordinates, and the toughest part of conquering the world will be completed.The final round of the Codeforces World Finals 20YY is scheduled for DD.MM.YY, where DD is the day of the round, MM is the month and YY are the last two digits of the year. Bob is lucky to be the first finalist form Berland. But there is one problem: according to the rules of the competition, all participants must be at least 18 years old at the moment of the finals. Bob was born on BD.BM.BY. This date is recorded in his passport, the copy of which he has already mailed to the organizers. But Bob learned that in different countries the way, in which the dates are written, differs. For example, in the US the month is written first, then the day and finally the year. Bob wonders if it is possible to rearrange the numbers in his date of birth so that he will be at least 18 years old on the day DD.MM.YY. He can always tell that in his motherland dates are written differently. Help him.According to another strange rule, eligible participant must be born in the same century as the date of the finals. If the day of the finals is participant's 18-th birthday, he is allowed to participate. As we are considering only the years from 2001 to 2099 for the year of the finals, use the following rule: the year is leap if it's number is divisible by four.", "input_spec": "The first line contains the date DD.MM.YY, the second line contains the date BD.BM.BY. It is guaranteed that both dates are correct, and YY and BY are always in [01;99]. It could be that by passport Bob was born after the finals. In this case, he can still change the order of numbers in date.", "output_spec": "If it is possible to rearrange the numbers in the date of birth so that Bob will be at least 18 years old on the DD.MM.YY, output YES. In the other case, output NO.  Each number contains exactly two digits and stands for day, month or year in a date. Note that it is permitted to rearrange only numbers, not digits.", "sample_inputs": ["01.01.98\n01.01.80", "20.10.20\n10.02.30", "28.02.74\n28.02.64"], "sample_outputs": ["YES", "NO", "NO"], "notes": null}, "src_uid": "5418c98fe362909f7b28f95225837d33"}
{"nl": {"description": "To get money for a new aeonic blaster, ranger Qwerty decided to engage in trade for a while. He wants to buy some number of items (or probably not to buy anything at all) on one of the planets, and then sell the bought items on another planet. Note that this operation is not repeated, that is, the buying and the selling are made only once. To carry out his plan, Qwerty is going to take a bank loan that covers all expenses and to return the loaned money at the end of the operation (the money is returned without the interest). At the same time, Querty wants to get as much profit as possible.The system has n planets in total. On each of them Qwerty can buy or sell items of m types (such as food, medicine, weapons, alcohol, and so on). For each planet i and each type of items j Qwerty knows the following: aij \u2014 the cost of buying an item;  bij \u2014 the cost of selling an item;  cij \u2014 the number of remaining items.It is not allowed to buy more than cij items of type j on planet i, but it is allowed to sell any number of items of any kind.Knowing that the hold of Qwerty's ship has room for no more than k items, determine the maximum profit which Qwerty can get.", "input_spec": "The first line contains three space-separated integers n, m and k (2\u2009\u2264\u2009n\u2009\u2264\u200910, 1\u2009\u2264\u2009m,\u2009k\u2009\u2264\u2009100) \u2014 the number of planets, the number of question types and the capacity of Qwerty's ship hold, correspondingly. Then follow n blocks describing each planet. The first line of the i-th block has the planet's name as a string with length from 1 to 10 Latin letters. The first letter of the name is uppercase, the rest are lowercase. Then in the i-th block follow m lines, the j-th of them contains three integers aij, bij and cij (1\u2009\u2264\u2009bij\u2009<\u2009aij\u2009\u2264\u20091000, 0\u2009\u2264\u2009cij\u2009\u2264\u2009100) \u2014 the numbers that describe money operations with the j-th item on the i-th planet. The numbers in the lines are separated by spaces. It is guaranteed that the names of all planets are different.", "output_spec": "Print a single number \u2014 the maximum profit Qwerty can get.", "sample_inputs": ["3 3 10\nVenus\n6 5 3\n7 6 5\n8 6 10\nEarth\n10 9 0\n8 6 4\n10 9 3\nMars\n4 3 0\n8 4 12\n7 2 5"], "sample_outputs": ["16"], "notes": "NoteIn the first test case you should fly to planet Venus, take a loan on 74 units of money and buy three items of the first type and 7 items of the third type (3\u00b76\u2009+\u20097\u00b78\u2009=\u200974). Then the ranger should fly to planet Earth and sell there all the items he has bought. He gets 3\u00b79\u2009+\u20097\u00b79\u2009=\u200990 units of money for the items, he should give 74 of them for the loan. The resulting profit equals 16 units of money. We cannot get more profit in this case."}, "src_uid": "7419c4268a9815282fadca6581f28ec1"}
{"nl": {"description": "Translator's note: in Russia's most widespread grading system, there are four grades: 5, 4, 3, 2, the higher the better, roughly corresponding to A, B, C and F respectively in American grading system.The term is coming to an end and students start thinking about their grades. Today, a professor told his students that the grades for his course would be given out automatically \u00a0\u2014 he would calculate the simple average (arithmetic mean) of all grades given out for lab works this term and round to the nearest integer. The rounding would be done in favour of the student\u00a0\u2014 $$$4.5$$$ would be rounded up to $$$5$$$ (as in example 3), but $$$4.4$$$ would be rounded down to $$$4$$$.This does not bode well for Vasya who didn't think those lab works would influence anything, so he may receive a grade worse than $$$5$$$ (maybe even the dreaded $$$2$$$). However, the professor allowed him to redo some of his works of Vasya's choosing to increase his average grade. Vasya wants to redo as as few lab works as possible in order to get $$$5$$$ for the course. Of course, Vasya will get $$$5$$$ for the lab works he chooses to redo.Help Vasya\u00a0\u2014 calculate the minimum amount of lab works Vasya has to redo.", "input_spec": "The first line contains a single integer $$$n$$$\u00a0\u2014 the number of Vasya's grades ($$$1 \\leq n \\leq 100$$$). The second line contains $$$n$$$ integers from $$$2$$$ to $$$5$$$\u00a0\u2014 Vasya's grades for his lab works.", "output_spec": "Output a single integer\u00a0\u2014 the minimum amount of lab works that Vasya has to redo. It can be shown that Vasya can always redo enough lab works to get a $$$5$$$.", "sample_inputs": ["3\n4 4 4", "4\n5 4 5 5", "4\n5 3 3 5"], "sample_outputs": ["2", "0", "1"], "notes": "NoteIn the first sample, it is enough to redo two lab works to make two $$$4$$$s into $$$5$$$s.In the second sample, Vasya's average is already $$$4.75$$$ so he doesn't have to redo anything to get a $$$5$$$.In the second sample Vasya has to redo one lab work to get rid of one of the $$$3$$$s, that will make the average exactly $$$4.5$$$ so the final grade would be $$$5$$$."}, "src_uid": "715608282b27a0a25b66f08574a6d5bd"}
{"nl": {"description": "Firecrackers scare Nian the monster, but they're wayyyyy too noisy! Maybe fireworks make a nice complement.Little Tommy is watching a firework show. As circular shapes spread across the sky, a splendid view unfolds on the night of Lunar New Year's eve.A wonder strikes Tommy. How many regions are formed by the circles on the sky? We consider the sky as a flat plane. A region is a connected part of the plane with positive area, whose bound consists of parts of bounds of the circles and is a curve or several curves without self-intersections, and that does not contain any curve other than its boundaries. Note that exactly one of the regions extends infinitely.", "input_spec": "The first line of input contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u20093), denoting the number of circles. The following n lines each contains three space-separated integers x, y and r (\u2009-\u200910\u2009\u2264\u2009x,\u2009y\u2009\u2264\u200910, 1\u2009\u2264\u2009r\u2009\u2264\u200910), describing a circle whose center is (x,\u2009y) and the radius is r. No two circles have the same x, y and r at the same time.", "output_spec": "Print a single integer\u00a0\u2014 the number of regions on the plane.", "sample_inputs": ["3\n0 0 1\n2 0 1\n4 0 1", "3\n0 0 2\n3 0 2\n6 0 2", "3\n0 0 2\n2 0 2\n1 1 2"], "sample_outputs": ["4", "6", "8"], "notes": "NoteFor the first example,  For the second example,  For the third example,  "}, "src_uid": "bda5879e94a82c6fd499796f258c4691"}
{"nl": {"description": "Stepan has a very big positive integer.Let's consider all cyclic shifts of Stepan's integer (if we look at his integer like at a string) which are also integers (i.e. they do not have leading zeros). Let's call such shifts as good shifts. For example, for the integer 10203 the good shifts are the integer itself 10203 and integers 20310 and 31020.Stepan wants to know the minimum remainder of the division by the given number m among all good shifts. Your task is to determine the minimum remainder of the division by m.", "input_spec": "The first line contains the integer which Stepan has. The length of Stepan's integer is between 2 and 200\u2009000 digits, inclusive. It is guaranteed that Stepan's integer does not contain leading zeros. The second line contains the integer m (2\u2009\u2264\u2009m\u2009\u2264\u2009108) \u2014 the number by which Stepan divides good shifts of his integer.", "output_spec": "Print the minimum remainder which Stepan can get if he divides all good shifts of his integer by the given number m.", "sample_inputs": ["521\n3", "1001\n5", "5678901234567890123456789\n10000"], "sample_outputs": ["2", "0", "123"], "notes": "NoteIn the first example all good shifts of the integer 521 (good shifts are equal to 521, 215 and 152) has same remainder 2 when dividing by 3.In the second example there are only two good shifts: the Stepan's integer itself and the shift by one position to the right. The integer itself is 1001 and the remainder after dividing it by 5 equals 1. The shift by one position to the right equals to 1100 and the remainder after dividing it by 5 equals 0, which is the minimum possible remainder."}, "src_uid": "d13c7b5b5fc5c433cc8f374ddb16ef79"}
{"nl": {"description": "PolandBall is a young, clever Ball. He is interested in prime numbers. He has stated a following hypothesis: \"There exists such a positive integer n that for each positive integer m number n\u00b7m\u2009+\u20091 is a prime number\".Unfortunately, PolandBall is not experienced yet and doesn't know that his hypothesis is incorrect. Could you prove it wrong? Write a program that finds a counterexample for any n.", "input_spec": "The only number in the input is n (1\u2009\u2264\u2009n\u2009\u2264\u20091000)\u00a0\u2014 number from the PolandBall's hypothesis. ", "output_spec": "Output such m that n\u00b7m\u2009+\u20091 is not a prime number. Your answer will be considered correct if you output any suitable m such that 1\u2009\u2264\u2009m\u2009\u2264\u2009103. It is guaranteed the the answer exists.", "sample_inputs": ["3", "4"], "sample_outputs": ["1", "2"], "notes": "NoteA prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.For the first sample testcase, 3\u00b71\u2009+\u20091\u2009=\u20094. We can output 1.In the second sample testcase, 4\u00b71\u2009+\u20091\u2009=\u20095. We cannot output 1 because 5 is prime. However, m\u2009=\u20092 is okay since 4\u00b72\u2009+\u20091\u2009=\u20099, which is not a prime number."}, "src_uid": "5c68e20ac6ecb7c289601ce8351f4e97"}
{"nl": {"description": "A monster is chasing after Rick and Morty on another planet. They're so frightened that sometimes they scream. More accurately, Rick screams at times b,\u2009b\u2009+\u2009a,\u2009b\u2009+\u20092a,\u2009b\u2009+\u20093a,\u2009... and Morty screams at times d,\u2009d\u2009+\u2009c,\u2009d\u2009+\u20092c,\u2009d\u2009+\u20093c,\u2009....   The Monster will catch them if at any point they scream at the same time, so it wants to know when it will catch them (the first time they scream at the same time) or that they will never scream at the same time.", "input_spec": "The first line of input contains two integers a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009100).  The second line contains two integers c and d (1\u2009\u2264\u2009c,\u2009d\u2009\u2264\u2009100).", "output_spec": "Print the first time Rick and Morty will scream at the same time, or \u2009-\u20091 if they will never scream at the same time.", "sample_inputs": ["20 2\n9 19", "2 1\n16 12"], "sample_outputs": ["82", "-1"], "notes": "NoteIn the first sample testcase, Rick's 5th scream and Morty's 8th time are at time 82. In the second sample testcase, all Rick's screams will be at odd times and Morty's will be at even times, so they will never scream at the same time."}, "src_uid": "158cb12d45f4ee3368b94b2b622693e7"}
{"nl": {"description": "Some time ago Leonid have known about idempotent functions. Idempotent function defined on a set {1,\u20092,\u2009...,\u2009n} is such function , that for any  the formula g(g(x))\u2009=\u2009g(x) holds.Let's denote as f(k)(x) the function f applied k times to the value x. More formally, f(1)(x)\u2009=\u2009f(x), f(k)(x)\u2009=\u2009f(f(k\u2009-\u20091)(x)) for each k\u2009>\u20091.You are given some function . Your task is to find minimum positive integer k such that function f(k)(x) is idempotent.", "input_spec": "In the first line of the input there is a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009200) \u2014 the size of function f domain. In the second line follow f(1),\u2009f(2),\u2009...,\u2009f(n) (1\u2009\u2264\u2009f(i)\u2009\u2264\u2009n for each 1\u2009\u2264\u2009i\u2009\u2264\u2009n), the values of a function.", "output_spec": "Output minimum k such that function f(k)(x) is idempotent.", "sample_inputs": ["4\n1 2 2 4", "3\n2 3 3", "3\n2 3 1"], "sample_outputs": ["1", "2", "3"], "notes": "NoteIn the first sample test function f(x)\u2009=\u2009f(1)(x) is already idempotent since f(f(1))\u2009=\u2009f(1)\u2009=\u20091, f(f(2))\u2009=\u2009f(2)\u2009=\u20092, f(f(3))\u2009=\u2009f(3)\u2009=\u20092, f(f(4))\u2009=\u2009f(4)\u2009=\u20094.In the second sample test:   function f(x)\u2009=\u2009f(1)(x) isn't idempotent because f(f(1))\u2009=\u20093 but f(1)\u2009=\u20092;  function f(x)\u2009=\u2009f(2)(x) is idempotent since for any x it is true that f(2)(x)\u2009=\u20093, so it is also true that f(2)(f(2)(x))\u2009=\u20093. In the third sample test:   function f(x)\u2009=\u2009f(1)(x) isn't idempotent because f(f(1))\u2009=\u20093 but f(1)\u2009=\u20092;  function f(f(x))\u2009=\u2009f(2)(x) isn't idempotent because f(2)(f(2)(1))\u2009=\u20092 but f(2)(1)\u2009=\u20093;  function f(f(f(x)))\u2009=\u2009f(3)(x) is idempotent since it is identity function: f(3)(x)\u2009=\u2009x for any  meaning that the formula f(3)(f(3)(x))\u2009=\u2009f(3)(x) also holds. "}, "src_uid": "1daa784c0eb1cde514e4319da07c8d00"}
{"nl": {"description": "Petya is preparing for IQ test and he has noticed that there many problems like: you are given a sequence, find the next number. Now Petya can solve only problems with arithmetic or geometric progressions.Arithmetic progression is a sequence a1, a1\u2009+\u2009d, a1\u2009+\u20092d, ..., a1\u2009+\u2009(n\u2009-\u20091)d, where a1 and d are any numbers.Geometric progression is a sequence b1, b2\u2009=\u2009b1q, ..., bn\u2009=\u2009bn\u2009-\u20091q, where b1\u2009\u2260\u20090, q\u2009\u2260\u20090, q\u2009\u2260\u20091. Help Petya and write a program to determine if the given sequence is arithmetic or geometric. Also it should found the next number. If the sequence is neither arithmetic nor geometric, print 42 (he thinks it is impossible to find better answer). You should also print 42 if the next element of progression is not integer. So answer is always integer.", "input_spec": "The first line contains exactly four integer numbers between 1 and 1000, inclusively.", "output_spec": "Print the required number. If the given sequence is arithmetic progression, print the next progression element. Similarly, if the given sequence is geometric progression, print the next progression element. Print 42 if the given sequence is not an arithmetic or geometric progression.", "sample_inputs": ["836 624 412 200", "1 334 667 1000"], "sample_outputs": ["-12", "1333"], "notes": "NoteThis problem contains very weak pretests!"}, "src_uid": "68a9508d49fec672f9c61766d6051047"}
{"nl": {"description": "Ternary numeric notation is quite popular in Berland. To telegraph the ternary number the Borze alphabet is used. Digit 0 is transmitted as \u00ab.\u00bb, 1 as \u00ab-.\u00bb and 2 as \u00ab--\u00bb. You are to decode the Borze code, i.e. to find out the ternary number given its representation in Borze alphabet.", "input_spec": "The first line contains a number in Borze code. The length of the string is between 1 and 200 characters. It's guaranteed that the given string is a valid Borze code of some ternary number (this number can have leading zeroes).", "output_spec": "Output the decoded ternary number. It can have leading zeroes.", "sample_inputs": [".-.--", "--.", "-..-.--"], "sample_outputs": ["012", "20", "1012"], "notes": null}, "src_uid": "46b5a1cd1bd2985f2752662b7dbb1869"}
{"nl": {"description": "Luke Skywalker gave Chewbacca an integer number x. Chewbacca isn't good at numbers but he loves inverting digits in them. Inverting digit t means replacing it with digit 9\u2009-\u2009t. Help Chewbacca to transform the initial number x to the minimum possible positive number by inverting some (possibly, zero) digits. The decimal representation of the final number shouldn't start with a zero.", "input_spec": "The first line contains a single integer x (1\u2009\u2264\u2009x\u2009\u2264\u20091018) \u2014 the number that Luke Skywalker gave to Chewbacca.", "output_spec": "Print the minimum possible positive number that Chewbacca can obtain after inverting some digits. The number shouldn't contain leading zeroes.", "sample_inputs": ["27", "4545"], "sample_outputs": ["22", "4444"], "notes": null}, "src_uid": "d5de5052b4e9bbdb5359ac6e05a18b61"}
{"nl": {"description": "Simon and Antisimon play a game. Initially each player receives one fixed positive integer that doesn't change throughout the game. Simon receives number a and Antisimon receives number b. They also have a heap of n stones. The players take turns to make a move and Simon starts. During a move a player should take from the heap the number of stones equal to the greatest common divisor of the fixed number he has received and the number of stones left in the heap. A player loses when he cannot take the required number of stones (i. e. the heap has strictly less stones left than one needs to take). Your task is to determine by the given a, b and n who wins the game.", "input_spec": "The only string contains space-separated integers a, b and n (1\u2009\u2264\u2009a,\u2009b,\u2009n\u2009\u2264\u2009100) \u2014 the fixed numbers Simon and Antisimon have received correspondingly and the initial number of stones in the pile.", "output_spec": "If Simon wins, print \"0\" (without the quotes), otherwise print \"1\" (without the quotes).", "sample_inputs": ["3 5 9", "1 1 100"], "sample_outputs": ["0", "1"], "notes": "NoteThe greatest common divisor of two non-negative integers a and b is such maximum positive integer k, that a is divisible by k without remainder and similarly, b is divisible by k without remainder. Let gcd(a,\u2009b) represent the operation of calculating the greatest common divisor of numbers a and b. Specifically, gcd(x,\u20090)\u2009=\u2009gcd(0,\u2009x)\u2009=\u2009x.In the first sample the game will go like that: Simon should take gcd(3,\u20099)\u2009=\u20093 stones from the heap. After his move the heap has 6 stones left. Antisimon should take gcd(5,\u20096)\u2009=\u20091 stone from the heap. After his move the heap has 5 stones left. Simon should take gcd(3,\u20095)\u2009=\u20091 stone from the heap. After his move the heap has 4 stones left. Antisimon should take gcd(5,\u20094)\u2009=\u20091 stone from the heap. After his move the heap has 3 stones left. Simon should take gcd(3,\u20093)\u2009=\u20093 stones from the heap. After his move the heap has 0 stones left. Antisimon should take gcd(5,\u20090)\u2009=\u20095 stones from the heap. As 0\u2009<\u20095, it is impossible and Antisimon loses.In the second sample each player during each move takes one stone from the heap. As n is even, Antisimon takes the last stone and Simon can't make a move after that."}, "src_uid": "0bd6fbb6b0a2e7e5f080a70553149ac2"}
{"nl": {"description": "Certainly, everyone is familiar with tic-tac-toe game. The rules are very simple indeed. Two players take turns marking the cells in a 3\u2009\u00d7\u20093 grid (one player always draws crosses, the other \u2014 noughts). The player who succeeds first in placing three of his marks in a horizontal, vertical or diagonal line wins, and the game is finished. The player who draws crosses goes first. If the grid is filled, but neither Xs, nor 0s form the required line, a draw is announced.You are given a 3\u2009\u00d7\u20093 grid, each grid cell is empty, or occupied by a cross or a nought. You have to find the player (first or second), whose turn is next, or print one of the verdicts below:   illegal \u2014 if the given board layout can't appear during a valid game;  the first player won \u2014 if in the given board layout the first player has just won;  the second player won \u2014 if in the given board layout the second player has just won;  draw \u2014 if the given board layout has just let to a draw. ", "input_spec": "The input consists of three lines, each of the lines contains characters \".\", \"X\" or \"0\" (a period, a capital letter X, or a digit zero).", "output_spec": "Print one of the six verdicts: first, second, illegal, the first player won, the second player won or draw.", "sample_inputs": ["X0X\n.0.\n.X."], "sample_outputs": ["second"], "notes": null}, "src_uid": "892680e26369325fb00d15543a96192c"}
{"nl": {"description": "Polar bears Menshykov and Uslada from the zoo of St. Petersburg and elephant Horace from the zoo of Kiev decided to build a house of cards. For that they've already found a hefty deck of n playing cards. Let's describe the house they want to make:   The house consists of some non-zero number of floors.  Each floor consists of a non-zero number of rooms and the ceiling. A room is two cards that are leaned towards each other. The rooms are made in a row, each two adjoining rooms share a ceiling made by another card.  Each floor besides for the lowest one should contain less rooms than the floor below. Please note that the house may end by the floor with more than one room, and in this case they also must be covered by the ceiling. Also, the number of rooms on the adjoining floors doesn't have to differ by one, the difference may be more. While bears are practicing to put cards, Horace tries to figure out how many floors their house should consist of. The height of the house is the number of floors in it. It is possible that you can make a lot of different houses of different heights out of n cards. It seems that the elephant cannot solve this problem and he asks you to count the number of the distinct heights of the houses that they can make using exactly n cards.", "input_spec": "The single line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091012) \u2014 the number of cards.", "output_spec": "Print the number of distinct heights that the houses made of exactly n cards can have.", "sample_inputs": ["13", "6"], "sample_outputs": ["1", "0"], "notes": "NoteIn the first sample you can build only these two houses (remember, you must use all the cards):  Thus, 13 cards are enough only for two floor houses, so the answer is 1.The six cards in the second sample are not enough to build any house."}, "src_uid": "ab4f9cb3bb0df6389a4128e9ff1207de"}
{"nl": {"description": "Two teams meet in The Game World Championship. Some scientists consider this game to be the most intellectually challenging game in the world. You are given two strings describing the teams' actions in the final battle. Figure out who became the champion.", "input_spec": "The input contains two strings of equal length (between 2 and 20 characters, inclusive). Each line describes the actions of one team.", "output_spec": "Output \"TEAM 1 WINS\" if the first team won, \"TEAM 2 WINS\" if the second team won, and \"TIE\" if there was a tie.", "sample_inputs": ["[]()[]8<\n8<[]()8<", "8<8<()\n[]8<[]"], "sample_outputs": ["TEAM 2 WINS", "TIE"], "notes": null}, "src_uid": "bdf2e78c47d078b4ba61741b6fbb23cf"}
{"nl": {"description": "Two positive integers a and b have a sum of s and a bitwise XOR of x. How many possible values are there for the ordered pair (a,\u2009b)?", "input_spec": "The first line of the input contains two integers s and x (2\u2009\u2264\u2009s\u2009\u2264\u20091012, 0\u2009\u2264\u2009x\u2009\u2264\u20091012), the sum and bitwise xor of the pair of positive integers, respectively.", "output_spec": "Print a single integer, the number of solutions to the given conditions. If no solutions exist, print 0.", "sample_inputs": ["9 5", "3 3", "5 2"], "sample_outputs": ["4", "2", "0"], "notes": "NoteIn the first sample, we have the following solutions: (2,\u20097), (3,\u20096), (6,\u20093), (7,\u20092).In the second sample, the only solutions are (1,\u20092) and (2,\u20091)."}, "src_uid": "18410980789b14c128dd6adfa501aea5"}
{"nl": {"description": "You are given two positive integer numbers a and b. Permute (change order) of the digits of a to construct maximal number not exceeding b. No number in input and/or output can start with the digit 0.It is allowed to leave a as it is.", "input_spec": "The first line contains integer a (1\u2009\u2264\u2009a\u2009\u2264\u20091018). The second line contains integer b (1\u2009\u2264\u2009b\u2009\u2264\u20091018). Numbers don't have leading zeroes. It is guaranteed that answer exists.", "output_spec": "Print the maximum possible number that is a permutation of digits of a and is not greater than b. The answer can't have any leading zeroes. It is guaranteed that the answer exists. The number in the output should have exactly the same length as number a. It should be a permutation of digits of a.", "sample_inputs": ["123\n222", "3921\n10000", "4940\n5000"], "sample_outputs": ["213", "9321", "4940"], "notes": null}, "src_uid": "bc31a1d4a02a0011eb9f5c754501cd44"}
{"nl": {"description": "Polycarpus analyzes a string called abracadabra. This string is constructed using the following algorithm:   On the first step the string consists of a single character \"a\".  On the k-th step Polycarpus concatenates two copies of the string obtained on the (k\u2009-\u20091)-th step, while inserting the k-th character of the alphabet between them. Polycarpus uses the alphabet that consists of lowercase Latin letters and digits (a total of 36 characters). The alphabet characters are numbered like this: the 1-st character is \"a\", the 2-nd \u2014 \"b\", ..., the 26-th \u2014 \"z\", the 27-th \u2014 \"0\", the 28-th \u2014 \"1\", ..., the 36-th \u2014 \"9\". Let's have a closer look at the algorithm. On the second step Polycarpus will concatenate two strings \"a\" and insert the character \"b\" between them, resulting in \"aba\" string. The third step will transform it into \"abacaba\", and the fourth one - into \"abacabadabacaba\". Thus, the string constructed on the k-th step will consist of 2k\u2009-\u20091 characters. Polycarpus wrote down the string he got after 30 steps of the given algorithm and chose two non-empty substrings of it. Your task is to find the length of the longest common substring of the two substrings selected by Polycarpus.A substring s[i... j] (1\u2009\u2264\u2009i\u2009\u2264\u2009j\u2009\u2264\u2009|s|) of string s = s1s2... s|s| is a string sisi\u2009+\u20091... sj. For example, substring s[2...4] of string s = \"abacaba\" equals \"bac\". The string is its own substring.The longest common substring of two strings s and t is the longest string that is a substring of both s and t. For example, the longest common substring of \"contest\" and \"systemtesting\" is string \"test\". There can be several common substrings of maximum length.", "input_spec": "The input consists of a single line containing four integers l1, r1, l2, r2 (1\u2009\u2264\u2009li\u2009\u2264\u2009ri\u2009\u2264\u2009109, i\u2009=\u20091,\u20092). The numbers are separated by single spaces. li and ri give the indices of the first and the last characters of the i-th chosen substring, correspondingly (i\u2009=\u20091,\u20092). The characters of string abracadabra are numbered starting from 1.", "output_spec": "Print a single number \u2014 the length of the longest common substring of the given strings. If there are no common substrings, print 0.", "sample_inputs": ["3 6 1 4", "1 1 4 4"], "sample_outputs": ["2", "0"], "notes": "NoteIn the first sample the first substring is \"acab\", the second one is \"abac\". These two substrings have two longest common substrings \"ac\" and \"ab\", but we are only interested in their length \u2014 2.In the second sample the first substring is \"a\", the second one is \"c\". These two substrings don't have any common characters, so the length of their longest common substring is 0."}, "src_uid": "fe3c0c4c7e9b3afebf2c958251f10513"}
{"nl": {"description": "In this problem you will meet the simplified model of game King of Thieves.In a new ZeptoLab game called \"King of Thieves\" your aim is to reach a chest with gold by controlling your character, avoiding traps and obstacles on your way.  An interesting feature of the game is that you can design your own levels that will be available to other players. Let's consider the following simple design of a level.A dungeon consists of n segments located at a same vertical level, each segment is either a platform that character can stand on, or a pit with a trap that makes player lose if he falls into it. All segments have the same length, platforms on the scheme of the level are represented as '*' and pits are represented as '.'. One of things that affects speedrun characteristics of the level is a possibility to perform a series of consecutive jumps of the same length. More formally, when the character is on the platform number i1, he can make a sequence of jumps through the platforms i1\u2009<\u2009i2\u2009<\u2009...\u2009<\u2009ik, if i2\u2009-\u2009i1\u2009=\u2009i3\u2009-\u2009i2\u2009=\u2009...\u2009=\u2009ik\u2009-\u2009ik\u2009-\u20091. Of course, all segments i1,\u2009i2,\u2009... ik should be exactly the platforms, not pits. Let's call a level to be good if you can perform a sequence of four jumps of the same length or in the other words there must be a sequence i1,\u2009i2,\u2009...,\u2009i5, consisting of five platforms so that the intervals between consecutive platforms are of the same length. Given the scheme of the level, check if it is good.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of segments on the level. Next line contains the scheme of the level represented as a string of n characters '*' and '.'.", "output_spec": "If the level is good, print the word \"yes\" (without the quotes), otherwise print the word \"no\" (without the quotes).", "sample_inputs": ["16\n.**.*..*.***.**.", "11\n.*.*...*.*."], "sample_outputs": ["yes", "no"], "notes": "NoteIn the first sample test you may perform a sequence of jumps through platforms 2,\u20095,\u20098,\u200911,\u200914."}, "src_uid": "12d451eb1b401a8f426287c4c6909e4b"}
{"nl": {"description": "Nowadays, most of the internet advertisements are not statically linked to a web page. Instead, what will be shown to the person opening a web page is determined within 100 milliseconds after the web page is opened. Usually, multiple companies compete for each ad slot on the web page in an auction. Each of them receives a request with details about the user, web page and ad slot and they have to respond within those 100 milliseconds with a bid they would pay for putting an advertisement on that ad slot. The company that suggests the highest bid wins the auction and gets to place its advertisement. If there are several companies tied for the highest bid, the winner gets picked at random.However, the company that won the auction does not have to pay the exact amount of its bid. In most of the cases, a second-price auction is used. This means that the amount paid by the company is equal to the maximum of all the other bids placed for this ad slot.Let's consider one such bidding. There are n companies competing for placing an ad. The i-th of these companies will bid an integer number of microdollars equiprobably randomly chosen from the range between Li and Ri, inclusive. In the other words, the value of the i-th company bid can be any integer from the range [Li,\u2009Ri] with the same probability. Determine the expected value that the winner will have to pay in a second-price auction.", "input_spec": "The first line of input contains an integer number n (2\u2009\u2264\u2009n\u2009\u2264\u20095). n lines follow, the i-th of them containing two numbers Li and Ri (1\u2009\u2264\u2009Li\u2009\u2264\u2009Ri\u2009\u2264\u200910000) describing the i-th company's bid preferences. This problem doesn't have subproblems. You will get 8 points for the correct submission.", "output_spec": "Output the answer with absolute or relative error no more than 1e\u2009-\u20099.", "sample_inputs": ["3\n4 7\n8 10\n5 5", "3\n2 5\n3 4\n1 6"], "sample_outputs": ["5.7500000000", "3.5000000000"], "notes": "NoteConsider the first example. The first company bids a random integer number of microdollars in range [4,\u20097]; the second company bids between 8 and 10, and the third company bids 5 microdollars. The second company will win regardless of the exact value it bids, however the price it will pay depends on the value of first company's bid. With probability 0.5 the first company will bid at most 5 microdollars, and the second-highest price of the whole auction will be 5. With probability 0.25 it will bid 6 microdollars, and with probability 0.25 it will bid 7 microdollars. Thus, the expected value the second company will have to pay is 0.5\u00b75\u2009+\u20090.25\u00b76\u2009+\u20090.25\u00b77\u2009=\u20095.75."}, "src_uid": "5258ce738eb268b9750cfef309d265ef"}
{"nl": {"description": "Today in the scientific lyceum of the Kingdom of Kremland, there was a biology lesson. The topic of the lesson was the genomes. Let's call the genome the string \"ACTG\".Maxim was very boring to sit in class, so the teacher came up with a task for him: on a given string $$$s$$$ consisting of uppercase letters and length of at least $$$4$$$, you need to find the minimum number of operations that you need to apply, so that the genome appears in it as a substring. For one operation, you can replace any letter in the string $$$s$$$ with the next or previous in the alphabet. For example, for the letter \"D\" the previous one will be \"C\", and the next\u00a0\u2014 \"E\". In this problem, we assume that for the letter \"A\", the previous one will be the letter \"Z\", and the next one will be \"B\", and for the letter \"Z\", the previous one is the letter \"Y\", and the next one is the letter \"A\".Help Maxim solve the problem that the teacher gave him.A string $$$a$$$ is a substring of a string $$$b$$$ if $$$a$$$ can be obtained from $$$b$$$ by deletion of several (possibly, zero or all) characters from the beginning and several (possibly, zero or all) characters from the end.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$4 \\leq n \\leq 50$$$)\u00a0\u2014 the length of the string $$$s$$$. The second line contains the string $$$s$$$, consisting of exactly $$$n$$$ uppercase letters of the Latin alphabet.", "output_spec": "Output the minimum number of operations that need to be applied to the string $$$s$$$ so that the genome appears as a substring in it.", "sample_inputs": ["4\nZCTH", "5\nZDATG", "6\nAFBAKC"], "sample_outputs": ["2", "5", "16"], "notes": "NoteIn the first example, you should replace the letter \"Z\" with \"A\" for one operation, the letter \"H\"\u00a0\u2014 with the letter \"G\" for one operation. You will get the string \"ACTG\", in which the genome is present as a substring.In the second example, we replace the letter \"A\" with \"C\" for two operations, the letter \"D\"\u00a0\u2014 with the letter \"A\" for three operations. You will get the string \"ZACTG\", in which there is a genome."}, "src_uid": "ee4f88abe4c9fa776abd15c5f3a94543"}
{"nl": {"description": "Vivek initially has an empty array $$$a$$$ and some integer constant $$$m$$$.He performs the following algorithm:  Select a random integer $$$x$$$ uniformly in range from $$$1$$$ to $$$m$$$ and append it to the end of $$$a$$$.  Compute the greatest common divisor of integers in $$$a$$$.  In case it equals to $$$1$$$, break  Otherwise, return to step $$$1$$$. Find the expected length of $$$a$$$. It can be shown that it can be represented as $$$\\frac{P}{Q}$$$ where $$$P$$$ and $$$Q$$$ are coprime integers and $$$Q\\neq 0 \\pmod{10^9+7}$$$. Print the value of $$$P \\cdot Q^{-1} \\pmod{10^9+7}$$$.", "input_spec": "The first and only line contains a single integer $$$m$$$ ($$$1 \\leq m \\leq 100000$$$).", "output_spec": "Print a single integer\u00a0\u2014 the expected length of the array $$$a$$$ written as $$$P \\cdot Q^{-1} \\pmod{10^9+7}$$$.", "sample_inputs": ["1", "2", "4"], "sample_outputs": ["1", "2", "333333338"], "notes": "NoteIn the first example, since Vivek can choose only integers from $$$1$$$ to $$$1$$$, he will have $$$a=[1]$$$ after the first append operation, and after that quit the algorithm. Hence the length of $$$a$$$ is always $$$1$$$, so its expected value is $$$1$$$ as well.In the second example, Vivek each time will append either $$$1$$$ or $$$2$$$, so after finishing the algorithm he will end up having some number of $$$2$$$'s (possibly zero), and a single $$$1$$$ in the end. The expected length of the list is $$$1\\cdot \\frac{1}{2} + 2\\cdot \\frac{1}{2^2} + 3\\cdot \\frac{1}{2^3} + \\ldots = 2$$$."}, "src_uid": "ff810b16b6f41d57c1c8241ad960cba0"}
{"nl": {"description": "Imp likes his plush toy a lot.  Recently, he found a machine that can clone plush toys. Imp knows that if he applies the machine to an original toy, he additionally gets one more original toy and one copy, and if he applies the machine to a copied toy, he gets two additional copies.Initially, Imp has only one original toy. He wants to know if it is possible to use machine to get exactly x copied toys and y original toys? He can't throw toys away, and he can't apply the machine to a copy if he doesn't currently have any copies.", "input_spec": "The only line contains two integers x and y (0\u2009\u2264\u2009x,\u2009y\u2009\u2264\u2009109)\u00a0\u2014 the number of copies and the number of original toys Imp wants to get (including the initial one).", "output_spec": "Print \"Yes\", if the desired configuration is possible, and \"No\" otherwise. You can print each letter in arbitrary case (upper or lower).", "sample_inputs": ["6 3", "4 2", "1000 1001"], "sample_outputs": ["Yes", "No", "Yes"], "notes": "NoteIn the first example, Imp has to apply the machine twice to original toys and then twice to copies."}, "src_uid": "1527171297a0b9c5adf356a549f313b9"}
{"nl": {"description": "Buses run between the cities A and B, the first one is at 05:00 AM and the last one departs not later than at 11:59 PM. A bus from the city A departs every a minutes and arrives to the city B in a ta minutes, and a bus from the city B departs every b minutes and arrives to the city A in a tb minutes.The driver Simion wants to make his job diverse, so he counts the buses going towards him. Simion doesn't count the buses he meet at the start and finish.You know the time when Simion departed from the city A to the city B. Calculate the number of buses Simion will meet to be sure in his counting.", "input_spec": "The first line contains two integers a,\u2009ta (1\u2009\u2264\u2009a,\u2009ta\u2009\u2264\u2009120) \u2014 the frequency of the buses from the city A to the city B and the travel time. Both values are given in minutes. The second line contains two integers b,\u2009tb (1\u2009\u2264\u2009b,\u2009tb\u2009\u2264\u2009120) \u2014 the frequency of the buses from the city B to the city A and the travel time. Both values are given in minutes. The last line contains the departure time of Simion from the city A in the format hh:mm. It is guaranteed that there are a bus from the city A at that time. Note that the hours and the minutes are given with exactly two digits.", "output_spec": "Print the only integer z \u2014 the number of buses Simion will meet on the way. Note that you should not count the encounters in cities A and B.", "sample_inputs": ["10 30\n10 35\n05:20", "60 120\n24 100\n13:00"], "sample_outputs": ["5", "9"], "notes": "NoteIn the first example Simion departs form the city A at 05:20 AM and arrives to the city B at 05:50 AM. He will meet the first 5 buses from the city B that departed in the period [05:00 AM - 05:40 AM]. Also Simion will meet a bus in the city B at 05:50 AM, but he will not count it.Also note that the first encounter will be between 05:26 AM and 05:27 AM (if we suggest that the buses are go with the sustained speed)."}, "src_uid": "1c4cf1c3cb464a483511a8a61f8685a7"}
{"nl": {"description": "Victor tries to write his own text editor, with word correction included. However, the rules of word correction are really strange.Victor thinks that if a word contains two consecutive vowels, then it's kinda weird and it needs to be replaced. So the word corrector works in such a way: as long as there are two consecutive vowels in the word, it deletes the first vowel in a word such that there is another vowel right before it. If there are no two consecutive vowels in the word, it is considered to be correct.You are given a word s. Can you predict what will it become after correction?In this problem letters a, e, i, o, u and y are considered to be vowels.", "input_spec": "The first line contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of letters in word s before the correction. The second line contains a string s consisting of exactly n lowercase Latin letters \u2014 the word before the correction.", "output_spec": "Output the word s after the correction.", "sample_inputs": ["5\nweird", "4\nword", "5\naaeaa"], "sample_outputs": ["werd", "word", "a"], "notes": "NoteExplanations of the examples:  There is only one replace: weird  werd; No replace needed since there are no two consecutive vowels; aaeaa  aeaa  aaa  aa  a. "}, "src_uid": "63a4a5795d94f698b0912bb8d4cdf690"}
{"nl": {"description": "In this task Anna and Maria play the following game. Initially they have a checkered piece of paper with a painted n\u2009\u00d7\u2009m rectangle (only the border, no filling). Anna and Maria move in turns and Anna starts. During each move one should paint inside the last-painted rectangle a new lesser rectangle (along the grid lines). The new rectangle should have no common points with the previous one. Note that when we paint a rectangle, we always paint only the border, the rectangles aren't filled.Nobody wins the game \u2014 Anna and Maria simply play until they have done k moves in total. Count the number of different ways to play this game.", "input_spec": "The first and only line contains three integers: n,\u2009m,\u2009k (1\u2009\u2264\u2009n,\u2009m,\u2009k\u2009\u2264\u20091000).", "output_spec": "Print the single number \u2014 the number of the ways to play the game. As this number can be very big, print the value modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["3 3 1", "4 4 1", "6 7 2"], "sample_outputs": ["1", "9", "75"], "notes": "NoteTwo ways to play the game are considered different if the final pictures are different. In other words, if one way contains a rectangle that is not contained in the other way.In the first sample Anna, who performs her first and only move, has only one possible action plan \u2014 insert a 1\u2009\u00d7\u20091 square inside the given 3\u2009\u00d7\u20093 square.In the second sample Anna has as much as 9 variants: 4 ways to paint a 1\u2009\u00d7\u20091 square, 2 ways to insert a 1\u2009\u00d7\u20092 rectangle vertically, 2 more ways to insert it horizontally and one more way is to insert a 2\u2009\u00d7\u20092 square."}, "src_uid": "309d2d46086d526d160292717dfef308"}
{"nl": {"description": "One day, $$$n$$$ people ($$$n$$$ is an even number) met on a plaza and made two round dances, each round dance consists of exactly $$$\\frac{n}{2}$$$ people. Your task is to find the number of ways $$$n$$$ people can make two round dances if each round dance consists of exactly $$$\\frac{n}{2}$$$ people. Each person should belong to exactly one of these two round dances.Round dance is a dance circle consisting of $$$1$$$ or more people. Two round dances are indistinguishable (equal) if one can be transformed to another by choosing the first participant. For example, round dances $$$[1, 3, 4, 2]$$$, $$$[4, 2, 1, 3]$$$ and $$$[2, 1, 3, 4]$$$ are indistinguishable.For example, if $$$n=2$$$ then the number of ways is $$$1$$$: one round dance consists of the first person and the second one of the second person.For example, if $$$n=4$$$ then the number of ways is $$$3$$$. Possible options:  one round dance \u2014 $$$[1,2]$$$, another \u2014 $$$[3,4]$$$;  one round dance \u2014 $$$[2,4]$$$, another \u2014 $$$[3,1]$$$;  one round dance \u2014 $$$[4,1]$$$, another \u2014 $$$[3,2]$$$. Your task is to find the number of ways $$$n$$$ people can make two round dances if each round dance consists of exactly $$$\\frac{n}{2}$$$ people.", "input_spec": "The input contains one integer $$$n$$$ ($$$2 \\le n \\le 20$$$), $$$n$$$ is an even number.", "output_spec": "Print one integer \u2014 the number of ways to make two round dances. It is guaranteed that the answer fits in the $$$64$$$-bit integer data type.", "sample_inputs": ["2", "4", "8", "20"], "sample_outputs": ["1", "3", "1260", "12164510040883200"], "notes": null}, "src_uid": "ad0985c56a207f76afa2ecd642f56728"}
{"nl": {"description": "Eighth-grader Vova is on duty today in the class. After classes, he went into the office to wash the board, and found on it the number n. He asked what is this number and the teacher of mathematics Inna Petrovna answered Vova that n is the answer to the arithmetic task for first-graders. In the textbook, a certain positive integer x was given. The task was to add x to the sum of the digits of the number x written in decimal numeral system.Since the number n on the board was small, Vova quickly guessed which x could be in the textbook. Now he wants to get a program which will search for arbitrary values of the number n for all suitable values of x or determine that such x does not exist. Write such a program for Vova.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009109).", "output_spec": "In the first line print one integer k\u00a0\u2014 number of different values of x satisfying the condition.  In next k lines print these values in ascending order.", "sample_inputs": ["21", "20"], "sample_outputs": ["1\n15", "0"], "notes": "NoteIn the first test case x\u2009=\u200915 there is only one variant: 15\u2009+\u20091\u2009+\u20095\u2009=\u200921.In the second test case there are no such x."}, "src_uid": "ae20ae2a16273a0d379932d6e973f878"}
{"nl": {"description": "Where do odds begin, and where do they end? Where does hope emerge, and will they ever break?Given an integer sequence a1,\u2009a2,\u2009...,\u2009an of length n. Decide whether it is possible to divide it into an odd number of non-empty subsegments, the each of which has an odd length and begins and ends with odd numbers.A subsegment is a contiguous slice of the whole sequence. For example, {3,\u20094,\u20095} and {1} are subsegments of sequence {1,\u20092,\u20093,\u20094,\u20095,\u20096}, while {1,\u20092,\u20094} and {7} are not.", "input_spec": "The first line of input contains a non-negative integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the length of the sequence. The second line contains n space-separated non-negative integers a1,\u2009a2,\u2009...,\u2009an (0\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 the elements of the sequence.", "output_spec": "Output \"Yes\" if it's possible to fulfill the requirements, and \"No\" otherwise. You can output each letter in any case (upper or lower).", "sample_inputs": ["3\n1 3 5", "5\n1 0 1 5 1", "3\n4 3 1", "4\n3 9 9 3"], "sample_outputs": ["Yes", "Yes", "No", "No"], "notes": "NoteIn the first example, divide the sequence into 1 subsegment: {1,\u20093,\u20095} and the requirements will be met.In the second example, divide the sequence into 3 subsegments: {1,\u20090,\u20091}, {5}, {1}.In the third example, one of the subsegments must start with 4 which is an even number, thus the requirements cannot be met.In the fourth example, the sequence can be divided into 2 subsegments: {3,\u20099,\u20099}, {3}, but this is not a valid solution because 2 is an even number."}, "src_uid": "2b8c2deb5d7e49e8e3ededabfd4427db"}
{"nl": {"description": "The hero of our story, Valera, and his best friend Arcady are still in school, and therefore they spend all the free time playing turn-based strategy \"GAGA: Go And Go Again\". The gameplay is as follows. There are two armies on the playing field each of which consists of n men (n is always even). The current player specifies for each of her soldiers an enemy's soldier he will shoot (a target) and then all the player's soldiers shot simultaneously. This is a game world, and so each soldier shoots perfectly, that is he absolutely always hits the specified target. If an enemy soldier is hit, he will surely die. It may happen that several soldiers had been indicated the same target. Killed soldiers do not participate in the game anymore. The game \"GAGA\" consists of three steps: first Valera makes a move, then Arcady, then Valera again and the game ends. You are asked to calculate the maximum total number of soldiers that may be killed during the game. ", "input_spec": "The input data consist of a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009108, n is even). Please note that before the game starts there are 2n soldiers on the fields. ", "output_spec": "Print a single number \u2014 a maximum total number of soldiers that could be killed in the course of the game in three turns.", "sample_inputs": ["2", "4"], "sample_outputs": ["3", "6"], "notes": "NoteThe first sample test:1) Valera's soldiers 1 and 2 shoot at Arcady's soldier 1.2) Arcady's soldier 2 shoots at Valera's soldier 1.3) Valera's soldier 1 shoots at Arcady's soldier 2.There are 3 soldiers killed in total: Valera's soldier 1 and Arcady's soldiers 1 and 2."}, "src_uid": "031e53952e76cff8fdc0988bb0d3239c"}
{"nl": {"description": "Ivan has number $$$b$$$. He is sorting through the numbers $$$a$$$ from $$$1$$$ to $$$10^{18}$$$, and for every $$$a$$$ writes $$$\\frac{[a, \\,\\, b]}{a}$$$ on blackboard. Here $$$[a, \\,\\, b]$$$ stands for least common multiple of $$$a$$$ and $$$b$$$. Ivan is very lazy, that's why this task bored him soon. But he is interested in how many different numbers he would write on the board if he would finish the task. Help him to find the quantity of different numbers he would write on the board.", "input_spec": "The only line contains one integer\u00a0\u2014 $$$b$$$ $$$(1 \\le b \\le 10^{10})$$$.", "output_spec": "Print one number\u00a0\u2014 answer for the problem.", "sample_inputs": ["1", "2"], "sample_outputs": ["1", "2"], "notes": "NoteIn the first example $$$[a, \\,\\, 1] = a$$$, therefore $$$\\frac{[a, \\,\\, b]}{a}$$$ is always equal to $$$1$$$.In the second example $$$[a, \\,\\, 2]$$$ can be equal to $$$a$$$ or $$$2 \\cdot a$$$ depending on parity of $$$a$$$. $$$\\frac{[a, \\,\\, b]}{a}$$$ can be equal to $$$1$$$ and $$$2$$$."}, "src_uid": "7fc9e7d7e25ab97d8ebc10ed8ae38fd1"}
{"nl": {"description": "Tomorrow Peter has a Biology exam. He does not like this subject much, but d days ago he learnt that he would have to take this exam. Peter's strict parents made him prepare for the exam immediately, for this purpose he has to study not less than minTimei and not more than maxTimei hours per each i-th day. Moreover, they warned Peter that a day before the exam they would check how he has followed their instructions.So, today is the day when Peter's parents ask him to show the timetable of his preparatory studies. But the boy has counted only the sum of hours sumTime spent him on preparation, and now he wants to know if he can show his parents a timetable s\u0441hedule with d numbers, where each number s\u0441hedulei stands for the time in hours spent by Peter each i-th day on biology studies, and satisfying the limitations imposed by his parents, and at the same time the sum total of all schedulei should equal to sumTime.", "input_spec": "The first input line contains two integer numbers d,\u2009sumTime (1\u2009\u2264\u2009d\u2009\u2264\u200930,\u20090\u2009\u2264\u2009sumTime\u2009\u2264\u2009240) \u2014 the amount of days, during which Peter studied, and the total amount of hours, spent on preparation. Each of the following d lines contains two integer numbers minTimei,\u2009maxTimei (0\u2009\u2264\u2009minTimei\u2009\u2264\u2009maxTimei\u2009\u2264\u20098), separated by a space \u2014 minimum and maximum amount of hours that Peter could spent in the i-th day.", "output_spec": "In the first line print YES, and in the second line print d numbers (separated by a space), each of the numbers \u2014 amount of hours, spent by Peter on preparation in the corresponding day, if he followed his parents' instructions; or print NO in the unique line. If there are many solutions, print any of them.", "sample_inputs": ["1 48\n5 7", "2 5\n0 1\n3 5"], "sample_outputs": ["NO", "YES\n1 4"], "notes": null}, "src_uid": "f48ff06e65b70f49eee3d7cba5a6aed0"}
{"nl": {"description": "The Little Elephant loves numbers. He has a positive integer x. The Little Elephant wants to find the number of positive integers d, such that d is the divisor of x, and x and d have at least one common (the same) digit in their decimal representations. Help the Little Elephant to find the described number.", "input_spec": "A single line contains a single integer x (1\u2009\u2264\u2009x\u2009\u2264\u2009109).", "output_spec": "In a single line print an integer \u2014 the answer to the problem.", "sample_inputs": ["1", "10"], "sample_outputs": ["1", "2"], "notes": null}, "src_uid": "ada94770281765f54ab264b4a1ef766e"}
{"nl": {"description": "Pasha has a positive integer a without leading zeroes. Today he decided that the number is too small and he should make it larger. Unfortunately, the only operation Pasha can do is to swap two adjacent decimal digits of the integer.Help Pasha count the maximum number he can get if he has the time to make at most k swaps.", "input_spec": "The single line contains two integers a and k (1\u2009\u2264\u2009a\u2009\u2264\u20091018;\u00a00\u2009\u2264\u2009k\u2009\u2264\u2009100).", "output_spec": "Print the maximum number that Pasha can get if he makes at most k swaps.", "sample_inputs": ["1990 1", "300 0", "1034 2", "9090000078001234 6"], "sample_outputs": ["9190", "300", "3104", "9907000008001234"], "notes": null}, "src_uid": "e56f6c343167745821f0b18dcf0d0cde"}
{"nl": {"description": "There are three points marked on the coordinate plane. The goal is to make a simple polyline, without self-intersections and self-touches, such that it passes through all these points. Also, the polyline must consist of only segments parallel to the coordinate axes. You are to find the minimum number of segments this polyline may consist of.", "input_spec": "Each of the three lines of the input contains two integers. The i-th line contains integers xi and yi (\u2009-\u2009109\u2009\u2264\u2009xi,\u2009yi\u2009\u2264\u2009109)\u00a0\u2014 the coordinates of the i-th point. It is guaranteed that all points are distinct.", "output_spec": "Print a single number\u00a0\u2014 the minimum possible number of segments of the polyline.", "sample_inputs": ["1 -1\n1 1\n1 2", "-1 -1\n-1 3\n4 3", "1 1\n2 3\n3 2"], "sample_outputs": ["1", "2", "3"], "notes": "NoteThe variant of the polyline in the first sample:  The variant of the polyline in the second sample:  The variant of the polyline in the third sample: "}, "src_uid": "36fe960550e59b046202b5811343590d"}
{"nl": {"description": "To celebrate the second ABBYY Cup tournament, the Smart Beaver decided to throw a party. The Beaver has a lot of acquaintances, some of them are friends with each other, and some of them dislike each other. To make party successful, the Smart Beaver wants to invite only those of his friends who are connected by friendship relations, and not to invite those who dislike each other. Both friendship and dislike are mutual feelings.More formally, for each invited person the following conditions should be fulfilled:   all his friends should also be invited to the party;  the party shouldn't have any people he dislikes;  all people who are invited to the party should be connected with him by friendship either directly or through a chain of common friends of arbitrary length. We'll say that people a1 and ap are connected through a chain of common friends if there exists a sequence of people a2,\u2009a3,\u2009...,\u2009ap\u2009-\u20091 such that all pairs of people ai and ai\u2009+\u20091 (1\u2009\u2264\u2009i\u2009<\u2009p) are friends. Help the Beaver find the maximum number of acquaintances he can invite.", "input_spec": "The first line of input contains an integer n \u2014 the number of the Beaver's acquaintances.  The second line contains an integer k  \u2014 the number of pairs of friends. Next k lines contain space-separated pairs of integers ui,\u2009vi  \u2014 indices of people who form the i-th pair of friends. The next line contains an integer m  \u2014 the number of pairs of people who dislike each other. Next m lines describe pairs of people who dislike each other in the same format as the pairs of friends were described. Each pair of people is mentioned in the input at most once . In particular, two persons cannot be friends and dislike each other at the same time. The input limitations for getting 30 points are:    2\u2009\u2264\u2009n\u2009\u2264\u200914  The input limitations for getting 100 points are:    2\u2009\u2264\u2009n\u2009\u2264\u20092000 ", "output_spec": "Output a single number \u2014 the maximum number of people that can be invited to the party. If a group of people that meets all the requirements is impossible to select, output 0.", "sample_inputs": ["9\n8\n1 2\n1 3\n2 3\n4 5\n6 7\n7 8\n8 9\n9 6\n2\n1 6\n7 9"], "sample_outputs": ["3"], "notes": "NoteLet's have a look at the example.   Two groups of people can be invited: {1,\u20092,\u20093} and {4,\u20095}, thus the answer will be the size of the largest of these groups. Group {6,\u20097,\u20098,\u20099} doesn't fit, since it includes people 7 and 9 who dislike each other. Group {1,\u20092,\u20093,\u20094,\u20095} also doesn't fit, because not all of its members are connected by a chain of common friends (for example, people 2 and 5 aren't connected)."}, "src_uid": "e1ebaf64b129edb8089f9e2f89a0e1e1"}
{"nl": {"description": "Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.One day Petya was delivered a string s, containing only digits. He needs to find a string that represents a lucky number without leading zeroes, is not empty, is contained in s as a substring the maximum number of times.Among all the strings for which the three conditions given above are fulfilled, Petya only needs the lexicographically minimum one. Find this string for Petya.", "input_spec": "The single line contains a non-empty string s whose length can range from 1 to 50, inclusive. The string only contains digits. The string can contain leading zeroes.", "output_spec": "In the only line print the answer to Petya's problem. If the sought string does not exist, print \"-1\" (without quotes).", "sample_inputs": ["047", "16", "472747"], "sample_outputs": ["4", "-1", "7"], "notes": "NoteThe lexicographical comparison of strings is performed by the < operator in the modern programming languages. String x is lexicographically less than string y either if x is a prefix of y, or exists such i (1\u2009\u2264\u2009i\u2009\u2264\u2009min(|x|,\u2009|y|)), that xi\u2009<\u2009yi and for any j (1\u2009\u2264\u2009j\u2009<\u2009i) xj\u2009=\u2009yj. Here |a| denotes the length of string a.In the first sample three conditions are fulfilled for strings \"4\", \"7\" and \"47\". The lexicographically minimum one is \"4\".In the second sample s has no substrings which are lucky numbers.In the third sample the three conditions are only fulfilled for string \"7\"."}, "src_uid": "639b8b8d0dc42df46b139f0aeb3a7a0a"}
{"nl": {"description": "Given a positive integer n, find k integers (not necessary distinct) such that all these integers are strictly greater than 1, and their product is equal to n.", "input_spec": "The first line contains two integers n and k (2\u2009\u2264\u2009n\u2009\u2264\u2009100000, 1\u2009\u2264\u2009k\u2009\u2264\u200920).", "output_spec": "If it's impossible to find the representation of n as a product of k numbers, print -1. Otherwise, print k integers in any order. Their product must be equal to n. If there are multiple answers, print any of them.", "sample_inputs": ["100000 2", "100000 20", "1024 5"], "sample_outputs": ["2 50000", "-1", "2 64 2 2 2"], "notes": null}, "src_uid": "bd0bc809d52e0a17da07ccfd450a4d79"}
{"nl": {"description": "George woke up and saw the current time s on the digital clock. Besides, George knows that he has slept for time t. Help George! Write a program that will, given time s and t, determine the time p when George went to bed. Note that George could have gone to bed yesterday relatively to the current time (see the second test sample). ", "input_spec": "The first line contains current time s as a string in the format \"hh:mm\". The second line contains time t in the format \"hh:mm\" \u2014 the duration of George's sleep. It is guaranteed that the input contains the correct time in the 24-hour format, that is, 00\u2009\u2264\u2009hh\u2009\u2264\u200923, 00\u2009\u2264\u2009mm\u2009\u2264\u200959.", "output_spec": "In the single line print time p \u2014 the time George went to bed in the format similar to the format of the time in the input.", "sample_inputs": ["05:50\n05:44", "00:00\n01:00", "00:01\n00:00"], "sample_outputs": ["00:06", "23:00", "00:01"], "notes": "NoteIn the first sample George went to bed at \"00:06\". Note that you should print the time only in the format \"00:06\". That's why answers \"0:06\", \"00:6\" and others will be considered incorrect. In the second sample, George went to bed yesterday.In the third sample, George didn't do to bed at all."}, "src_uid": "595c4a628c261104c8eedad767e85775"}
{"nl": {"description": "Let us call a pair of integer numbers m-perfect, if at least one number in the pair is greater than or equal to m. Thus, the pairs (3, 3) and (0, 2) are 2-perfect while the pair (-1, 1) is not.Two integers x, y are written on the blackboard. It is allowed to erase one of them and replace it with the sum of the numbers, (x\u2009+\u2009y).What is the minimum number of such operations one has to perform in order to make the given pair of integers m-perfect?", "input_spec": "Single line of the input contains three integers x, y and m (\u2009-\u20091018\u2009\u2264\u2009x, y, m\u2009\u2264\u20091018). Please, do not use the %lld specifier to read or write 64-bit integers in C++. It is preffered to use the cin, cout streams or the %I64d specifier.", "output_spec": "Print the minimum number of operations or \"-1\" (without quotes), if it is impossible to transform the given pair to the m-perfect one.", "sample_inputs": ["1 2 5", "-1 4 15", "0 -1 5"], "sample_outputs": ["2", "4", "-1"], "notes": "NoteIn the first sample the following sequence of operations is suitable: (1, 2)  (3, 2)  (5, 2).In the second sample: (-1, 4)  (3, 4)  (7, 4)  (11, 4)  (15, 4).Finally, in the third sample x, y cannot be made positive, hence there is no proper sequence of operations."}, "src_uid": "82026a3c3d9a6bda2e2ac6e14979d821"}
{"nl": {"description": "Bear Limak prepares problems for a programming competition. Of course, it would be unprofessional to mention the sponsor name in the statement. Limak takes it seriously and he is going to change some words. To make it still possible to read, he will try to modify each word as little as possible.Limak has a string s that consists of uppercase English letters. In one move he can swap two adjacent letters of the string. For example, he can transform a string \"ABBC\" into \"BABC\" or \"ABCB\" in one move.Limak wants to obtain a string without a substring \"VK\" (i.e. there should be no letter 'V' immediately followed by letter 'K'). It can be easily proved that it's possible for any initial string s.What is the minimum possible number of moves Limak can do?", "input_spec": "The first line of the input contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u200975)\u00a0\u2014 the length of the string. The second line contains a string s, consisting of uppercase English letters. The length of the string is equal to n.", "output_spec": "Print one integer, denoting the minimum possible number of moves Limak can do, in order to obtain a string without a substring \"VK\".", "sample_inputs": ["4\nVKVK", "5\nBVVKV", "7\nVVKEVKK", "20\nVKVKVVVKVOVKVQKKKVVK", "5\nLIMAK"], "sample_outputs": ["3", "2", "3", "8", "0"], "notes": "NoteIn the first sample, the initial string is \"VKVK\". The minimum possible number of moves is 3. One optimal sequence of moves is: Swap two last letters. The string becomes \"VKKV\". Swap first two letters. The string becomes \"KVKV\". Swap the second and the third letter. The string becomes \"KKVV\". Indeed, this string doesn't have a substring \"VK\".In the second sample, there are two optimal sequences of moves. One is \"BVVKV\"\u2009\u2009\u2192\u2009\u2009\"VBVKV\"\u2009\u2009\u2192\u2009\u2009\"VVBKV\". The other is \"BVVKV\"\u2009\u2009\u2192\u2009\u2009\"BVKVV\"\u2009\u2009\u2192\u2009\u2009\"BKVVV\".In the fifth sample, no swaps are necessary."}, "src_uid": "08444f9ab1718270b5ade46852b155d7"}
{"nl": {"description": "Vasya has found a strange device. On the front panel of a device there are: a red button, a blue button and a display showing some positive integer. After clicking the red button, device multiplies the displayed number by two. After clicking the blue button, device subtracts one from the number on the display. If at some point the number stops being positive, the device breaks down. The display can show arbitrarily large numbers. Initially, the display shows number n.Bob wants to get number m on the display. What minimum number of clicks he has to make in order to achieve this result?", "input_spec": "The first and the only line of the input contains two distinct integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009104), separated by a space .", "output_spec": "Print a single number \u2014 the minimum number of times one needs to push the button required to get the number m out of number n.", "sample_inputs": ["4 6", "10 1"], "sample_outputs": ["2", "9"], "notes": "NoteIn the first example you need to push the blue button once, and then push the red button once.In the second example, doubling the number is unnecessary, so we need to push the blue button nine times."}, "src_uid": "861f8edd2813d6d3a5ff7193a804486f"}
{"nl": {"description": "Imp is in a magic forest, where xorangles grow (wut?)  A xorangle of order n is such a non-degenerate triangle, that lengths of its sides are integers not exceeding n, and the xor-sum of the lengths is equal to zero. Imp has to count the number of distinct xorangles of order n to get out of the forest. Formally, for a given integer n you have to find the number of such triples (a,\u2009b,\u2009c), that:  1\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u2009c\u2009\u2264\u2009n;  , where  denotes the bitwise xor of integers x and y.  (a,\u2009b,\u2009c) form a non-degenerate (with strictly positive area) triangle. ", "input_spec": "The only line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20092500).", "output_spec": "Print the number of xorangles of order n.", "sample_inputs": ["6", "10"], "sample_outputs": ["1", "2"], "notes": "NoteThe only xorangle in the first sample is (3,\u20095,\u20096)."}, "src_uid": "838f2e75fdff0f13f002c0dfff0b2e8d"}
{"nl": {"description": "InputThe input contains a single integer a (1\u2009\u2264\u2009a\u2009\u2264\u200964).OutputOutput a single integer.ExamplesInput2Output1Input4Output2Input27Output5Input42Output6", "input_spec": "The input contains a single integer a (1\u2009\u2264\u2009a\u2009\u2264\u200964).", "output_spec": "Output a single integer.", "sample_inputs": ["2", "4", "27", "42"], "sample_outputs": ["1", "2", "5", "6"], "notes": null}, "src_uid": "c50b6af99ca7b9c35628b52774d6c32b"}
{"nl": {"description": "Little Petya loves training spiders. Petya has a board n\u2009\u00d7\u2009m in size. Each cell of the board initially has a spider sitting on it. After one second Petya chooses a certain action for each spider, and all of them humbly perform its commands. There are 5 possible commands: to stay idle or to move from current cell to some of the four side-neighboring cells (that is, one command for each of the four possible directions). Petya gives the commands so that no spider leaves the field. It is allowed for spiders to pass through each other when they crawl towards each other in opposite directions. All spiders crawl simultaneously and several spiders may end up in one cell. Petya wants to know the maximum possible number of spider-free cells after one second.", "input_spec": "The first line contains two space-separated integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200940,\u2009n\u00b7m\u2009\u2264\u200940) \u2014 the board sizes.", "output_spec": "In the first line print the maximum number of cells without spiders.", "sample_inputs": ["1 1", "2 3"], "sample_outputs": ["0", "4"], "notes": "NoteIn the first sample the only possible answer is:sIn the second sample one of the possible solutions is: rdlruls denotes command \"stay idle\", l, r, d, u denote commands \"crawl left\", \"crawl right\", \"crawl down\", \"crawl up\", correspondingly."}, "src_uid": "097674b4dd696b30e102938f71dd39b9"}
{"nl": {"description": "You are given an alphabet consisting of n letters, your task is to make a string of the maximum possible length so that the following conditions are satisfied:   the i-th letter occurs in the string no more than ai times;  the number of occurrences of each letter in the string must be distinct for all the letters that occurred in the string at least once. ", "input_spec": "The first line of the input contains a single integer n (2\u2009\u2009\u2264\u2009\u2009n\u2009\u2009\u2264\u2009\u200926)\u00a0\u2014 the number of letters in the alphabet. The next line contains n integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009109)\u00a0\u2014 i-th of these integers gives the limitation on the number of occurrences of the i-th character in the string.", "output_spec": "Print a single integer \u2014 the maximum length of the string that meets all the requirements.", "sample_inputs": ["3\n2 5 5", "3\n1 1 2"], "sample_outputs": ["11", "3"], "notes": "NoteFor convenience let's consider an alphabet consisting of three letters: \"a\", \"b\", \"c\". In the first sample, some of the optimal strings are: \"cccaabbccbb\", \"aabcbcbcbcb\". In the second sample some of the optimal strings are: \"acc\", \"cbc\"."}, "src_uid": "3c4b2d1c9440515bc3002eddd2b89f6f"}
{"nl": {"description": "Maxim loves to fill in a matrix in a special manner. Here is a pseudocode of filling in a matrix of size (m\u2009+\u20091)\u2009\u00d7\u2009(m\u2009+\u20091):Maxim asks you to count, how many numbers m (1\u2009\u2264\u2009m\u2009\u2264\u2009n) are there, such that the sum of values in the cells in the row number m\u2009+\u20091 of the resulting matrix equals t.Expression (x xor y) means applying the operation of bitwise excluding \"OR\" to numbers x and y. The given operation exists in all modern programming languages. For example, in languages C++ and Java it is represented by character \"^\", in Pascal \u2014 by \"xor\".", "input_spec": "A single line contains two integers n and t (1\u2009\u2264\u2009n,\u2009t\u2009\u2264\u20091012,\u2009t\u2009\u2264\u2009n\u2009+\u20091). Please, do not use the %lld specifier to read or write 64-bit integers in C++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "In a single line print a single integer \u2014 the answer to the problem. ", "sample_inputs": ["1 1", "3 2", "3 3", "1000000000000 1048576"], "sample_outputs": ["1", "1", "0", "118606527258"], "notes": null}, "src_uid": "727d5b601694e5e0f0cf3a9ca25323fc"}
{"nl": {"description": "Little boy Valera studies an algorithm of sorting an integer array. After studying the theory, he went on to the practical tasks. As a result, he wrote a program that sorts an array of n integers a1,\u2009a2,\u2009...,\u2009an in the non-decreasing order. The pseudocode of the program, written by Valera, is given below. The input of the program gets number n and array a.loop integer variable i from 1 to n\u2009-\u20091\u00a0\u00a0\u00a0\u00a0loop integer variable j from i to n\u2009-\u20091\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (aj\u2009>\u2009aj\u2009+\u20091), then swap the values of elements aj and aj\u2009+\u20091But Valera could have made a mistake, because he hasn't yet fully learned the sorting algorithm. If Valera made a mistake in his program, you need to give a counter-example that makes his program work improperly (that is, the example that makes the program sort the array not in the non-decreasing order). If such example for the given value of n doesn't exist, print -1.", "input_spec": "You've got a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950) \u2014 the size of the sorted array.", "output_spec": "Print n space-separated integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 the counter-example, for which Valera's algorithm won't work correctly. If the counter-example that meets the described conditions is impossible to give, print -1. If there are several counter-examples, consisting of n numbers, you are allowed to print any of them.", "sample_inputs": ["1"], "sample_outputs": ["-1"], "notes": null}, "src_uid": "fe8a0332119bd182a0a5b7758716317e"}
{"nl": {"description": "You are given a square board, consisting of $$$n$$$ rows and $$$n$$$ columns. Each tile in it should be colored either white or black.Let's call some coloring beautiful if each pair of adjacent rows are either the same or different in every position. The same condition should be held for the columns as well.Let's call some coloring suitable if it is beautiful and there is no rectangle of the single color, consisting of at least $$$k$$$ tiles.Your task is to count the number of suitable colorings of the board of the given size.Since the answer can be very large, print it modulo $$$998244353$$$.", "input_spec": "A single line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 500$$$, $$$1 \\le k \\le n^2$$$) \u2014 the number of rows and columns of the board and the maximum number of tiles inside the rectangle of the single color, respectively.", "output_spec": "Print a single integer \u2014 the number of suitable colorings of the board of the given size modulo $$$998244353$$$.", "sample_inputs": ["1 1", "2 3", "49 1808"], "sample_outputs": ["0", "6", "359087121"], "notes": "NoteBoard of size $$$1 \\times 1$$$ is either a single black tile or a single white tile. Both of them include a rectangle of a single color, consisting of $$$1$$$ tile.Here are the beautiful colorings of a board of size $$$2 \\times 2$$$ that don't include rectangles of a single color, consisting of at least $$$3$$$ tiles:  The rest of beautiful colorings of a board of size $$$2 \\times 2$$$ are the following:  "}, "src_uid": "77177b1a2faf0ba4ca1f4d77632b635b"}
{"nl": {"description": "Bear Limak wants to become the largest of bears, or at least to become larger than his brother Bob.Right now, Limak and Bob weigh a and b respectively. It's guaranteed that Limak's weight is smaller than or equal to his brother's weight.Limak eats a lot and his weight is tripled after every year, while Bob's weight is doubled after every year.After how many full years will Limak become strictly larger (strictly heavier) than Bob?", "input_spec": "The only line of the input contains two integers a and b (1\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u200910)\u00a0\u2014 the weight of Limak and the weight of Bob respectively.", "output_spec": "Print one integer, denoting the integer number of years after which Limak will become strictly larger than Bob.", "sample_inputs": ["4 7", "4 9", "1 1"], "sample_outputs": ["2", "3", "1"], "notes": "NoteIn the first sample, Limak weighs 4 and Bob weighs 7 initially. After one year their weights are 4\u00b73\u2009=\u200912 and 7\u00b72\u2009=\u200914 respectively (one weight is tripled while the other one is doubled). Limak isn't larger than Bob yet. After the second year weights are 36 and 28, so the first weight is greater than the second one. Limak became larger than Bob after two years so you should print 2.In the second sample, Limak's and Bob's weights in next years are: 12 and 18, then 36 and 36, and finally 108 and 72 (after three years). The answer is 3. Remember that Limak wants to be larger than Bob and he won't be satisfied with equal weights.In the third sample, Limak becomes larger than Bob after the first year. Their weights will be 3 and 2 then."}, "src_uid": "a1583b07a9d093e887f73cc5c29e444a"}
{"nl": {"description": "Several ages ago Berland was a kingdom. The King of Berland adored math. That's why, when he first visited one of his many palaces, he first of all paid attention to the floor in one hall. The floor was tiled with hexagonal tiles.The hall also turned out hexagonal in its shape. The King walked along the perimeter of the hall and concluded that each of the six sides has a, b, c, a, b and c adjacent tiles, correspondingly.To better visualize the situation, look at the picture showing a similar hexagon for a\u2009=\u20092, b\u2009=\u20093 and c\u2009=\u20094.  According to the legend, as the King of Berland obtained the values a, b and c, he almost immediately calculated the total number of tiles on the hall floor. Can you do the same?", "input_spec": "The first line contains three integers: a, b and c (2\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u20091000).", "output_spec": "Print a single number \u2014 the total number of tiles on the hall floor.", "sample_inputs": ["2 3 4"], "sample_outputs": ["18"], "notes": null}, "src_uid": "8ab25ed4955d978fe20f6872cb94b0da"}
{"nl": {"description": "So, the New Year holidays are over. Santa Claus and his colleagues can take a rest and have guests at last. When two \"New Year and Christmas Men\" meet, thear assistants cut out of cardboard the letters from the guest's name and the host's name in honor of this event. Then the hung the letters above the main entrance. One night, when everyone went to bed, someone took all the letters of our characters' names. Then he may have shuffled the letters and put them in one pile in front of the door.The next morning it was impossible to find the culprit who had made the disorder. But everybody wondered whether it is possible to restore the names of the host and his guests from the letters lying at the door? That is, we need to verify that there are no extra letters, and that nobody will need to cut more letters.Help the \"New Year and Christmas Men\" and their friends to cope with this problem. You are given both inscriptions that hung over the front door the previous night, and a pile of letters that were found at the front door next morning.", "input_spec": "The input file consists of three lines: the first line contains the guest's name, the second line contains the name of the residence host and the third line contains letters in a pile that were found at the door in the morning. All lines are not empty and contain only uppercase Latin letters. The length of each line does not exceed 100.", "output_spec": "Print \"YES\" without the quotes, if the letters in the pile could be permuted to make the names of the \"New Year and Christmas Men\". Otherwise, print \"NO\" without the quotes.", "sample_inputs": ["SANTACLAUS\nDEDMOROZ\nSANTAMOROZDEDCLAUS", "PAPAINOEL\nJOULUPUKKI\nJOULNAPAOILELUPUKKI", "BABBONATALE\nFATHERCHRISTMAS\nBABCHRISTMASBONATALLEFATHER"], "sample_outputs": ["YES", "NO", "NO"], "notes": "NoteIn the first sample the letters written in the last line can be used to write the names and there won't be any extra letters left.In the second sample letter \"P\" is missing from the pile and there's an extra letter \"L\".In the third sample there's an extra letter \"L\"."}, "src_uid": "b6456a39d38fabcd25267793ed94d90c"}
{"nl": {"description": "Little Johnny has recently learned about set theory. Now he is studying binary relations. You've probably heard the term \"equivalence relation\". These relations are very important in many areas of mathematics. For example, the equality of the two numbers is an equivalence relation.A set \u03c1 of pairs (a,\u2009b) of elements of some set A is called a binary relation on set A. For two elements a and b of the set A we say that they are in relation \u03c1, if pair , in this case we use a notation .Binary relation is equivalence relation, if: It is reflexive (for any a it is true that ); It is symmetric (for any a, b it is true that if , then ); It is transitive (if  and , than ).Little Johnny is not completely a fool and he noticed that the first condition is not necessary! Here is his \"proof\":Take any two elements, a and b. If , then  (according to property (2)), which means  (according to property (3)).It's very simple, isn't it? However, you noticed that Johnny's \"proof\" is wrong, and decided to show him a lot of examples that prove him wrong.Here's your task: count the number of binary relations over a set of size n such that they are symmetric, transitive, but not an equivalence relations (i.e. they are not reflexive).Since their number may be very large (not 0, according to Little Johnny), print the remainder of integer division of this number by 109\u2009+\u20097.", "input_spec": "A single line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20094000).", "output_spec": "In a single line print the answer to the problem modulo 109\u2009+\u20097.", "sample_inputs": ["1", "2", "3"], "sample_outputs": ["1", "3", "10"], "notes": "NoteIf n\u2009=\u20091 there is only one such relation\u00a0\u2014 an empty one, i.e. . In other words, for a single element x of set A the following is hold: .If n\u2009=\u20092 there are three such relations. Let's assume that set A consists of two elements, x and y. Then the valid relations are , \u03c1\u2009=\u2009{(x,\u2009x)}, \u03c1\u2009=\u2009{(y,\u2009y)}. It is easy to see that the three listed binary relations are symmetric and transitive relations, but they are not equivalence relations."}, "src_uid": "aa2c3e94a44053a0d86f61da06681023"}
{"nl": {"description": "Tokitsukaze is one of the characters in the game \"Kantai Collection\". In this game, every character has a common attribute\u00a0\u2014 health points, shortened to HP.In general, different values of HP are grouped into $$$4$$$ categories:  Category $$$A$$$ if HP is in the form of $$$(4 n + 1)$$$, that is, when divided by $$$4$$$, the remainder is $$$1$$$;  Category $$$B$$$ if HP is in the form of $$$(4 n + 3)$$$, that is, when divided by $$$4$$$, the remainder is $$$3$$$;  Category $$$C$$$ if HP is in the form of $$$(4 n + 2)$$$, that is, when divided by $$$4$$$, the remainder is $$$2$$$;  Category $$$D$$$ if HP is in the form of $$$4 n$$$, that is, when divided by $$$4$$$, the remainder is $$$0$$$. The above-mentioned $$$n$$$ can be any integer.These $$$4$$$ categories ordered from highest to lowest as $$$A > B > C > D$$$, which means category $$$A$$$ is the highest and category $$$D$$$ is the lowest.While playing the game, players can increase the HP of the character. Now, Tokitsukaze wants you to increase her HP by at most $$$2$$$ (that is, either by $$$0$$$, $$$1$$$ or $$$2$$$). How much should she increase her HP so that it has the highest possible category?", "input_spec": "The only line contains a single integer $$$x$$$ ($$$30 \\leq x \\leq 100$$$)\u00a0\u2014 the value Tokitsukaze's HP currently.", "output_spec": "Print an integer $$$a$$$ ($$$0 \\leq a \\leq 2$$$) and an uppercase letter $$$b$$$ ($$$b \\in \\lbrace A, B, C, D \\rbrace$$$), representing that the best way is to increase her HP by $$$a$$$, and then the category becomes $$$b$$$. Note that the output characters are case-sensitive.", "sample_inputs": ["33", "98"], "sample_outputs": ["0 A", "1 B"], "notes": "NoteFor the first example, the category of Tokitsukaze's HP is already $$$A$$$, so you don't need to enhance her ability.For the second example:  If you don't increase her HP, its value is still $$$98$$$, which equals to $$$(4 \\times 24 + 2)$$$, and its category is $$$C$$$.  If you increase her HP by $$$1$$$, its value becomes $$$99$$$, which equals to $$$(4 \\times 24 + 3)$$$, and its category becomes $$$B$$$.  If you increase her HP by $$$2$$$, its value becomes $$$100$$$, which equals to $$$(4 \\times 25)$$$, and its category becomes $$$D$$$. Therefore, the best way is to increase her HP by $$$1$$$ so that the category of her HP becomes $$$B$$$."}, "src_uid": "488e809bd0c55531b0b47f577996627e"}
{"nl": {"description": "The Smart Beaver from ABBYY came up with another splendid problem for the ABBYY Cup participants! This time the Beaver invites the contest participants to check out a problem on sorting documents by their subjects. Let's describe the problem:You've got some training set of documents. For each document you know its subject. The subject in this problem is an integer from 1 to 3. Each of these numbers has a physical meaning. For instance, all documents with subject 3 are about trade.You can download the training set of documents at the following link: http://download4.abbyy.com/a2/X2RZ2ZWXBG5VYWAL61H76ZQM/train.zip. The archive contains three directories with names \"1\", \"2\", \"3\". Directory named \"1\" contains documents on the 1-st subject, directory \"2\" contains documents on the 2-nd subject, and directory \"3\" contains documents on the 3-rd subject. Each document corresponds to exactly one file from some directory.All documents have the following format: the first line contains the document identifier, the second line contains the name of the document, all subsequent lines contain the text of the document. The document identifier is used to make installing the problem more convenient and has no useful information for the participants.You need to write a program that should indicate the subject for a given document. It is guaranteed that all documents given as input to your program correspond to one of the three subjects of the training set.", "input_spec": "The first line contains integer id (0\u2009\u2264\u2009id\u2009\u2264\u2009106) \u2014 the document identifier. The second line contains the name of the document. The third and the subsequent lines contain the text of the document. It is guaranteed that the size of any given document will not exceed 10 kilobytes. The tests for this problem are divided into 10 groups. Documents of groups 1 and 2 are taken from the training set, but their identifiers will not match the identifiers specified in the training set. Groups from the 3-rd to the 10-th are roughly sorted by the author in ascending order of difficulty (these groups contain documents which aren't present in the training set).", "output_spec": "Print an integer from 1 to 3, inclusive \u2014 the number of the subject the given document corresponds to.", "sample_inputs": [], "sample_outputs": [], "notes": null}, "src_uid": "d163975cdad000ce89ee251ef9129779"}
{"nl": {"description": "The stardate is 1977 and the science and art of detecting Death Stars is in its infancy. Princess Heidi has received information about the stars in the nearby solar system from the Rebel spies and now, to help her identify the exact location of the Death Star, she needs to know whether this information is correct. Two rebel spies have provided her with the maps of the solar system. Each map is an N\u2009\u00d7\u2009N grid, where each cell is either occupied by a star or empty. To see whether the information is correct, Heidi needs to know whether the two maps are of the same solar system, or if possibly one of the spies is actually an Empire double agent, feeding her false information.Unfortunately, spies may have accidentally rotated a map by 90, 180, or 270 degrees, or flipped it along the vertical or the horizontal axis, before delivering it to Heidi. If Heidi can rotate or flip the maps so that two of them become identical, then those maps are of the same solar system. Otherwise, there are traitors in the Rebel ranks! Help Heidi find out.", "input_spec": "The first line of the input contains one number N (1\u2009\u2264\u2009N\u2009\u2264\u200910) \u2013 the dimension of each map. Next N lines each contain N characters, depicting the first map: 'X' indicates a star, while 'O' indicates an empty quadrant of space. Next N lines each contain N characters, depicting the second map in the same format.", "output_spec": "The only line of output should contain the word Yes if the maps are identical, or No if it is impossible to match them by performing rotations and translations.", "sample_inputs": ["4\nXOOO\nXXOO\nOOOO\nXXXX\nXOOO\nXOOO\nXOXO\nXOXX", "2\nXX\nOO\nXO\nOX"], "sample_outputs": ["Yes", "No"], "notes": "NoteIn the first test, you can match the first map to the second map by first flipping the first map along the vertical axis, and then by rotating it 90 degrees clockwise. "}, "src_uid": "2e793c9f476d03e8ba7df262db1c06e4"}
{"nl": {"description": "Andrey's favourite number is n. Andrey's friends gave him two identical numbers n as a New Year present. He hung them on a wall and watched them adoringly.Then Andrey got bored from looking at the same number and he started to swap digits first in one, then in the other number, then again in the first number and so on (arbitrary number of changes could be made in each number). At some point it turned out that if we sum the resulting numbers, then the number of zeroes with which the sum will end would be maximum among the possible variants of digit permutations in those numbers.Given number n, can you find the two digit permutations that have this property?", "input_spec": "The first line contains a positive integer n \u2014 the original number. The number of digits in this number does not exceed 105. The number is written without any leading zeroes.", "output_spec": "Print two permutations of digits of number n, such that the sum of these numbers ends with the maximum number of zeroes. The permutations can have leading zeroes (if they are present, they all should be printed). The permutations do not have to be different. If there are several answers, print any of them.", "sample_inputs": ["198", "500"], "sample_outputs": ["981\n819", "500\n500"], "notes": null}, "src_uid": "34b67958a37865e1ca0529bbf528dd9a"}
{"nl": {"description": "You have a positive integer m and a non-negative integer s. Your task is to find the smallest and the largest of the numbers that have length m and sum of digits s. The required numbers should be non-negative integers written in the decimal base without leading zeroes.", "input_spec": "The single line of the input contains a pair of integers m, s (1\u2009\u2264\u2009m\u2009\u2264\u2009100,\u20090\u2009\u2264\u2009s\u2009\u2264\u2009900) \u2014 the length and the sum of the digits of the required numbers.", "output_spec": "In the output print the pair of the required non-negative integer numbers \u2014 first the minimum possible number, then \u2014 the maximum possible number. If no numbers satisfying conditions required exist, print the pair of numbers \"-1 -1\" (without the quotes).", "sample_inputs": ["2 15", "3 0"], "sample_outputs": ["69 96", "-1 -1"], "notes": null}, "src_uid": "75d062cece5a2402920d6706c655cad7"}
{"nl": {"description": "Mashmokh works in a factory. At the end of each day he must turn off all of the lights. The lights on the factory are indexed from 1 to n. There are n buttons in Mashmokh's room indexed from 1 to n as well. If Mashmokh pushes button with index i, then each light with index not less than i that is still turned on turns off.Mashmokh is not very clever. So instead of pushing the first button he pushes some of the buttons randomly each night. He pushed m distinct buttons b1,\u2009b2,\u2009...,\u2009bm (the buttons were pushed consecutively in the given order) this night. Now he wants to know for each light the index of the button that turned this light off. Please note that the index of button bi is actually bi, not i.Please, help Mashmokh, print these indices.", "input_spec": "The first line of the input contains two space-separated integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100), the number of the factory lights and the pushed buttons respectively. The next line contains m distinct space-separated integers b1,\u2009b2,\u2009...,\u2009bm\u00a0(1\u2009\u2264\u2009bi\u2009\u2264\u2009n). It is guaranteed that all lights will be turned off after pushing all buttons.", "output_spec": "Output n space-separated integers where the i-th number is index of the button that turns the i-th light off.", "sample_inputs": ["5 4\n4 3 1 2", "5 5\n5 4 3 2 1"], "sample_outputs": ["1 1 3 4 4", "1 2 3 4 5"], "notes": "NoteIn the first sample, after pressing button number 4, lights 4 and 5 are turned off and lights 1, 2 and 3 are still on. Then after pressing button number 3, light number 3 is turned off as well. Pressing button number 1 turns off lights number 1 and 2 as well so pressing button number 2 in the end has no effect. Thus button number 4 turned lights 4 and 5 off, button number 3 turned light 3 off and button number 1 turned light 1 and 2 off."}, "src_uid": "2e44c8aabab7ef7b06bbab8719a8d863"}
{"nl": {"description": "Consider the following equation:  where sign [a] represents the integer part of number a.Let's find all integer z (z\u2009>\u20090), for which this equation is unsolvable in positive integers. The phrase \"unsolvable in positive integers\" means that there are no such positive integers x and y (x,\u2009y\u2009>\u20090), for which the given above equation holds.Let's write out all such z in the increasing order: z1,\u2009z2,\u2009z3, and so on (zi\u2009<\u2009zi\u2009+\u20091). Your task is: given the number n, find the number zn.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200940).", "output_spec": "Print a single integer \u2014 the number zn modulo 1000000007 (109\u2009+\u20097). It is guaranteed that the answer exists.", "sample_inputs": ["1", "2", "3"], "sample_outputs": ["1", "3", "15"], "notes": null}, "src_uid": "c2cbc35012c6ff7ab0d6899e6015e4e7"}
{"nl": {"description": "The map of Bertown can be represented as a set of $$$n$$$ intersections, numbered from $$$1$$$ to $$$n$$$ and connected by $$$m$$$ one-way roads. It is possible to move along the roads from any intersection to any other intersection. The length of some path from one intersection to another is the number of roads that one has to traverse along the path. The shortest path from one intersection $$$v$$$ to another intersection $$$u$$$ is the path that starts in $$$v$$$, ends in $$$u$$$ and has the minimum length among all such paths.Polycarp lives near the intersection $$$s$$$ and works in a building near the intersection $$$t$$$. Every day he gets from $$$s$$$ to $$$t$$$ by car. Today he has chosen the following path to his workplace: $$$p_1$$$, $$$p_2$$$, ..., $$$p_k$$$, where $$$p_1 = s$$$, $$$p_k = t$$$, and all other elements of this sequence are the intermediate intersections, listed in the order Polycarp arrived at them. Polycarp never arrived at the same intersection twice, so all elements of this sequence are pairwise distinct. Note that you know Polycarp's path beforehand (it is fixed), and it is not necessarily one of the shortest paths from $$$s$$$ to $$$t$$$.Polycarp's car has a complex navigation system installed in it. Let's describe how it works. When Polycarp starts his journey at the intersection $$$s$$$, the system chooses some shortest path from $$$s$$$ to $$$t$$$ and shows it to Polycarp. Let's denote the next intersection in the chosen path as $$$v$$$. If Polycarp chooses to drive along the road from $$$s$$$ to $$$v$$$, then the navigator shows him the same shortest path (obviously, starting from $$$v$$$ as soon as he arrives at this intersection). However, if Polycarp chooses to drive to another intersection $$$w$$$ instead, the navigator rebuilds the path: as soon as Polycarp arrives at $$$w$$$, the navigation system chooses some shortest path from $$$w$$$ to $$$t$$$ and shows it to Polycarp. The same process continues until Polycarp arrives at $$$t$$$: if Polycarp moves along the road recommended by the system, it maintains the shortest path it has already built; but if Polycarp chooses some other path, the system rebuilds the path by the same rules.Here is an example. Suppose the map of Bertown looks as follows, and Polycarp drives along the path $$$[1, 2, 3, 4]$$$ ($$$s = 1$$$, $$$t = 4$$$): Check the picture by the link http://tk.codeforces.com/a.png   When Polycarp starts at $$$1$$$, the system chooses some shortest path from $$$1$$$ to $$$4$$$. There is only one such path, it is $$$[1, 5, 4]$$$;  Polycarp chooses to drive to $$$2$$$, which is not along the path chosen by the system. When Polycarp arrives at $$$2$$$, the navigator rebuilds the path by choosing some shortest path from $$$2$$$ to $$$4$$$, for example, $$$[2, 6, 4]$$$ (note that it could choose $$$[2, 3, 4]$$$);  Polycarp chooses to drive to $$$3$$$, which is not along the path chosen by the system. When Polycarp arrives at $$$3$$$, the navigator rebuilds the path by choosing the only shortest path from $$$3$$$ to $$$4$$$, which is $$$[3, 4]$$$;  Polycarp arrives at $$$4$$$ along the road chosen by the navigator, so the system does not have to rebuild anything. Overall, we get $$$2$$$ rebuilds in this scenario. Note that if the system chose $$$[2, 3, 4]$$$ instead of $$$[2, 6, 4]$$$ during the second step, there would be only $$$1$$$ rebuild (since Polycarp goes along the path, so the system maintains the path $$$[3, 4]$$$ during the third step).The example shows us that the number of rebuilds can differ even if the map of Bertown and the path chosen by Polycarp stays the same. Given this information (the map and Polycarp's path), can you determine the minimum and the maximum number of rebuilds that could have happened during the journey?", "input_spec": "The first line contains two integers $$$n$$$ and $$$m$$$ ($$$2 \\le n \\le m \\le 2 \\cdot 10^5$$$) \u2014 the number of intersections and one-way roads in Bertown, respectively. Then $$$m$$$ lines follow, each describing a road. Each line contains two integers $$$u$$$ and $$$v$$$ ($$$1 \\le u, v \\le n$$$, $$$u \\ne v$$$) denoting a road from intersection $$$u$$$ to intersection $$$v$$$. All roads in Bertown are pairwise distinct, which means that each ordered pair $$$(u, v)$$$ appears at most once in these $$$m$$$ lines (but if there is a road $$$(u, v)$$$, the road $$$(v, u)$$$ can also appear). The following line contains one integer $$$k$$$ ($$$2 \\le k \\le n$$$) \u2014 the number of intersections in Polycarp's path from home to his workplace. The last line contains $$$k$$$ integers $$$p_1$$$, $$$p_2$$$, ..., $$$p_k$$$ ($$$1 \\le p_i \\le n$$$, all these integers are pairwise distinct) \u2014 the intersections along Polycarp's path in the order he arrived at them. $$$p_1$$$ is the intersection where Polycarp lives ($$$s = p_1$$$), and $$$p_k$$$ is the intersection where Polycarp's workplace is situated ($$$t = p_k$$$). It is guaranteed that for every $$$i \\in [1, k - 1]$$$ the road from $$$p_i$$$ to $$$p_{i + 1}$$$ exists, so the path goes along the roads of Bertown. ", "output_spec": "Print two integers: the minimum and the maximum number of rebuilds that could have happened during the journey.", "sample_inputs": ["6 9\n1 5\n5 4\n1 2\n2 3\n3 4\n4 1\n2 6\n6 4\n4 2\n4\n1 2 3 4", "7 7\n1 2\n2 3\n3 4\n4 5\n5 6\n6 7\n7 1\n7\n1 2 3 4 5 6 7", "8 13\n8 7\n8 6\n7 5\n7 4\n6 5\n6 4\n5 3\n5 2\n4 3\n4 2\n3 1\n2 1\n1 8\n5\n8 7 5 2 1"], "sample_outputs": ["1 2", "0 0", "0 3"], "notes": null}, "src_uid": "19a0c05eb2d1559ccfe60e210c6fcd6a"}
{"nl": {"description": "You are given names of two days of the week.Please, determine whether it is possible that during some non-leap year the first day of some month was equal to the first day of the week you are given, while the first day of the next month was equal to the second day of the week you are given. Both months should belong to one year.In this problem, we consider the Gregorian calendar to be used. The number of months in this calendar is equal to 12. The number of days in months during any non-leap year is: 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31.Names of the days of the week are given with lowercase English letters: \"monday\", \"tuesday\", \"wednesday\", \"thursday\", \"friday\", \"saturday\", \"sunday\".", "input_spec": "The input consists of two lines, each of them containing the name of exactly one day of the week. It's guaranteed that each string in the input is from the set \"monday\", \"tuesday\", \"wednesday\", \"thursday\", \"friday\", \"saturday\", \"sunday\".", "output_spec": "Print \"YES\" (without quotes) if such situation is possible during some non-leap year. Otherwise, print \"NO\" (without quotes).", "sample_inputs": ["monday\ntuesday", "sunday\nsunday", "saturday\ntuesday"], "sample_outputs": ["NO", "YES", "YES"], "notes": "NoteIn the second sample, one can consider February 1 and March 1 of year 2015. Both these days were Sundays.In the third sample, one can consider July 1 and August 1 of year 2017. First of these two days is Saturday, while the second one is Tuesday."}, "src_uid": "2a75f68a7374b90b80bb362c6ead9a35"}
{"nl": {"description": "Allen has a LOT of money. He has $$$n$$$ dollars in the bank. For security reasons, he wants to withdraw it in cash (we will not disclose the reasons here). The denominations for dollar bills are $$$1$$$, $$$5$$$, $$$10$$$, $$$20$$$, $$$100$$$. What is the minimum number of bills Allen could receive after withdrawing his entire balance?", "input_spec": "The first and only line of input contains a single integer $$$n$$$ ($$$1 \\le n \\le 10^9$$$).", "output_spec": "Output the minimum number of bills that Allen could receive.", "sample_inputs": ["125", "43", "1000000000"], "sample_outputs": ["3", "5", "10000000"], "notes": "NoteIn the first sample case, Allen can withdraw this with a $$$100$$$ dollar bill, a $$$20$$$ dollar bill, and a $$$5$$$ dollar bill. There is no way for Allen to receive $$$125$$$ dollars in one or two bills.In the second sample case, Allen can withdraw two $$$20$$$ dollar bills and three $$$1$$$ dollar bills.In the third sample case, Allen can withdraw $$$100000000$$$ (ten million!) $$$100$$$ dollar bills."}, "src_uid": "8e81ad7110552c20297f08ad3e5f8ddc"}
{"nl": {"description": "Arkady decided to buy roses for his girlfriend.A flower shop has white, orange and red roses, and the total amount of them is n. Arkady thinks that red roses are not good together with white roses, so he won't buy a bouquet containing both red and white roses. Also, Arkady won't buy a bouquet where all roses have the same color. Arkady wants to buy exactly k roses. For each rose in the shop he knows its beauty and color: the beauty of the i-th rose is bi, and its color is ci ('W' for a white rose, 'O' for an orange rose and 'R' for a red rose). Compute the maximum possible total beauty of a bouquet of k roses satisfying the constraints above or determine that it is not possible to make such a bouquet.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u2009200\u2009000) \u2014 the number of roses in the show and the number of roses Arkady wants to buy. The second line contains a sequence of integers b1,\u2009b2,\u2009...,\u2009bn (1\u2009\u2264\u2009bi\u2009\u2264\u200910\u2009000), where bi equals the beauty of the i-th rose. The third line contains a string c of length n, consisting of uppercase English letters 'W', 'O' and 'R', where ci denotes the color of the i-th rose: 'W' denotes white, 'O' \u00a0\u2014 orange, 'R' \u2014 red.", "output_spec": "Print the maximum possible total beauty of a bouquet of k roses that satisfies the constraints above. If it is not possible to make a single such bouquet, print -1.", "sample_inputs": ["5 3\n4 3 4 1 6\nRROWW", "5 2\n10 20 14 20 11\nRRRRR", "11 5\n5 6 3 2 3 4 7 5 4 5 6\nRWOORWORROW"], "sample_outputs": ["11", "-1", "28"], "notes": "NoteIn the first example Arkady wants to buy 3 roses. He can, for example, buy both red roses (their indices are 1 and 2, and their total beauty is 7) and the only orange rose (its index is 3, its beauty is 4). This way the total beauty of the bouquet is 11. In the second example Arkady can not buy a bouquet because all roses have the same color."}, "src_uid": "104cf5253e027929f257364b3874c38b"}
{"nl": {"description": "Yakko, Wakko and Dot, world-famous animaniacs, decided to rest from acting in cartoons, and take a leave to travel a bit. Yakko dreamt to go to Pennsylvania, his Motherland and the Motherland of his ancestors. Wakko thought about Tasmania, its beaches, sun and sea. Dot chose Transylvania as the most mysterious and unpredictable place.But to their great regret, the leave turned to be very short, so it will be enough to visit one of the three above named places. That's why Yakko, as the cleverest, came up with a truly genius idea: let each of the three roll an ordinary six-sided die, and the one with the highest amount of points will be the winner, and will take the other two to the place of his/her dreams.Yakko thrown a die and got Y points, Wakko \u2014 W points. It was Dot's turn. But she didn't hurry. Dot wanted to know for sure what were her chances to visit Transylvania.It is known that Yakko and Wakko are true gentlemen, that's why if they have the same amount of points with Dot, they will let Dot win.", "input_spec": "The only line of the input file contains two natural numbers Y and W \u2014 the results of Yakko's and Wakko's die rolls.", "output_spec": "Output the required probability in the form of irreducible fraction in format \u00abA/B\u00bb, where A \u2014 the numerator, and B \u2014 the denominator. If the required probability equals to zero, output \u00ab0/1\u00bb. If the required probability equals to 1, output \u00ab1/1\u00bb. ", "sample_inputs": ["4 2"], "sample_outputs": ["1/2"], "notes": "NoteDot will go to Transylvania, if she is lucky to roll 4, 5 or 6 points."}, "src_uid": "f97eb4ecffb6cbc8679f0c621fd59414"}
{"nl": {"description": "Santa Claus is the first who came to the Christmas Olympiad, and he is going to be the first to take his place at a desk! In the classroom there are n lanes of m desks each, and there are two working places at each of the desks. The lanes are numbered from 1 to n from the left to the right, the desks in a lane are numbered from 1 to m starting from the blackboard. Note that the lanes go perpendicularly to the blackboard, not along it (see picture).The organizers numbered all the working places from 1 to 2nm. The places are numbered by lanes (i.\u00a0e. all the places of the first lane go first, then all the places of the second lane, and so on), in a lane the places are numbered starting from the nearest to the blackboard (i.\u00a0e. from the first desk in the lane), at each desk, the place on the left is numbered before the place on the right.    The picture illustrates the first and the second samples. Santa Clause knows that his place has number k. Help him to determine at which lane at which desk he should sit, and whether his place is on the left or on the right!", "input_spec": "The only line contains three integers n, m and k (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200910\u2009000, 1\u2009\u2264\u2009k\u2009\u2264\u20092nm)\u00a0\u2014 the number of lanes, the number of desks in each lane and the number of Santa Claus' place.", "output_spec": "Print two integers: the number of lane r, the number of desk d, and a character s, which stands for the side of the desk Santa Claus. The character s should be \"L\", if Santa Clause should sit on the left, and \"R\" if his place is on the right.", "sample_inputs": ["4 3 9", "4 3 24", "2 4 4"], "sample_outputs": ["2 2 L", "4 3 R", "1 2 R"], "notes": "NoteThe first and the second samples are shown on the picture. The green place corresponds to Santa Claus' place in the first example, the blue place corresponds to Santa Claus' place in the second example.In the third sample there are two lanes with four desks in each, and Santa Claus has the fourth place. Thus, his place is in the first lane at the second desk on the right."}, "src_uid": "d6929926b44c2d5b1a8e6b7f965ca1bb"}
{"nl": {"description": "For a positive integer n let's define a function f:f(n)\u2009=\u2009\u2009-\u20091\u2009+\u20092\u2009-\u20093\u2009+\u2009..\u2009+\u2009(\u2009-\u20091)nn Your task is to calculate f(n) for a given integer n.", "input_spec": "The single line contains the positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091015).", "output_spec": "Print f(n) in a single line.", "sample_inputs": ["4", "5"], "sample_outputs": ["2", "-3"], "notes": "Notef(4)\u2009=\u2009\u2009-\u20091\u2009+\u20092\u2009-\u20093\u2009+\u20094\u2009=\u20092f(5)\u2009=\u2009\u2009-\u20091\u2009+\u20092\u2009-\u20093\u2009+\u20094\u2009-\u20095\u2009=\u2009\u2009-\u20093"}, "src_uid": "689e7876048ee4eb7479e838c981f068"}
{"nl": {"description": "For a given positive integer n denote its k-rounding as the minimum positive integer x, such that x ends with k or more zeros in base 10 and is divisible by n.For example, 4-rounding of 375 is 375\u00b780\u2009=\u200930000. 30000 is the minimum integer such that it ends with 4 or more zeros and is divisible by 375.Write a program that will perform the k-rounding of n.", "input_spec": "The only line contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u2009109, 0\u2009\u2264\u2009k\u2009\u2264\u20098).", "output_spec": "Print the k-rounding of n.", "sample_inputs": ["375 4", "10000 1", "38101 0", "123456789 8"], "sample_outputs": ["30000", "10000", "38101", "12345678900000000"], "notes": null}, "src_uid": "73566d4d9f20f7bbf71bc06bc9a4e9f3"}
{"nl": {"description": "The Tower of Hanoi is a well-known mathematical puzzle. It consists of three rods, and a number of disks of different sizes which can slide onto any rod. The puzzle starts with the disks in a neat stack in ascending order of size on one rod, the smallest at the top, thus making a conical shape.The objective of the puzzle is to move the entire stack to another rod, obeying the following simple rules:   Only one disk can be moved at a time.  Each move consists of taking the upper disk from one of the stacks and placing it on top of another stack i.e. a disk can only be moved if it is the uppermost disk on a stack.  No disk may be placed on top of a smaller disk. With three disks, the puzzle can be solved in seven moves. The minimum number of moves required to solve a Tower of Hanoi puzzle is 2n\u2009-\u20091, where n is the number of disks. (c) Wikipedia.SmallY's puzzle is very similar to the famous Tower of Hanoi. In the Tower of Hanoi puzzle you need to solve a puzzle in minimum number of moves, in SmallY's puzzle each move costs some money and you need to solve the same puzzle but for minimal cost. At the beginning of SmallY's puzzle all n disks are on the first rod. Moving a disk from rod i to rod j (1\u2009\u2264\u2009i,\u2009j\u2009\u2264\u20093) costs tij units of money. The goal of the puzzle is to move all the disks to the third rod.In the problem you are given matrix t and an integer n. You need to count the minimal cost of solving SmallY's puzzle, consisting of n disks.", "input_spec": "Each of the first three lines contains three integers \u2014 matrix t. The j-th integer in the i-th line is tij (1\u2009\u2264\u2009tij\u2009\u2264\u200910000;\u00a0i\u2009\u2260\u2009j). The following line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200940) \u2014 the number of disks. It is guaranteed that for all i (1\u2009\u2264\u2009i\u2009\u2264\u20093), tii\u2009=\u20090.", "output_spec": "Print a single integer \u2014 the minimum cost of solving SmallY's puzzle.", "sample_inputs": ["0 1 1\n1 0 1\n1 1 0\n3", "0 2 2\n1 0 100\n1 2 0\n3", "0 2 1\n1 0 100\n1 2 0\n5"], "sample_outputs": ["7", "19", "87"], "notes": null}, "src_uid": "c4c20228624365e39299d0a6e8fe7095"}
{"nl": {"description": "One quite ordinary day Valera went to school (there's nowhere else he should go on a week day). In a maths lesson his favorite teacher Ms. Evans told students about divisors. Despite the fact that Valera loved math, he didn't find this particular topic interesting. Even more, it seemed so boring that he fell asleep in the middle of a lesson. And only a loud ringing of a school bell could interrupt his sweet dream. Of course, the valuable material and the teacher's explanations were lost. However, Valera will one way or another have to do the homework. As he does not know the new material absolutely, he cannot do the job himself. That's why he asked you to help. You're his best friend after all, you just cannot refuse to help. Valera's home task has only one problem, which, though formulated in a very simple way, has not a trivial solution. Its statement looks as follows: if we consider all positive integers in the interval [a;b] then it is required to count the amount of such numbers in this interval that their smallest divisor will be a certain integer k (you do not have to consider divisor equal to one). In other words, you should count the amount of such numbers from the interval [a;b], that are not divisible by any number between 2 and k\u2009-\u20091 and yet are divisible by k. ", "input_spec": "The first and only line contains three positive integers a, b, k (1\u2009\u2264\u2009a\u2009\u2264\u2009b\u2009\u2264\u20092\u00b7109,\u20092\u2009\u2264\u2009k\u2009\u2264\u20092\u00b7109). ", "output_spec": "Print on a single line the answer to the given problem. ", "sample_inputs": ["1 10 2", "12 23 3", "6 19 5"], "sample_outputs": ["5", "2", "0"], "notes": "NoteComments to the samples from the statement: In the first sample the answer is numbers 2,\u20094,\u20096,\u20098,\u200910.In the second one \u2014 15,\u200921In the third one there are no such numbers."}, "src_uid": "04a26f1d1013b6e6b4b0bdcf225475f2"}
{"nl": {"description": "You are given the current time in 24-hour format hh:mm. Find and print the time after a minutes.Note that you should find only the time after a minutes, see the examples to clarify the problem statement.You can read more about 24-hour format here https://en.wikipedia.org/wiki/24-hour_clock.", "input_spec": "The first line contains the current time in the format hh:mm (0\u2009\u2264\u2009hh\u2009<\u200924,\u20090\u2009\u2264\u2009mm\u2009<\u200960). The hours and the minutes are given with two digits (the hours or the minutes less than 10 are given with the leading zeroes). The second line contains integer a (0\u2009\u2264\u2009a\u2009\u2264\u2009104) \u2014 the number of the minutes passed.", "output_spec": "The only line should contain the time after a minutes in the format described in the input. Note that you should print exactly two digits for the hours and the minutes (add leading zeroes to the numbers if needed). See the examples to check the input/output format.", "sample_inputs": ["23:59\n10", "20:20\n121", "10:10\n0"], "sample_outputs": ["00:09", "22:21", "10:10"], "notes": null}, "src_uid": "20c2d9da12d6b88f300977d74287a15d"}
{"nl": {"description": "A + B is often used as an example of the easiest problem possible to show some contest platform. However, some scientists have observed that sometimes this problem is not so easy to get accepted. Want to try?", "input_spec": "The input contains two integers a and b (0\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009103), separated by a single space.", "output_spec": "Output the sum of the given integers.", "sample_inputs": ["5 14", "381 492"], "sample_outputs": ["19", "873"], "notes": null}, "src_uid": "b6e3f9c9b124ec3ec20eb8fcea075add"}
{"nl": {"description": "Permutation p is an ordered set of integers p1,\u2009\u2009p2,\u2009\u2009...,\u2009\u2009pn, consisting of n distinct positive integers, each of them doesn't exceed n. We'll denote the i-th element of permutation p as pi. We'll call number n the size or the length of permutation p1,\u2009\u2009p2,\u2009\u2009...,\u2009\u2009pn.We'll call position i (1\u2009\u2264\u2009i\u2009\u2264\u2009n) in permutation p1,\u2009p2,\u2009...,\u2009pn good, if |p[i]\u2009-\u2009i|\u2009=\u20091. Count the number of permutations of size n with exactly k good positions. Print the answer modulo 1000000007 (109\u2009+\u20097).", "input_spec": "The single line contains two space-separated integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u20091000,\u20090\u2009\u2264\u2009k\u2009\u2264\u2009n).", "output_spec": "Print the number of permutations of length n with exactly k good positions modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["1 0", "2 1", "3 2", "4 1", "7 4"], "sample_outputs": ["1", "0", "4", "6", "328"], "notes": "NoteThe only permutation of size 1 has 0 good positions.Permutation (1,\u20092) has 0 good positions, and permutation (2,\u20091) has 2 positions.Permutations of size 3: (1,\u20092,\u20093) \u2014 0 positions  \u2014 2 positions  \u2014 2 positions  \u2014 2 positions  \u2014 2 positions (3,\u20092,\u20091) \u2014 0 positions"}, "src_uid": "1243e98fe2ebd6e6d1de851984b96079"}
{"nl": {"description": "Karlsson has visited Lillebror again. They found a box of chocolates and a big whipped cream cake at Lillebror's place. Karlsson immediately suggested to divide the sweets fairly between Lillebror and himself. Specifically, to play together a game he has just invented with the chocolates. The winner will get the cake as a reward.The box of chocolates has the form of a hexagon. It contains 19 cells for the chocolates, some of which contain a chocolate. The players move in turns. During one move it is allowed to eat one or several chocolates that lay in the neighboring cells on one line, parallel to one of the box's sides. The picture below shows the examples of allowed moves and of an unacceptable one. The player who cannot make a move loses.  Karlsson makes the first move as he is Lillebror's guest and not vice versa. The players play optimally. Determine who will get the cake.", "input_spec": "The input data contains 5 lines, containing 19 words consisting of one symbol. The word \"O\" means that the cell contains a chocolate and a \".\" stands for an empty cell. It is guaranteed that the box contains at least one chocolate. See the examples for better understanding.", "output_spec": "If Karlsson gets the cake, print \"Karlsson\" (without the quotes), otherwise print \"Lillebror\" (yet again without the quotes).", "sample_inputs": [". . .\n . . O .\n. . O O .\n . . . .\n  . . .", ". . .\n . . . O\n. . . O .\n O . O .\n  . O ."], "sample_outputs": ["Lillebror", "Karlsson"], "notes": null}, "src_uid": "eaa022cc7846c983a826900dc6dd919f"}
{"nl": {"description": "InputThe input contains a single integer a (0\u2009\u2264\u2009a\u2009\u2264\u200935).OutputOutput a single integer.ExamplesInput3Output8Input10Output1024", "input_spec": "The input contains a single integer a (0\u2009\u2264\u2009a\u2009\u2264\u200935).", "output_spec": "Output a single integer.", "sample_inputs": ["3", "10"], "sample_outputs": ["8", "1024"], "notes": null}, "src_uid": "76f6ebfaeea789952c931d65c6a5fdff"}
{"nl": {"description": "Ralph has a magic field which is divided into n\u2009\u00d7\u2009m blocks. That is to say, there are n rows and m columns on the field. Ralph can put an integer in each block. However, the magic field doesn't always work properly. It works only if the product of integers in each row and each column equals to k, where k is either 1 or -1.Now Ralph wants you to figure out the number of ways to put numbers in each block in such a way that the magic field works properly. Two ways are considered different if and only if there exists at least one block where the numbers in the first way and in the second way are different. You are asked to output the answer modulo 1000000007\u2009=\u2009109\u2009+\u20097.Note that there is no range of the numbers to put in the blocks, but we can prove that the answer is not infinity.", "input_spec": "The only line contains three integers n, m and k (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20091018, k is either 1 or -1).", "output_spec": "Print a single number denoting the answer modulo 1000000007.", "sample_inputs": ["1 1 -1", "1 3 1", "3 3 -1"], "sample_outputs": ["1", "1", "16"], "notes": "NoteIn the first example the only way is to put -1 into the only block.In the second example the only way is to put 1 into every block."}, "src_uid": "6b9eff690fae14725885cbc891ff7243"}
{"nl": {"description": "You have probably registered on Internet sites many times. And each time you should enter your invented password. Usually the registration form automatically checks the password's crypt resistance. If the user's password isn't complex enough, a message is displayed. Today your task is to implement such an automatic check.Web-developers of the company Q assume that a password is complex enough, if it meets all of the following conditions:  the password length is at least 5 characters;  the password contains at least one large English letter;  the password contains at least one small English letter;  the password contains at least one digit. You are given a password. Please implement the automatic check of its complexity for company Q.", "input_spec": "The first line contains a non-empty sequence of characters (at most 100 characters). Each character is either a large English letter, or a small English letter, or a digit, or one of characters: \"!\", \"?\", \".\", \",\", \"_\".", "output_spec": "If the password is complex enough, print message \"Correct\" (without the quotes), otherwise print message \"Too weak\" (without the quotes).", "sample_inputs": ["abacaba", "X12345", "CONTEST_is_STARTED!!11"], "sample_outputs": ["Too weak", "Too weak", "Correct"], "notes": null}, "src_uid": "42a964b01e269491975965860ec92be7"}
{"nl": {"description": " In every generation there is a Chosen One. She alone will stand against the vampires, the demons, and the forces of darkness. She is the Slayer. \u2014 Joss Whedon ", "input_spec": "A string $$$s$$$ ($$$3 \\le |s| \\le 7$$$) consisting of lowercase English letters.", "output_spec": "A single string. If there is no answer, print \"none\" (without the quotes).", "sample_inputs": ["tourist"], "sample_outputs": ["ooggqjx"], "notes": null}, "src_uid": "56ec50526a3843fe3784d395850f45ae"}
{"nl": {"description": "You are given a text of single-space separated words, consisting of small and capital Latin letters.Volume of the word is number of capital letters in the word. Volume of the text is maximum volume of all words in the text.Calculate the volume of the given text.", "input_spec": "The first line contains one integer number n (1\u2009\u2264\u2009n\u2009\u2264\u2009200) \u2014 length of the text. The second line contains text of single-space separated words s1,\u2009s2,\u2009...,\u2009si, consisting only of small and capital Latin letters.", "output_spec": "Print one integer number \u2014 volume of text.", "sample_inputs": ["7\nNonZERO", "24\nthis is zero answer text", "24\nHarbour Space University"], "sample_outputs": ["5", "0", "1"], "notes": "NoteIn the first example there is only one word, there are 5 capital letters in it.In the second example all of the words contain 0 capital letters."}, "src_uid": "d3929a9acf1633475ab16f5dfbead13c"}
{"nl": {"description": "Baby Badawy's first words were \"AND 0 SUM BIG\", so he decided to solve the following problem. Given two integers $$$n$$$ and $$$k$$$, count the number of arrays of length $$$n$$$ such that:  all its elements are integers between $$$0$$$ and $$$2^k-1$$$ (inclusive);  the bitwise AND of all its elements is $$$0$$$;  the sum of its elements is as large as possible. Since the answer can be very large, print its remainder when divided by $$$10^9+7$$$.", "input_spec": "The first line contains an integer $$$t$$$ ($$$1 \\le t \\le 10$$$)\u00a0\u2014 the number of test cases you need to solve. Each test case consists of a line containing two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 10^{5}$$$, $$$1 \\le k \\le 20$$$).", "output_spec": "For each test case, print the number of arrays satisfying the conditions. Since the answer can be very large, print its remainder when divided by $$$10^9+7$$$.", "sample_inputs": ["2\n2 2\n100000 20"], "sample_outputs": ["4\n226732710"], "notes": "NoteIn the first example, the $$$4$$$ arrays are:  $$$[3,0]$$$,  $$$[0,3]$$$,  $$$[1,2]$$$,  $$$[2,1]$$$. "}, "src_uid": "2e7a9f3a97938e4a7e036520d812b97a"}
{"nl": {"description": "For each positive integer n consider the integer \u03c8(n) which is obtained from n by replacing every digit a in the decimal notation of n with the digit (9\u2009\u2009-\u2009\u2009a). We say that \u03c8(n) is the reflection of n. For example, reflection of 192 equals 807. Note that leading zeros (if any) should be omitted. So reflection of 9 equals 0, reflection of 91 equals 8.Let us call the weight of the number the product of the number and its reflection. Thus, the weight of the number 10 is equal to 10\u00b789\u2009=\u2009890.Your task is to find the maximum weight of the numbers in the given range [l,\u2009r] (boundaries are included).", "input_spec": "Input contains two space-separated integers l and r (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009109) \u2014 bounds of the range.", "output_spec": "Output should contain single integer number: maximum value of the product n\u00b7\u03c8(n), where l\u2009\u2264\u2009n\u2009\u2264\u2009r. Please, do not use %lld specificator to read or write 64-bit integers in C++. It is preferred to use cout (also you may use %I64d).", "sample_inputs": ["3 7", "1 1", "8 10"], "sample_outputs": ["20", "8", "890"], "notes": "NoteIn the third sample weight of 8 equals 8\u00b71\u2009=\u20098, weight of 9 equals 9\u00b70\u2009=\u20090, weight of 10 equals 890.Thus, maximum value of the product is equal to 890."}, "src_uid": "2c4b2a162563242cb2f43f6209b59d5e"}
{"nl": {"description": "Calculate the number of ways to place $$$n$$$ rooks on $$$n \\times n$$$ chessboard so that both following conditions are met:  each empty cell is under attack;  exactly $$$k$$$ pairs of rooks attack each other. An empty cell is under attack if there is at least one rook in the same row or at least one rook in the same column. Two rooks attack each other if they share the same row or column, and there are no other rooks between them. For example, there are only two pairs of rooks that attack each other in the following picture:  One of the ways to place the rooks for $$$n = 3$$$ and $$$k = 2$$$ Two ways to place the rooks are considered different if there exists at least one cell which is empty in one of the ways but contains a rook in another way.The answer might be large, so print it modulo $$$998244353$$$.", "input_spec": "The only line of the input contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 200000$$$; $$$0 \\le k \\le \\frac{n(n - 1)}{2}$$$).", "output_spec": "Print one integer \u2014 the number of ways to place the rooks, taken modulo $$$998244353$$$.", "sample_inputs": ["3 2", "3 3", "4 0", "1337 42"], "sample_outputs": ["6", "0", "24", "807905441"], "notes": null}, "src_uid": "6c1a9aaa7bdd7de97220b8c6d35740cc"}
{"nl": {"description": "This is the easy version of this problem. The difference between easy and hard versions is the constraint on $$$k$$$ and the time limit. Also, in this version of the problem, you only need to calculate the answer when $$$n=k$$$. You can make hacks only if both versions of the problem are solved.Cirno is playing a war simulator game with $$$n$$$ towers (numbered from $$$1$$$ to $$$n$$$) and $$$n$$$ bots (numbered from $$$1$$$ to $$$n$$$). The $$$i$$$-th tower is initially occupied by the $$$i$$$-th bot for $$$1 \\le i \\le n$$$.Before the game, Cirno first chooses a permutation $$$p = [p_1, p_2, \\ldots, p_n]$$$ of length $$$n$$$ (A permutation of length $$$n$$$ is an array of length $$$n$$$ where each integer between $$$1$$$ and $$$n$$$ appears exactly once). After that, she can choose a sequence $$$a = [a_1, a_2, \\ldots, a_n]$$$ ($$$1 \\le a_i \\le n$$$ and $$$a_i \\ne i$$$ for all $$$1 \\le i \\le n$$$).The game has $$$n$$$ rounds of attacks. In the $$$i$$$-th round, if the $$$p_i$$$-th bot is still in the game, it will begin its attack, and as the result the $$$a_{p_i}$$$-th tower becomes occupied by the $$$p_i$$$-th bot; the bot that previously occupied the $$$a_{p_i}$$$-th tower will no longer occupy it. If the $$$p_i$$$-th bot is not in the game, nothing will happen in this round.After each round, if a bot doesn't occupy any towers, it will be eliminated and leave the game. Please note that no tower can be occupied by more than one bot, but one bot can occupy more than one tower during the game.At the end of the game, Cirno will record the result as a sequence $$$b = [b_1, b_2, \\ldots, b_n]$$$, where $$$b_i$$$ is the number of the bot that occupies the $$$i$$$-th tower at the end of the game.However, as a mathematics master, she wants you to solve the following counting problem instead of playing games:Count the number of different pairs of sequences $$$a$$$ and $$$b$$$ that we can get from all possible choices of sequence $$$a$$$ and permutation $$$p$$$.Since this number may be large, output it modulo $$$M$$$.", "input_spec": "The only line contains two positive integers $$$k$$$ and $$$M$$$ ($$$1\\le k\\le 5000$$$, $$$2\\le M\\le 10^9$$$ ). It is guaranteed that $$$2^{18}$$$ is a divisor of $$$M-1$$$ and $$$M$$$ is a prime number. You need to calculate the answer for $$$n=k$$$.", "output_spec": "Output a single integer \u2014 the number of different pairs of sequences for $$$n=k$$$ modulo $$$M$$$.", "sample_inputs": ["1 998244353", "2 998244353", "3 998244353", "8 998244353"], "sample_outputs": ["0", "2", "24", "123391016"], "notes": "NoteFor $$$n=1$$$, no valid sequence $$$a$$$ exists. We regard the answer as $$$0$$$.For $$$n=2$$$, there is only one possible array $$$a$$$: $$$[2, 1]$$$.   For array $$$a$$$ is $$$[2, 1]$$$ and permutation $$$p$$$ is $$$[1, 2]$$$, the sequence $$$b$$$ will be $$$[1, 1]$$$ after all rounds have finished. The details for each rounds:   In the first round, the first bot will begin its attack and successfully capture the tower $$$2$$$. After this round, the second bot will be eliminated and leave the game as all of its towers are occupied by other bots.  In the second round, the second bot is not in the game.   For array $$$a$$$ is $$$[2, 1]$$$ and permutation $$$p$$$ is $$$[2, 1]$$$, the sequence $$$b$$$ will be $$$[2, 2]$$$ after all rounds have finished. The details for each rounds:   In the first round, the second bot will begin its attack and successfully capture the tower $$$1$$$. After this round, the first bot will be eliminated and leave the game as all of its towers are occupied by other bots.  In the second round, the first bot is not in the game.  So the number of different pairs of sequences $$$(a,b)$$$ is $$$2$$$ ($$$[2, 1]$$$, $$$[1, 1]$$$ and $$$[2, 1]$$$, $$$[2, 2]$$$) for $$$n=2$$$."}, "src_uid": "2d5a5055aaf34f4d300cfdf7c21748c3"}
{"nl": {"description": "Today, Mezo is playing a game. Zoma, a character in that game, is initially at position $$$x = 0$$$. Mezo starts sending $$$n$$$ commands to Zoma. There are two possible commands:  'L' (Left) sets the position $$$x: =x - 1$$$;  'R' (Right) sets the position $$$x: =x + 1$$$. Unfortunately, Mezo's controller malfunctions sometimes. Some commands are sent successfully and some are ignored. If the command is ignored then the position $$$x$$$ doesn't change and Mezo simply proceeds to the next command.For example, if Mezo sends commands \"LRLR\", then here are some possible outcomes (underlined commands are sent successfully):   \"LRLR\" \u2014 Zoma moves to the left, to the right, to the left again and to the right for the final time, ending up at position $$$0$$$;  \"LRLR\" \u2014 Zoma recieves no commands, doesn't move at all and ends up at position $$$0$$$ as well;  \"LRLR\" \u2014 Zoma moves to the left, then to the left again and ends up in position $$$-2$$$. Mezo doesn't know which commands will be sent successfully beforehand. Thus, he wants to know how many different positions may Zoma end up at.", "input_spec": "The first line contains $$$n$$$ $$$(1 \\le n \\le 10^5)$$$ \u2014 the number of commands Mezo sends. The second line contains a string $$$s$$$ of $$$n$$$ commands, each either 'L' (Left) or 'R' (Right).", "output_spec": "Print one integer \u2014 the number of different positions Zoma may end up at.", "sample_inputs": ["4\nLRLR"], "sample_outputs": ["5"], "notes": "NoteIn the example, Zoma may end up anywhere between $$$-2$$$ and $$$2$$$."}, "src_uid": "098ade88ed90664da279fe8a5a54b5ba"}
{"nl": {"description": "You have a set of $$$n$$$ weights. You know that their masses are $$$a_1$$$, $$$a_2$$$, ..., $$$a_n$$$ grams, but you don't know which of them has which mass. You can't distinguish the weights.However, your friend does know the mass of each weight. You can ask your friend to give you exactly $$$k$$$ weights with the total mass $$$m$$$ (both parameters $$$k$$$ and $$$m$$$ are chosen by you), and your friend will point to any valid subset of weights, if it is possible.You are allowed to make this query only once. Find the maximum possible number of weights you can reveal after this query.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 100$$$)\u00a0\u2014 the number of weights. The second line contains $$$n$$$ integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$1 \\le a_i \\le 100$$$)\u00a0\u2014 the masses of the weights.", "output_spec": "Print the maximum number of weights you can learn the masses for after making a single query.", "sample_inputs": ["4\n1 4 2 2", "6\n1 2 4 4 4 9"], "sample_outputs": ["2", "2"], "notes": "NoteIn the first example we can ask for a subset of two weights with total mass being equal to $$$4$$$, and the only option is to get $$$\\{2, 2\\}$$$.Another way to obtain the same result is to ask for a subset of two weights with the total mass of $$$5$$$ and get $$$\\{1, 4\\}$$$. It is easy to see that the two remaining weights have mass of $$$2$$$ grams each.In the second example we can ask for a subset of two weights with total mass being $$$8$$$, and the only answer is $$$\\{4, 4\\}$$$. We can prove it is not possible to learn masses for three weights in one query, but we won't put the proof here."}, "src_uid": "ccc4b27889598266e8efe73b8aa3666c"}
{"nl": {"description": "n evenly spaced points have been marked around the edge of a circle. There is a number written at each point. You choose a positive real number k. Then you may repeatedly select a set of 2 or more points which are evenly spaced, and either increase all numbers at points in the set by k or decrease all numbers at points in the set by k. You would like to eventually end up with all numbers equal to 0. Is it possible?A set of 2 points is considered evenly spaced if they are diametrically opposed, and a set of 3 or more points is considered evenly spaced if they form a regular polygon.", "input_spec": "The first line of input contains an integer n (3\u2009\u2264\u2009n\u2009\u2264\u2009100000), the number of points along the circle. The following line contains a string s with exactly n digits, indicating the numbers initially present at each of the points, in clockwise order.", "output_spec": "Print \"YES\" (without quotes) if there is some sequence of operations that results in all numbers being 0, otherwise \"NO\" (without quotes). You can print each letter in any case (upper or lower).", "sample_inputs": ["30\n000100000100000110000000001100", "6\n314159"], "sample_outputs": ["YES", "NO"], "notes": "NoteIf we label the points from 1 to n, then for the first test case we can set k\u2009=\u20091. Then we increase the numbers at points 7 and 22 by 1, then decrease the numbers at points 7, 17, and 27 by 1, then decrease the numbers at points 4, 10, 16, 22, and 28 by 1."}, "src_uid": "63c00c5ea7aee792e8a30dc2c330c3f7"}
{"nl": {"description": "Arkady and his friends love playing checkers on an $$$n \\times n$$$ field. The rows and the columns of the field are enumerated from $$$1$$$ to $$$n$$$.The friends have recently won a championship, so Arkady wants to please them with some candies. Remembering an old parable (but not its moral), Arkady wants to give to his friends one set of candies per each cell of the field: the set of candies for cell $$$(i, j)$$$ will have exactly $$$(i^2 + j^2)$$$ candies of unique type.There are $$$m$$$ friends who deserve the present. How many of these $$$n \\times n$$$ sets of candies can be split equally into $$$m$$$ parts without cutting a candy into pieces? Note that each set has to be split independently since the types of candies in different sets are different.", "input_spec": "The only line contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n \\le 10^9$$$, $$$1 \\le m \\le 1000$$$)\u00a0\u2014 the size of the field and the number of parts to split the sets into.", "output_spec": "Print a single integer\u00a0\u2014 the number of sets that can be split equally.", "sample_inputs": ["3 3", "6 5", "1000000000 1"], "sample_outputs": ["1", "13", "1000000000000000000"], "notes": "NoteIn the first example, only the set for cell $$$(3, 3)$$$ can be split equally ($$$3^2 + 3^2 = 18$$$, which is divisible by $$$m=3$$$).In the second example, the sets for the following cells can be divided equally:   $$$(1, 2)$$$ and $$$(2, 1)$$$, since $$$1^2 + 2^2 = 5$$$, which is divisible by $$$5$$$;  $$$(1, 3)$$$ and $$$(3, 1)$$$;  $$$(2, 4)$$$ and $$$(4, 2)$$$;  $$$(2, 6)$$$ and $$$(6, 2)$$$;  $$$(3, 4)$$$ and $$$(4, 3)$$$;  $$$(3, 6)$$$ and $$$(6, 3)$$$;  $$$(5, 5)$$$. In the third example, sets in all cells can be divided equally, since $$$m = 1$$$."}, "src_uid": "2ec9e7cddc634d7830575e14363a4657"}
{"nl": {"description": "It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.", "input_spec": "The single line contains integer y (1000\u2009\u2264\u2009y\u2009\u2264\u20099000) \u2014 the year number.", "output_spec": "Print a single integer \u2014 the minimum year number that is strictly larger than y and all it's digits are distinct. It is guaranteed that the answer exists.", "sample_inputs": ["1987", "2013"], "sample_outputs": ["2013", "2014"], "notes": null}, "src_uid": "d62dabfbec52675b7ed7b582ad133acd"}
{"nl": {"description": "Polycarp takes part in a math show. He is given n tasks, each consists of k subtasks, numbered 1 through k. It takes him tj minutes to solve the j-th subtask of any task. Thus, time required to solve a subtask depends only on its index, but not on the task itself. Polycarp can solve subtasks in any order.By solving subtask of arbitrary problem he earns one point. Thus, the number of points for task is equal to the number of solved subtasks in it. Moreover, if Polycarp completely solves the task (solves all k of its subtasks), he recieves one extra point. Thus, total number of points he recieves for the complete solution of the task is k\u2009+\u20091.Polycarp has M minutes of time. What is the maximum number of points he can earn?", "input_spec": "The first line contains three integer numbers n, k and M (1\u2009\u2264\u2009n\u2009\u2264\u200945, 1\u2009\u2264\u2009k\u2009\u2264\u200945, 0\u2009\u2264\u2009M\u2009\u2264\u20092\u00b7109). The second line contains k integer numbers, values tj (1\u2009\u2264\u2009tj\u2009\u2264\u20091000000), where tj is the time in minutes required to solve j-th subtask of any task.", "output_spec": "Print the maximum amount of points Polycarp can earn in M minutes.", "sample_inputs": ["3 4 11\n1 2 3 4", "5 5 10\n1 2 4 8 16"], "sample_outputs": ["6", "7"], "notes": "NoteIn the first example Polycarp can complete the first task and spend 1\u2009+\u20092\u2009+\u20093\u2009+\u20094\u2009=\u200910 minutes. He also has the time to solve one subtask of the second task in one minute.In the second example Polycarp can solve the first subtask of all five tasks and spend 5\u00b71\u2009=\u20095 minutes. Also he can solve the second subtasks of two tasks and spend 2\u00b72\u2009=\u20094 minutes. Thus, he earns 5\u2009+\u20092\u2009=\u20097 points in total."}, "src_uid": "d659e92a410c1bc836be64fc1c0db160"}
{"nl": {"description": "Consider the infinite sequence of integers: 1,\u20091,\u20092,\u20091,\u20092,\u20093,\u20091,\u20092,\u20093,\u20094,\u20091,\u20092,\u20093,\u20094,\u20095.... The sequence is built in the following way: at first the number 1 is written out, then the numbers from 1 to 2, then the numbers from 1 to 3, then the numbers from 1 to 4 and so on. Note that the sequence contains numbers, not digits. For example number 10 first appears in the sequence in position 55 (the elements are numerated from one).Find the number on the n-th position of the sequence.", "input_spec": "The only line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091014) \u2014 the position of the number to find. Note that the given number is too large, so you should use 64-bit integer type to store it. In C++ you can use the long long integer type and in Java you can use long integer type.", "output_spec": "Print the element in the n-th position of the sequence (the elements are numerated from one).", "sample_inputs": ["3", "5", "10", "55", "56"], "sample_outputs": ["2", "2", "4", "10", "1"], "notes": null}, "src_uid": "1db5631847085815461c617854b08ee5"}
{"nl": {"description": "Awruk is taking part in elections in his school. It is the final round. He has only one opponent\u00a0\u2014 Elodreip. The are $$$n$$$ students in the school. Each student has exactly $$$k$$$ votes and is obligated to use all of them. So Awruk knows that if a person gives $$$a_i$$$ votes for Elodreip, than he will get exactly $$$k - a_i$$$ votes from this person. Of course $$$0 \\le k - a_i$$$ holds.Awruk knows that if he loses his life is over. He has been speaking a lot with his friends and now he knows $$$a_1, a_2, \\dots, a_n$$$ \u2014 how many votes for Elodreip each student wants to give. Now he wants to change the number $$$k$$$ to win the elections. Of course he knows that bigger $$$k$$$ means bigger chance that somebody may notice that he has changed something and then he will be disqualified.So, Awruk knows $$$a_1, a_2, \\dots, a_n$$$ \u2014 how many votes each student will give to his opponent. Help him select the smallest winning number $$$k$$$. In order to win, Awruk needs to get strictly more votes than Elodreip.", "input_spec": "The first line contains integer $$$n$$$ ($$$1 \\le n \\le 100$$$)\u00a0\u2014 the number of students in the school. The second line contains $$$n$$$ integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$1 \\leq a_i \\leq 100$$$)\u00a0\u2014 the number of votes each student gives to Elodreip.", "output_spec": "Output the smallest integer $$$k$$$ ($$$k \\ge \\max a_i$$$) which gives Awruk the victory. In order to win, Awruk needs to get strictly more votes than Elodreip.", "sample_inputs": ["5\n1 1 1 5 1", "5\n2 2 3 2 2"], "sample_outputs": ["5", "5"], "notes": "NoteIn the first example, Elodreip gets $$$1 + 1 + 1 + 5 + 1 = 9$$$ votes. The smallest possible $$$k$$$ is $$$5$$$ (it surely can't be less due to the fourth person), and it leads to $$$4 + 4 + 4 + 0 + 4 = 16$$$ votes for Awruk, which is enough to win.In the second example, Elodreip gets $$$11$$$ votes. If $$$k = 4$$$, Awruk gets $$$9$$$ votes and loses to Elodreip."}, "src_uid": "d215b3541d6d728ad01b166aae64faa2"}
{"nl": {"description": "Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.One day Petya dreamt of a lexicographically k-th permutation of integers from 1 to n. Determine how many lucky numbers in the permutation are located on the positions whose indexes are also lucky numbers.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u2009109) \u2014 the number of elements in the permutation and the lexicographical number of the permutation.", "output_spec": "If the k-th permutation of numbers from 1 to n does not exist, print the single number \"-1\" (without the quotes). Otherwise, print the answer to the problem: the number of such indexes i, that i and ai are both lucky numbers.", "sample_inputs": ["7 4", "4 7"], "sample_outputs": ["1", "1"], "notes": "NoteA permutation is an ordered set of n elements, where each integer from 1 to n occurs exactly once. The element of permutation in position with index i is denoted as ai (1\u2009\u2264\u2009i\u2009\u2264\u2009n). Permutation a is lexicographically smaller that permutation b if there is such a i (1\u2009\u2264\u2009i\u2009\u2264\u2009n), that ai\u2009<\u2009bi, and for any j (1\u2009\u2264\u2009j\u2009<\u2009i) aj\u2009=\u2009bj. Let's make a list of all possible permutations of n elements and sort it in the order of lexicographical increasing. Then the lexicographically k-th permutation is the k-th element of this list of permutations.In the first sample the permutation looks like that:1 2 3 4 6 7 5The only suitable position is 4.In the second sample the permutation looks like that:2 1 3 4The only suitable position is 4."}, "src_uid": "cb2aa02772f95fefd1856960b6ceac4c"}
{"nl": {"description": "Vadim loves decorating the Christmas tree, so he got a beautiful garland as a present. It consists of $$$n$$$ light bulbs in a single row. Each bulb has a number from $$$1$$$ to $$$n$$$ (in arbitrary order), such that all the numbers are distinct. While Vadim was solving problems, his home Carp removed some light bulbs from the garland. Now Vadim wants to put them back on.Vadim wants to put all bulb back on the garland. Vadim defines complexity of a garland to be the number of pairs of adjacent bulbs with numbers with different parity (remainder of the division by $$$2$$$). For example, the complexity of 1 4 2 3 5 is $$$2$$$ and the complexity of 1 3 5 7 6 4 2 is $$$1$$$.No one likes complexity, so Vadim wants to minimize the number of such pairs. Find the way to put all bulbs back on the garland, such that the complexity is as small as possible.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 100$$$)\u00a0\u2014 the number of light bulbs on the garland. The second line contains $$$n$$$ integers $$$p_1,\\ p_2,\\ \\ldots,\\ p_n$$$ ($$$0 \\le p_i \\le n$$$)\u00a0\u2014 the number on the $$$i$$$-th bulb, or $$$0$$$ if it was removed.", "output_spec": "Output a single number\u00a0\u2014 the minimum complexity of the garland.", "sample_inputs": ["5\n0 5 0 2 3", "7\n1 0 0 5 0 0 2"], "sample_outputs": ["2", "1"], "notes": "NoteIn the first example, one should place light bulbs as 1 5 4 2 3. In that case, the complexity would be equal to 2, because only $$$(5, 4)$$$ and $$$(2, 3)$$$ are the pairs of adjacent bulbs that have different parity.In the second case, one of the correct answers is 1 7 3 5 6 4 2. "}, "src_uid": "90db6b6548512acfc3da162144169dba"}
{"nl": {"description": "Santa Claus has n candies, he dreams to give them as gifts to children.What is the maximal number of children for whose he can give candies if Santa Claus want each kid should get distinct positive integer number of candies. Santa Class wants to give all n candies he has.", "input_spec": "The only line contains positive integer number n (1\u2009\u2264\u2009n\u2009\u2264\u20091000) \u2014 number of candies Santa Claus has.", "output_spec": "Print to the first line integer number k \u2014 maximal number of kids which can get candies. Print to the second line k distinct integer numbers: number of candies for each of k kid. The sum of k printed numbers should be exactly n. If there are many solutions, print any of them.", "sample_inputs": ["5", "9", "2"], "sample_outputs": ["2\n2 3", "3\n3 5 1", "1\n2"], "notes": null}, "src_uid": "356a7bcebbbd354c268cddbb5454d5fc"}
{"nl": {"description": "Neko is playing with his toys on the backyard of Aki's house. Aki decided to play a prank on him, by secretly putting catnip into Neko's toys. Unfortunately, he went overboard and put an entire bag of catnip into the toys...It took Neko an entire day to turn back to normal. Neko reported to Aki that he saw a lot of weird things, including a trie of all correct bracket sequences of length $$$2n$$$.The definition of correct bracket sequence is as follows:  The empty sequence is a correct bracket sequence,  If $$$s$$$ is a correct bracket sequence, then $$$(\\,s\\,)$$$ is a correct bracket sequence,  If $$$s$$$ and $$$t$$$ are a correct bracket sequence, then $$$st$$$ is also a correct bracket sequence. For example, the strings \"(())\", \"()()\" form a correct bracket sequence, while \")(\" and \"((\" not.Aki then came up with an interesting problem: What is the size of the maximum matching (the largest set of edges such that there are no two edges with a common vertex) in this trie? Since the answer can be quite large, print it modulo $$$10^9 + 7$$$.", "input_spec": "The only line contains a single integer $$$n$$$ ($$$1 \\le n \\le 1000$$$).", "output_spec": "Print exactly one integer\u00a0\u2014 the size of the maximum matching in the trie. Since the answer can be quite large, print it modulo $$$10^9 + 7$$$.", "sample_inputs": ["1", "2", "3"], "sample_outputs": ["1", "3", "9"], "notes": "NoteThe pictures below illustrate tries in the first two examples (for clarity, the round brackets are replaced with angle brackets). The maximum matching is highlighted with blue. \u00a0 "}, "src_uid": "8218255989e5eab73ac7107072c3b2af"}
{"nl": {"description": "Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.Petya loves tickets very much. As we know, each ticket has a number that is a positive integer. Its length equals n (n is always even). Petya calls a ticket lucky if the ticket's number is a lucky number and the sum of digits in the first half (the sum of the first n\u2009/\u20092 digits) equals the sum of digits in the second half (the sum of the last n\u2009/\u20092 digits). Check if the given ticket is lucky.", "input_spec": "The first line contains an even integer n (2\u2009\u2264\u2009n\u2009\u2264\u200950) \u2014 the length of the ticket number that needs to be checked. The second line contains an integer whose length equals exactly n \u2014 the ticket number. The number may contain leading zeros.", "output_spec": "On the first line print \"YES\" if the given ticket number is lucky. Otherwise, print \"NO\" (without the quotes).", "sample_inputs": ["2\n47", "4\n4738", "4\n4774"], "sample_outputs": ["NO", "NO", "YES"], "notes": "NoteIn the first sample the sum of digits in the first half does not equal the sum of digits in the second half (4\u2009\u2260\u20097).In the second sample the ticket number is not the lucky number."}, "src_uid": "435b6d48f99d90caab828049a2c9e2a7"}
{"nl": {"description": "InputThe input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.OutputOutput \"YES\" or \"NO\".ExamplesInput\nNEAT\nOutput\nYES\nInput\nWORD\nOutput\nNO\nInput\nCODER\nOutput\nNO\nInput\nAPRILFOOL\nOutput\nNO\nInput\nAI\nOutput\nYES\nInput\nJUROR\nOutput\nYES\nInput\nYES\nOutput\nNO\n", "input_spec": "The input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.", "output_spec": "Output \"YES\" or \"NO\".", "sample_inputs": ["NEAT", "WORD", "CODER", "APRILFOOL", "AI", "JUROR", "YES"], "sample_outputs": ["YES", "NO", "NO", "NO", "YES", "YES", "NO"], "notes": null}, "src_uid": "15008dcb8dc8506c39aef0e3d8fca70c"}
{"nl": {"description": "Nick is interested in prime numbers. Once he read about Goldbach problem. It states that every even integer greater than 2 can be expressed as the sum of two primes. That got Nick's attention and he decided to invent a problem of his own and call it Noldbach problem. Since Nick is interested only in prime numbers, Noldbach problem states that at least k prime numbers from 2 to n inclusively can be expressed as the sum of three integer numbers: two neighboring prime numbers and 1. For example, 19 = 7 + 11 + 1, or 13 = 5 + 7 + 1.Two prime numbers are called neighboring if there are no other prime numbers between them.You are to help Nick, and find out if he is right or wrong.", "input_spec": "The first line of the input contains two integers n (2\u2009\u2264\u2009n\u2009\u2264\u20091000) and k (0\u2009\u2264\u2009k\u2009\u2264\u20091000).", "output_spec": "Output YES if at least k prime numbers from 2 to n inclusively can be expressed as it was described above. Otherwise output NO.", "sample_inputs": ["27 2", "45 7"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first sample the answer is YES since at least two numbers can be expressed as it was described (for example, 13 and 19). In the second sample the answer is NO since it is impossible to express 7 prime numbers from 2 to 45 in the desired form."}, "src_uid": "afd2b818ed3e2a931da9d682f6ad660d"}
{"nl": {"description": "One day Kefa found n baloons. For convenience, we denote color of i-th baloon as si \u2014 lowercase letter of the Latin alphabet. Also Kefa has k friends. Friend will be upset, If he get two baloons of the same color. Kefa want to give out all baloons to his friends. Help Kefa to find out, can he give out all his baloons, such that no one of his friens will be upset \u2014 print \u00abYES\u00bb, if he can, and \u00abNO\u00bb, otherwise. Note, that Kefa's friend will not upset, if he doesn't get baloons at all.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u2009100) \u2014 the number of baloons and friends. Next line contains string s \u2014 colors of baloons.", "output_spec": "Answer to the task \u2014 \u00abYES\u00bb or \u00abNO\u00bb in a single line. You can choose the case (lower or upper) for each letter arbitrary.", "sample_inputs": ["4 2\naabb", "6 3\naacaab"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first sample Kefa can give 1-st and 3-rd baloon to the first friend, and 2-nd and 4-th to the second.In the second sample Kefa needs to give to all his friends baloons of color a, but one baloon will stay, thats why answer is \u00abNO\u00bb."}, "src_uid": "ceb3807aaffef60bcdbcc9a17a1391be"}
{"nl": {"description": "Petya started to attend programming lessons. On the first lesson his task was to write a simple program. The program was supposed to do the following: in the given string, consisting if uppercase and lowercase Latin letters, it:   deletes all the vowels,  inserts a character \".\" before each consonant,  replaces all uppercase consonants with corresponding lowercase ones. Vowels are letters \"A\", \"O\", \"Y\", \"E\", \"U\", \"I\", and the rest are consonants. The program's input is exactly one string, it should return the output as a single string, resulting after the program's processing the initial string.Help Petya cope with this easy task.", "input_spec": "The first line represents input string of Petya's program. This string only consists of uppercase and lowercase Latin letters and its length is from 1 to 100, inclusive.", "output_spec": "Print the resulting string. It is guaranteed that this string is not empty.", "sample_inputs": ["tour", "Codeforces", "aBAcAba"], "sample_outputs": [".t.r", ".c.d.f.r.c.s", ".b.c.b"], "notes": null}, "src_uid": "db9520e85b3e9186dd3a09ff8d1e8c1b"}
{"nl": {"description": "Shapur was an extremely gifted student. He was great at everything including Combinatorics, Algebra, Number Theory, Geometry, Calculus, etc. He was not only smart but extraordinarily fast! He could manage to sum 1018 numbers in a single second.One day in 230 AD Shapur was trying to find out if any one can possibly do calculations faster than him. As a result he made a very great contest and asked every one to come and take part.In his contest he gave the contestants many different pairs of numbers. Each number is made from digits 0 or 1. The contestants should write a new number corresponding to the given pair of numbers. The rule is simple: The i-th digit of the answer is 1 if and only if the i-th digit of the two given numbers differ. In the other case the i-th digit of the answer is 0.Shapur made many numbers and first tried his own speed. He saw that he can perform these operations on numbers of length \u221e (length of a number is number of digits in it) in a glance! He always gives correct answers so he expects the contestants to give correct answers, too. He is a good fellow so he won't give anyone very big numbers and he always gives one person numbers of same length.Now you are going to take part in Shapur's contest. See if you are faster and more accurate.", "input_spec": "There are two lines in each input. Each of them contains a single number. It is guaranteed that the numbers are made from 0 and 1 only and that their length is same. The numbers may start with 0. The length of each number doesn't exceed 100.", "output_spec": "Write one line \u2014 the corresponding answer. Do not omit the leading 0s.", "sample_inputs": ["1010100\n0100101", "000\n111", "1110\n1010", "01110\n01100"], "sample_outputs": ["1110001", "111", "0100", "00010"], "notes": null}, "src_uid": "3714b7596a6b48ca5b7a346f60d90549"}
{"nl": {"description": "On the planet Mars a year lasts exactly n days (there are no leap years on Mars). But Martians have the same weeks as earthlings\u00a0\u2014 5 work days and then 2 days off. Your task is to determine the minimum possible and the maximum possible number of days off per year on Mars.", "input_spec": "The first line of the input contains a positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091\u2009000\u2009000)\u00a0\u2014 the number of days in a year on Mars.", "output_spec": "Print two integers\u00a0\u2014 the minimum possible and the maximum possible number of days off per year on Mars.", "sample_inputs": ["14", "2"], "sample_outputs": ["4 4", "0 2"], "notes": "NoteIn the first sample there are 14 days in a year on Mars, and therefore independently of the day a year starts with there will be exactly 4 days off .In the second sample there are only 2 days in a year on Mars, and they can both be either work days or days off."}, "src_uid": "8152daefb04dfa3e1a53f0a501544c35"}
{"nl": {"description": "You are given a sequence of integers $$$a_1, a_2, \\dots, a_n$$$. You need to paint elements in colors, so that:   If we consider any color, all elements of this color must be divisible by the minimal element of this color.  The number of used colors must be minimized. For example, it's fine to paint elements $$$[40, 10, 60]$$$ in a single color, because they are all divisible by $$$10$$$. You can use any color an arbitrary amount of times (in particular, it is allowed to use a color only once). The elements painted in one color do not need to be consecutive.For example, if $$$a=[6, 2, 3, 4, 12]$$$ then two colors are required: let's paint $$$6$$$, $$$3$$$ and $$$12$$$ in the first color ($$$6$$$, $$$3$$$ and $$$12$$$ are divisible by $$$3$$$) and paint $$$2$$$ and $$$4$$$ in the second color ($$$2$$$ and $$$4$$$ are divisible by $$$2$$$). For example, if $$$a=[10, 7, 15]$$$ then $$$3$$$ colors are required (we can simply paint each element in an unique color).", "input_spec": "The first line contains an integer $$$n$$$ ($$$1 \\le n \\le 100$$$), where $$$n$$$ is the length of the given sequence. The second line contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 100$$$). These numbers can contain duplicates.", "output_spec": "Print the minimal number of colors to paint all the given numbers in a valid way.", "sample_inputs": ["6\n10 2 3 5 4 2", "4\n100 100 100 100", "8\n7 6 5 4 3 2 2 3"], "sample_outputs": ["3", "1", "4"], "notes": "NoteIn the first example, one possible way to paint the elements in $$$3$$$ colors is:  paint in the first color the elements: $$$a_1=10$$$ and $$$a_4=5$$$,  paint in the second color the element $$$a_3=3$$$,  paint in the third color the elements: $$$a_2=2$$$, $$$a_5=4$$$ and $$$a_6=2$$$. In the second example, you can use one color to paint all the elements.In the third example, one possible way to paint the elements in $$$4$$$ colors is:  paint in the first color the elements: $$$a_4=4$$$, $$$a_6=2$$$ and $$$a_7=2$$$,  paint in the second color the elements: $$$a_2=6$$$, $$$a_5=3$$$ and $$$a_8=3$$$,  paint in the third color the element $$$a_3=5$$$,  paint in the fourth color the element $$$a_1=7$$$. "}, "src_uid": "63d9b7416aa96129c57d20ec6145e0cd"}
{"nl": {"description": "Our good friend Mole is trying to code a big message. He is typing on an unusual keyboard with characters arranged in following way:qwertyuiopasdfghjkl;zxcvbnm,./Unfortunately Mole is blind, so sometimes it is problem for him to put his hands accurately. He accidentally moved both his hands with one position to the left or to the right. That means that now he presses not a button he wants, but one neighboring button (left or right, as specified in input).We have a sequence of characters he has typed and we want to find the original message.", "input_spec": "First line of the input contains one letter describing direction of shifting ('L' or 'R' respectively for left or right). Second line contains a sequence of characters written by Mole. The size of this sequence will be no more than 100. Sequence contains only symbols that appear on Mole's keyboard. It doesn't contain spaces as there is no space on Mole's keyboard. It is guaranteed that even though Mole hands are moved, he is still pressing buttons on keyboard and not hitting outside it.", "output_spec": "Print a line that contains the original message.", "sample_inputs": ["R\ns;;upimrrfod;pbr"], "sample_outputs": ["allyouneedislove"], "notes": null}, "src_uid": "df49c0c257903516767fdb8ac9c2bfd6"}
{"nl": {"description": "Unlucky year in Berland is such a year that its number n can be represented as n\u2009=\u2009xa\u2009+\u2009yb, where a and b are non-negative integer numbers. For example, if x\u2009=\u20092 and y\u2009=\u20093 then the years 4 and 17 are unlucky (4\u2009=\u200920\u2009+\u200931, 17\u2009=\u200923\u2009+\u200932\u2009=\u200924\u2009+\u200930) and year 18 isn't unlucky as there is no such representation for it.Such interval of years that there are no unlucky years in it is called The Golden Age.You should write a program which will find maximum length of The Golden Age which starts no earlier than the year l and ends no later than the year r. If all years in the interval [l,\u2009r] are unlucky then the answer is 0.", "input_spec": "The first line contains four integer numbers x, y, l and r (2\u2009\u2264\u2009x,\u2009y\u2009\u2264\u20091018, 1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u20091018).", "output_spec": "Print the maximum length of The Golden Age within the interval [l,\u2009r]. If all years in the interval [l,\u2009r] are unlucky then print 0.", "sample_inputs": ["2 3 1 10", "3 5 10 22", "2 3 3 5"], "sample_outputs": ["1", "8", "0"], "notes": "NoteIn the first example the unlucky years are 2, 3, 4, 5, 7, 9 and 10. So maximum length of The Golden Age is achived in the intervals [1,\u20091], [6,\u20096] and [8,\u20098].In the second example the longest Golden Age is the interval [15,\u200922]."}, "src_uid": "68ca8a8730db27ac2230f9fe9b120f5f"}
{"nl": {"description": "Alice has a lovely piece of cloth. It has the shape of a square with a side of length $$$a$$$ centimeters. Bob also wants such piece of cloth. He would prefer a square with a side of length $$$b$$$ centimeters (where $$$b < a$$$). Alice wanted to make Bob happy, so she cut the needed square out of the corner of her piece and gave it to Bob. Now she is left with an ugly L shaped cloth (see pictures below).Alice would like to know whether the area of her cloth expressed in square centimeters is prime. Could you help her to determine it?", "input_spec": "The first line contains a number $$$t$$$\u00a0($$$1 \\leq t \\leq 5$$$)\u00a0\u2014 the number of test cases. Each of the next $$$t$$$ lines describes the $$$i$$$-th test case. It contains two integers $$$a$$$ and $$$b~(1 \\leq b < a \\leq 10^{11})$$$\u00a0\u2014 the side length of Alice's square and the side length of the square that Bob wants.", "output_spec": "Print $$$t$$$ lines, where the $$$i$$$-th line is the answer to the $$$i$$$-th test case. Print \"YES\" (without quotes) if the area of the remaining piece of cloth is prime, otherwise print \"NO\". You can print each letter in an arbitrary case (upper or lower).", "sample_inputs": ["4\n6 5\n16 13\n61690850361 24777622630\n34 33"], "sample_outputs": ["YES\nNO\nNO\nYES"], "notes": "NoteThe figure below depicts the first test case. The blue part corresponds to the piece which belongs to Bob, and the red part is the piece that Alice keeps for herself. The area of the red part is $$$6^2 - 5^2 = 36 - 25 = 11$$$, which is prime, so the answer is \"YES\".  In the second case, the area is $$$16^2 - 13^2 = 87$$$, which is divisible by $$$3$$$.  In the third case, the area of the remaining piece is $$$61690850361^2 - 24777622630^2 = 3191830435068605713421$$$. This number is not prime because $$$3191830435068605713421 = 36913227731 \\cdot 86468472991 $$$.In the last case, the area is $$$34^2 - 33^2 = 67$$$."}, "src_uid": "5a052e4e6c64333d94c83df890b1183c"}
{"nl": {"description": "Natasha is going to fly to Mars. She needs to build a rocket, which consists of several stages in some order. Each of the stages is defined by a lowercase Latin letter. This way, the rocket can be described by the string\u00a0\u2014 concatenation of letters, which correspond to the stages.There are $$$n$$$ stages available. The rocket must contain exactly $$$k$$$ of them. Stages in the rocket should be ordered by their weight. So, after the stage with some letter can go only stage with a letter, which is at least two positions after in the alphabet (skipping one letter in between, or even more). For example, after letter 'c' can't go letters 'a', 'b', 'c' and 'd', but can go letters 'e', 'f', ..., 'z'.For the rocket to fly as far as possible, its weight should be minimal. The weight of the rocket is equal to the sum of the weights of its stages. The weight of the stage is the number of its letter in the alphabet. For example, the stage 'a 'weighs one ton,' b 'weighs two tons, and' z'\u00a0\u2014 $$$26$$$ tons.Build the rocket with the minimal weight or determine, that it is impossible to build a rocket at all. Each stage can be used at most once.", "input_spec": "The first line of input contains two integers\u00a0\u2014 $$$n$$$ and $$$k$$$ ($$$1 \\le k \\le n \\le 50$$$)\u00a0\u2013 the number of available stages and the number of stages to use in the rocket. The second line contains string $$$s$$$, which consists of exactly $$$n$$$ lowercase Latin letters. Each letter defines a new stage, which can be used to build the rocket. Each stage can be used at most once.", "output_spec": "Print a single integer\u00a0\u2014 the minimal total weight of the rocket or -1, if it is impossible to build the rocket at all.", "sample_inputs": ["5 3\nxyabd", "7 4\nproblem", "2 2\nab", "12 1\nabaabbaaabbb"], "sample_outputs": ["29", "34", "-1", "1"], "notes": "NoteIn the first example, the following rockets satisfy the condition: \"adx\" (weight is $$$1+4+24=29$$$); \"ady\" (weight is $$$1+4+25=30$$$); \"bdx\" (weight is $$$2+4+24=30$$$); \"bdy\" (weight is $$$2+4+25=31$$$).Rocket \"adx\" has the minimal weight, so the answer is $$$29$$$.In the second example, target rocket is \"belo\". Its weight is $$$2+5+12+15=34$$$.In the third example, $$$n=k=2$$$, so the rocket must have both stages: 'a' and 'b'. This rocket doesn't satisfy the condition, because these letters are adjacent in the alphabet. Answer is -1."}, "src_uid": "56b13d313afef9dc6c6ba2758b5ea313"}
{"nl": {"description": "Like any unknown mathematician, Yuri has favourite numbers: $$$A$$$, $$$B$$$, $$$C$$$, and $$$D$$$, where $$$A \\leq B \\leq C \\leq D$$$. Yuri also likes triangles and once he thought: how many non-degenerate triangles with integer sides $$$x$$$, $$$y$$$, and $$$z$$$ exist, such that $$$A \\leq x \\leq B \\leq y \\leq C \\leq z \\leq D$$$ holds?Yuri is preparing problems for a new contest now, so he is very busy. That's why he asked you to calculate the number of triangles with described property.The triangle is called non-degenerate if and only if its vertices are not collinear.", "input_spec": "The first line contains four integers: $$$A$$$, $$$B$$$, $$$C$$$ and $$$D$$$ ($$$1 \\leq A \\leq B \\leq C \\leq D \\leq 5 \\cdot 10^5$$$)\u00a0\u2014 Yuri's favourite numbers.", "output_spec": "Print the number of non-degenerate triangles with integer sides $$$x$$$, $$$y$$$, and $$$z$$$ such that the inequality $$$A \\leq x \\leq B \\leq y \\leq C \\leq z \\leq D$$$ holds.", "sample_inputs": ["1 2 3 4", "1 2 2 5", "500000 500000 500000 500000"], "sample_outputs": ["4", "3", "1"], "notes": "NoteIn the first example Yuri can make up triangles with sides $$$(1, 3, 3)$$$, $$$(2, 2, 3)$$$, $$$(2, 3, 3)$$$ and $$$(2, 3, 4)$$$.In the second example Yuri can make up triangles with sides $$$(1, 2, 2)$$$, $$$(2, 2, 2)$$$ and $$$(2, 2, 3)$$$.In the third example Yuri can make up only one equilateral triangle with sides equal to $$$5 \\cdot 10^5$$$."}, "src_uid": "4f92791b9ec658829f667fcea1faee01"}
{"nl": {"description": "Polycarpus is an amateur businessman. Recently he was surprised to find out that the market for paper scissors is completely free! Without further ado, Polycarpus decided to start producing and selling such scissors.Polycaprus calculated that the optimal celling price for such scissors would be p bourles. However, he read somewhere that customers are attracted by prices that say something like \"Special Offer! Super price 999 bourles!\". So Polycarpus decided to lower the price a little if it leads to the desired effect.Polycarpus agrees to lower the price by no more than d bourles so that the number of nines at the end of the resulting price is maximum. If there are several ways to do it, he chooses the maximum possible price.Note, Polycarpus counts only the trailing nines in a price.", "input_spec": "The first line contains two integers p and d (1\u2009\u2264\u2009p\u2009\u2264\u20091018; 0\u2009\u2264\u2009d\u2009<\u2009p) \u2014 the initial price of scissors and the maximum possible price reduction. Please, do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specifier.", "output_spec": "Print the required price \u2014 the maximum price that ends with the largest number of nines and that is less than p by no more than d. The required number shouldn't have leading zeroes.", "sample_inputs": ["1029 102", "27191 17"], "sample_outputs": ["999", "27189"], "notes": null}, "src_uid": "c706cfcd4c37fbc1b1631aeeb2c02b6a"}
{"nl": {"description": "Mr. Bender has a digital table of size n\u2009\u00d7\u2009n, each cell can be switched on or off. He wants the field to have at least c switched on squares. When this condition is fulfilled, Mr Bender will be happy.We'll consider the table rows numbered from top to bottom from 1 to n, and the columns \u2014 numbered from left to right from 1 to n. Initially there is exactly one switched on cell with coordinates (x,\u2009y) (x is the row number, y is the column number), and all other cells are switched off. Then each second we switch on the cells that are off but have the side-adjacent cells that are on.For a cell with coordinates (x,\u2009y) the side-adjacent cells are cells with coordinates (x\u2009-\u20091,\u2009y), (x\u2009+\u20091,\u2009y), (x,\u2009y\u2009-\u20091), (x,\u2009y\u2009+\u20091).In how many seconds will Mr. Bender get happy?", "input_spec": "The first line contains four space-separated integers n,\u2009x,\u2009y,\u2009c (1\u2009\u2264\u2009n,\u2009c\u2009\u2264\u2009109;\u00a01\u2009\u2264\u2009x,\u2009y\u2009\u2264\u2009n;\u00a0c\u2009\u2264\u2009n2).", "output_spec": "In a single line print a single integer \u2014 the answer to the problem.", "sample_inputs": ["6 4 3 1", "9 3 8 10"], "sample_outputs": ["0", "2"], "notes": "NoteInitially the first test has one painted cell, so the answer is 0. In the second test all events will go as is shown on the figure. ."}, "src_uid": "232c5206ee7c1903556c3625e0b0efc6"}
{"nl": {"description": "Today, Osama gave Fadi an integer $$$X$$$, and Fadi was wondering about the minimum possible value of $$$max(a, b)$$$ such that $$$LCM(a, b)$$$ equals $$$X$$$. Both $$$a$$$ and $$$b$$$ should be positive integers.$$$LCM(a, b)$$$ is the smallest positive integer that is divisible by both $$$a$$$ and $$$b$$$. For example, $$$LCM(6, 8) = 24$$$, $$$LCM(4, 12) = 12$$$, $$$LCM(2, 3) = 6$$$.Of course, Fadi immediately knew the answer. Can you be just like Fadi and find any such pair?", "input_spec": "The first and only line contains an integer $$$X$$$ ($$$1 \\le X \\le 10^{12}$$$).", "output_spec": "Print two positive integers, $$$a$$$ and $$$b$$$, such that the value of $$$max(a, b)$$$ is minimum possible and $$$LCM(a, b)$$$ equals $$$X$$$. If there are several possible such pairs, you can print any.", "sample_inputs": ["2", "6", "4", "1"], "sample_outputs": ["1 2", "2 3", "1 4", "1 1"], "notes": null}, "src_uid": "e504a04cefef3da093573f9df711bcea"}
{"nl": {"description": "String can be called correct if it consists of characters \"0\" and \"1\" and there are no redundant leading zeroes. Here are some examples: \"0\", \"10\", \"1001\".You are given a correct string s.You can perform two different operations on this string:   swap any pair of adjacent characters (for example, \"101\"  \"110\");  replace \"11\" with \"1\" (for example, \"110\"  \"10\"). Let val(s) be such a number that s is its binary representation.Correct string a is less than some other correct string b iff val(a)\u2009<\u2009val(b).Your task is to find the minimum correct string that you can obtain from the given one using the operations described above. You can use these operations any number of times in any order (or even use no operations at all).", "input_spec": "The first line contains integer number n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the length of string s. The second line contains the string s consisting of characters \"0\" and \"1\". It is guaranteed that the string s is correct.", "output_spec": "Print one string \u2014 the minimum correct string that you can obtain from the given one.", "sample_inputs": ["4\n1001", "1\n1"], "sample_outputs": ["100", "1"], "notes": "NoteIn the first example you can obtain the answer by the following sequence of operations: \"1001\"  \"1010\"  \"1100\"  \"100\".In the second example you can't obtain smaller answer no matter what operations you use."}, "src_uid": "ac244791f8b648d672ed3de32ce0074d"}
{"nl": {"description": "Note that the memory limit in this problem is lower than in others.You have a vertical strip with $$$n$$$ cells, numbered consecutively from $$$1$$$ to $$$n$$$ from top to bottom.You also have a token that is initially placed in cell $$$n$$$. You will move the token up until it arrives at cell $$$1$$$.Let the token be in cell $$$x > 1$$$ at some moment. One shift of the token can have either of the following kinds:   Subtraction: you choose an integer $$$y$$$ between $$$1$$$ and $$$x-1$$$, inclusive, and move the token from cell $$$x$$$ to cell $$$x - y$$$.  Floored division: you choose an integer $$$z$$$ between $$$2$$$ and $$$x$$$, inclusive, and move the token from cell $$$x$$$ to cell $$$\\lfloor \\frac{x}{z} \\rfloor$$$ ($$$x$$$ divided by $$$z$$$ rounded down). Find the number of ways to move the token from cell $$$n$$$ to cell $$$1$$$ using one or more shifts, and print it modulo $$$m$$$. Note that if there are several ways to move the token from one cell to another in one shift, all these ways are considered distinct (check example explanation for a better understanding).", "input_spec": "The only line contains two integers $$$n$$$ and $$$m$$$ ($$$2 \\le n \\le 4 \\cdot 10^6$$$; $$$10^8 < m < 10^9$$$; $$$m$$$ is a prime number)\u00a0\u2014 the length of the strip and the modulo.", "output_spec": "Print the number of ways to move the token from cell $$$n$$$ to cell $$$1$$$, modulo $$$m$$$.", "sample_inputs": ["3 998244353", "5 998244353", "42 998244353", "787788 100000007"], "sample_outputs": ["5", "25", "793019428", "94810539"], "notes": "NoteIn the first test, there are three ways to move the token from cell $$$3$$$ to cell $$$1$$$ in one shift: using subtraction of $$$y = 2$$$, or using division by $$$z = 2$$$ or $$$z = 3$$$.There are also two ways to move the token from cell $$$3$$$ to cell $$$1$$$ via cell $$$2$$$: first subtract $$$y = 1$$$, and then either subtract $$$y = 1$$$ again or divide by $$$z = 2$$$.Therefore, there are five ways in total."}, "src_uid": "77443424be253352aaf2b6c89bdd4671"}
{"nl": {"description": "A very tense moment: n cowboys stand in a circle and each one points his colt at a neighbor. Each cowboy can point the colt to the person who follows or precedes him in clockwise direction. Human life is worthless, just like in any real western.The picture changes each second! Every second the cowboys analyse the situation and, if a pair of cowboys realize that they aim at each other, they turn around. In a second all such pairs of neighboring cowboys aiming at each other turn around. All actions happen instantaneously and simultaneously in a second.We'll use character \"A\" to denote a cowboy who aims at his neighbour in the clockwise direction, and character \"B\" for a cowboy who aims at his neighbour in the counter clockwise direction. Then a string of letters \"A\" and \"B\" will denote the circle of cowboys, the record is made from the first of them in a clockwise direction.For example, a circle that looks like \"ABBBABBBA\" after a second transforms into \"BABBBABBA\" and a circle that looks like \"BABBA\" transforms into \"ABABB\".     This picture illustrates how the circle \"BABBA\" transforms into \"ABABB\"  A second passed and now the cowboys' position is described by string s. Your task is to determine the number of possible states that lead to s in a second. Two states are considered distinct if there is a cowboy who aims at his clockwise neighbor in one state and at his counter clockwise neighbor in the other state.", "input_spec": "The input data consists of a single string s. Its length is from 3 to 100 characters, inclusive. Line s consists of letters \"A\" and \"B\".", "output_spec": "Print the sought number of states.", "sample_inputs": ["BABBBABBA", "ABABB", "ABABAB"], "sample_outputs": ["2", "2", "4"], "notes": "NoteIn the first sample the possible initial states are \"ABBBABBAB\" and \"ABBBABBBA\".In the second sample the possible initial states are \"AABBB\" and \"BABBA\"."}, "src_uid": "ad27d991516054ea473b384bb2563b38"}
{"nl": {"description": "Not so long ago as a result of combat operations the main Berland place of interest \u2014 the magic clock \u2014 was damaged. The cannon's balls made several holes in the clock, that's why the residents are concerned about the repair. The magic clock can be represented as an infinite Cartesian plane, where the origin corresponds to the clock center. The clock was painted two colors as is shown in the picture:  The picture shows only the central part of the clock. This coloring naturally extends to infinity.The balls can be taken to be points on the plane. Your task is to find the color of the area, damaged by the given ball.All the points located on the border of one of the areas have to be considered painted black.", "input_spec": "The first and single line contains two integers x and y \u2014 the coordinates of the hole made in the clock by the ball. Each of the numbers x and y has an absolute value that does not exceed 1000.", "output_spec": "Find the required color. All the points between which and the origin of coordinates the distance is integral-value are painted black.", "sample_inputs": ["-2 1", "2 1", "4 3"], "sample_outputs": ["white", "black", "black"], "notes": null}, "src_uid": "8c92aac1bef5822848a136a1328346c6"}
{"nl": {"description": "A breakthrough among computer games, \"Civilization XIII\", is striking in its scale and elaborate details. Let's take a closer look at one of them.The playing area in the game is split into congruent cells that are regular hexagons. The side of each cell is equal to 1. Each unit occupies exactly one cell of the playing field. The field can be considered infinite. Let's take a look at the battle unit called an \"Archer\". Each archer has a parameter \"shot range\". It's a positive integer that determines the radius of the circle in which the archer can hit a target. The center of the circle coincides with the center of the cell in which the archer stays. A cell is considered to be under the archer\u2019s fire if and only if all points of this cell, including border points are located inside the circle or on its border.The picture below shows the borders for shot ranges equal to 3, 4 and 5. The archer is depicted as A.   Find the number of cells that are under fire for some archer.", "input_spec": "The first and only line of input contains a single positive integer k \u2014 the archer's shot range (1\u2009\u2264\u2009k\u2009\u2264\u2009106).", "output_spec": "Print the single number, the number of cells that are under fire. Please do not use the %lld specificator to read or write 64-bit integers in C++. It is preferred to use the cout stream (also you may use the %I64d specificator).", "sample_inputs": ["3", "4", "5"], "sample_outputs": ["7", "13", "19"], "notes": null}, "src_uid": "6787c7631716ce3dff3f9a5e1c51ff13"}
{"nl": {"description": "Yet another education system reform has been carried out in Berland recently. The innovations are as follows:An academic year now consists of n days. Each day pupils study exactly one of m subjects, besides, each subject is studied for no more than one day. After the lessons of the i-th subject pupils get the home task that contains no less than ai and no more than bi exercises. Besides, each subject has a special attribute, the complexity (ci). A school can make its own timetable, considering the following conditions are satisfied:  the timetable should contain the subjects in the order of the complexity's strict increasing;  each day, except for the first one, the task should contain either k times more exercises, or more by k compared to the previous day (more formally: let's call the number of home task exercises in the i-th day as xi, then for each i (1\u2009<\u2009i\u2009\u2264\u2009n): either xi\u2009=\u2009k\u2009+\u2009xi\u2009-\u20091 or xi\u2009=\u2009k\u00b7xi\u2009-\u20091 must be true);  the total number of exercises in all home tasks should be maximal possible. All limitations are separately set for each school.It turned out that in many cases ai and bi reach 1016 (however, as the Berland Minister of Education is famous for his love to half-measures, the value of bi\u2009-\u2009ai doesn't exceed 100). That also happened in the Berland School \u2116256. Nevertheless, you as the school's principal still have to work out the timetable for the next academic year...", "input_spec": "The first line contains three integers n, m, k (1\u2009\u2264\u2009n\u2009\u2264\u2009m\u2009\u2264\u200950, 1\u2009\u2264\u2009k\u2009\u2264\u2009100) which represent the number of days in an academic year, the number of subjects and the k parameter correspondingly. Each of the following m lines contains the description of a subject as three integers ai, bi, ci (1\u2009\u2264\u2009ai\u2009\u2264\u2009bi\u2009\u2264\u20091016, bi\u2009-\u2009ai\u2009\u2264\u2009100, 1\u2009\u2264\u2009ci\u2009\u2264\u2009100) \u2014 two limitations to the number of exercises on the i-th subject and the complexity of the i-th subject, correspondingly. Distinct subjects can have the same complexity. The subjects are numbered with integers from 1 to m.  Please do not use the %lld specificator to read or write 64-bit numbers in \u0421++. It is preferred to use the cin stream or the %I64d specificator.", "output_spec": "If no valid solution exists, print the single word \"NO\" (without the quotes). Otherwise, the first line should contain the word \"YES\" (without the quotes) and the next n lines should contain any timetable that satisfies all the conditions. The i\u2009+\u20091-th line should contain two positive integers: the number of the subject to study on the i-th day and the number of home task exercises given for this subject. The timetable should contain exactly n subjects.", "sample_inputs": ["4 5 2\n1 10 1\n1 10 2\n1 10 3\n1 20 4\n1 100 5", "3 4 3\n1 3 1\n2 4 4\n2 3 3\n2 2 2"], "sample_outputs": ["YES\n2 8\n3 10\n4 20\n5 40", "NO"], "notes": null}, "src_uid": "c98fdad8e7ce09b8ac389108f72cecd9"}
{"nl": {"description": "Grandma Laura came to the market to sell some apples. During the day she sold all the apples she had. But grandma is old, so she forgot how many apples she had brought to the market.She precisely remembers she had n buyers and each of them bought exactly half of the apples she had at the moment of the purchase and also she gave a half of an apple to some of them as a gift (if the number of apples at the moment of purchase was odd), until she sold all the apples she had.So each buyer took some integral positive number of apples, but maybe he didn't pay for a half of an apple (if the number of apples at the moment of the purchase was odd).For each buyer grandma remembers if she gave a half of an apple as a gift or not. The cost of an apple is p (the number p is even).Print the total money grandma should have at the end of the day to check if some buyers cheated her.", "input_spec": "The first line contains two integers n and p (1\u2009\u2264\u2009n\u2009\u2264\u200940,\u20092\u2009\u2264\u2009p\u2009\u2264\u20091000) \u2014 the number of the buyers and the cost of one apple. It is guaranteed that the number p is even. The next n lines contains the description of buyers. Each buyer is described with the string half if he simply bought half of the apples and with the string halfplus if grandma also gave him a half of an apple as a gift. It is guaranteed that grandma has at least one apple at the start of the day and she has no apples at the end of the day.", "output_spec": "Print the only integer a \u2014 the total money grandma should have at the end of the day. Note that the answer can be too large, so you should use 64-bit integer type to store it. In C++ you can use the long long integer type and in Java you can use long integer type.", "sample_inputs": ["2 10\nhalf\nhalfplus", "3 10\nhalfplus\nhalfplus\nhalfplus"], "sample_outputs": ["15", "55"], "notes": "NoteIn the first sample at the start of the day the grandma had two apples. First she sold one apple and then she sold a half of the second apple and gave a half of the second apple as a present to the second buyer."}, "src_uid": "6330891dd05bb70241e2a052f5bf5a58"}
{"nl": {"description": "You all know the Dirichlet principle, the point of which is that if n boxes have no less than n\u2009+\u20091 items, that leads to the existence of a box in which there are at least two items.Having heard of that principle, but having not mastered the technique of logical thinking, 8 year olds Stas and Masha invented a game. There are a different boxes and b different items, and each turn a player can either add a new box or a new item. The player, after whose turn the number of ways of putting b items into a boxes becomes no less then a certain given number n, loses. All the boxes and items are considered to be different. Boxes may remain empty.Who loses if both players play optimally and Stas's turn is first?", "input_spec": "The only input line has three integers a,\u2009b,\u2009n (1\u2009\u2264\u2009a\u2009\u2264\u200910000, 1\u2009\u2264\u2009b\u2009\u2264\u200930, 2\u2009\u2264\u2009n\u2009\u2264\u2009109) \u2014 the initial number of the boxes, the number of the items and the number which constrains the number of ways, respectively. Guaranteed that the initial number of ways is strictly less than n.", "output_spec": "Output \"Stas\" if Masha wins. Output \"Masha\" if Stas wins. In case of a draw, output \"Missing\".", "sample_inputs": ["2 2 10", "5 5 16808", "3 1 4", "1 4 10"], "sample_outputs": ["Masha", "Masha", "Stas", "Missing"], "notes": "NoteIn the second example the initial number of ways is equal to 3125.   If Stas increases the number of boxes, he will lose, as Masha may increase the number of boxes once more during her turn. After that any Stas's move will lead to defeat.  But if Stas increases the number of items, then any Masha's move will be losing. "}, "src_uid": "cffd5c0b7b659649f3bf9f2dbd20ad6b"}
{"nl": {"description": "A permutation p of size n is an array such that every integer from 1 to n occurs exactly once in this array.Let's call a permutation an almost identity permutation iff there exist at least n\u2009-\u2009k indices i (1\u2009\u2264\u2009i\u2009\u2264\u2009n) such that pi\u2009=\u2009i.Your task is to count the number of almost identity permutations for given numbers n and k.", "input_spec": "The first line contains two integers n and k (4\u2009\u2264\u2009n\u2009\u2264\u20091000, 1\u2009\u2264\u2009k\u2009\u2264\u20094).", "output_spec": "Print the number of almost identity permutations for given n and k.", "sample_inputs": ["4 1", "4 2", "5 3", "5 4"], "sample_outputs": ["1", "7", "31", "76"], "notes": null}, "src_uid": "96d839dc2d038f8ae95fc47c217b2e2f"}
{"nl": {"description": "Gerald is very particular to eight point sets. He thinks that any decent eight point set must consist of all pairwise intersections of three distinct integer vertical straight lines and three distinct integer horizontal straight lines, except for the average of these nine points. In other words, there must be three integers x1,\u2009x2,\u2009x3 and three more integers y1,\u2009y2,\u2009y3, such that x1\u2009<\u2009x2\u2009<\u2009x3, y1\u2009<\u2009y2\u2009<\u2009y3 and the eight point set consists of all points (xi,\u2009yj) (1\u2009\u2264\u2009i,\u2009j\u2009\u2264\u20093), except for point (x2,\u2009y2).You have a set of eight points. Find out if Gerald can use this set?", "input_spec": "The input consists of eight lines, the i-th line contains two space-separated integers xi and yi (0\u2009\u2264\u2009xi,\u2009yi\u2009\u2264\u2009106). You do not have any other conditions for these points.", "output_spec": "In a single line print word \"respectable\", if the given set of points corresponds to Gerald's decency rules, and \"ugly\" otherwise.", "sample_inputs": ["0 0\n0 1\n0 2\n1 0\n1 2\n2 0\n2 1\n2 2", "0 0\n1 0\n2 0\n3 0\n4 0\n5 0\n6 0\n7 0", "1 1\n1 2\n1 3\n2 1\n2 2\n2 3\n3 1\n3 2"], "sample_outputs": ["respectable", "ugly", "ugly"], "notes": null}, "src_uid": "f3c96123334534056f26b96f90886807"}
{"nl": {"description": "The only difference between easy and hard versions is constraints.The BerTV channel every day broadcasts one episode of one of the $$$k$$$ TV shows. You know the schedule for the next $$$n$$$ days: a sequence of integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le k$$$), where $$$a_i$$$ is the show, the episode of which will be shown in $$$i$$$-th day.The subscription to the show is bought for the entire show (i.e. for all its episodes), for each show the subscription is bought separately.How many minimum subscriptions do you need to buy in order to have the opportunity to watch episodes of purchased shows $$$d$$$ ($$$1 \\le d \\le n$$$) days in a row? In other words, you want to buy the minimum number of TV shows so that there is some segment of $$$d$$$ consecutive days in which all episodes belong to the purchased shows.", "input_spec": "The first line contains an integer $$$t$$$ ($$$1 \\le t \\le 100$$$) \u2014 the number of test cases in the input. Then $$$t$$$ test case descriptions follow. The first line of each test case contains three integers $$$n, k$$$ and $$$d$$$ ($$$1 \\le n \\le 100$$$, $$$1 \\le k \\le 100$$$, $$$1 \\le d \\le n$$$). The second line contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le k$$$), where $$$a_i$$$ is the show that is broadcasted on the $$$i$$$-th day. It is guaranteed that the sum of the values \u200b\u200bof $$$n$$$ for all test cases in the input does not exceed $$$100$$$.", "output_spec": "Print $$$t$$$ integers \u2014 the answers to the test cases in the input in the order they follow. The answer to a test case is the minimum number of TV shows for which you need to purchase a subscription so that you can watch episodes of the purchased TV shows on BerTV for $$$d$$$ consecutive days. Please note that it is permissible that you will be able to watch more than $$$d$$$ days in a row.", "sample_inputs": ["4\n5 2 2\n1 2 1 2 1\n9 3 3\n3 3 3 2 2 2 1 1 1\n4 10 4\n10 8 6 4\n16 9 8\n3 1 4 1 5 9 2 6 5 3 5 8 9 7 9 3"], "sample_outputs": ["2\n1\n4\n5"], "notes": "NoteIn the first test case to have an opportunity to watch shows for two consecutive days, you need to buy a subscription on show $$$1$$$ and on show $$$2$$$. So the answer is two.In the second test case, you can buy a subscription to any show because for each show you can find a segment of three consecutive days, consisting only of episodes of this show.In the third test case in the unique segment of four days, you have four different shows, so you need to buy a subscription to all these four shows.In the fourth test case, you can buy subscriptions to shows $$$3,5,7,8,9$$$, and you will be able to watch shows for the last eight days."}, "src_uid": "56da4ec7cd849c4330d188d8c9bd6094"}
{"nl": {"description": "A and B are preparing themselves for programming contests.To train their logical thinking and solve problems better, A and B decided to play chess. During the game A wondered whose position is now stronger.For each chess piece we know its weight:   the queen's weight is 9,  the rook's weight is 5,  the bishop's weight is 3,  the knight's weight is 3,  the pawn's weight is 1,  the king's weight isn't considered in evaluating position. The player's weight equals to the sum of weights of all his pieces on the board.As A doesn't like counting, he asked you to help him determine which player has the larger position weight.", "input_spec": "The input contains eight lines, eight characters each \u2014 the board's description. The white pieces on the board are marked with uppercase letters, the black pieces are marked with lowercase letters. The white pieces are denoted as follows: the queen is represented is 'Q', the rook \u2014 as 'R', the bishop \u2014 as'B', the knight \u2014 as 'N', the pawn \u2014 as 'P', the king \u2014 as 'K'. The black pieces are denoted as 'q', 'r', 'b', 'n', 'p', 'k', respectively. An empty square of the board is marked as '.' (a dot).  It is not guaranteed that the given chess position can be achieved in a real game. Specifically, there can be an arbitrary (possibly zero) number pieces of each type, the king may be under attack and so on.", "output_spec": "Print \"White\" (without quotes) if the weight of the position of the white pieces is more than the weight of the position of the black pieces, print \"Black\" if the weight of the black pieces is more than the weight of the white pieces and print \"Draw\" if the weights of the white and black pieces are equal.", "sample_inputs": ["...QK...\n........\n........\n........\n........\n........\n........\n...rk...", "rnbqkbnr\npppppppp\n........\n........\n........\n........\nPPPPPPPP\nRNBQKBNR", "rppppppr\n...k....\n........\n........\n........\n........\nK...Q...\n........"], "sample_outputs": ["White", "Draw", "Black"], "notes": "NoteIn the first test sample the weight of the position of the white pieces equals to 9, the weight of the position of the black pieces equals 5.In the second test sample the weights of the positions of the black and the white pieces are equal to 39.In the third test sample the weight of the position of the white pieces equals to 9, the weight of the position of the black pieces equals to 16."}, "src_uid": "44bed0ca7a8fb42fb72c1584d39a4442"}
{"nl": {"description": "There are $$$n$$$ computers in a row, all originally off, and Phoenix wants to turn all of them on. He will manually turn on computers one at a time. At any point, if computer $$$i-1$$$ and computer $$$i+1$$$ are both on, computer $$$i$$$ $$$(2 \\le i \\le n-1)$$$ will turn on automatically if it is not already on. Note that Phoenix cannot manually turn on a computer that already turned on automatically.If we only consider the sequence of computers that Phoenix turns on manually, how many ways can he turn on all the computers? Two sequences are distinct if either the set of computers turned on manually is distinct, or the order of computers turned on manually is distinct. Since this number may be large, please print it modulo $$$M$$$.", "input_spec": "The first line contains two integers $$$n$$$ and $$$M$$$ ($$$3 \\le n \\le 400$$$; $$$10^8 \\le M \\le 10^9$$$)\u00a0\u2014 the number of computers and the modulo. It is guaranteed that $$$M$$$ is prime.", "output_spec": "Print one integer\u00a0\u2014 the number of ways to turn on the computers modulo $$$M$$$.", "sample_inputs": ["3 100000007", "4 100000007", "400 234567899"], "sample_outputs": ["6", "20", "20914007"], "notes": "NoteIn the first example, these are the $$$6$$$ orders in which Phoenix can turn on all computers:   $$$[1,3]$$$. Turn on computer $$$1$$$, then $$$3$$$. Note that computer $$$2$$$ turns on automatically after computer $$$3$$$ is turned on manually, but we only consider the sequence of computers that are turned on manually.  $$$[3,1]$$$. Turn on computer $$$3$$$, then $$$1$$$.  $$$[1,2,3]$$$. Turn on computer $$$1$$$, $$$2$$$, then $$$3$$$.  $$$[2,1,3]$$$  $$$[2,3,1]$$$  $$$[3,2,1]$$$ "}, "src_uid": "4f0e0d1deef0761a46b64de3eb98e774"}
{"nl": {"description": "The girl Taylor has a beautiful calendar for the year y. In the calendar all days are given with their days of week: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.The calendar is so beautiful that she wants to know what is the next year after y when the calendar will be exactly the same. Help Taylor to find that year.Note that leap years has 366 days. The year is leap if it is divisible by 400 or it is divisible by 4, but not by 100 (https://en.wikipedia.org/wiki/Leap_year).", "input_spec": "The only line contains integer y (1000\u2009\u2264\u2009y\u2009<\u2009100'000) \u2014 the year of the calendar.", "output_spec": "Print the only integer y' \u2014 the next year after y when the calendar will be the same. Note that you should find the first year after y with the same calendar.", "sample_inputs": ["2016", "2000", "50501"], "sample_outputs": ["2044", "2028", "50507"], "notes": "NoteToday is Monday, the 13th of June, 2016."}, "src_uid": "565bbd09f79eb7bfe2f2da46647af0f2"}
{"nl": {"description": "Two best friends Serozha and Gena play a game.Initially there is one pile consisting of n stones on the table. During one move one pile should be taken and divided into an arbitrary number of piles consisting of a1\u2009>\u2009a2\u2009>\u2009...\u2009>\u2009ak\u2009>\u20090 stones. The piles should meet the condition a1\u2009-\u2009a2\u2009=\u2009a2\u2009-\u2009a3\u2009=\u2009...\u2009=\u2009ak\u2009-\u20091\u2009-\u2009ak\u2009=\u20091. Naturally, the number of piles k should be no less than two.The friends play in turns. The player who cannot make a move loses. Serozha makes the first move. Who will win if both players play in the optimal way?", "input_spec": "The single line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009105).", "output_spec": "If Serozha wins, print k, which represents the minimal number of piles into which he can split the initial one during the first move in order to win the game. If Gena wins, print \"-1\" (without the quotes).", "sample_inputs": ["3", "6", "100"], "sample_outputs": ["2", "-1", "8"], "notes": null}, "src_uid": "63262317ba572d78163c91b853c05506"}
{"nl": {"description": "  You can preview the image in better quality by the link: http://assets.codeforces.com/files/656/without-text.png", "input_spec": "The only line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be an alphanumeric character or a full stop \".\".", "output_spec": "Output the required answer.", "sample_inputs": ["Codeforces", "APRIL.1st"], "sample_outputs": ["-87", "17"], "notes": null}, "src_uid": "d3fa5a3a008048dc4a9fbce1ebc61d67"}
{"nl": {"description": "Let's denote a function $$$f(x)$$$ in such a way: we add $$$1$$$ to $$$x$$$, then, while there is at least one trailing zero in the resulting number, we remove that zero. For example,   $$$f(599) = 6$$$: $$$599 + 1 = 600 \\rightarrow 60 \\rightarrow 6$$$;  $$$f(7) = 8$$$: $$$7 + 1 = 8$$$;  $$$f(9) = 1$$$: $$$9 + 1 = 10 \\rightarrow 1$$$;  $$$f(10099) = 101$$$: $$$10099 + 1 = 10100 \\rightarrow 1010 \\rightarrow 101$$$. We say that some number $$$y$$$ is reachable from $$$x$$$ if we can apply function $$$f$$$ to $$$x$$$ some (possibly zero) times so that we get $$$y$$$ as a result. For example, $$$102$$$ is reachable from $$$10098$$$ because $$$f(f(f(10098))) = f(f(10099)) = f(101) = 102$$$; and any number is reachable from itself.You are given a number $$$n$$$; your task is to count how many different numbers are reachable from $$$n$$$.", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\le n \\le 10^9$$$).", "output_spec": "Print one integer: the number of different numbers that are reachable from $$$n$$$.", "sample_inputs": ["1098", "10"], "sample_outputs": ["20", "19"], "notes": "NoteThe numbers that are reachable from $$$1098$$$ are:$$$1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1098, 1099$$$."}, "src_uid": "055fbbde4b9ffd4473e6e716da6da899"}
{"nl": {"description": "You may have heard of the pie rule before. It states that if two people wish to fairly share a slice of pie, one person should cut the slice in half, and the other person should choose who gets which slice. Alice and Bob have many slices of pie, and rather than cutting the slices in half, each individual slice will be eaten by just one person.The way Alice and Bob decide who eats each slice is as follows. First, the order in which the pies are to be handed out is decided. There is a special token called the \"decider\" token, initially held by Bob. Until all the pie is handed out, whoever has the decider token will give the next slice of pie to one of the participants, and the decider token to the other participant. They continue until no slices of pie are left.All of the slices are of excellent quality, so each participant obviously wants to maximize the total amount of pie they get to eat. Assuming both players make their decisions optimally, how much pie will each participant receive?", "input_spec": "Input will begin with an integer N (1\u2009\u2264\u2009N\u2009\u2264\u200950), the number of slices of pie.  Following this is a line with N integers indicating the sizes of the slices (each between 1 and 100000, inclusive), in the order in which they must be handed out.", "output_spec": "Print two integers. First, the sum of the sizes of slices eaten by Alice, then the sum of the sizes of the slices eaten by Bob, assuming both players make their decisions optimally.", "sample_inputs": ["3\n141 592 653", "5\n10 21 10 21 10"], "sample_outputs": ["653 733", "31 41"], "notes": "NoteIn the first example, Bob takes the size 141 slice for himself and gives the decider token to Alice. Then Alice gives the size 592 slice to Bob and keeps the decider token for herself, so that she can then give the size 653 slice to herself."}, "src_uid": "414540223db9d4cfcec6a973179a0216"}
{"nl": {"description": "There is a legend in the IT City college. A student that failed to answer all questions on the game theory exam is given one more chance by his professor. The student has to play a game with the professor.The game is played on a square field consisting of n\u2009\u00d7\u2009n cells. Initially all cells are empty. On each turn a player chooses and paint an empty cell that has no common sides with previously painted cells. Adjacent corner of painted cells is allowed. On the next turn another player does the same, then the first one and so on. The player with no cells to paint on his turn loses.The professor have chosen the field size n and allowed the student to choose to be the first or the second player in the game. What should the student choose to win the game? Both players play optimally.", "input_spec": "The only line of the input contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091018) \u2014 the size of the field.", "output_spec": "Output number 1, if the player making the first turn wins when both players play optimally, otherwise print number 2.", "sample_inputs": ["1", "2"], "sample_outputs": ["1", "2"], "notes": null}, "src_uid": "816ec4cd9736f3113333ef05405b8e81"}
{"nl": {"description": "The bear decided to store some raspberry for the winter. He cunningly found out the price for a barrel of honey in kilos of raspberry for each of the following n days. According to the bear's data, on the i-th (1\u2009\u2264\u2009i\u2009\u2264\u2009n) day, the price for one barrel of honey is going to is xi kilos of raspberry.Unfortunately, the bear has neither a honey barrel, nor the raspberry. At the same time, the bear's got a friend who is ready to lend him a barrel of honey for exactly one day for c kilograms of raspberry. That's why the bear came up with a smart plan. He wants to choose some day d (1\u2009\u2264\u2009d\u2009<\u2009n), lent a barrel of honey and immediately (on day d) sell it according to a daily exchange rate. The next day (d\u2009+\u20091) the bear wants to buy a new barrel of honey according to a daily exchange rate (as he's got some raspberry left from selling the previous barrel) and immediately (on day d\u2009+\u20091) give his friend the borrowed barrel of honey as well as c kilograms of raspberry for renting the barrel.The bear wants to execute his plan at most once and then hibernate. What maximum number of kilograms of raspberry can he earn? Note that if at some point of the plan the bear runs out of the raspberry, then he won't execute such a plan.", "input_spec": "The first line contains two space-separated integers, n and c (2\u2009\u2264\u2009n\u2009\u2264\u2009100,\u20090\u2009\u2264\u2009c\u2009\u2264\u2009100), \u2014 the number of days and the number of kilos of raspberry that the bear should give for borrowing the barrel. The second line contains n space-separated integers x1,\u2009x2,\u2009...,\u2009xn (0\u2009\u2264\u2009xi\u2009\u2264\u2009100), the price of a honey barrel on day i.", "output_spec": "Print a single integer \u2014 the answer to the problem.", "sample_inputs": ["5 1\n5 10 7 3 20", "6 2\n100 1 10 40 10 40", "3 0\n1 2 3"], "sample_outputs": ["3", "97", "0"], "notes": "NoteIn the first sample the bear will lend a honey barrel at day 3 and then sell it for 7. Then the bear will buy a barrel for 3 and return it to the friend. So, the profit is (7 - 3 - 1) = 3.In the second sample bear will lend a honey barrel at day 1 and then sell it for 100. Then the bear buy the barrel for 1 at the day 2. So, the profit is (100 - 1 - 2) = 97."}, "src_uid": "411539a86f2e94eb6386bb65c9eb9557"}
{"nl": {"description": "For an array of integers $$$a$$$, let's define $$$|a|$$$ as the number of elements in it.Let's denote two functions: $$$F(a, k)$$$ is a function that takes an array of integers $$$a$$$ and a positive integer $$$k$$$. The result of this function is the array containing $$$|a|$$$ first elements of the array that you get by replacing each element of $$$a$$$ with exactly $$$k$$$ copies of that element.For example, $$$F([2, 2, 1, 3, 5, 6, 8], 2)$$$ is calculated as follows: first, you replace each element of the array with $$$2$$$ copies of it, so you obtain $$$[2, 2, 2, 2, 1, 1, 3, 3, 5, 5, 6, 6, 8, 8]$$$. Then, you take the first $$$7$$$ elements of the array you obtained, so the result of the function is $$$[2, 2, 2, 2, 1, 1, 3]$$$. $$$G(a, x, y)$$$ is a function that takes an array of integers $$$a$$$ and two different integers $$$x$$$ and $$$y$$$. The result of this function is the array $$$a$$$ with every element equal to $$$x$$$ replaced by $$$y$$$, and every element equal to $$$y$$$ replaced by $$$x$$$.For example, $$$G([1, 1, 2, 3, 5], 3, 1) = [3, 3, 2, 1, 5]$$$.An array $$$a$$$ is a parent of the array $$$b$$$ if:  either there exists a positive integer $$$k$$$ such that $$$F(a, k) = b$$$;  or there exist two different integers $$$x$$$ and $$$y$$$ such that $$$G(a, x, y) = b$$$. An array $$$a$$$ is an ancestor of the array $$$b$$$ if there exists a finite sequence of arrays $$$c_0, c_1, \\dots, c_m$$$ ($$$m \\ge 0$$$) such that $$$c_0$$$ is $$$a$$$, $$$c_m$$$ is $$$b$$$, and for every $$$i \\in [1, m]$$$, $$$c_{i-1}$$$ is a parent of $$$c_i$$$.And now, the problem itself.You are given two integers $$$n$$$ and $$$k$$$. Your goal is to construct a sequence of arrays $$$s_1, s_2, \\dots, s_m$$$ in such a way that:  every array $$$s_i$$$ contains exactly $$$n$$$ elements, and all elements are integers from $$$1$$$ to $$$k$$$;  for every array $$$a$$$ consisting of exactly $$$n$$$ integers from $$$1$$$ to $$$k$$$, the sequence contains at least one array $$$s_i$$$ such that $$$s_i$$$ is an ancestor of $$$a$$$. Print the minimum number of arrays in such sequence.", "input_spec": "The only line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n, k \\le 2 \\cdot 10^5$$$).", "output_spec": "Print one integer \u2014 the minimum number of elements in a sequence of arrays meeting the constraints. Since the answer can be large, output it modulo $$$998244353$$$.", "sample_inputs": ["3 2", "4 10", "13 37", "1337 42", "198756 123456", "123456 198756"], "sample_outputs": ["2", "12", "27643508", "211887828", "159489391", "460526614"], "notes": "NoteLet's analyze the first example.One of the possible answers for the first example is the sequence $$$[[2, 1, 2], [1, 2, 2]]$$$. Every array of size $$$3$$$ consisting of elements from $$$1$$$ to $$$2$$$ has an ancestor in this sequence:  for the array $$$[1, 1, 1]$$$, the ancestor is $$$[1, 2, 2]$$$: $$$F([1, 2, 2], 13) = [1, 1, 1]$$$;  for the array $$$[1, 1, 2]$$$, the ancestor is $$$[1, 2, 2]$$$: $$$F([1, 2, 2], 2) = [1, 1, 2]$$$;  for the array $$$[1, 2, 1]$$$, the ancestor is $$$[2, 1, 2]$$$: $$$G([2, 1, 2], 1, 2) = [1, 2, 1]$$$;  for the array $$$[1, 2, 2]$$$, the ancestor is $$$[1, 2, 2]$$$;  for the array $$$[2, 1, 1]$$$, the ancestor is $$$[1, 2, 2]$$$: $$$G([1, 2, 2], 1, 2) = [2, 1, 1]$$$;  for the array $$$[2, 1, 2]$$$, the ancestor is $$$[2, 1, 2]$$$;  for the array $$$[2, 2, 1]$$$, the ancestor is $$$[2, 1, 2]$$$: $$$F([2, 1, 2], 2) = [2, 2, 1]$$$;  for the array $$$[2, 2, 2]$$$, the ancestor is $$$[1, 2, 2]$$$: $$$G(F([1, 2, 2], 4), 1, 2) = G([1, 1, 1], 1, 2) = [2, 2, 2]$$$. "}, "src_uid": "eb9d24070cc5b347d020189d803628ae"}
{"nl": {"description": "All bus tickets in Berland have their numbers. A number consists of $$$n$$$ digits ($$$n$$$ is even). Only $$$k$$$ decimal digits $$$d_1, d_2, \\dots, d_k$$$ can be used to form ticket numbers. If $$$0$$$ is among these digits, then numbers may have leading zeroes. For example, if $$$n = 4$$$ and only digits $$$0$$$ and $$$4$$$ can be used, then $$$0000$$$, $$$4004$$$, $$$4440$$$ are valid ticket numbers, and $$$0002$$$, $$$00$$$, $$$44443$$$ are not.A ticket is lucky if the sum of first $$$n / 2$$$ digits is equal to the sum of remaining $$$n / 2$$$ digits. Calculate the number of different lucky tickets in Berland. Since the answer may be big, print it modulo $$$998244353$$$.", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ $$$(2 \\le n \\le 2 \\cdot 10^5, 1 \\le k \\le 10)$$$ \u2014 the number of digits in each ticket number, and the number of different decimal digits that may be used. $$$n$$$ is even. The second line contains a sequence of pairwise distinct integers $$$d_1, d_2, \\dots, d_k$$$ $$$(0 \\le d_i \\le 9)$$$ \u2014 the digits that may be used in ticket numbers. The digits are given in arbitrary order.", "output_spec": "Print the number of lucky ticket numbers, taken modulo $$$998244353$$$.", "sample_inputs": ["4 2\n1 8", "20 1\n6", "10 5\n6 1 4 0 3", "1000 7\n5 4 0 1 8 3 2"], "sample_outputs": ["6", "1", "569725", "460571165"], "notes": "NoteIn the first example there are $$$6$$$ lucky ticket numbers: $$$1111$$$, $$$1818$$$, $$$1881$$$, $$$8118$$$, $$$8181$$$ and $$$8888$$$.There is only one ticket number in the second example, it consists of $$$20$$$ digits $$$6$$$. This ticket number is lucky, so the answer is $$$1$$$."}, "src_uid": "279f1f7d250a4be6406c6c7bfc818bbf"}
{"nl": {"description": "Statistics claims that students sleep no more than three hours a day. But even in the world of their dreams, while they are snoring peacefully, the sense of impending doom is still upon them.A poor student is dreaming that he is sitting the mathematical analysis exam. And he is examined by the most formidable professor of all times, a three times Soviet Union Hero, a Noble Prize laureate in student expulsion, venerable Petr Palych.The poor student couldn't answer a single question. Thus, instead of a large spacious office he is going to apply for a job to thorium mines. But wait a minute! Petr Palych decided to give the student the last chance! Yes, that is possible only in dreams. So the professor began: \"Once a Venusian girl and a Marsian boy met on the Earth and decided to take a walk holding hands. But the problem is the girl has al fingers on her left hand and ar fingers on the right one. The boy correspondingly has bl and br fingers. They can only feel comfortable when holding hands, when no pair of the girl's fingers will touch each other. That is, they are comfortable when between any two girl's fingers there is a boy's finger. And in addition, no three fingers of the boy should touch each other. Determine if they can hold hands so that the both were comfortable.\"The boy any the girl don't care who goes to the left and who goes to the right. The difference is only that if the boy goes to the left of the girl, he will take her left hand with his right one, and if he goes to the right of the girl, then it is vice versa.", "input_spec": "The first line contains two positive integers not exceeding 100. They are the number of fingers on the Venusian girl's left and right hand correspondingly. The second line contains two integers not exceeding 100. They are the number of fingers on the Marsian boy's left and right hands correspondingly.", "output_spec": "Print YES or NO, that is, the answer to Petr Palych's question.", "sample_inputs": ["5 1\n10 5", "4 5\n3 3", "1 2\n11 6"], "sample_outputs": ["YES", "YES", "NO"], "notes": "NoteThe boy and the girl don't really care who goes to the left."}, "src_uid": "36b7478e162be6e985613b2dad0974dd"}
{"nl": {"description": "Nastya received a gift on New Year\u00a0\u2014 a magic wardrobe. It is magic because in the end of each month the number of dresses in it doubles (i.e. the number of dresses becomes twice as large as it is in the beginning of the month).Unfortunately, right after the doubling the wardrobe eats one of the dresses (if any) with the 50% probability. It happens every month except the last one in the year. Nastya owns x dresses now, so she became interested in the expected number of dresses she will have in one year. Nastya lives in Byteland, so the year lasts for k\u2009+\u20091 months.Nastya is really busy, so she wants you to solve this problem. You are the programmer, after all. Also, you should find the answer modulo 109\u2009+\u20097, because it is easy to see that it is always integer.", "input_spec": "The only line contains two integers x and k (0\u2009\u2264\u2009x,\u2009k\u2009\u2264\u20091018), where x is the initial number of dresses and k\u2009+\u20091 is the number of months in a year in Byteland.", "output_spec": "In the only line print a single integer\u00a0\u2014 the expected number of dresses Nastya will own one year later modulo 109\u2009+\u20097.", "sample_inputs": ["2 0", "2 1", "3 2"], "sample_outputs": ["4", "7", "21"], "notes": "NoteIn the first example a year consists on only one month, so the wardrobe does not eat dresses at all.In the second example after the first month there are 3 dresses with 50% probability and 4 dresses with 50% probability. Thus, in the end of the year there are 6 dresses with 50% probability and 8 dresses with 50% probability. This way the answer for this test is (6\u2009+\u20098)\u2009/\u20092\u2009=\u20097."}, "src_uid": "e0e017e8c8872fc1957242ace739464d"}
{"nl": {"description": "Let's call a string good if and only if it consists of only two types of letters\u00a0\u2014 'a' and 'b' and every two consecutive letters are distinct. For example \"baba\" and \"aba\" are good strings and \"abb\" is a bad string.You have $$$a$$$ strings \"a\", $$$b$$$ strings \"b\" and $$$c$$$ strings \"ab\". You want to choose some subset of these strings and concatenate them in any arbitrarily order.What is the length of the longest good string you can obtain this way?", "input_spec": "The first line contains three positive integers $$$a$$$, $$$b$$$, $$$c$$$ ($$$1 \\leq a, b, c \\leq 10^9$$$)\u00a0\u2014 the number of strings \"a\", \"b\" and \"ab\" respectively.", "output_spec": "Print a single number\u00a0\u2014 the maximum possible length of the good string you can obtain.", "sample_inputs": ["1 1 1", "2 1 2", "3 5 2", "2 2 1", "1000000000 1000000000 1000000000"], "sample_outputs": ["4", "7", "11", "6", "4000000000"], "notes": "NoteIn the first example the optimal string is \"baba\".In the second example the optimal string is \"abababa\".In the third example the optimal string is \"bababababab\".In the fourth example the optimal string is \"ababab\"."}, "src_uid": "609f131325c13213aedcf8d55fc3ed77"}
{"nl": {"description": "Limak is a little polar bear. Polar bears hate long strings and thus they like to compress them. You should also know that Limak is so young that he knows only first six letters of the English alphabet: 'a', 'b', 'c', 'd', 'e' and 'f'.You are given a set of q possible operations. Limak can perform them in any order, any operation may be applied any number of times. The i-th operation is described by a string ai of length two and a string bi of length one. No two of q possible operations have the same string ai.When Limak has a string s he can perform the i-th operation on s if the first two letters of s match a two-letter string ai. Performing the i-th operation removes first two letters of s and inserts there a string bi. See the notes section for further clarification.You may note that performing an operation decreases the length of a string s exactly by 1. Also, for some sets of operations there may be a string that cannot be compressed any further, because the first two letters don't match any ai.Limak wants to start with a string of length n and perform n\u2009-\u20091 operations to finally get a one-letter string \"a\". In how many ways can he choose the starting string to be able to get \"a\"? Remember that Limak can use only letters he knows.", "input_spec": "The first line contains two integers n and q (2\u2009\u2264\u2009n\u2009\u2264\u20096, 1\u2009\u2264\u2009q\u2009\u2264\u200936)\u00a0\u2014 the length of the initial string and the number of available operations. The next q lines describe the possible operations. The i-th of them contains two strings ai and bi (|ai|\u2009=\u20092,\u2009|bi|\u2009=\u20091). It's guaranteed that ai\u2009\u2260\u2009aj for i\u2009\u2260\u2009j and that all ai and bi consist of only first six lowercase English letters.", "output_spec": "Print the number of strings of length n that Limak will be able to transform to string \"a\" by applying only operations given in the input.", "sample_inputs": ["3 5\nab a\ncc c\nca a\nee c\nff d", "2 8\naf e\ndc d\ncc f\nbc b\nda b\neb a\nbb b\nff c", "6 2\nbb a\nba a"], "sample_outputs": ["4", "1", "0"], "notes": "NoteIn the first sample, we count initial strings of length 3 from which Limak can get a required string \"a\". There are 4 such strings: \"abb\", \"cab\", \"cca\", \"eea\". The first one Limak can compress using operation 1 two times (changing \"ab\" to a single \"a\"). The first operation would change \"abb\" to \"ab\" and the second operation would change \"ab\" to \"a\".Other three strings may be compressed as follows:   \"cab\"  \"ab\"  \"a\"  \"cca\"  \"ca\"  \"a\"  \"eea\"  \"ca\"  \"a\" In the second sample, the only correct initial string is \"eb\" because it can be immediately compressed to \"a\"."}, "src_uid": "c42abec29bfd17de3f43385fa6bea534"}
{"nl": {"description": "Absent-minded Masha got set of n cubes for her birthday.At each of 6 faces of each cube, there is exactly one digit from 0 to 9. Masha became interested what is the largest natural x such she can make using her new cubes all integers from 1 to x.To make a number Masha can rotate her cubes and put them in a row. After that, she looks at upper faces of cubes from left to right and reads the number.The number can't contain leading zeros. It's not required to use all cubes to build a number.Pay attention: Masha can't make digit 6 from digit 9 and vice-versa using cube rotations.", "input_spec": "In first line integer n is given (1\u2009\u2264\u2009n\u2009\u2264\u20093)\u00a0\u2014 the number of cubes, Masha got for her birthday. Each of next n lines contains 6 integers aij (0\u2009\u2264\u2009aij\u2009\u2264\u20099)\u00a0\u2014 number on j-th face of i-th cube.", "output_spec": "Print single integer\u00a0\u2014 maximum number x such Masha can make any integers from 1 to x using her cubes or 0 if Masha can't make even 1.", "sample_inputs": ["3\n0 1 2 3 4 5\n6 7 8 9 0 1\n2 3 4 5 6 7", "3\n0 1 3 5 6 8\n1 2 4 5 7 8\n2 3 4 6 7 9"], "sample_outputs": ["87", "98"], "notes": "NoteIn the first test case, Masha can build all numbers from 1 to 87, but she can't make 88 because there are no two cubes with digit 8."}, "src_uid": "20aa53bffdfd47b4e853091ee6b11a4b"}
{"nl": {"description": "One day Vasya heard a story: \"In the city of High Bertown a bus number 62 left from the bus station. It had n grown-ups and m kids...\"The latter events happen to be of no importance to us. Vasya is an accountant and he loves counting money. So he wondered what maximum and minimum sum of money these passengers could have paid for the ride.The bus fare equals one berland ruble in High Bertown. However, not everything is that easy \u2014 no more than one child can ride for free with each grown-up passenger. That means that a grown-up passenger who rides with his k (k\u2009>\u20090) children, pays overall k rubles: a ticket for himself and (k\u2009-\u20091) tickets for his children. Also, a grown-up can ride without children, in this case he only pays one ruble.We know that in High Bertown children can't ride in a bus unaccompanied by grown-ups.Help Vasya count the minimum and the maximum sum in Berland rubles, that all passengers of this bus could have paid in total.", "input_spec": "The input file consists of a single line containing two space-separated numbers n and m (0\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009105) \u2014 the number of the grown-ups and the number of the children in the bus, correspondingly.", "output_spec": "If n grown-ups and m children could have ridden in the bus, then print on a single line two space-separated integers \u2014 the minimum and the maximum possible total bus fare, correspondingly.  Otherwise, print \"Impossible\" (without the quotes).", "sample_inputs": ["1 2", "0 5", "2 2"], "sample_outputs": ["2 2", "Impossible", "2 3"], "notes": "NoteIn the first sample a grown-up rides with two children and pays two rubles.In the second sample there are only children in the bus, so the situation is impossible. In the third sample there are two cases:  Each of the two grown-ups rides with one children and pays one ruble for the tickets. In this case the passengers pay two rubles in total.  One of the grown-ups ride with two children's and pays two rubles, the another one rides alone and pays one ruble for himself. So, they pay three rubles in total. "}, "src_uid": "1e865eda33afe09302bda9077d613763"}
{"nl": {"description": "There is a beautiful garden of stones in Innopolis.Its most beautiful place is the $$$n$$$ piles with stones numbered from $$$1$$$ to $$$n$$$.EJOI participants have visited this place twice. When they first visited it, the number of stones in piles was $$$x_1, x_2, \\ldots, x_n$$$, correspondingly. One of the participants wrote down this sequence in a notebook. They visited it again the following day, and the number of stones in piles was equal to $$$y_1, y_2, \\ldots, y_n$$$. One of the participants also wrote it down in a notebook.It is well known that every member of the EJOI jury during the night either sits in the room $$$108$$$ or comes to the place with stones. Each jury member who comes there either takes one stone for himself or moves one stone from one pile to another. We can assume that there is an unlimited number of jury members. No one except the jury goes to the place with stones at night.Participants want to know whether their notes can be correct or they are sure to have made a mistake.", "input_spec": "The first line of the input file contains a single integer $$$n$$$, the number of piles with stones in the garden ($$$1 \\leq n \\leq 50$$$). The second line contains $$$n$$$ integers separated by spaces $$$x_1, x_2, \\ldots, x_n$$$, the number of stones in piles recorded in the notebook when the participants came to the place with stones for the first time ($$$0 \\leq x_i \\leq 1000$$$). The third line contains $$$n$$$ integers separated by spaces $$$y_1, y_2, \\ldots, y_n$$$, the number of stones in piles recorded in the notebook when the participants came to the place with stones for the second time ($$$0 \\leq y_i \\leq 1000$$$).", "output_spec": "If the records can be consistent output \"Yes\", otherwise output \"No\" (quotes for clarity).", "sample_inputs": ["5\n1 2 3 4 5\n2 1 4 3 5", "5\n1 1 1 1 1\n1 0 1 0 1", "3\n2 3 9\n1 7 9"], "sample_outputs": ["Yes", "Yes", "No"], "notes": "NoteIn the first example, the following could have happened during the night: one of the jury members moved one stone from the second pile to the first pile, and the other jury member moved one stone from the fourth pile to the third pile.In the second example, the jury took stones from the second and fourth piles.It can be proved that it is impossible for the jury members to move and took stones to convert the first array into the second array."}, "src_uid": "e0ddac5c6d3671070860dda10d50c28a"}
{"nl": {"description": "Imagine a city with n horizontal streets crossing m vertical streets, forming an (n\u2009-\u20091)\u2009\u00d7\u2009(m\u2009-\u20091) grid. In order to increase the traffic flow, mayor of the city has decided to make each street one way. This means in each horizontal street, the traffic moves only from west to east or only from east to west. Also, traffic moves only from north to south or only from south to north in each vertical street. It is possible to enter a horizontal street from a vertical street, or vice versa, at their intersection.  The mayor has received some street direction patterns. Your task is to check whether it is possible to reach any junction from any other junction in the proposed street direction pattern.", "input_spec": "The first line of input contains two integers n and m, (2\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200920), denoting the number of horizontal streets and the number of vertical streets. The second line contains a string of length n, made of characters '<' and '>', denoting direction of each horizontal street. If the i-th character is equal to '<', the street is directed from east to west otherwise, the street is directed from west to east. Streets are listed in order from north to south. The third line contains a string of length m, made of characters '^' and 'v', denoting direction of each vertical street. If the i-th character is equal to '^', the street is directed from south to north, otherwise the street is directed from north to south. Streets are listed in order from west to east.", "output_spec": "If the given pattern meets the mayor's criteria, print a single line containing \"YES\", otherwise print a single line containing \"NO\".", "sample_inputs": ["3 3\n><>\nv^v", "4 6\n<><>\nv^v^v^"], "sample_outputs": ["NO", "YES"], "notes": "NoteThe figure above shows street directions in the second sample test case."}, "src_uid": "eab5c84c9658eb32f5614cd2497541cf"}
{"nl": {"description": "Vector Willman and Array Bolt are the two most famous athletes of Byteforces. They are going to compete in a race with a distance of L meters today.  Willman and Bolt have exactly the same speed, so when they compete the result is always a tie. That is a problem for the organizers because they want a winner. While watching previous races the organizers have noticed that Willman can perform only steps of length equal to w meters, and Bolt can perform only steps of length equal to b meters. Organizers decided to slightly change the rules of the race. Now, at the end of the racetrack there will be an abyss, and the winner will be declared the athlete, who manages to run farther from the starting point of the the racetrack (which is not the subject to change by any of the athletes). Note that none of the athletes can run infinitely far, as they both will at some moment of time face the point, such that only one step further will cause them to fall in the abyss. In other words, the athlete will not fall into the abyss if the total length of all his steps will be less or equal to the chosen distance L.Since the organizers are very fair, the are going to set the length of the racetrack as an integer chosen randomly and uniformly in range from 1 to t (both are included). What is the probability that Willman and Bolt tie again today?", "input_spec": "The first line of the input contains three integers t, w and b (1\u2009\u2264\u2009t,\u2009w,\u2009b\u2009\u2264\u20095\u00b71018) \u2014 the maximum possible length of the racetrack, the length of Willman's steps and the length of Bolt's steps respectively.", "output_spec": "Print the answer to the problem as an irreducible fraction . Follow the format of the samples output. The fraction  (p and q are integers, and both p\u2009\u2265\u20090 and q\u2009>\u20090 holds) is called irreducible, if there is no such integer d\u2009>\u20091, that both p and q are divisible by d.", "sample_inputs": ["10 3 2", "7 1 2"], "sample_outputs": ["3/10", "3/7"], "notes": "NoteIn the first sample Willman and Bolt will tie in case 1, 6 or 7 are chosen as the length of the racetrack."}, "src_uid": "7a1d8ca25bce0073c4eb5297b94501b5"}
{"nl": {"description": "You are given an integer sequence $$$1, 2, \\dots, n$$$. You have to divide it into two sets $$$A$$$ and $$$B$$$ in such a way that each element belongs to exactly one set and $$$|sum(A) - sum(B)|$$$ is minimum possible.The value $$$|x|$$$ is the absolute value of $$$x$$$ and $$$sum(S)$$$ is the sum of elements of the set $$$S$$$.", "input_spec": "The first line of the input contains one integer $$$n$$$ ($$$1 \\le n \\le 2 \\cdot 10^9$$$).", "output_spec": "Print one integer \u2014 the minimum possible value of $$$|sum(A) - sum(B)|$$$ if you divide the initial sequence $$$1, 2, \\dots, n$$$ into two sets $$$A$$$ and $$$B$$$.", "sample_inputs": ["3", "5", "6"], "sample_outputs": ["0", "1", "1"], "notes": "NoteSome (not all) possible answers to examples:In the first example you can divide the initial sequence into sets $$$A = \\{1, 2\\}$$$ and $$$B = \\{3\\}$$$ so the answer is $$$0$$$.In the second example you can divide the initial sequence into sets $$$A = \\{1, 3, 4\\}$$$ and $$$B = \\{2, 5\\}$$$ so the answer is $$$1$$$.In the third example you can divide the initial sequence into sets $$$A = \\{1, 4, 5\\}$$$ and $$$B = \\{2, 3, 6\\}$$$ so the answer is $$$1$$$."}, "src_uid": "fa163c5b619d3892e33e1fb9c22043a9"}
{"nl": {"description": "ZS the Coder loves to read the dictionary. He thinks that a word is nice if there exists a substring (contiguous segment of letters) of it of length 26 where each letter of English alphabet appears exactly once. In particular, if the string has length strictly less than 26, no such substring exists and thus it is not nice.Now, ZS the Coder tells you a word, where some of its letters are missing as he forgot them. He wants to determine if it is possible to fill in the missing letters so that the resulting word is nice. If it is possible, he needs you to find an example of such a word as well. Can you help him?", "input_spec": "The first and only line of the input contains a single string s (1\u2009\u2264\u2009|s|\u2009\u2264\u200950\u2009000), the word that ZS the Coder remembers. Each character of the string is the uppercase letter of English alphabet ('A'-'Z') or is a question mark ('?'), where the question marks denotes the letters that ZS the Coder can't remember.", "output_spec": "If there is no way to replace all the question marks with uppercase letters such that the resulting word is nice, then print \u2009-\u20091 in the only line. Otherwise, print a string which denotes a possible nice word that ZS the Coder learned. This string should match the string from the input, except for the question marks replaced with uppercase English letters. If there are multiple solutions, you may print any of them.", "sample_inputs": ["ABC??FGHIJK???OPQR?TUVWXY?", "WELCOMETOCODEFORCESROUNDTHREEHUNDREDANDSEVENTYTWO", "??????????????????????????", "AABCDEFGHIJKLMNOPQRSTUVW??M"], "sample_outputs": ["ABCDEFGHIJKLMNOPQRZTUVWXYS", "-1", "MNBVCXZLKJHGFDSAQPWOEIRUYT", "-1"], "notes": "NoteIn the first sample case, ABCDEFGHIJKLMNOPQRZTUVWXYS is a valid answer beacuse it contains a substring of length 26 (the whole string in this case) which contains all the letters of the English alphabet exactly once. Note that there are many possible solutions, such as ABCDEFGHIJKLMNOPQRSTUVWXYZ or ABCEDFGHIJKLMNOPQRZTUVWXYS.In the second sample case, there are no missing letters. In addition, the given string does not have a substring of length 26 that contains all the letters of the alphabet, so the answer is \u2009-\u20091.In the third sample case, any string of length 26 that contains all letters of the English alphabet fits as an answer."}, "src_uid": "a249431a4b0b1ade652997fe0b82edf3"}
{"nl": {"description": "You are given an array of positive integers a1,\u2009a2,\u2009...,\u2009an\u2009\u00d7\u2009T of length n\u2009\u00d7\u2009T. We know that for any i\u2009>\u2009n it is true that ai\u2009=\u2009ai\u2009-\u2009n. Find the length of the longest non-decreasing sequence of the given array.", "input_spec": "The first line contains two space-separated integers: n, T (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009T\u2009\u2264\u2009107). The second line contains n space-separated integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009300).", "output_spec": "Print a single number \u2014 the length of a sought sequence.", "sample_inputs": ["4 3\n3 1 4 2"], "sample_outputs": ["5"], "notes": "NoteThe array given in the sample looks like that: 3, 1, 4, 2, 3, 1, 4, 2, 3, 1, 4, 2. The elements in bold form the largest non-decreasing subsequence. "}, "src_uid": "26cf484fa4cb3dc2ab09adce7a3fc9b2"}
{"nl": {"description": "Golorps are mysterious creatures who feed on variables. Golorp's name is a program in some programming language. Some scientists believe that this language is Befunge; golorps are tantalizingly silent.Variables consumed by golorps can take values from 0 to 9, inclusive. For each golorp its daily diet is defined by its name. Some golorps are so picky that they can't be fed at all. Besides, all golorps are very health-conscious and try to eat as little as possible. Given a choice of several valid sequences of variable values, each golorp will choose lexicographically smallest one.For the purposes of this problem you can assume that a golorp consists of jaws and a stomach. The number of variables necessary to feed a golorp is defined by the shape of its jaws. Variables can get to the stomach only via the jaws.A hungry golorp is visiting you. You know its name; feed it or figure out that it's impossible.", "input_spec": "The input is a single string (between 13 and 1024 characters long) \u2014 the name of the visiting golorp. All names are similar and will resemble the ones given in the samples. The name is guaranteed to be valid.", "output_spec": "Output lexicographically smallest sequence of variable values fit for feeding this golorp. Values should be listed in the order in which they get into the jaws. If the golorp is impossible to feed, output \"false\".", "sample_inputs": ["?(_-_/___*__):-___>__.", "?(__-_+_/_____):-__>__,_____<__.", "?(______________________/____+_______*__-_____*______-___):-__<___,___<____,____<_____,_____<______,______<_______.", "?(__+___+__-___):-___>__."], "sample_outputs": ["0010", "false", "0250341", "0101"], "notes": null}, "src_uid": "390a0b72c77ebe5881b656830fbfae02"}
{"nl": {"description": "Everybody knows of spaghetti sort. You decided to implement an analog sorting algorithm yourself, but as you survey your pantry you realize you're out of spaghetti! The only type of pasta you have is ravioli, but you are not going to let this stop you...You come up with the following algorithm. For each number in the array ai, build a stack of ai ravioli. The image shows the stack for ai\u2009=\u20094.  Arrange the stacks in one row in the order in which the corresponding numbers appear in the input array. Find the tallest one (if there are several stacks of maximal height, use the leftmost one). Remove it and add its height to the end of the output array. Shift the stacks in the row so that there is no gap between them. Repeat the procedure until all stacks have been removed.At first you are very happy with your algorithm, but as you try it on more inputs you realize that it doesn't always produce the right sorted array. Turns out when two stacks of ravioli are next to each other (at any step of the process) and differ in height by two or more, the top ravioli of the taller stack slides down on top of the lower stack.Given an input array, figure out whether the described algorithm will sort it correctly.", "input_spec": "The first line of input contains a single number n (1\u2009\u2264\u2009n\u2009\u2264\u200910) \u2014 the size of the array. The second line of input contains n space-separated integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 the elements of the array.", "output_spec": "Output \"YES\" if the array can be sorted using the described procedure and \"NO\" if it can not.", "sample_inputs": ["3\n1 2 3", "3\n3 1 2"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the second example the array will change even before the tallest stack is chosen for the first time: ravioli from stack of height 3 will slide on the stack of height 1, and the algorithm will output an array {2,\u20092,\u20092}."}, "src_uid": "704d0ae50bccaa8bc49319812ae0be45"}
{"nl": {"description": "Limak and Radewoosh are going to compete against each other in the upcoming algorithmic contest. They are equally skilled but they won't solve problems in the same order.There will be n problems. The i-th problem has initial score pi and it takes exactly ti minutes to solve it. Problems are sorted by difficulty\u00a0\u2014 it's guaranteed that pi\u2009<\u2009pi\u2009+\u20091 and ti\u2009<\u2009ti\u2009+\u20091.A constant c is given too, representing the speed of loosing points. Then, submitting the i-th problem at time x (x minutes after the start of the contest) gives max(0,\u2009 pi\u2009-\u2009c\u00b7x) points.Limak is going to solve problems in order 1,\u20092,\u2009...,\u2009n (sorted increasingly by pi). Radewoosh is going to solve them in order n,\u2009n\u2009-\u20091,\u2009...,\u20091 (sorted decreasingly by pi). Your task is to predict the outcome\u00a0\u2014 print the name of the winner (person who gets more points at the end) or a word \"Tie\" in case of a tie.You may assume that the duration of the competition is greater or equal than the sum of all ti. That means both Limak and Radewoosh will accept all n problems.", "input_spec": "The first line contains two integers n and c (1\u2009\u2264\u2009n\u2009\u2264\u200950,\u20091\u2009\u2264\u2009c\u2009\u2264\u20091000)\u00a0\u2014 the number of problems and the constant representing the speed of loosing points. The second line contains n integers p1,\u2009p2,\u2009...,\u2009pn (1\u2009\u2264\u2009pi\u2009\u2264\u20091000,\u2009pi\u2009<\u2009pi\u2009+\u20091)\u00a0\u2014 initial scores. The third line contains n integers t1,\u2009t2,\u2009...,\u2009tn (1\u2009\u2264\u2009ti\u2009\u2264\u20091000,\u2009ti\u2009<\u2009ti\u2009+\u20091) where ti denotes the number of minutes one needs to solve the i-th problem.", "output_spec": "Print \"Limak\" (without quotes) if Limak will get more points in total. Print \"Radewoosh\" (without quotes) if Radewoosh will get more points in total. Print \"Tie\" (without quotes) if Limak and Radewoosh will get the same total number of points.", "sample_inputs": ["3 2\n50 85 250\n10 15 25", "3 6\n50 85 250\n10 15 25", "8 1\n10 20 30 40 50 60 70 80\n8 10 58 63 71 72 75 76"], "sample_outputs": ["Limak", "Radewoosh", "Tie"], "notes": "NoteIn the first sample, there are 3 problems. Limak solves them as follows:  Limak spends 10 minutes on the 1-st problem and he gets 50\u2009-\u2009c\u00b710\u2009=\u200950\u2009-\u20092\u00b710\u2009=\u200930 points.  Limak spends 15 minutes on the 2-nd problem so he submits it 10\u2009+\u200915\u2009=\u200925 minutes after the start of the contest. For the 2-nd problem he gets 85\u2009-\u20092\u00b725\u2009=\u200935 points.  He spends 25 minutes on the 3-rd problem so he submits it 10\u2009+\u200915\u2009+\u200925\u2009=\u200950 minutes after the start. For this problem he gets 250\u2009-\u20092\u00b750\u2009=\u2009150 points. So, Limak got 30\u2009+\u200935\u2009+\u2009150\u2009=\u2009215 points.Radewoosh solves problem in the reversed order:  Radewoosh solves 3-rd problem after 25 minutes so he gets 250\u2009-\u20092\u00b725\u2009=\u2009200 points.  He spends 15 minutes on the 2-nd problem so he submits it 25\u2009+\u200915\u2009=\u200940 minutes after the start. He gets 85\u2009-\u20092\u00b740\u2009=\u20095 points for this problem.  He spends 10 minutes on the 1-st problem so he submits it 25\u2009+\u200915\u2009+\u200910\u2009=\u200950 minutes after the start. He gets max(0,\u200950\u2009-\u20092\u00b750)\u2009=\u2009max(0,\u2009\u2009-\u200950)\u2009=\u20090 points. Radewoosh got 200\u2009+\u20095\u2009+\u20090\u2009=\u2009205 points in total. Limak has 215 points so Limak wins.In the second sample, Limak will get 0 points for each problem and Radewoosh will first solve the hardest problem and he will get 250\u2009-\u20096\u00b725\u2009=\u2009100 points for that. Radewoosh will get 0 points for other two problems but he is the winner anyway.In the third sample, Limak will get 2 points for the 1-st problem and 2 points for the 2-nd problem. Radewoosh will get 4 points for the 8-th problem. They won't get points for other problems and thus there is a tie because 2\u2009+\u20092\u2009=\u20094."}, "src_uid": "8c704de75ab85f9e2c04a926143c8b4a"}
{"nl": {"description": "There are n types of coins in Byteland. Conveniently, the denomination of the coin type k divides the denomination of the coin type k\u2009+\u20091, the denomination of the coin type 1 equals 1 tugrick. The ratio of the denominations of coin types k\u2009+\u20091 and k equals ak. It is known that for each x there are at most 20 coin types of denomination x.Byteasar has bk coins of type k with him, and he needs to pay exactly m tugricks. It is known that Byteasar never has more than 3\u00b7105 coins with him. Byteasar want to know how many ways there are to pay exactly m tugricks. Two ways are different if there is an integer k such that the amount of coins of type k differs in these two ways. As all Byteland citizens, Byteasar wants to know the number of ways modulo 109\u2009+\u20097.", "input_spec": "The first line contains single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20093\u00b7105)\u00a0\u2014 the number of coin types. The second line contains n\u2009-\u20091 integers a1, a2, ..., an\u2009-\u20091 (1\u2009\u2264\u2009ak\u2009\u2264\u2009109)\u00a0\u2014 the ratios between the coin types denominations. It is guaranteed that for each x there are at most 20 coin types of denomination x. The third line contains n non-negative integers b1, b2, ..., bn\u00a0\u2014 the number of coins of each type Byteasar has. It is guaranteed that the sum of these integers doesn't exceed 3\u00b7105. The fourth line contains single integer m (0\u2009\u2264\u2009m\u2009<\u20091010000)\u00a0\u2014 the amount in tugricks Byteasar needs to pay.", "output_spec": "Print single integer\u00a0\u2014 the number of ways to pay exactly m tugricks modulo 109\u2009+\u20097.", "sample_inputs": ["1\n\n4\n2", "2\n1\n4 4\n2", "3\n3 3\n10 10 10\n17"], "sample_outputs": ["1", "3", "6"], "notes": "NoteIn the first example Byteasar has 4 coins of denomination 1, and he has to pay 2 tugricks. There is only one way.In the second example Byteasar has 4 coins of each of two different types of denomination 1, he has to pay 2 tugricks. There are 3 ways: pay one coin of the first type and one coin of the other, pay two coins of the first type, and pay two coins of the second type.In the third example the denominations are equal to 1, 3, 9."}, "src_uid": "71b23bc529ee1484d9dcea84def45d53"}
{"nl": {"description": "Let's define the permutation of length n as an array p\u2009=\u2009[p1,\u2009p2,\u2009...,\u2009pn] consisting of n distinct integers from range from 1 to n. We say that this permutation maps value 1 into the value p1, value 2 into the value p2 and so on.Kyota Ootori has just learned about cyclic representation of a permutation. A cycle is a sequence of numbers such that each element of this sequence is being mapped into the next element of this sequence (and the last element of the cycle is being mapped into the first element of the cycle). The cyclic representation is a representation of p as a collection of cycles forming p. For example, permutation p\u2009=\u2009[4,\u20091,\u20096,\u20092,\u20095,\u20093] has a cyclic representation that looks like (142)(36)(5) because 1 is replaced by 4, 4 is replaced by 2, 2 is replaced by 1, 3 and 6 are swapped, and 5 remains in place. Permutation may have several cyclic representations, so Kyoya defines the standard cyclic representation of a permutation as follows. First, reorder the elements within each cycle so the largest element is first. Then, reorder all of the cycles so they are sorted by their first element. For our example above, the standard cyclic representation of [4,\u20091,\u20096,\u20092,\u20095,\u20093] is (421)(5)(63).Now, Kyoya notices that if we drop the parenthesis in the standard cyclic representation, we get another permutation! For instance, [4,\u20091,\u20096,\u20092,\u20095,\u20093] will become [4,\u20092,\u20091,\u20095,\u20096,\u20093].Kyoya notices that some permutations don't change after applying operation described above at all. He wrote all permutations of length n that do not change in a list in lexicographic order. Unfortunately, his friend Tamaki Suoh lost this list. Kyoya wishes to reproduce the list and he needs your help. Given the integers n and k, print the permutation that was k-th on Kyoya's list.", "input_spec": "The first line will contain two integers n, k (1\u2009\u2264\u2009n\u2009\u2264\u200950, 1\u2009\u2264\u2009k\u2009\u2264\u2009min{1018,\u2009l} where l is the length of the Kyoya's list).", "output_spec": "Print n space-separated integers, representing the permutation that is the answer for the question. ", "sample_inputs": ["4 3", "10 1"], "sample_outputs": ["1 3 2 4", "1 2 3 4 5 6 7 8 9 10"], "notes": "NoteThe standard cycle representation is (1)(32)(4), which after removing parenthesis gives us the original permutation. The first permutation on the list would be [1,\u20092,\u20093,\u20094], while the second permutation would be [1,\u20092,\u20094,\u20093]."}, "src_uid": "e03c6d3bb8cf9119530668765691a346"}
{"nl": {"description": "Mahmoud has n line segments, the i-th of them has length ai. Ehab challenged him to use exactly 3 line segments to form a non-degenerate triangle. Mahmoud doesn't accept challenges unless he is sure he can win, so he asked you to tell him if he should accept the challenge. Given the lengths of the line segments, check if he can choose exactly 3 of them to form a non-degenerate triangle.Mahmoud should use exactly 3 line segments, he can't concatenate two line segments or change any length. A non-degenerate triangle is a triangle with positive area.", "input_spec": "The first line contains single integer n (3\u2009\u2264\u2009n\u2009\u2264\u2009105)\u00a0\u2014 the number of line segments Mahmoud has. The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009109)\u00a0\u2014 the lengths of line segments Mahmoud has.", "output_spec": "In the only line print \"YES\" if he can choose exactly three line segments and form a non-degenerate triangle with them, and \"NO\" otherwise.", "sample_inputs": ["5\n1 5 3 2 4", "3\n4 1 2"], "sample_outputs": ["YES", "NO"], "notes": "NoteFor the first example, he can use line segments with lengths 2, 4 and 5 to form a non-degenerate triangle."}, "src_uid": "897bd80b79df7b1143b652655b9a6790"}
{"nl": {"description": "There is a white sheet of paper lying on a rectangle table. The sheet is a rectangle with its sides parallel to the sides of the table. If you will take a look from above and assume that the bottom left corner of the table has coordinates $$$(0, 0)$$$, and coordinate axes are left and bottom sides of the table, then the bottom left corner of the white sheet has coordinates $$$(x_1, y_1)$$$, and the top right \u2014 $$$(x_2, y_2)$$$.After that two black sheets of paper are placed on the table. Sides of both black sheets are also parallel to the sides of the table. Coordinates of the bottom left corner of the first black sheet are $$$(x_3, y_3)$$$, and the top right \u2014 $$$(x_4, y_4)$$$. Coordinates of the bottom left corner of the second black sheet are $$$(x_5, y_5)$$$, and the top right \u2014 $$$(x_6, y_6)$$$.     Example of three rectangles. Determine if some part of the white sheet can be seen from the above after the two black sheets are placed. The part of the white sheet can be seen if there is at least one point lying not strictly inside the white sheet and strictly outside of both black sheets.", "input_spec": "The first line of the input contains four integers $$$x_1, y_1, x_2, y_2$$$ $$$(0 \\le x_1 < x_2 \\le 10^{6}, 0 \\le y_1 < y_2 \\le 10^{6})$$$ \u2014 coordinates of the bottom left and the top right corners of the white sheet. The second line of the input contains four integers $$$x_3, y_3, x_4, y_4$$$ $$$(0 \\le x_3 < x_4 \\le 10^{6}, 0 \\le y_3 < y_4 \\le 10^{6})$$$ \u2014 coordinates of the bottom left and the top right corners of the first black sheet. The third line of the input contains four integers $$$x_5, y_5, x_6, y_6$$$ $$$(0 \\le x_5 < x_6 \\le 10^{6}, 0 \\le y_5 < y_6 \\le 10^{6})$$$ \u2014 coordinates of the bottom left and the top right corners of the second black sheet. The sides of each sheet of paper are parallel (perpendicular) to the coordinate axes.", "output_spec": "If some part of the white sheet can be seen from the above after the two black sheets are placed, print \"YES\" (without quotes). Otherwise print \"NO\".", "sample_inputs": ["2 2 4 4\n1 1 3 5\n3 1 5 5", "3 3 7 5\n0 0 4 6\n0 0 7 4", "5 2 10 5\n3 1 7 6\n8 1 11 7", "0 0 1000000 1000000\n0 0 499999 1000000\n500000 0 1000000 1000000"], "sample_outputs": ["NO", "YES", "YES", "YES"], "notes": "NoteIn the first example the white sheet is fully covered by black sheets.In the second example the part of the white sheet can be seen after two black sheets are placed. For example, the point $$$(6.5, 4.5)$$$ lies not strictly inside the white sheet and lies strictly outside of both black sheets."}, "src_uid": "05c90c1d75d76a522241af6bb6af7781"}
{"nl": {"description": "Limak is going to participate in a contest on the last day of the 2016. The contest will start at 20:00 and will last four hours, exactly until midnight. There will be n problems, sorted by difficulty, i.e. problem 1 is the easiest and problem n is the hardest. Limak knows it will take him 5\u00b7i minutes to solve the i-th problem.Limak's friends organize a New Year's Eve party and Limak wants to be there at midnight or earlier. He needs k minutes to get there from his house, where he will participate in the contest first.How many problems can Limak solve if he wants to make it to the party?", "input_spec": "The only line of the input contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u200910, 1\u2009\u2264\u2009k\u2009\u2264\u2009240)\u00a0\u2014 the number of the problems in the contest and the number of minutes Limak needs to get to the party from his house.", "output_spec": "Print one integer, denoting the maximum possible number of problems Limak can solve so that he could get to the party at midnight or earlier.", "sample_inputs": ["3 222", "4 190", "7 1"], "sample_outputs": ["2", "4", "7"], "notes": "NoteIn the first sample, there are 3 problems and Limak needs 222 minutes to get to the party. The three problems require 5, 10 and 15 minutes respectively. Limak can spend 5\u2009+\u200910\u2009=\u200915 minutes to solve first two problems. Then, at 20:15 he can leave his house to get to the party at 23:57 (after 222 minutes). In this scenario Limak would solve 2 problems. He doesn't have enough time to solve 3 problems so the answer is 2.In the second sample, Limak can solve all 4 problems in 5\u2009+\u200910\u2009+\u200915\u2009+\u200920\u2009=\u200950 minutes. At 20:50 he will leave the house and go to the party. He will get there exactly at midnight.In the third sample, Limak needs only 1 minute to get to the party. He has enough time to solve all 7 problems."}, "src_uid": "41e554bc323857be7b8483ee358a35e2"}
{"nl": {"description": "There are $$$n$$$ heroes fighting in the arena. Initially, the $$$i$$$-th hero has $$$a_i$$$ health points.The fight in the arena takes place in several rounds. At the beginning of each round, each alive hero deals $$$1$$$ damage to all other heroes. Hits of all heroes occur simultaneously. Heroes whose health is less than $$$1$$$ at the end of the round are considered killed.If exactly $$$1$$$ hero remains alive after a certain round, then he is declared the winner. Otherwise, there is no winner.Your task is to calculate the number of ways to choose the initial health points for each hero $$$a_i$$$, where $$$1 \\le a_i \\le x$$$, so that there is no winner of the fight. The number of ways can be very large, so print it modulo $$$998244353$$$. Two ways are considered different if at least one hero has a different amount of health. For example, $$$[1, 2, 1]$$$ and $$$[2, 1, 1]$$$ are different.", "input_spec": "The only line contains two integers $$$n$$$ and $$$x$$$ ($$$2 \\le n \\le 500; 1 \\le x \\le 500$$$).", "output_spec": "Print one integer\u00a0\u2014 the number of ways to choose the initial health points for each hero $$$a_i$$$, where $$$1 \\le a_i \\le x$$$, so that there is no winner of the fight, taken modulo $$$998244353$$$. ", "sample_inputs": ["2 5", "3 3", "5 4", "13 37"], "sample_outputs": ["5", "15", "1024", "976890680"], "notes": null}, "src_uid": "1908d1c8c6b122a4c6633a7af094f17f"}
{"nl": {"description": "Gaius Julius Caesar, a famous general, loved to line up his soldiers. Overall the army had n1 footmen and n2 horsemen. Caesar thought that an arrangement is not beautiful if somewhere in the line there are strictly more that k1 footmen standing successively one after another, or there are strictly more than k2 horsemen standing successively one after another. Find the number of beautiful arrangements of the soldiers. Note that all n1\u2009+\u2009n2 warriors should be present at each arrangement. All footmen are considered indistinguishable among themselves. Similarly, all horsemen are considered indistinguishable among themselves.", "input_spec": "The only line contains four space-separated integers n1, n2, k1, k2 (1\u2009\u2264\u2009n1,\u2009n2\u2009\u2264\u2009100,\u20091\u2009\u2264\u2009k1,\u2009k2\u2009\u2264\u200910) which represent how many footmen and horsemen there are and the largest acceptable number of footmen and horsemen standing in succession, correspondingly.", "output_spec": "Print the number of beautiful arrangements of the army modulo 100000000 (108). That is, print the number of such ways to line up the soldiers, that no more than k1 footmen stand successively, and no more than k2 horsemen stand successively.", "sample_inputs": ["2 1 1 10", "2 3 1 2", "2 4 1 1"], "sample_outputs": ["1", "5", "0"], "notes": "NoteLet's mark a footman as 1, and a horseman as 2.In the first sample the only beautiful line-up is: 121In the second sample 5 beautiful line-ups exist: 12122, 12212, 21212, 21221, 22121"}, "src_uid": "63aabef26fe008e4c6fc9336eb038289"}
{"nl": {"description": "Some days ago, I learned the concept of LCM (least common multiple). I've played with it for several times and I want to make a big number with it.But I also don't want to use many numbers, so I'll choose three positive integers (they don't have to be distinct) which are not greater than n. Can you help me to find the maximum possible least common multiple of these three integers?", "input_spec": "The first line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009106) \u2014 the n mentioned in the statement.", "output_spec": "Print a single integer \u2014 the maximum possible LCM of three not necessarily distinct positive integers that are not greater than n.", "sample_inputs": ["9", "7"], "sample_outputs": ["504", "210"], "notes": "NoteThe least common multiple of some positive integers is the least positive integer which is multiple for each of them.The result may become very large, 32-bit integer won't be enough. So using 64-bit integers is recommended.For the last example, we can chose numbers 7, 6, 5 and the LCM of them is 7\u00b76\u00b75\u2009=\u2009210. It is the maximum value we can get."}, "src_uid": "25e5afcdf246ee35c9cef2fcbdd4566e"}
{"nl": {"description": "Kolya is very absent-minded. Today his math teacher asked him to solve a simple problem with the equation $$$a + 1 = b$$$ with positive integers $$$a$$$ and $$$b$$$, but Kolya forgot the numbers $$$a$$$ and $$$b$$$. He does, however, remember that the first (leftmost) digit of $$$a$$$ was $$$d_a$$$, and the first (leftmost) digit of $$$b$$$ was $$$d_b$$$.Can you reconstruct any equation $$$a + 1 = b$$$ that satisfies this property? It may be possible that Kolya misremembers the digits, and there is no suitable equation, in which case report so.", "input_spec": "The only line contains two space-separated digits $$$d_a$$$ and $$$d_b$$$ ($$$1 \\leq d_a, d_b \\leq 9$$$).", "output_spec": "If there is no equation $$$a + 1 = b$$$ with positive integers $$$a$$$ and $$$b$$$ such that the first digit of $$$a$$$ is $$$d_a$$$, and the first digit of $$$b$$$ is $$$d_b$$$, print a single number $$$-1$$$. Otherwise, print any suitable $$$a$$$ and $$$b$$$ that both are positive and do not exceed $$$10^9$$$. It is guaranteed that if a solution exists, there also exists a solution with both numbers not exceeding $$$10^9$$$.", "sample_inputs": ["1 2", "4 4", "5 7", "6 2"], "sample_outputs": ["199 200", "412 413", "-1", "-1"], "notes": null}, "src_uid": "3eff6f044c028146bea5f0dfd2870d23"}
{"nl": {"description": "Little Artem got n stones on his birthday and now wants to give some of them to Masha. He knows that Masha cares more about the fact of receiving the present, rather than the value of that present, so he wants to give her stones as many times as possible. However, Masha remembers the last present she received, so Artem can't give her the same number of stones twice in a row. For example, he can give her 3 stones, then 1 stone, then again 3 stones, but he can't give her 3 stones and then again 3 stones right after that.How many times can Artem give presents to Masha?", "input_spec": "The only line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009109)\u00a0\u2014 number of stones Artem received on his birthday.", "output_spec": "Print the maximum possible number of times Artem can give presents to Masha.", "sample_inputs": ["1", "2", "3", "4"], "sample_outputs": ["1", "1", "2", "3"], "notes": "NoteIn the first sample, Artem can only give 1 stone to Masha.In the second sample, Atrem can give Masha 1 or 2 stones, though he can't give her 1 stone two times.In the third sample, Atrem can first give Masha 2 stones, a then 1 more stone.In the fourth sample, Atrem can first give Masha 1 stone, then 2 stones, and finally 1 stone again."}, "src_uid": "a993069e35b35ae158d35d6fe166aaef"}
{"nl": {"description": "One day Vasya was lying in bed watching his electronic clock to fall asleep quicker.Vasya lives in a strange country, where days have h hours, and every hour has m minutes. Clock shows time in decimal number system, in format H:M, where the string H always has a fixed length equal to the number of digits in the decimal representation of number h\u2009-\u20091. To achieve this, leading zeros are added if necessary. The string M has a similar format, and its length is always equal to the number of digits in the decimal representation of number m\u2009-\u20091. For example, if h\u2009=\u200917, m\u2009=\u20091000, then time equal to 13 hours and 75 minutes will be displayed as \"13:075\".Vasya had been watching the clock from h1 hours m1 minutes to h2 hours m2 minutes inclusive, and then he fell asleep. Now he asks you to count how many times he saw the moment at which at least k digits changed on the clock simultaneously.For example, when switching 04:19 \u2009\u2192\u2009 04:20 two digits change. When switching 23:59 \u2009\u2192\u2009 00:00, four digits change.Consider that Vasya has been watching the clock for strictly less than one day. Note that the last time Vasya saw on the clock before falling asleep was \"h2:m2\". That is, Vasya didn't see the moment at which time \"h2:m2\" switched to the next value.", "input_spec": "The first line of the input file contains three space-separated integers h, m and k (2\u2009\u2264\u2009h,\u2009m\u2009\u2264\u2009109, 1\u2009\u2264\u2009k\u2009\u2264\u200920). The second line contains space-separated integers h1, m1 (0\u2009\u2264\u2009h1\u2009<\u2009h, 0\u2009\u2264\u2009m1\u2009<\u2009m). The third line contains space-separated integers h2, m2 (0\u2009\u2264\u2009h2\u2009<\u2009h, 0\u2009\u2264\u2009m2\u2009<\u2009m).", "output_spec": "Print a single number \u2014 the number of times Vasya saw the moment of changing at least k digits simultaneously. Please do not use the %lld specificator to read or write 64-bit integers in C++. It is preferred to use the cin stream (also you may use the %I64d specificator).", "sample_inputs": ["5 5 2\n4 4\n2 1", "24 60 1\n0 0\n23 59", "24 60 3\n23 59\n23 59"], "sample_outputs": ["3", "1439", "0"], "notes": "NoteIn the first example Vasya will see the following moments of time: 4:4  0:0 \u2009\u2192\u2009 0:1 \u2009\u2192\u2009 0:2 \u2009\u2192\u2009 0:3 \u2009\u2192\u2009 0:4  1:0 \u2009\u2192\u2009 1:1 \u2009\u2192\u2009 1:2 \u2009\u2192\u2009 1:3 \u2009\u2192\u2009 1:4  2:0 \u2009\u2192\u2009 2:1 \u2009\u2192\u2009 2:2 \u2009\u2192\u2009 2:3 \u2009\u2192\u2009 2:4. Double arrow () marks the sought moments of time (in this example \u2014 when Vasya sees two numbers changing simultaneously).In the second example k\u2009=\u20091. Any switching time can be accepted, since during switching of the clock at least one digit is changed. Total switching equals to 24\u00b760\u2009=\u20091440, but Vasya have not seen one of them \u2014 the switching of 23:59  00:00.In the third example Vasya fell asleep immediately after he began to look at the clock, so he did not see any change."}, "src_uid": "e2782743229645ad3a0f8e815d86dc5f"}
{"nl": {"description": "There is a field of size $$$2 \\times 2$$$. Each cell of this field can either contain grass or be empty. The value $$$a_{i, j}$$$ is $$$1$$$ if the cell $$$(i, j)$$$ contains grass, or $$$0$$$ otherwise.In one move, you can choose one row and one column and cut all the grass in this row and this column. In other words, you choose the row $$$x$$$ and the column $$$y$$$, then you cut the grass in all cells $$$a_{x, i}$$$ and all cells $$$a_{i, y}$$$ for all $$$i$$$ from $$$1$$$ to $$$2$$$. After you cut the grass from a cell, it becomes empty (i.\u2009e. its value is replaced by $$$0$$$).Your task is to find the minimum number of moves required to cut the grass in all non-empty cells of the field (i.\u2009e. make all $$$a_{i, j}$$$ zeros).You have to answer $$$t$$$ independent test cases.", "input_spec": "The first line of the input contains one integer $$$t$$$ ($$$1 \\le t \\le 16$$$) \u2014 the number of test cases. Then $$$t$$$ test cases follow. The test case consists of two lines, each of these lines contains two integers. The $$$j$$$-th integer in the $$$i$$$-th row is $$$a_{i, j}$$$. If $$$a_{i, j} = 0$$$ then the cell $$$(i, j)$$$ is empty, and if $$$a_{i, j} = 1$$$ the cell $$$(i, j)$$$ contains grass.", "output_spec": "For each test case, print one integer \u2014 the minimum number of moves required to cut the grass in all non-empty cells of the field (i.\u2009e. make all $$$a_{i, j}$$$ zeros) in the corresponding test case.", "sample_inputs": ["3\n\n0 0\n\n0 0\n\n1 0\n\n0 1\n\n1 1\n\n1 1"], "sample_outputs": ["0\n1\n2"], "notes": null}, "src_uid": "7336b8becd2438f0439240ee8f9610ec"}
{"nl": {"description": "Polycarp urgently needs a shovel! He comes to the shop and chooses an appropriate one. The shovel that Policarp chooses is sold for k burles. Assume that there is an unlimited number of such shovels in the shop.In his pocket Polycarp has an unlimited number of \"10-burle coins\" and exactly one coin of r burles (1\u2009\u2264\u2009r\u2009\u2264\u20099).What is the minimum number of shovels Polycarp has to buy so that he can pay for the purchase without any change? It is obvious that he can pay for 10 shovels without any change (by paying the requied amount of 10-burle coins and not using the coin of r burles). But perhaps he can buy fewer shovels and pay without any change. Note that Polycarp should buy at least one shovel.", "input_spec": "The single line of input contains two integers k and r (1\u2009\u2264\u2009k\u2009\u2264\u20091000, 1\u2009\u2264\u2009r\u2009\u2264\u20099)\u00a0\u2014 the price of one shovel and the denomination of the coin in Polycarp's pocket that is different from \"10-burle coins\".  Remember that he has an unlimited number of coins in the denomination of 10, that is, Polycarp has enough money to buy any number of shovels.", "output_spec": "Print the required minimum number of shovels Polycarp has to buy so that he can pay for them without any change. ", "sample_inputs": ["117 3", "237 7", "15 2"], "sample_outputs": ["9", "1", "2"], "notes": "NoteIn the first example Polycarp can buy 9 shovels and pay 9\u00b7117\u2009=\u20091053 burles. Indeed, he can pay this sum by using 10-burle coins and one 3-burle coin. He can't buy fewer shovels without any change.In the second example it is enough for Polycarp to buy one shovel.In the third example Polycarp should buy two shovels and pay 2\u00b715\u2009=\u200930 burles. It is obvious that he can pay this sum without any change. "}, "src_uid": "18cd1cd809df4744bb7bcd7cad94e2d3"}
{"nl": {"description": "Igor K. always used to trust his favorite Kashpirovsky Antivirus. That is why he didn't hesitate to download the link one of his groupmates sent him via QIP Infinium. The link was said to contain \"some real funny stuff about swine influenza\". The antivirus had no objections and Igor K. run the flash application he had downloaded. Immediately his QIP Infinium said: \"invalid login/password\".Igor K. entered the ISQ from his additional account and looked at the info of his main one. His name and surname changed to \"H1N1\" and \"Infected\" correspondingly, and the \"Additional Information\" field contained a strange-looking binary code 80 characters in length, consisting of zeroes and ones. \"I've been hacked\" \u2014 thought Igor K. and run the Internet Exploiter browser to quickly type his favourite search engine's address.Soon he learned that it really was a virus that changed ISQ users' passwords. Fortunately, he soon found out that the binary code was actually the encrypted password where each group of 10 characters stood for one decimal digit. Accordingly, the original password consisted of 8 decimal digits.Help Igor K. restore his ISQ account by the encrypted password and encryption specification.", "input_spec": "The input data contains 11 lines. The first line represents the binary code 80 characters in length. That is the code written in Igor K.'s ISQ account's info. Next 10 lines contain pairwise distinct binary codes 10 characters in length, corresponding to numbers 0, 1, ..., 9.", "output_spec": "Print one line containing 8 characters \u2014 The password to Igor K.'s ISQ account. It is guaranteed that the solution exists.", "sample_inputs": ["01001100100101100000010110001001011001000101100110010110100001011010100101101100\n0100110000\n0100110010\n0101100000\n0101100010\n0101100100\n0101100110\n0101101000\n0101101010\n0101101100\n0101101110", "10101101111001000010100100011010101101110010110111011000100011011110010110001000\n1001000010\n1101111001\n1001000110\n1010110111\n0010110111\n1101001101\n1011000001\n1110010101\n1011011000\n0110001000"], "sample_outputs": ["12345678", "30234919"], "notes": null}, "src_uid": "0f4f7ca388dd1b2192436c67f9ac74d9"}
{"nl": {"description": "Fangy collects cookies. Once he decided to take a box and put cookies into it in some way. If we take a square k\u2009\u00d7\u2009k in size, divided into blocks 1\u2009\u00d7\u20091 in size and paint there the main diagonal together with cells, which lie above it, then the painted area will be equal to the area occupied by one cookie k in size. Fangy also has a box with a square base 2n\u2009\u00d7\u20092n, divided into blocks 1\u2009\u00d7\u20091 in size. In a box the cookies should not overlap, and they should not be turned over or rotated. See cookies of sizes 2 and 4 respectively on the figure:    To stack the cookies the little walrus uses the following algorithm. He takes out of the repository the largest cookie which can fit in some place in the box and puts it there. Everything could be perfect but alas, in the repository the little walrus has infinitely many cookies of size 2 and larger, and there are no cookies of size 1, therefore, empty cells will remain in the box. Fangy wants to know how many empty cells will be left in the end.", "input_spec": "The first line contains a single integer n (0\u2009\u2264\u2009n\u2009\u2264\u20091000).", "output_spec": "Print the single number, equal to the number of empty cells in the box. The answer should be printed modulo 106\u2009+\u20093.", "sample_inputs": ["3"], "sample_outputs": ["9"], "notes": "NoteIf the box possesses the base of 23\u2009\u00d7\u200923 (as in the example), then the cookies will be put there in the following manner: "}, "src_uid": "1a335a9638523ca0315282a67e18eec7"}
{"nl": {"description": "++++++++[>+>++>+++>++++>+++++>++++++>+++++++>++++++++>+++++++++>++++++++++>+\n++++++++++>++++++++++++>+++++++++++++>++++++++++++++>+++++++++++++++>+++++++\n+++++++++<<<<<<<<<<<<<<<<-]>>>>>>>>>>.<<<<<<<<<<>>>>>>>>>>>>>>++.--<<<<<<<<<\n<<<<<>>>>>>>>>>>>>+.-<<<<<<<<<<<<<>>>>>>>>>>>>>>--.++<<<<<<<<<<<<<<>>>>>>>>>\n>>>>>>----.++++<<<<<<<<<<<<<<<>>>>.<<<<>>>>>>>>>>>>>>--.++<<<<<<<<<<<<<<>>>>\n>>>>>>>>>>>---.+++<<<<<<<<<<<<<<<>>>>>>>>>>>>>>---.+++<<<<<<<<<<<<<<>>>>>>>>\n>>>>++.--<<<<<<<<<<<<>>>>>>>>>>>>>---.+++<<<<<<<<<<<<<>>>>>>>>>>>>>>++.--<<<\n<<<<<<<<<<<.\n\nDCBA:^!~}|{zyxwvutsrqponmlkjihgfedcba`_^]\\[ZYXWVUTSRQPONMLKJIHdcbD`Y^]\\UZYRv\n9876543210/.-,+*)('&%$#\"!~}|{zyxwvutsrqponm+*)('&%$#cya`=^]\\[ZYXWVUTSRQPONML\nKJfe^cba`_X]VzTYRv98TSRQ3ONMLEi,+*)('&%$#\"!~}|{zyxwvutsrqponmlkjihgfedcba`_^\n]\\[ZYXWVUTSonPlkjchg`ed]#DCBA@?>=<;:9876543OHGLKDIHGFE>b%$#\"!~}|{zyxwvutsrqp\nonmlkjihgfedcba`_^]\\[ZYXWVUTSRQPONMibafedcba`_X|?>Z<XWVUTSRKo\\\n v34*8+6+,78+9*3+,93+9*5+,28+9*1+,55+9*4+,23*6*2*,91,@,+7*9*25,*48,+3*9+38,+<\n>62*9*2+,34*9*3+,66+9*8+,52*9*7+,75+9*8+,92+9*6+,48+9*3+,43*9*2+,84*,26*9*3^", "input_spec": "The input contains a single integer a (0\u2009\u2264\u2009a\u2009\u2264\u20091\u2009000\u2009000).", "output_spec": "Output a single integer.", "sample_inputs": ["129"], "sample_outputs": ["1"], "notes": null}, "src_uid": "ec539775f2b3358a92a99a644e2480ce"}
{"nl": {"description": "A bus moves along the coordinate line Ox from the point x\u2009=\u20090 to the point x\u2009=\u2009a. After starting from the point x\u2009=\u20090, it reaches the point x\u2009=\u2009a, immediately turns back and then moves to the point x\u2009=\u20090. After returning to the point x\u2009=\u20090 it immediately goes back to the point x\u2009=\u2009a and so on. Thus, the bus moves from x\u2009=\u20090 to x\u2009=\u2009a and back. Moving from the point x\u2009=\u20090 to x\u2009=\u2009a or from the point x\u2009=\u2009a to x\u2009=\u20090 is called a bus journey. In total, the bus must make k journeys.The petrol tank of the bus can hold b liters of gasoline. To pass a single unit of distance the bus needs to spend exactly one liter of gasoline. The bus starts its first journey with a full petrol tank.There is a gas station in point x\u2009=\u2009f. This point is between points x\u2009=\u20090 and x\u2009=\u2009a. There are no other gas stations on the bus route. While passing by a gas station in either direction the bus can stop and completely refuel its tank. Thus, after stopping to refuel the tank will contain b liters of gasoline.What is the minimum number of times the bus needs to refuel at the point x\u2009=\u2009f to make k journeys? The first journey starts in the point x\u2009=\u20090.", "input_spec": "The first line contains four integers a, b, f, k (0\u2009<\u2009f\u2009<\u2009a\u2009\u2264\u2009106, 1\u2009\u2264\u2009b\u2009\u2264\u2009109, 1\u2009\u2264\u2009k\u2009\u2264\u2009104) \u2014 the endpoint of the first bus journey, the capacity of the fuel tank of the bus, the point where the gas station is located, and the required number of journeys.", "output_spec": "Print the minimum number of times the bus needs to refuel to make k journeys. If it is impossible for the bus to make k journeys, print -1.", "sample_inputs": ["6 9 2 4", "6 10 2 4", "6 5 4 3"], "sample_outputs": ["4", "2", "-1"], "notes": "NoteIn the first example the bus needs to refuel during each journey.In the second example the bus can pass 10 units of distance without refueling. So the bus makes the whole first journey, passes 4 units of the distance of the second journey and arrives at the point with the gas station. Then it can refuel its tank, finish the second journey and pass 2 units of distance from the third journey. In this case, it will again arrive at the point with the gas station. Further, he can refill the tank up to 10 liters to finish the third journey and ride all the way of the fourth journey. At the end of the journey the tank will be empty. In the third example the bus can not make all 3 journeys because if it refuels during the second journey, the tanks will contain only 5 liters of gasoline, but the bus needs to pass 8 units of distance until next refueling."}, "src_uid": "283aff24320c6518e8518d4b045e1eca"}
{"nl": {"description": "Furik loves writing all sorts of problems, especially such that he can't solve himself. You've got one of his problems, the one Furik gave to Rubik. And Rubik asks you to solve it.There is integer n and array a, consisting of ten integers, indexed by numbers from 0 to 9. Your task is to count the number of positive integers with the following properties:  the number's length does not exceed n;  the number doesn't have leading zeroes;  digit i (0\u2009\u2264\u2009i\u2009\u2264\u20099) occurs in the number at least a[i] times. ", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100). The next line contains 10 integers a[0], a[1], ..., a[9] (0\u2009\u2264\u2009a[i]\u2009\u2264\u2009100) \u2014 elements of array a. The numbers are separated by spaces.", "output_spec": "On a single line print the remainder of dividing the answer to the problem by 1000000007 (109\u2009+\u20097).", "sample_inputs": ["1\n0 0 0 0 0 0 0 0 0 1", "2\n1 1 0 0 0 0 0 0 0 0", "3\n1 1 0 0 0 0 0 0 0 0"], "sample_outputs": ["1", "1", "36"], "notes": "NoteIn the first sample number 9 meets the requirements.In the second sample number 10 meets the requirements.In the third sample numbers 10, 110, 210, 120, 103 meet the requirements. There are other suitable numbers, 36 in total."}, "src_uid": "c1b5169a5c3b1bd4a2f1df1069ee7755"}
{"nl": {"description": "Monocarp is playing a video game. In the game, he controls a spaceship and has to destroy an enemy spaceship.Monocarp has two lasers installed on his spaceship. Both lasers $$$1$$$ and $$$2$$$ have two values:   $$$p_i$$$\u00a0\u2014 the power of the laser;  $$$t_i$$$\u00a0\u2014 the reload time of the laser. When a laser is fully charged, Monocarp can either shoot it or wait for the other laser to charge and shoot both of them at the same time.An enemy spaceship has $$$h$$$ durability and $$$s$$$ shield capacity. When Monocarp shoots an enemy spaceship, it receives $$$(P - s)$$$ damage (i.\u2009e. $$$(P - s)$$$ gets subtracted from its durability), where $$$P$$$ is the total power of the lasers that Monocarp shoots (i.\u2009e. $$$p_i$$$ if he only shoots laser $$$i$$$ and $$$p_1 + p_2$$$ if he shoots both lasers at the same time). An enemy spaceship is considered destroyed when its durability becomes $$$0$$$ or lower.Initially, both lasers are zero charged.What's the lowest amount of time it can take Monocarp to destroy an enemy spaceship?", "input_spec": "The first line contains two integers $$$p_1$$$ and $$$t_1$$$ ($$$2 \\le p_1 \\le 5000$$$; $$$1 \\le t_1 \\le 10^{12}$$$)\u00a0\u2014 the power and the reload time of the first laser. The second line contains two integers $$$p_2$$$ and $$$t_2$$$ ($$$2 \\le p_2 \\le 5000$$$; $$$1 \\le t_2 \\le 10^{12}$$$)\u00a0\u2014 the power and the reload time of the second laser. The third line contains two integers $$$h$$$ and $$$s$$$ ($$$1 \\le h \\le 5000$$$; $$$1 \\le s < \\min(p_1, p_2)$$$)\u00a0\u2014 the durability and the shield capacity of an enemy spaceship. Note that the last constraint implies that Monocarp will always be able to destroy an enemy spaceship.", "output_spec": "Print a single integer\u00a0\u2014 the lowest amount of time it can take Monocarp to destroy an enemy spaceship.", "sample_inputs": ["5 10\n4 9\n16 1", "10 1\n5000 100000\n25 9"], "sample_outputs": ["20", "25"], "notes": "NoteIn the first example, Monocarp waits for both lasers to charge, then shoots both lasers at $$$10$$$, they deal $$$(5 + 4 - 1) = 8$$$ damage. Then he waits again and shoots lasers at $$$20$$$, dealing $$$8$$$ more damage.In the second example, Monocarp doesn't wait for the second laser to charge. He just shoots the first laser $$$25$$$ times, dealing $$$(10 - 9) = 1$$$ damage each time."}, "src_uid": "ca9d48e48e69b931236907a9ac262433"}
{"nl": {"description": "You have r red, g green and b blue balloons. To decorate a single table for the banquet you need exactly three balloons. Three balloons attached to some table shouldn't have the same color. What maximum number t of tables can be decorated if we know number of balloons of each color?Your task is to write a program that for given values r, g and b will find the maximum number t of tables, that can be decorated in the required manner.", "input_spec": "The single line contains three integers r, g and b (0\u2009\u2264\u2009r,\u2009g,\u2009b\u2009\u2264\u20092\u00b7109) \u2014 the number of red, green and blue baloons respectively. The numbers are separated by exactly one space.", "output_spec": "Print a single integer t \u2014 the maximum number of tables that can be decorated in the required manner.", "sample_inputs": ["5 4 3", "1 1 1", "2 3 3"], "sample_outputs": ["4", "1", "2"], "notes": "NoteIn the first sample you can decorate the tables with the following balloon sets: \"rgg\", \"gbb\", \"brr\", \"rrg\", where \"r\", \"g\" and \"b\" represent the red, green and blue balls, respectively."}, "src_uid": "bae7cbcde19114451b8712d6361d2b01"}
{"nl": {"description": "Polycarp knows that if the sum of the digits of a number is divisible by $$$3$$$, then the number itself is divisible by $$$3$$$. He assumes that the numbers, the sum of the digits of which is divisible by $$$4$$$, are also somewhat interesting. Thus, he considers a positive integer $$$n$$$ interesting if its sum of digits is divisible by $$$4$$$.Help Polycarp find the nearest larger or equal interesting number for the given number $$$a$$$. That is, find the interesting number $$$n$$$ such that $$$n \\ge a$$$ and $$$n$$$ is minimal.", "input_spec": "The only line in the input contains an integer $$$a$$$ ($$$1 \\le a \\le 1000$$$).", "output_spec": "Print the nearest greater or equal interesting number for the given number $$$a$$$. In other words, print the interesting number $$$n$$$ such that $$$n \\ge a$$$ and $$$n$$$ is minimal.", "sample_inputs": ["432", "99", "237", "42"], "sample_outputs": ["435", "103", "237", "44"], "notes": null}, "src_uid": "bb6fb9516b2c55d1ee47a30d423562d7"}
{"nl": {"description": "Vasilisa the Wise from the Kingdom of Far Far Away got a magic box with a secret as a present from her friend Hellawisa the Wise from the Kingdom of A Little Closer. However, Vasilisa the Wise does not know what the box's secret is, since she cannot open it again. She hopes that you will help her one more time with that.The box's lock looks as follows: it contains 4 identical deepenings for gems as a 2\u2009\u00d7\u20092 square, and some integer numbers are written at the lock's edge near the deepenings. The example of a lock is given on the picture below.  The box is accompanied with 9 gems. Their shapes match the deepenings' shapes and each gem contains one number from 1 to 9 (each number is written on exactly one gem). The box will only open after it is decorated with gems correctly: that is, each deepening in the lock should be filled with exactly one gem. Also, the sums of numbers in the square's rows, columns and two diagonals of the square should match the numbers written at the lock's edge. For example, the above lock will open if we fill the deepenings with gems with numbers as is shown on the picture below.  Now Vasilisa the Wise wants to define, given the numbers on the box's lock, which gems she should put in the deepenings to open the box. Help Vasilisa to solve this challenging task.", "input_spec": "The input contains numbers written on the edges of the lock of the box. The first line contains space-separated integers r1 and r2 that define the required sums of numbers in the rows of the square. The second line contains space-separated integers c1 and c2 that define the required sums of numbers in the columns of the square. The third line contains space-separated integers d1 and d2 that define the required sums of numbers on the main and on the side diagonals of the square (1\u2009\u2264\u2009r1,\u2009r2,\u2009c1,\u2009c2,\u2009d1,\u2009d2\u2009\u2264\u200920). Correspondence between the above 6 variables and places where they are written is shown on the picture below. For more clarifications please look at the second sample test that demonstrates the example given in the problem statement.   ", "output_spec": "Print the scheme of decorating the box with stones: two lines containing two space-separated integers from 1 to 9. The numbers should be pairwise different. If there is no solution for the given lock, then print the single number \"-1\" (without the quotes). If there are several solutions, output any.", "sample_inputs": ["3 7\n4 6\n5 5", "11 10\n13 8\n5 16", "1 2\n3 4\n5 6", "10 10\n10 10\n10 10"], "sample_outputs": ["1 2\n3 4", "4 7\n9 1", "-1", "-1"], "notes": "NotePay attention to the last test from the statement: it is impossible to open the box because for that Vasilisa the Wise would need 4 identical gems containing number \"5\". However, Vasilisa only has one gem with each number from 1 to 9."}, "src_uid": "6821f502f5b6ec95c505e5dd8f3cd5d3"}
{"nl": {"description": "Once upon a time there were several little pigs and several wolves on a two-dimensional grid of size n\u2009\u00d7\u2009m. Each cell in this grid was either empty, containing one little pig, or containing one wolf.A little pig and a wolf are adjacent if the cells that they are located at share a side. The little pigs are afraid of wolves, so there will be at most one wolf adjacent to each little pig. But each wolf may be adjacent to any number of little pigs.They have been living peacefully for several years. But today the wolves got hungry. One by one, each wolf will choose one of the little pigs adjacent to it (if any), and eats the poor little pig. This process is not repeated. That is, each wolf will get to eat at most one little pig. Once a little pig gets eaten, it disappears and cannot be eaten by any other wolf.What is the maximum number of little pigs that may be eaten by the wolves?", "input_spec": "The first line contains integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200910) which denotes the number of rows and columns in our two-dimensional grid, respectively. Then follow n lines containing m characters each \u2014 that is the grid description. \".\" means that this cell is empty. \"P\" means that this cell contains a little pig. \"W\" means that this cell contains a wolf.  It is guaranteed that there will be at most one wolf adjacent to any little pig.", "output_spec": "Print a single number \u2014 the maximal number of little pigs that may be eaten by the wolves.", "sample_inputs": ["2 3\nPPW\nW.P", "3 3\nP.W\n.P.\nW.P"], "sample_outputs": ["2", "0"], "notes": "NoteIn the first example, one possible scenario in which two little pigs get eaten by the wolves is as follows.   "}, "src_uid": "969b24ed98d916184821b2b2f8fd3aac"}
{"nl": {"description": "It's New Year's Eve soon, so Ivan decided it's high time he started setting the table. Ivan has bought two cakes and cut them into pieces: the first cake has been cut into a pieces, and the second one \u2014 into b pieces.Ivan knows that there will be n people at the celebration (including himself), so Ivan has set n plates for the cakes. Now he is thinking about how to distribute the cakes between the plates. Ivan wants to do it in such a way that all following conditions are met:  Each piece of each cake is put on some plate;  Each plate contains at least one piece of cake;  No plate contains pieces of both cakes. To make his guests happy, Ivan wants to distribute the cakes in such a way that the minimum number of pieces on the plate is maximized. Formally, Ivan wants to know the maximum possible number x such that he can distribute the cakes according to the aforementioned conditions, and each plate will contain at least x pieces of cake.Help Ivan to calculate this number x!", "input_spec": "The first line contains three integers n, a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009100, 2\u2009\u2264\u2009n\u2009\u2264\u2009a\u2009+\u2009b) \u2014 the number of plates, the number of pieces of the first cake, and the number of pieces of the second cake, respectively.", "output_spec": "Print the maximum possible number x such that Ivan can distribute the cake in such a way that each plate will contain at least x pieces of cake.", "sample_inputs": ["5 2 3", "4 7 10"], "sample_outputs": ["1", "3"], "notes": "NoteIn the first example there is only one way to distribute cakes to plates, all of them will have 1 cake on it.In the second example you can have two plates with 3 and 4 pieces of the first cake and two plates both with 5 pieces of the second cake. Minimal number of pieces is 3."}, "src_uid": "a254b1e3451c507cf7ce3e2496b3d69e"}
{"nl": {"description": "There are n walruses sitting in a circle. All of them are numbered in the clockwise order: the walrus number 2 sits to the left of the walrus number 1, the walrus number 3 sits to the left of the walrus number 2, ..., the walrus number 1 sits to the left of the walrus number n.The presenter has m chips. The presenter stands in the middle of the circle and starts giving the chips to the walruses starting from walrus number 1 and moving clockwise. The walrus number i gets i chips. If the presenter can't give the current walrus the required number of chips, then the presenter takes the remaining chips and the process ends. Determine by the given n and m how many chips the presenter will get in the end.", "input_spec": "The first line contains two integers n and m (1\u2009\u2264\u2009n\u2009\u2264\u200950, 1\u2009\u2264\u2009m\u2009\u2264\u2009104) \u2014 the number of walruses and the number of chips correspondingly.", "output_spec": "Print the number of chips the presenter ended up with.", "sample_inputs": ["4 11", "17 107", "3 8"], "sample_outputs": ["0", "2", "1"], "notes": "NoteIn the first sample the presenter gives one chip to the walrus number 1, two chips to the walrus number 2, three chips to the walrus number 3, four chips to the walrus number 4, then again one chip to the walrus number 1. After that the presenter runs out of chips. He can't give anything to the walrus number 2 and the process finishes.In the third sample the presenter gives one chip to the walrus number 1, two chips to the walrus number 2, three chips to the walrus number 3, then again one chip to the walrus number 1. The presenter has one chip left and he can't give two chips to the walrus number 2, that's why the presenter takes the last chip."}, "src_uid": "5dd5ee90606d37cae5926eb8b8d250bb"}
{"nl": {"description": "Dreamoon loves summing up something for no reason. One day he obtains two integers a and b occasionally. He wants to calculate the sum of all nice integers. Positive integer x is called nice if  and , where k is some integer number in range [1,\u2009a].By  we denote the quotient of integer division of x and y. By  we denote the remainder of integer division of x and y. You can read more about these operations here: http://goo.gl/AcsXhT.The answer may be large, so please print its remainder modulo 1\u2009000\u2009000\u2009007 (109\u2009+\u20097). Can you compute it faster than Dreamoon?", "input_spec": "The single line of the input contains two integers a, b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009107).", "output_spec": "Print a single integer representing the answer modulo 1\u2009000\u2009000\u2009007 (109\u2009+\u20097).", "sample_inputs": ["1 1", "2 2"], "sample_outputs": ["0", "8"], "notes": "NoteFor the first sample, there are no nice integers because  is always zero.For the second sample, the set of nice integers is {3,\u20095}."}, "src_uid": "cd351d1190a92d094b2d929bf1e5c44f"}
{"nl": {"description": "Valera has got n domino pieces in a row. Each piece consists of two halves \u2014 the upper one and the lower one. Each of the halves contains a number from 1 to 6. Valera loves even integers very much, so he wants the sum of the numbers on the upper halves and the sum of the numbers on the lower halves to be even.To do that, Valera can rotate the dominoes by 180 degrees. After the rotation the upper and the lower halves swap places. This action takes one second. Help Valera find out the minimum time he must spend rotating dominoes to make his wish come true.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100), denoting the number of dominoes Valera has. Next n lines contain two space-separated integers xi,\u2009yi (1\u2009\u2264\u2009xi,\u2009yi\u2009\u2264\u20096). Number xi is initially written on the upper half of the i-th domino, yi is initially written on the lower half.", "output_spec": "Print a single number \u2014 the minimum required number of seconds. If Valera can't do the task in any time, print \u2009-\u20091.", "sample_inputs": ["2\n4 2\n6 4", "1\n2 3", "3\n1 4\n2 3\n4 4"], "sample_outputs": ["0", "-1", "1"], "notes": "NoteIn the first test case the sum of the numbers on the upper halves equals 10 and the sum of the numbers on the lower halves equals 6. Both numbers are even, so Valera doesn't required to do anything.In the second sample Valera has only one piece of domino. It is written 3 on the one of its halves, therefore one of the sums will always be odd.In the third case Valera can rotate the first piece, and after that the sum on the upper halves will be equal to 10, and the sum on the lower halves will be equal to 8."}, "src_uid": "f9bc04aed2b84c7dd288749ac264bb43"}
{"nl": {"description": "You are given two set of points. The first set is determined by the equation A1x\u2009+\u2009B1y\u2009+\u2009C1\u2009=\u20090, and the second one is determined by the equation A2x\u2009+\u2009B2y\u2009+\u2009C2\u2009=\u20090.Write the program which finds the number of points in the intersection of two given sets.", "input_spec": "The first line of the input contains three integer numbers A1,\u2009B1,\u2009C1 separated by space. The second line contains three integer numbers A2,\u2009B2,\u2009C2 separated by space. All the numbers are between -100 and 100, inclusive.", "output_spec": "Print the number of points in the intersection or -1 if there are infinite number of points.", "sample_inputs": ["1 1 0\n2 2 0", "1 1 0\n2 -2 0"], "sample_outputs": ["-1", "1"], "notes": null}, "src_uid": "c8e869cb17550e888733551c749f2e1a"}
{"nl": {"description": "Ayoub had an array $$$a$$$ of integers of size $$$n$$$ and this array had two interesting properties:   All the integers in the array were between $$$l$$$ and $$$r$$$ (inclusive).  The sum of all the elements was divisible by $$$3$$$. Unfortunately, Ayoub has lost his array, but he remembers the size of the array $$$n$$$ and the numbers $$$l$$$ and $$$r$$$, so he asked you to find the number of ways to restore the array. Since the answer could be very large, print it modulo $$$10^9 + 7$$$ (i.e. the remainder when dividing by $$$10^9 + 7$$$). In case there are no satisfying arrays (Ayoub has a wrong memory), print $$$0$$$.", "input_spec": "The first and only line contains three integers $$$n$$$, $$$l$$$ and $$$r$$$ ($$$1 \\le n \\le 2 \\cdot 10^5 , 1 \\le l \\le r \\le 10^9$$$)\u00a0\u2014 the size of the lost array and the range of numbers in the array.", "output_spec": "Print the remainder when dividing by $$$10^9 + 7$$$ the number of ways to restore the array.", "sample_inputs": ["2 1 3", "3 2 2", "9 9 99"], "sample_outputs": ["3", "1", "711426616"], "notes": "NoteIn the first example, the possible arrays are : $$$[1,2], [2,1], [3, 3]$$$.In the second example, the only possible array is $$$[2, 2, 2]$$$."}, "src_uid": "4c4852df62fccb0a19ad8bc41145de61"}
{"nl": {"description": "Ann has recently started commuting by subway. We know that a one ride subway ticket costs a rubles. Besides, Ann found out that she can buy a special ticket for m rides (she can buy it several times). It costs b rubles. Ann did the math; she will need to use subway n times. Help Ann, tell her what is the minimum sum of money she will have to spend to make n rides?", "input_spec": "The single line contains four space-separated integers n, m, a, b (1\u2009\u2264\u2009n,\u2009m,\u2009a,\u2009b\u2009\u2264\u20091000) \u2014 the number of rides Ann has planned, the number of rides covered by the m ride ticket, the price of a one ride ticket and the price of an m ride ticket. ", "output_spec": "Print a single integer \u2014 the minimum sum in rubles that Ann will need to spend.", "sample_inputs": ["6 2 1 2", "5 2 2 3"], "sample_outputs": ["6", "8"], "notes": "NoteIn the first sample one of the optimal solutions is: each time buy a one ride ticket. There are other optimal solutions. For example, buy three m ride tickets."}, "src_uid": "faa343ad6028c5a069857a38fa19bb24"}
{"nl": {"description": "Stepan has n pens. Every day he uses them, and on the i-th day he uses the pen number i. On the (n\u2009+\u20091)-th day again he uses the pen number 1, on the (n\u2009+\u20092)-th \u2014 he uses the pen number 2 and so on.On every working day (from Monday to Saturday, inclusive) Stepan spends exactly 1 milliliter of ink of the pen he uses that day. On Sunday Stepan has a day of rest, he does not stend the ink of the pen he uses that day. Stepan knows the current volume of ink in each of his pens. Now it's the Monday morning and Stepan is going to use the pen number 1 today. Your task is to determine which pen will run out of ink before all the rest (that is, there will be no ink left in it), if Stepan will use the pens according to the conditions described above.", "input_spec": "The first line contains the integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950\u2009000) \u2014 the number of pens Stepan has. The second line contains the sequence of integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009109), where ai is equal to the number of milliliters of ink which the pen number i currently has.", "output_spec": "Print the index of the pen which will run out of ink before all (it means that there will be no ink left in it), if Stepan will use pens according to the conditions described above.  Pens are numbered in the order they are given in input data. The numeration begins from one.  Note that the answer is always unambiguous, since several pens can not end at the same time.", "sample_inputs": ["3\n3 3 3", "5\n5 4 5 4 4"], "sample_outputs": ["2", "5"], "notes": "NoteIn the first test Stepan uses ink of pens as follows:   on the day number 1 (Monday) Stepan will use the pen number 1, after that there will be 2 milliliters of ink in it;  on the day number 2 (Tuesday) Stepan will use the pen number 2, after that there will be 2 milliliters of ink in it;  on the day number 3 (Wednesday) Stepan will use the pen number 3, after that there will be 2 milliliters of ink in it;  on the day number 4 (Thursday) Stepan will use the pen number 1, after that there will be 1 milliliters of ink in it;  on the day number 5 (Friday) Stepan will use the pen number 2, after that there will be 1 milliliters of ink in it;  on the day number 6 (Saturday) Stepan will use the pen number 3, after that there will be 1 milliliters of ink in it;  on the day number 7 (Sunday) Stepan will use the pen number 1, but it is a day of rest so he will not waste ink of this pen in it;  on the day number 8 (Monday) Stepan will use the pen number 2, after that this pen will run out of ink. So, the first pen which will not have ink is the pen number 2."}, "src_uid": "8054dc5dd09d600d7fb8d9f5db4dcaca"}
{"nl": {"description": "In Berland a money reform is being prepared. New coins are being introduced. After long economic calculations was decided that the most expensive coin should possess the denomination of exactly n Berland dollars. Also the following restriction has been introduced for comfort: the denomination of each coin should be divisible by the denomination of any cheaper coin. It is known that among all the possible variants the variant with the largest number of new coins will be chosen. Find this variant. Print in the order of decreasing of the coins' denominations.", "input_spec": "The first and only line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009106) which represents the denomination of the most expensive coin. ", "output_spec": "Print the denominations of all the coins in the order of decreasing. The number of coins must be the largest possible (with the given denomination n of the most expensive coin). Also, the denomination of every coin must be divisible by the denomination of any cheaper coin. Naturally, the denominations of all the coins should be different. If there are several solutins to that problem, print any of them.", "sample_inputs": ["10", "4", "3"], "sample_outputs": ["10 5 1", "4 2 1", "3 1"], "notes": null}, "src_uid": "2fc946bb72f56b6d86eabfaf60f9fa63"}
{"nl": {"description": "Way to go! Heidi now knows how many brains there must be for her to get one. But throwing herself in the midst of a clutch of hungry zombies is quite a risky endeavor. Hence Heidi wonders: what is the smallest number of brains that must be in the chest for her to get out at all (possibly empty-handed, but alive)?The brain dinner night will evolve just as in the previous subtask: the same crowd is present, the N\u2009-\u20091 zombies have the exact same mindset as before and Heidi is to make the first proposal, which must be accepted by at least half of the attendees for her to survive.", "input_spec": "The only line of input contains one integer: N, the number of attendees (1\u2009\u2264\u2009N\u2009\u2264\u2009109).", "output_spec": "Output one integer: the smallest number of brains in the chest which allows Heidi to merely survive.", "sample_inputs": ["1", "3", "99"], "sample_outputs": ["0", "1", "49"], "notes": null}, "src_uid": "422abdf2f705c069e540d4f5c09a4948"}
{"nl": {"description": "Luke Skywalker got locked up in a rubbish shredder between two presses. R2D2 is already working on his rescue, but Luke needs to stay alive as long as possible. For simplicity we will assume that everything happens on a straight line, the presses are initially at coordinates 0 and L, and they move towards each other with speed v1 and v2, respectively. Luke has width d and is able to choose any position between the presses. Luke dies as soon as the distance between the presses is less than his width. Your task is to determine for how long Luke can stay alive.", "input_spec": "The first line of the input contains four integers d, L, v1, v2 (1\u2009\u2264\u2009d,\u2009L,\u2009v1,\u2009v2\u2009\u2264\u200910\u2009000,\u2009d\u2009<\u2009L)\u00a0\u2014 Luke's width, the initial position of the second press and the speed of the first and second presses, respectively.", "output_spec": "Print a single real value\u00a0\u2014 the maximum period of time Luke can stay alive for. Your answer will be considered correct if its absolute or relative error does not exceed 10\u2009-\u20096.  Namely: let's assume that your answer is a, and the answer of the jury is b. The checker program will consider your answer correct, if .", "sample_inputs": ["2 6 2 2", "1 9 1 2"], "sample_outputs": ["1.00000000000000000000", "2.66666666666666650000"], "notes": "NoteIn the first sample Luke should stay exactly in the middle of the segment, that is at coordinates [2;4], as the presses move with the same speed.In the second sample he needs to occupy the position . In this case both presses move to his edges at the same time."}, "src_uid": "f34f3f974a21144b9f6e8615c41830f5"}
{"nl": {"description": "Hongcow is learning to spell! One day, his teacher gives him a word that he needs to learn to spell. Being a dutiful student, he immediately learns how to spell the word.Hongcow has decided to try to make new words from this one. He starts by taking the word he just learned how to spell, and moves the last character of the word to the beginning of the word. He calls this a cyclic shift. He can apply cyclic shift many times. For example, consecutively applying cyclic shift operation to the word \"abracadabra\" Hongcow will get words \"aabracadabr\", \"raabracadab\" and so on.Hongcow is now wondering how many distinct words he can generate by doing the cyclic shift arbitrarily many times. The initial string is also counted.", "input_spec": "The first line of input will be a single string s (1\u2009\u2264\u2009|s|\u2009\u2264\u200950), the word Hongcow initially learns how to spell. The string s consists only of lowercase English letters ('a'\u2013'z').", "output_spec": "Output a single integer equal to the number of distinct strings that Hongcow can obtain by applying the cyclic shift arbitrarily many times to the given string.", "sample_inputs": ["abcd", "bbb", "yzyz"], "sample_outputs": ["4", "1", "2"], "notes": "NoteFor the first sample, the strings Hongcow can generate are \"abcd\", \"dabc\", \"cdab\", and \"bcda\".For the second sample, no matter how many times Hongcow does the cyclic shift, Hongcow can only generate \"bbb\".For the third sample, the two strings Hongcow can generate are \"yzyz\" and \"zyzy\"."}, "src_uid": "8909ac99ed4ab2ee4d681ec864c7831e"}
{"nl": {"description": "A New Year party is not a New Year party without lemonade! As usual, you are expecting a lot of guests, and buying lemonade has already become a pleasant necessity.Your favorite store sells lemonade in bottles of n different volumes at different costs. A single bottle of type i has volume 2i\u2009-\u20091 liters and costs ci roubles. The number of bottles of each type in the store can be considered infinite.You want to buy at least L liters of lemonade. How many roubles do you have to spend?", "input_spec": "The first line contains two integers n and L (1\u2009\u2264\u2009n\u2009\u2264\u200930; 1\u2009\u2264\u2009L\u2009\u2264\u2009109)\u00a0\u2014 the number of types of bottles in the store and the required amount of lemonade in liters, respectively. The second line contains n integers c1,\u2009c2,\u2009...,\u2009cn (1\u2009\u2264\u2009ci\u2009\u2264\u2009109)\u00a0\u2014 the costs of bottles of different types.", "output_spec": "Output a single integer\u00a0\u2014 the smallest number of roubles you have to pay in order to buy at least L liters of lemonade.", "sample_inputs": ["4 12\n20 30 70 90", "4 3\n10000 1000 100 10", "4 3\n10 100 1000 10000", "5 787787787\n123456789 234567890 345678901 456789012 987654321"], "sample_outputs": ["150", "10", "30", "44981600785557577"], "notes": "NoteIn the first example you should buy one 8-liter bottle for 90 roubles and two 2-liter bottles for 30 roubles each. In total you'll get 12 liters of lemonade for just 150 roubles.In the second example, even though you need only 3 liters, it's cheaper to buy a single 8-liter bottle for 10 roubles.In the third example it's best to buy three 1-liter bottles for 10 roubles each, getting three liters for 30 roubles."}, "src_uid": "04ca137d0383c03944e3ce1c502c635b"}
{"nl": {"description": "There are $$$n$$$ students in a university. The number of students is even. The $$$i$$$-th student has programming skill equal to $$$a_i$$$. The coach wants to form $$$\\frac{n}{2}$$$ teams. Each team should consist of exactly two students, and each student should belong to exactly one team. Two students can form a team only if their skills are equal (otherwise they cannot understand each other and cannot form a team).Students can solve problems to increase their skill. One solved problem increases the skill by one.The coach wants to know the minimum total number of problems students should solve to form exactly $$$\\frac{n}{2}$$$ teams (i.e. each pair of students should form a team). Your task is to find this number.", "input_spec": "The first line of the input contains one integer $$$n$$$ ($$$2 \\le n \\le 100$$$) \u2014 the number of students. It is guaranteed that $$$n$$$ is even. The second line of the input contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 100$$$), where $$$a_i$$$ is the skill of the $$$i$$$-th student.", "output_spec": "Print one number \u2014 the minimum total number of problems students should solve to form exactly $$$\\frac{n}{2}$$$ teams.", "sample_inputs": ["6\n5 10 2 3 14 5", "2\n1 100"], "sample_outputs": ["5", "99"], "notes": "NoteIn the first example the optimal teams will be: $$$(3, 4)$$$, $$$(1, 6)$$$ and $$$(2, 5)$$$, where numbers in brackets are indices of students. Then, to form the first team the third student should solve $$$1$$$ problem, to form the second team nobody needs to solve problems and to form the third team the second student should solve $$$4$$$ problems so the answer is $$$1 + 4 = 5$$$.In the second example the first student should solve $$$99$$$ problems to form a team with the second one."}, "src_uid": "55485fe203a114374f0aae93006278d3"}
{"nl": {"description": "Ilya got tired of sports programming, left university and got a job in the subway. He was given the task to determine the escalator load factor. Let's assume that n people stand in the queue for the escalator. At each second one of the two following possibilities takes place: either the first person in the queue enters the escalator with probability p, or the first person in the queue doesn't move with probability (1\u2009-\u2009p), paralyzed by his fear of escalators and making the whole queue wait behind him.Formally speaking, the i-th person in the queue cannot enter the escalator until people with indices from 1 to i\u2009-\u20091 inclusive enter it. In one second only one person can enter the escalator. The escalator is infinite, so if a person enters it, he never leaves it, that is he will be standing on the escalator at any following second. Ilya needs to count the expected value of the number of people standing on the escalator after t seconds. Your task is to help him solve this complicated task.", "input_spec": "The first line of the input contains three numbers n,\u2009p,\u2009t (1\u2009\u2264\u2009n,\u2009t\u2009\u2264\u20092000, 0\u2009\u2264\u2009p\u2009\u2264\u20091). Numbers n and t are integers, number p is real, given with exactly two digits after the decimal point.", "output_spec": "Print a single real number \u2014 the expected number of people who will be standing on the escalator after t seconds. The absolute or relative error mustn't exceed 10\u2009-\u20096.", "sample_inputs": ["1 0.50 1", "1 0.50 4", "4 0.20 2"], "sample_outputs": ["0.5", "0.9375", "0.4"], "notes": null}, "src_uid": "20873b1e802c7aa0e409d9f430516c1e"}
{"nl": {"description": "Sheldon, Leonard, Penny, Rajesh and Howard are in the queue for a \"Double Cola\" drink vending machine; there are no other people in the queue. The first one in the queue (Sheldon) buys a can, drinks it and doubles! The resulting two Sheldons go to the end of the queue. Then the next in the queue (Leonard) buys a can, drinks it and gets to the end of the queue as two Leonards, and so on. This process continues ad infinitum.For example, Penny drinks the third can of cola and the queue will look like this: Rajesh, Howard, Sheldon, Sheldon, Leonard, Leonard, Penny, Penny.Write a program that will print the name of a man who will drink the n-th can.Note that in the very beginning the queue looks like that: Sheldon, Leonard, Penny, Rajesh, Howard. The first person is Sheldon.", "input_spec": "The input data consist of a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009109). It is guaranteed that the pretests check the spelling of all the five names, that is, that they contain all the five possible answers.", "output_spec": "Print the single line \u2014 the name of the person who drinks the n-th can of cola. The cans are numbered starting from 1. Please note that you should spell the names like this: \"Sheldon\", \"Leonard\", \"Penny\", \"Rajesh\", \"Howard\" (without the quotes). In that order precisely the friends are in the queue initially.", "sample_inputs": ["1", "6", "1802"], "sample_outputs": ["Sheldon", "Sheldon", "Penny"], "notes": null}, "src_uid": "023b169765e81d896cdc1184e5a82b22"}
{"nl": {"description": "The Cybermen have again outwitted the Daleks! Unfortunately, this time the Daleks decided to abandon these tasks altogether, which means the Doctor has to deal with them.The Doctor can handle the Daleks on his own, but Heidi now has to make sure that the Cybermen are kept busy with this next task.There are $$$k$$$ rings on a plane. For each ring, $$$n$$$ points are uniformly sampled with a small random noise. The task is to recover the rings given only the noisy samples.The rings and the samples are generated as follows. The center of a ring is uniformly sampled from a disk of radius $$$1\\,000\\,000$$$ centered at the origin, and the radius of the ring is uniformly sampled from $$$[250\\,000, 750\\,000]$$$. Let $$$R$$$ be a ring with center $$$(x, y)$$$ and radius $$$r$$$. To sample a point from $$$R$$$, an angle $$$\\theta$$$ is uniformly sampled from $$$[0, 2\\pi]$$$ and a distance $$$d$$$ is uniformly sampled from $$$[0.9r, 1.1r]$$$. The coordinates of the sampled point are then $$$(x+d\\cos(\\theta), y+d\\sin(\\theta))$$$ rounded to the closest integers.The distance between rings is measured by their Hausdorff distance. In our case, the distance between two rings $$$R_1, R_2$$$ can be written as follow. Let $$$d$$$ be the distance between the two centers and $$$r_1, r_2$$$ be the radii. Then the distance is $$$$$$dist(R_1, R_2)=\\max(\\min(d_{--}, d_{-+}),\\min(d_{+-}, d_{++}), \\min(d_{--}, d_{+-}), \\min(d_{-+}, d_{++}))$$$$$$, where $$$d_{++}=|d+r_1+r_2|$$$, $$$d_{+-}=|d+r_1-r_2|$$$, $$$d_{-+}=|d-r_1+r_2|$$$, $$$d_{--}=|d-r_1-r_2|$$$.We say that a ring $$$R_0$$$ is recovered if one of the rings $$$R$$$ in the output has Hausdorff distance less than $$$100\\,000$$$ from $$$R_0$$$. An output is accepted if all the rings are recovered. It is guaranteed that the distances between any two rings is greater than $$$600\\,000$$$.Remember that a human can very easily solve this task, so make sure that no human traitors are helping the Cybermen complete this task.", "input_spec": "The first line contains an integer $$$k$$$ ($$$1 \\leq k \\leq 4$$$), the number of rings. The second line contains an integer $$$n$$$ ($$$100 \\leq n \\leq 1\\,000$$$), the number of samples per ring. The following $$$n \\times k$$$ lines contain the samples, one sample per line. Each line contains a pair of integers $$$x_i, y_i$$$, where $$$(x_i, y_i)$$$ are the coordinates of the $$$i$$$-th sample.", "output_spec": "Print $$$k$$$ lines, each describing a single ring. For each line, print three real numbers $$$x_i, y_i, r_i$$$, where $$$(x_i, y_i)$$$ and $$$r_i$$$ are the coordinates and the radius of the $$$i$$$-th ring. The order of the rings does not matter.", "sample_inputs": [], "sample_outputs": [], "notes": "NoteHere is how one of tests with $$$k=4$$$ and $$$n=100$$$ looks like.   You can download the sample input and output here."}, "src_uid": "e3f43a4cb8507c1fb5e896bd29eaa339"}
{"nl": {"description": "A string is called bracket sequence if it does not contain any characters other than \"(\" and \")\". A bracket sequence is called regular if it it is possible to obtain correct arithmetic expression by inserting characters \"+\" and \"1\" into this sequence. For example, \"\", \"(())\" and \"()()\" are regular bracket sequences; \"))\" and \")((\" are bracket sequences (but not regular ones), and \"(a)\" and \"(1)+(1)\" are not bracket sequences at all.You have a number of strings; each string is a bracket sequence of length $$$2$$$. So, overall you have $$$cnt_1$$$ strings \"((\", $$$cnt_2$$$ strings \"()\", $$$cnt_3$$$ strings \")(\" and $$$cnt_4$$$ strings \"))\". You want to write all these strings in some order, one after another; after that, you will get a long bracket sequence of length $$$2(cnt_1 + cnt_2 + cnt_3 + cnt_4)$$$. You wonder: is it possible to choose some order of the strings you have such that you will get a regular bracket sequence? Note that you may not remove any characters or strings, and you may not add anything either.", "input_spec": "The input consists of four lines, $$$i$$$-th of them contains one integer $$$cnt_i$$$ ($$$0 \\le cnt_i \\le 10^9$$$).", "output_spec": "Print one integer: $$$1$$$ if it is possible to form a regular bracket sequence by choosing the correct order of the given strings, $$$0$$$ otherwise.", "sample_inputs": ["3\n1\n4\n3", "0\n0\n0\n0", "1\n2\n3\n4"], "sample_outputs": ["1", "1", "0"], "notes": "NoteIn the first example it is possible to construct a string \"(())()(()((()()()())))\", which is a regular bracket sequence.In the second example it is possible to construct a string \"\", which is a regular bracket sequence."}, "src_uid": "b99578086043537297d374dc01eeb6f8"}
{"nl": {"description": "A classroom in a school has six rows with 3 desks in each row. Two people can use the same desk: one sitting on the left and one sitting on the right. Some places are already occupied, and some places are vacant. Petya has just entered the class and wants to occupy the most convenient place. The conveniences of the places are shown on the picture:  Here, the desks in the top row are the closest to the blackboard, while the desks in the bottom row are the furthest from the blackboard.You are given a plan of the class, where '*' denotes an occupied place, '.' denotes a vacant place, and the aisles are denoted by '-'. Find any of the most convenient vacant places for Petya.", "input_spec": "The input consists of 6 lines. Each line describes one row of desks, starting from the closest to the blackboard. Each line is given in the following format: two characters, each is '*' or '.' \u2014 the description of the left desk in the current row; a character '-' \u2014 the aisle; two characters, each is '*' or '.' \u2014 the description of the center desk in the current row; a character '-' \u2014 the aisle; two characters, each is '*' or '.' \u2014 the description of the right desk in the current row. So, the length of each of the six lines is 8. It is guaranteed that there is at least one vacant place in the classroom.", "output_spec": "Print the plan of the classroom after Petya takes one of the most convenient for him places. Mark this place with the letter 'P'. There should be exactly one letter 'P' in the plan. Petya can only take a vacant place. In all other places the output should coincide with the input. If there are multiple answers, print any.", "sample_inputs": ["..-**-..\n..-**-..\n..-..-..\n..-..-..\n..-..-..\n..-..-..", "**-**-**\n**-**-**\n..-**-.*\n**-**-**\n..-..-..\n..-**-..", "**-**-*.\n*.-*.-**\n**-**-**\n**-**-**\n..-..-..\n..-**-.."], "sample_outputs": ["..-**-..\n..-**-..\n..-..-..\n..-P.-..\n..-..-..\n..-..-..", "**-**-**\n**-**-**\n..-**-.*\n**-**-**\n..-P.-..\n..-**-..", "**-**-*.\n*.-*P-**\n**-**-**\n**-**-**\n..-..-..\n..-**-.."], "notes": "NoteIn the first example the maximum convenience is 3.In the second example the maximum convenience is 2.In the third example the maximum convenience is 4."}, "src_uid": "35503a2aeb18c8c1b3eda9de2c6ce33e"}
{"nl": {"description": "In this problem, we will consider complete undirected graphs consisting of $$$n$$$ vertices with weighted edges. The weight of each edge is an integer from $$$1$$$ to $$$k$$$.An undirected graph is considered beautiful if the sum of weights of all edges incident to vertex $$$1$$$ is equal to the weight of MST in the graph. MST is the minimum spanning tree\u00a0\u2014 a tree consisting of $$$n-1$$$ edges of the graph, which connects all $$$n$$$ vertices and has the minimum sum of weights among all such trees; the weight of MST is the sum of weights of all edges in it.Calculate the number of complete beautiful graphs having exactly $$$n$$$ vertices and the weights of edges from $$$1$$$ to $$$k$$$. Since the answer might be large, print it modulo $$$998244353$$$.", "input_spec": "The only line contains two integers $$$n$$$ and $$$k$$$ ($$$2 \\le n \\le 250$$$; $$$1 \\le k \\le 250$$$).", "output_spec": "Print one integer\u00a0\u2014 the number of complete beautiful graphs having exactly $$$n$$$ vertices and the weights of edges from $$$1$$$ to $$$k$$$. Since the answer might be large, print it modulo $$$998244353$$$.", "sample_inputs": ["3 2", "4 4", "6 9", "42 13"], "sample_outputs": ["5", "571", "310640163", "136246935"], "notes": null}, "src_uid": "b2d7ac8e75cbdb828067aeafd803ac62"}
{"nl": {"description": "Seryozha conducts a course dedicated to building a map of heights of Stepanovo recreation center. He laid a rectangle grid of size $$$n \\times m$$$ cells on a map (rows of grid are numbered from $$$1$$$ to $$$n$$$ from north to south, and columns are numbered from $$$1$$$ to $$$m$$$ from west to east). After that he measured the average height of each cell above Rybinsk sea level and obtained a matrix of heights of size $$$n \\times m$$$. The cell $$$(i, j)$$$ lies on the intersection of the $$$i$$$-th row and the $$$j$$$-th column and has height $$$h_{i, j}$$$. Seryozha is going to look at the result of his work in the browser. The screen of Seryozha's laptop can fit a subrectangle of size $$$a \\times b$$$ of matrix of heights ($$$1 \\le a \\le n$$$, $$$1 \\le b \\le m$$$). Seryozha tries to decide how the weather can affect the recreation center \u2014 for example, if it rains, where all the rainwater will gather. To do so, he is going to find the cell having minimum height among all cells that are shown on the screen of his laptop.Help Seryozha to calculate the sum of heights of such cells for all possible subrectangles he can see on his screen. In other words, you have to calculate the sum of minimum heights in submatrices of size $$$a \\times b$$$ with top left corners in $$$(i, j)$$$ over all $$$1 \\le i \\le n - a + 1$$$ and $$$1 \\le j \\le m - b + 1$$$.Consider the sequence $$$g_i = (g_{i - 1} \\cdot x + y) \\bmod z$$$. You are given integers $$$g_0$$$, $$$x$$$, $$$y$$$ and $$$z$$$. By miraculous coincidence, $$$h_{i, j} = g_{(i - 1) \\cdot m + j - 1}$$$ ($$$(i - 1) \\cdot m + j - 1$$$ is the index).", "input_spec": "The first line of the input contains four integers $$$n$$$, $$$m$$$, $$$a$$$ and $$$b$$$ ($$$1 \\le n, m \\le 3\\,000$$$, $$$1 \\le a \\le n$$$, $$$1 \\le b \\le m$$$) \u2014 the number of rows and columns in the matrix Seryozha has, and the number of rows and columns that can be shown on the screen of the laptop, respectively. The second line of the input contains four integers $$$g_0$$$, $$$x$$$, $$$y$$$ and $$$z$$$ ($$$0 \\le g_0, x, y < z \\le 10^9$$$).", "output_spec": "Print a single integer \u2014 the answer to the problem.", "sample_inputs": ["3 4 2 1\n1 2 3 59"], "sample_outputs": ["111"], "notes": "NoteThe matrix from the first example:   "}, "src_uid": "4618fbffb2b9d321a6d22c11590a4773"}
{"nl": {"description": "Polycarpus plays with red and blue marbles. He put n marbles from the left to the right in a row. As it turned out, the marbles form a zebroid.A non-empty sequence of red and blue marbles is a zebroid, if the colors of the marbles in this sequence alternate. For example, sequences (red; blue; red) and (blue) are zebroids and sequence (red; red) is not a zebroid.Now Polycarpus wonders, how many ways there are to pick a zebroid subsequence from this sequence. Help him solve the problem, find the number of ways modulo 1000000007 (109\u2009+\u20097).", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009106) \u2014 the number of marbles in Polycarpus's sequence.", "output_spec": "Print a single number \u2014 the answer to the problem modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["3", "4"], "sample_outputs": ["6", "11"], "notes": "NoteLet's consider the first test sample. Let's assume that Polycarpus initially had sequence (red; blue; red), so there are six ways to pick a zebroid:   pick the first marble;  pick the second marble;  pick the third marble;  pick the first and second marbles;  pick the second and third marbles;  pick the first, second and third marbles. It can be proven that if Polycarpus picks (blue; red; blue) as the initial sequence, the number of ways won't change."}, "src_uid": "5c4bd12df3915186a7b506c2060db125"}
{"nl": {"description": "You are given a permutation p of numbers 1,\u20092,\u2009...,\u2009n. Let's define f(p) as the following sum:Find the lexicographically m-th permutation of length n in the set of permutations having the maximum possible value of f(p).", "input_spec": "The single line of input contains two integers n and m (1\u2009\u2264\u2009m\u2009\u2264\u2009cntn), where cntn is the number of permutations of length n with maximum possible value of f(p). The problem consists of two subproblems. The subproblems have different constraints on the input. You will get some score for the correct submission of the subproblem. The description of the subproblems follows.   In subproblem B1 (3 points), the constraint 1\u2009\u2264\u2009n\u2009\u2264\u20098 will hold.  In subproblem B2 (4 points), the constraint 1\u2009\u2264\u2009n\u2009\u2264\u200950 will hold. ", "output_spec": "Output n number forming the required permutation.", "sample_inputs": ["2 2", "3 2"], "sample_outputs": ["2 1", "1 3 2"], "notes": "NoteIn the first example, both permutations of numbers {1, 2} yield maximum possible f(p) which is equal to 4. Among them, (2,\u20091) comes second in lexicographical order."}, "src_uid": "a8da7cbd9ddaec8e0468c6cce884e7a2"}
{"nl": {"description": "Mr. Chanek wants to knit a batik, a traditional cloth from Indonesia. The cloth forms a grid $$$a$$$ with size $$$n \\times m$$$. There are $$$k$$$ colors, and each cell in the grid can be one of the $$$k$$$ colors.Define a sub-rectangle as an ordered pair of two cells $$$((x_1, y_1), (x_2, y_2))$$$, denoting the top-left cell and bottom-right cell (inclusively) of a sub-rectangle in $$$a$$$. Two sub-rectangles $$$((x_1, y_1), (x_2, y_2))$$$ and $$$((x_3, y_3), (x_4, y_4))$$$ have the same pattern if and only if the following holds:   they have the same width ($$$x_2 - x_1 = x_4 - x_3$$$);  they have the same height ($$$y_2 - y_1 = y_4 - y_3$$$);  for every pair $$$(i, j)$$$ where $$$0 \\leq i \\leq x_2 - x_1$$$ and $$$0 \\leq j \\leq y_2 - y_1$$$, the color of cells $$$(x_1 + i, y_1 + j)$$$ and $$$(x_3 + i, y_3 + j)$$$ are equal. Count the number of possible batik color combinations, such that the subrectangles $$$((a_x, a_y),(a_x + r - 1, a_y + c - 1))$$$ and $$$((b_x, b_y),(b_x + r - 1, b_y + c - 1))$$$ have the same pattern.Output the answer modulo $$$10^9 + 7$$$.", "input_spec": "The first line contains five integers $$$n$$$, $$$m$$$, $$$k$$$, $$$r$$$, and $$$c$$$ ($$$1 \\leq n, m \\leq 10^9$$$, $$$1 \\leq k \\leq 10^9$$$, $$$1 \\leq r \\leq \\min(10^6, n)$$$, $$$1 \\leq c \\leq \\min(10^6, m)$$$) \u2014 the size of the batik, the number of colors, and size of the sub-rectangle. The second line contains four integers $$$a_x$$$, $$$a_y$$$, $$$b_x$$$, and $$$b_y$$$ ($$$1 \\leq a_x, b_x \\leq n$$$, $$$1 \\leq a_y, b_y \\leq m$$$) \u2014 the top-left corners of the first and second sub-rectangle. Both of the sub-rectangles given are inside the grid ($$$1 \\leq a_x + r - 1$$$, $$$b_x + r - 1 \\leq n$$$, $$$1 \\leq a_y + c - 1$$$, $$$b_y + c - 1 \\leq m$$$).", "output_spec": "Output an integer denoting the number of possible batik color combinations modulo $$$10^9 + 7$$$.", "sample_inputs": ["3 3 2 2 2\n1 1 2 2", "4 5 170845 2 2\n1 4 3 1"], "sample_outputs": ["32", "756680455"], "notes": "NoteThe following are all $$$32$$$ possible color combinations in the first example.  "}, "src_uid": "3478e6a4ff2415508fd517413d40c13a"}
{"nl": {"description": "Bomboslav likes to look out of the window in his room and watch lads outside playing famous shell game. The game is played by two persons: operator and player. Operator takes three similar opaque shells and places a ball beneath one of them. Then he shuffles the shells by swapping some pairs and the player has to guess the current position of the ball.Bomboslav noticed that guys are not very inventive, so the operator always swaps the left shell with the middle one during odd moves (first, third, fifth, etc.) and always swaps the middle shell with the right one during even moves (second, fourth, etc.).Let's number shells from 0 to 2 from left to right. Thus the left shell is assigned number 0, the middle shell is 1 and the right shell is 2. Bomboslav has missed the moment when the ball was placed beneath the shell, but he knows that exactly n movements were made by the operator and the ball was under shell x at the end. Now he wonders, what was the initial position of the ball?", "input_spec": "The first line of the input contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u20092\u00b7109)\u00a0\u2014 the number of movements made by the operator. The second line contains a single integer x (0\u2009\u2264\u2009x\u2009\u2264\u20092)\u00a0\u2014 the index of the shell where the ball was found after n movements.", "output_spec": "Print one integer from 0 to 2\u00a0\u2014 the index of the shell where the ball was initially placed.", "sample_inputs": ["4\n2", "1\n1"], "sample_outputs": ["1", "0"], "notes": "NoteIn the first sample, the ball was initially placed beneath the middle shell and the operator completed four movements.  During the first move operator swapped the left shell and the middle shell. The ball is now under the left shell.  During the second move operator swapped the middle shell and the right one. The ball is still under the left shell.  During the third move operator swapped the left shell and the middle shell again. The ball is again in the middle.  Finally, the operators swapped the middle shell and the right shell. The ball is now beneath the right shell. "}, "src_uid": "7853e03d520cd71571a6079cdfc4c4b0"}
{"nl": {"description": "During the winter holidays, the demand for Christmas balls is exceptionally high. Since it's already 2018, the advances in alchemy allow easy and efficient ball creation by utilizing magic crystals.Grisha needs to obtain some yellow, green and blue balls. It's known that to produce a yellow ball one needs two yellow crystals, green\u00a0\u2014 one yellow and one blue, and for a blue ball, three blue crystals are enough.Right now there are A yellow and B blue crystals in Grisha's disposal. Find out how many additional crystals he should acquire in order to produce the required number of balls.", "input_spec": "The first line features two integers A and B (0\u2009\u2264\u2009A,\u2009B\u2009\u2264\u2009109), denoting the number of yellow and blue crystals respectively at Grisha's disposal. The next line contains three integers x, y and z (0\u2009\u2264\u2009x,\u2009y,\u2009z\u2009\u2264\u2009109)\u00a0\u2014 the respective amounts of yellow, green and blue balls to be obtained.", "output_spec": "Print a single integer\u00a0\u2014 the minimum number of crystals that Grisha should acquire in addition.", "sample_inputs": ["4 3\n2 1 1", "3 9\n1 1 3", "12345678 87654321\n43043751 1000000000 53798715"], "sample_outputs": ["2", "1", "2147483648"], "notes": "NoteIn the first sample case, Grisha needs five yellow and four blue crystals to create two yellow balls, one green ball, and one blue ball. To do that, Grisha needs to obtain two additional crystals: one yellow and one blue."}, "src_uid": "35202a4601a03d25e18dda1539c5beba"}
{"nl": {"description": "One Martian boy called Zorg wants to present a string of beads to his friend from the Earth \u2014 Masha. He knows that Masha likes two colours: blue and red, \u2014 and right in the shop where he has come, there is a variety of adornments with beads of these two colours. All the strings of beads have a small fastener, and if one unfastens it, one might notice that all the strings of beads in the shop are of the same length. Because of the peculiarities of the Martian eyesight, if Zorg sees one blue-and-red string of beads first, and then the other with red beads instead of blue ones, and blue \u2014 instead of red, he regards these two strings of beads as identical. In other words, Zorg regards as identical not only those strings of beads that can be derived from each other by the string turnover, but as well those that can be derived from each other by a mutual replacement of colours and/or by the string turnover.It is known that all Martians are very orderly, and if a Martian sees some amount of objects, he tries to put them in good order. Zorg thinks that a red bead is smaller than a blue one. Let's put 0 for a red bead, and 1 \u2014 for a blue one. From two strings the Martian puts earlier the string with a red bead in the i-th position, providing that the second string has a blue bead in the i-th position, and the first two beads i\u2009-\u20091 are identical.At first Zorg unfastens all the strings of beads, and puts them into small heaps so, that in each heap strings are identical, in his opinion. Then he sorts out the heaps and chooses the minimum string in each heap, in his opinion. He gives the unnecassary strings back to the shop assistant and says he doesn't need them any more. Then Zorg sorts out the remaining strings of beads and buys the string with index k. All these manupulations will take Zorg a lot of time, that's why he asks you to help and find the string of beads for Masha.", "input_spec": "The input file contains two integers n and k (2\u2009\u2264\u2009n\u2009\u2264\u200950;1\u2009\u2264\u2009k\u2009\u2264\u20091016) \u2014the length of a string of beads, and the index of the string, chosen by Zorg. ", "output_spec": "Output the k-th string of beads, putting 0 for a red bead, and 1 \u2014 for a blue one. If it s impossible to find the required string, output the only number -1.", "sample_inputs": ["4 4"], "sample_outputs": ["0101"], "notes": "NoteLet's consider the example of strings of length 4 \u2014 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110. Zorg will divide them into heaps: {0001, 0111, 1000, 1110}, {0010, 0100, 1011, 1101}, {0011, 1100}, {0101, 1010}, {0110, 1001}. Then he will choose the minimum strings of beads in each heap: 0001, 0010, 0011, 0101, 0110. The forth string \u2014 0101."}, "src_uid": "0a4a418dafaee71f1b31c928fc2ad24a"}
{"nl": {"description": "You have an initially empty cauldron, and you want to brew a potion in it. The potion consists of two ingredients: magic essence and water. The potion you want to brew should contain exactly $$$k\\ \\%$$$ magic essence and $$$(100 - k)\\ \\%$$$ water.In one step, you can pour either one liter of magic essence or one liter of water into the cauldron. What is the minimum number of steps to brew a potion? You don't care about the total volume of the potion, only about the ratio between magic essence and water in it.A small reminder: if you pour $$$e$$$ liters of essence and $$$w$$$ liters of water ($$$e + w > 0$$$) into the cauldron, then it contains $$$\\frac{e}{e + w} \\cdot 100\\ \\%$$$ (without rounding) magic essence and $$$\\frac{w}{e + w} \\cdot 100\\ \\%$$$ water.", "input_spec": "The first line contains the single $$$t$$$ ($$$1 \\le t \\le 100$$$)\u00a0\u2014 the number of test cases. The first and only line of each test case contains a single integer $$$k$$$ ($$$1 \\le k \\le 100$$$)\u00a0\u2014 the percentage of essence in a good potion.", "output_spec": "For each test case, print the minimum number of steps to brew a good potion. It can be proved that it's always possible to achieve it in a finite number of steps.", "sample_inputs": ["3\n3\n100\n25"], "sample_outputs": ["100\n1\n4"], "notes": "NoteIn the first test case, you should pour $$$3$$$ liters of magic essence and $$$97$$$ liters of water into the cauldron to get a potion with $$$3\\ \\%$$$ of magic essence.In the second test case, you can pour only $$$1$$$ liter of essence to get a potion with $$$100\\ \\%$$$ of magic essence.In the third test case, you can pour $$$1$$$ liter of magic essence and $$$3$$$ liters of water."}, "src_uid": "19a2bcb727510c729efe442a13c2ff7c"}
{"nl": {"description": "You are given a string s consisting of |s| small english letters.In one move you can replace any character of this string to the next character in alphabetical order (a will be replaced with b, s will be replaced with t, etc.). You cannot replace letter z with any other letter.Your target is to make some number of moves (not necessary minimal) to get string abcdefghijklmnopqrstuvwxyz (english alphabet) as a subsequence. Subsequence of the string is the string that is obtained by deleting characters at some positions. You need to print the string that will be obtained from the given string and will be contain english alphabet as a subsequence or say that it is impossible.", "input_spec": "The only one line of the input consisting of the string s consisting of |s| (1\u2009\u2264\u2009|s|\u2009\u2264\u2009105) small english letters.", "output_spec": "If you can get a string that can be obtained from the given string and will contain english alphabet as a subsequence, print it. Otherwise print \u00ab-1\u00bb (without quotes).", "sample_inputs": ["aacceeggiikkmmooqqssuuwwyy", "thereisnoanswer"], "sample_outputs": ["abcdefghijklmnopqrstuvwxyz", "-1"], "notes": null}, "src_uid": "f8ad543d499bcc0da0121a71a26db854"}
{"nl": {"description": "There are a lot of things which could be cut\u00a0\u2014 trees, paper, \"the rope\". In this problem you are going to cut a sequence of integers.There is a sequence of integers, which contains the equal number of even and odd numbers. Given a limited budget, you need to make maximum possible number of cuts such that each resulting segment will have the same number of odd and even integers.Cuts separate a sequence to continuous (contiguous) segments. You may think about each cut as a break between two adjacent elements in a sequence. So after cutting each element belongs to exactly one segment. Say, $$$[4, 1, 2, 3, 4, 5, 4, 4, 5, 5]$$$ $$$\\to$$$ two cuts $$$\\to$$$ $$$[4, 1 | 2, 3, 4, 5 | 4, 4, 5, 5]$$$. On each segment the number of even elements should be equal to the number of odd elements.The cost of the cut between $$$x$$$ and $$$y$$$ numbers is $$$|x - y|$$$ bitcoins. Find the maximum possible number of cuts that can be made while spending no more than $$$B$$$ bitcoins.", "input_spec": "First line of the input contains an integer $$$n$$$ ($$$2 \\le n \\le 100$$$) and an integer $$$B$$$ ($$$1 \\le B \\le 100$$$)\u00a0\u2014 the number of elements in the sequence and the number of bitcoins you have. Second line contains $$$n$$$ integers: $$$a_1$$$, $$$a_2$$$, ..., $$$a_n$$$ ($$$1 \\le a_i \\le 100$$$)\u00a0\u2014 elements of the sequence, which contains the equal number of even and odd numbers", "output_spec": "Print the maximum possible number of cuts which can be made while spending no more than $$$B$$$ bitcoins.", "sample_inputs": ["6 4\n1 2 5 10 15 20", "4 10\n1 3 2 4", "6 100\n1 2 3 4 5 6"], "sample_outputs": ["1", "0", "2"], "notes": "NoteIn the first sample the optimal answer is to split sequence between $$$2$$$ and $$$5$$$. Price of this cut is equal to $$$3$$$ bitcoins.In the second sample it is not possible to make even one cut even with unlimited number of bitcoins.In the third sample the sequence should be cut between $$$2$$$ and $$$3$$$, and between $$$4$$$ and $$$5$$$. The total price of the cuts is $$$1 + 1 = 2$$$ bitcoins."}, "src_uid": "b3f8e769ee7719ea5c9f458428b16a4e"}
{"nl": {"description": "Karl likes Codeforces and subsequences. He wants to find a string of lowercase English letters that contains at least $$$k$$$ subsequences codeforces. Out of all possible strings, Karl wants to find a shortest one.Formally, a codeforces subsequence of a string $$$s$$$ is a subset of ten characters of $$$s$$$ that read codeforces from left to right. For example, codeforces contains codeforces a single time, while codeforcesisawesome contains codeforces four times: codeforcesisawesome, codeforcesisawesome, codeforcesisawesome, codeforcesisawesome.Help Karl find any shortest string that contains at least $$$k$$$ codeforces subsequences.", "input_spec": "The only line contains a single integer $$$k$$$ ($$$1 \\leq k \\leq 10^{16})$$$.", "output_spec": "Print a shortest string of lowercase English letters that contains at least $$$k$$$ codeforces subsequences. If there are several such strings, print any of them.", "sample_inputs": ["1", "3"], "sample_outputs": ["codeforces", "codeforcesss"], "notes": null}, "src_uid": "8001a7570766cadcc538217e941b3031"}
{"nl": {"description": "Vasily the Programmer loves romance, so this year he decided to illuminate his room with candles.Vasily has a candles.When Vasily lights up a new candle, it first burns for an hour and then it goes out. Vasily is smart, so he can make b went out candles into a new candle. As a result, this new candle can be used like any other new candle.Now Vasily wonders: for how many hours can his candles light up the room if he acts optimally well? Help him find this number.", "input_spec": "The single line contains two integers, a and b (1\u2009\u2264\u2009a\u2009\u2264\u20091000;\u00a02\u2009\u2264\u2009b\u2009\u2264\u20091000).", "output_spec": "Print a single integer \u2014 the number of hours Vasily can light up the room for.", "sample_inputs": ["4 2", "6 3"], "sample_outputs": ["7", "8"], "notes": "NoteConsider the first sample. For the first four hours Vasily lights up new candles, then he uses four burned out candles to make two new ones and lights them up. When these candles go out (stop burning), Vasily can make another candle. Overall, Vasily can light up the room for 7 hours."}, "src_uid": "a349094584d3fdc6b61e39bffe96dece"}
{"nl": {"description": "The Smart Beaver from ABBYY decided to have a day off. But doing nothing the whole day turned out to be too boring, and he decided to play a game with pebbles. Initially, the Beaver has n pebbles. He arranges them in a equal rows, each row has b pebbles (a\u2009>\u20091). Note that the Beaver must use all the pebbles he has, i. e. n\u2009=\u2009a\u00b7b.   10 pebbles are arranged in two rows, each row has 5 pebbles  Once the Smart Beaver has arranged the pebbles, he takes back any of the resulting rows (that is, b pebbles) and discards all other pebbles. Then he arranges all his pebbles again (possibly choosing other values of a and b) and takes back one row, and so on. The game continues until at some point the Beaver ends up with exactly one pebble. The game process can be represented as a finite sequence of integers c1,\u2009...,\u2009ck, where:   c1\u2009=\u2009n  ci\u2009+\u20091 is the number of pebbles that the Beaver ends up with after the i-th move, that is, the number of pebbles in a row after some arrangement of ci pebbles (1\u2009\u2264\u2009i\u2009<\u2009k). Note that ci\u2009>\u2009ci\u2009+\u20091.  ck\u2009=\u20091 The result of the game is the sum of numbers ci. You are given n. Find the maximum possible result of the game.", "input_spec": "The single line of the input contains a single integer n \u2014 the initial number of pebbles the Smart Beaver has. The input limitations for getting 30 points are:    2\u2009\u2264\u2009n\u2009\u2264\u200950  The input limitations for getting 100 points are:    2\u2009\u2264\u2009n\u2009\u2264\u2009109 ", "output_spec": "Print a single number \u2014 the maximum possible result of the game.", "sample_inputs": ["10", "8"], "sample_outputs": ["16", "15"], "notes": "NoteConsider the first example (c1\u2009=\u200910). The possible options for the game development are:  Arrange the pebbles in 10 rows, one pebble per row. Then c2\u2009=\u20091, and the game ends after the first move with the result of 11.  Arrange the pebbles in 5 rows, two pebbles per row. Then c2\u2009=\u20092, and the game continues. During the second move we have two pebbles which can be arranged in a unique way (remember that you are not allowed to put all the pebbles in the same row!) \u2014 2 rows, one pebble per row. c3\u2009=\u20091, and the game ends with the result of 13.  Finally, arrange the pebbles in two rows, five pebbles per row. The same logic leads us to c2\u2009=\u20095,\u2009c3\u2009=\u20091, and the game ends with the result of 16 \u2014 the maximum possible result. "}, "src_uid": "821c0e3b5fad197a47878bba5e520b6e"}
{"nl": {"description": "Once upon a time in the Kingdom of Far Far Away lived Sam the Farmer. Sam had a cow named Dawn and he was deeply attached to her. Sam would spend the whole summer stocking hay to feed Dawn in winter. Sam scythed hay and put it into haystack. As Sam was a bright farmer, he tried to make the process of storing hay simpler and more convenient to use. He collected the hay into cubical hay blocks of the same size. Then he stored the blocks in his barn. After a summer spent in hard toil Sam stored A\u00b7B\u00b7C hay blocks and stored them in a barn as a rectangular parallelepiped A layers high. Each layer had B rows and each row had C blocks.At the end of the autumn Sam came into the barn to admire one more time the hay he'd been stacking during this hard summer. Unfortunately, Sam was horrified to see that the hay blocks had been carelessly scattered around the barn. The place was a complete mess. As it turned out, thieves had sneaked into the barn. They completely dissembled and took away a layer of blocks from the parallelepiped's front, back, top and sides. As a result, the barn only had a parallelepiped containing (A\u2009-\u20091)\u2009\u00d7\u2009(B\u2009-\u20092)\u2009\u00d7\u2009(C\u2009-\u20092) hay blocks. To hide the evidence of the crime, the thieves had dissembled the parallelepiped into single 1\u2009\u00d7\u20091\u2009\u00d7\u20091 blocks and scattered them around the barn. After the theft Sam counted n hay blocks in the barn but he forgot numbers A, B \u0438 C.Given number n, find the minimally possible and maximally possible number of stolen hay blocks.", "input_spec": "The only line contains integer n from the problem's statement (1\u2009\u2264\u2009n\u2009\u2264\u2009109).", "output_spec": "Print space-separated minimum and maximum number of hay blocks that could have been stolen by the thieves. Note that the answer to the problem can be large enough, so you must use the 64-bit integer type for calculations. Please, do not use the %lld specificator to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specificator.", "sample_inputs": ["4", "7", "12"], "sample_outputs": ["28 41", "47 65", "48 105"], "notes": "NoteLet's consider the first sample test. If initially Sam has a parallelepiped consisting of 32\u2009=\u20092\u2009\u00d7\u20094\u2009\u00d7\u20094 hay blocks in his barn, then after the theft the barn has 4\u2009=\u2009(2\u2009-\u20091)\u2009\u00d7\u2009(4\u2009-\u20092)\u2009\u00d7\u2009(4\u2009-\u20092) hay blocks left. Thus, the thieves could have stolen 32\u2009-\u20094\u2009=\u200928 hay blocks. If Sam initially had a parallelepiped consisting of 45\u2009=\u20095\u2009\u00d7\u20093\u2009\u00d7\u20093 hay blocks in his barn, then after the theft the barn has 4\u2009=\u2009(5\u2009-\u20091)\u2009\u00d7\u2009(3\u2009-\u20092)\u2009\u00d7\u2009(3\u2009-\u20092) hay blocks left. Thus, the thieves could have stolen 45\u2009-\u20094\u2009=\u200941 hay blocks. No other variants of the blocks' initial arrangement (that leave Sam with exactly 4 blocks after the theft) can permit the thieves to steal less than 28 or more than 41 blocks."}, "src_uid": "2468eead8acc5b8f5ddc51bfa2bd4fb7"}
{"nl": {"description": "The main street of Berland is a straight line with n houses built along it (n is an even number). The houses are located at both sides of the street. The houses with odd numbers are at one side of the street and are numbered from 1 to n\u2009-\u20091 in the order from the beginning of the street to the end (in the picture: from left to right). The houses with even numbers are at the other side of the street and are numbered from 2 to n in the order from the end of the street to its beginning (in the picture: from right to left). The corresponding houses with even and odd numbers are strictly opposite each other, that is, house 1 is opposite house n, house 3 is opposite house n\u2009-\u20092, house 5 is opposite house n\u2009-\u20094 and so on.  Vasya needs to get to house number a as quickly as possible. He starts driving from the beginning of the street and drives his car to house a. To get from the beginning of the street to houses number 1 and n, he spends exactly 1 second. He also spends exactly one second to drive the distance between two neighbouring houses. Vasya can park at any side of the road, so the distance between the beginning of the street at the houses that stand opposite one another should be considered the same.Your task is: find the minimum time Vasya needs to reach house a.", "input_spec": "The first line of the input contains two integers, n and a (1\u2009\u2264\u2009a\u2009\u2264\u2009n\u2009\u2264\u2009100\u2009000)\u00a0\u2014 the number of houses on the street and the number of the house that Vasya needs to reach, correspondingly. It is guaranteed that number n is even.", "output_spec": "Print a single integer \u2014 the minimum time Vasya needs to get from the beginning of the street to house a.", "sample_inputs": ["4 2", "8 5"], "sample_outputs": ["2", "3"], "notes": "NoteIn the first sample there are only four houses on the street, two houses at each side. House 2 will be the last at Vasya's right.The second sample corresponds to picture with n\u2009=\u20098. House 5 is the one before last at Vasya's left."}, "src_uid": "aa62dcdc47d0abbba7956284c1561de8"}
{"nl": {"description": "Count the number of distinct sequences a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai) consisting of positive integers such that gcd(a1,\u2009a2,\u2009...,\u2009an)\u2009=\u2009x and . As this number could be large, print the answer modulo 109\u2009+\u20097.gcd here means the greatest common divisor.", "input_spec": "The only line contains two positive integers x and y (1\u2009\u2264\u2009x,\u2009y\u2009\u2264\u2009109).", "output_spec": "Print the number of such sequences modulo 109\u2009+\u20097.", "sample_inputs": ["3 9", "5 8"], "sample_outputs": ["3", "0"], "notes": "NoteThere are three suitable sequences in the first test: (3,\u20093,\u20093), (3,\u20096), (6,\u20093).There are no suitable sequences in the second test."}, "src_uid": "de7731ce03735b962ee033613192f7bc"}
{"nl": {"description": "Integers from $$$1$$$ to $$$n$$$ (inclusive) were sorted lexicographically (considering integers as strings). As a result, array $$$a_1, a_2, \\dots, a_n$$$ was obtained.Calculate value of $$$(\\sum_{i = 1}^n ((i - a_i) \\mod 998244353)) \\mod 10^9 + 7$$$.$$$x \\mod y$$$ here means the remainder after division $$$x$$$ by $$$y$$$. This remainder is always non-negative and doesn't exceed $$$y - 1$$$. For example, $$$5 \\mod 3 = 2$$$, $$$(-1) \\mod 6 = 5$$$. ", "input_spec": "The first line contains the single integer $$$n$$$ ($$$1 \\leq n \\leq 10^{12}$$$).", "output_spec": "Print one integer\u00a0\u2014 the required sum.", "sample_inputs": ["3", "12", "21", "1000000000000"], "sample_outputs": ["0", "994733045", "978932159", "289817887"], "notes": "NoteA string $$$a$$$ is lexicographically smaller than a string $$$b$$$ if and only if one of the following holds:  $$$a$$$ is a prefix of $$$b$$$, but $$$a \\ne b$$$;  in the first position where $$$a$$$ and $$$b$$$ differ, the string $$$a$$$ has a letter that appears earlier in the alphabet than the corresponding letter in $$$b$$$. For example, $$$42$$$ is lexicographically smaller than $$$6$$$, because they differ in the first digit, and $$$4 < 6$$$; $$$42 < 420$$$, because $$$42$$$ is a prefix of $$$420$$$.Let's denote $$$998244353$$$ as $$$M$$$.In the first example, array $$$a$$$ is equal to $$$[1, 2, 3]$$$.   $$$(1 - 1) \\mod M = 0 \\mod M = 0$$$  $$$(2 - 2) \\mod M = 0 \\mod M = 0$$$  $$$(3 - 3) \\mod M = 0 \\mod M = 0$$$ As a result, $$$(0 + 0 + 0) \\mod 10^9 + 7 = 0$$$In the second example, array $$$a$$$ is equal to $$$[1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9]$$$.   $$$(1 - 1) \\mod M = 0 \\mod M = 0$$$  $$$(2 - 10) \\mod M = (-8) \\mod M = 998244345$$$  $$$(3 - 11) \\mod M = (-8) \\mod M = 998244345$$$  $$$(4 - 12) \\mod M = (-8) \\mod M = 998244345$$$  $$$(5 - 2) \\mod M = 3 \\mod M = 3$$$  $$$(6 - 3) \\mod M = 3 \\mod M = 3$$$  $$$(7 - 4) \\mod M = 3 \\mod M = 3$$$  $$$(8 - 5) \\mod M = 3 \\mod M = 3$$$  $$$(9 - 6) \\mod M = 3 \\mod M = 3$$$  $$$(10 - 7) \\mod M = 3 \\mod M = 3$$$  $$$(11 - 8) \\mod M = 3 \\mod M = 3$$$  $$$(12 - 9) \\mod M = 3 \\mod M = 3$$$ As a result, $$$(0 + 998244345 + 998244345 + 998244345 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3) \\mod 10^9 + 7$$$ $$$=$$$ $$$2994733059 \\mod 10^9 + 7$$$ $$$=$$$ $$$994733045$$$"}, "src_uid": "2c70ae38f91ab739621a31b897b8fbf3"}
{"nl": {"description": "Vova, the Ultimate Thule new shaman, wants to build a pipeline. As there are exactly n houses in Ultimate Thule, Vova wants the city to have exactly n pipes, each such pipe should be connected to the water supply. A pipe can be connected to the water supply if there's water flowing out of it. Initially Vova has only one pipe with flowing water. Besides, Vova has several splitters.A splitter is a construction that consists of one input (it can be connected to a water pipe) and x output pipes. When a splitter is connected to a water pipe, water flows from each output pipe. You can assume that the output pipes are ordinary pipes. For example, you can connect water supply to such pipe if there's water flowing out from it. At most one splitter can be connected to any water pipe.  The figure shows a 4-output splitter Vova has one splitter of each kind: with 2, 3, 4, ..., k outputs. Help Vova use the minimum number of splitters to build the required pipeline or otherwise state that it's impossible.Vova needs the pipeline to have exactly n pipes with flowing out water. Note that some of those pipes can be the output pipes of the splitters.", "input_spec": "The first line contains two space-separated integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u20091018, 2\u2009\u2264\u2009k\u2009\u2264\u2009109). Please, do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "Print a single integer \u2014 the minimum number of splitters needed to build the pipeline. If it is impossible to build a pipeline with the given splitters, print -1.", "sample_inputs": ["4 3", "5 5", "8 4"], "sample_outputs": ["2", "1", "-1"], "notes": null}, "src_uid": "83bcfe32db302fbae18e8a95d89cf411"}
{"nl": {"description": "Polycarp is preparing the first programming contest for robots. There are $$$n$$$ problems in it, and a lot of robots are going to participate in it. Each robot solving the problem $$$i$$$ gets $$$p_i$$$ points, and the score of each robot in the competition is calculated as the sum of $$$p_i$$$ over all problems $$$i$$$ solved by it. For each problem, $$$p_i$$$ is an integer not less than $$$1$$$.Two corporations specializing in problem-solving robot manufacturing, \"Robo-Coder Inc.\" and \"BionicSolver Industries\", are going to register two robots (one for each corporation) for participation as well. Polycarp knows the advantages and flaws of robots produced by these companies, so, for each problem, he knows precisely whether each robot will solve it during the competition. Knowing this, he can try predicting the results \u2014 or manipulating them. For some reason (which absolutely cannot involve bribing), Polycarp wants the \"Robo-Coder Inc.\" robot to outperform the \"BionicSolver Industries\" robot in the competition. Polycarp wants to set the values of $$$p_i$$$ in such a way that the \"Robo-Coder Inc.\" robot gets strictly more points than the \"BionicSolver Industries\" robot. However, if the values of $$$p_i$$$ will be large, it may look very suspicious \u2014 so Polycarp wants to minimize the maximum value of $$$p_i$$$ over all problems. Can you help Polycarp to determine the minimum possible upper bound on the number of points given for solving the problems?", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\le n \\le 100$$$) \u2014 the number of problems. The second line contains $$$n$$$ integers $$$r_1$$$, $$$r_2$$$, ..., $$$r_n$$$ ($$$0 \\le r_i \\le 1$$$). $$$r_i = 1$$$ means that the \"Robo-Coder Inc.\" robot will solve the $$$i$$$-th problem, $$$r_i = 0$$$ means that it won't solve the $$$i$$$-th problem. The third line contains $$$n$$$ integers $$$b_1$$$, $$$b_2$$$, ..., $$$b_n$$$ ($$$0 \\le b_i \\le 1$$$). $$$b_i = 1$$$ means that the \"BionicSolver Industries\" robot will solve the $$$i$$$-th problem, $$$b_i = 0$$$ means that it won't solve the $$$i$$$-th problem.", "output_spec": "If \"Robo-Coder Inc.\" robot cannot outperform the \"BionicSolver Industries\" robot by any means, print one integer $$$-1$$$. Otherwise, print the minimum possible value of $$$\\max \\limits_{i = 1}^{n} p_i$$$, if all values of $$$p_i$$$ are set in such a way that the \"Robo-Coder Inc.\" robot gets strictly more points than the \"BionicSolver Industries\" robot.", "sample_inputs": ["5\n1 1 1 0 0\n0 1 1 1 1", "3\n0 0 0\n0 0 0", "4\n1 1 1 1\n1 1 1 1", "8\n1 0 0 0 0 0 0 0\n0 1 1 0 1 1 1 1"], "sample_outputs": ["3", "-1", "-1", "7"], "notes": "NoteIn the first example, one of the valid score assignments is $$$p = [3, 1, 3, 1, 1]$$$. Then the \"Robo-Coder\" gets $$$7$$$ points, the \"BionicSolver\" \u2014 $$$6$$$ points.In the second example, both robots get $$$0$$$ points, and the score distribution does not matter.In the third example, both robots solve all problems, so their points are equal."}, "src_uid": "b62338bff0cbb4df4e5e27e1a3ffaa07"}
{"nl": {"description": "It is known that passages in Singer house are complex and intertwined. Let's define a Singer k-house as a graph built by the following process: take complete binary tree of height k and add edges from each vertex to all its successors, if they are not yet present.  Singer 4-house Count the number of non-empty paths in Singer k-house which do not pass the same vertex twice. Two paths are distinct if the sets or the orders of visited vertices are different. Since the answer can be large, output it modulo 109\u2009+\u20097.", "input_spec": "The only line contains single integer k (1\u2009\u2264\u2009k\u2009\u2264\u2009400).", "output_spec": "Print single integer\u00a0\u2014 the answer for the task modulo 109\u2009+\u20097.", "sample_inputs": ["2", "3", "20"], "sample_outputs": ["9", "245", "550384565"], "notes": "NoteThere are 9 paths in the first example (the vertices are numbered on the picture below): 1, 2, 3, 1-2, 2-1, 1-3, 3-1, 2-1-3, 3-1-2.  Singer 2-house "}, "src_uid": "fda761834f7b5800f540178ac1c79fca"}
{"nl": {"description": "You are given an array of $$$n$$$ integers: $$$a_1, a_2, \\ldots, a_n$$$. Your task is to find some non-zero integer $$$d$$$ ($$$-10^3 \\leq d \\leq 10^3$$$) such that, after each number in the array is divided by $$$d$$$, the number of positive numbers that are presented in the array is greater than or equal to half of the array size (i.e., at least $$$\\lceil\\frac{n}{2}\\rceil$$$). Note that those positive numbers do not need to be an integer (e.g., a $$$2.5$$$ counts as a positive number). If there are multiple values of $$$d$$$ that satisfy the condition, you may print any of them. In case that there is no such $$$d$$$, print a single integer $$$0$$$.Recall that $$$\\lceil x \\rceil$$$ represents the smallest integer that is not less than $$$x$$$ and that zero ($$$0$$$) is neither positive nor negative.", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\le n \\le 100$$$)\u00a0\u2014 the number of elements in the array. The second line contains $$$n$$$ space-separated integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$-10^3 \\le a_i \\le 10^3$$$).", "output_spec": "Print one integer $$$d$$$ ($$$-10^3 \\leq d \\leq 10^3$$$ and $$$d \\neq 0$$$) that satisfies the given condition. If there are multiple values of $$$d$$$ that satisfy the condition, you may print any of them. In case that there is no such $$$d$$$, print a single integer $$$0$$$.", "sample_inputs": ["5\n10 0 -7 2 6", "7\n0 0 1 -1 0 0 2"], "sample_outputs": ["4", "0"], "notes": "NoteIn the first sample, $$$n = 5$$$, so we need at least $$$\\lceil\\frac{5}{2}\\rceil = 3$$$ positive numbers after division. If $$$d = 4$$$, the array after division is $$$[2.5, 0, -1.75, 0.5, 1.5]$$$, in which there are $$$3$$$ positive numbers (namely: $$$2.5$$$, $$$0.5$$$, and $$$1.5$$$).In the second sample, there is no valid $$$d$$$, so $$$0$$$ should be printed."}, "src_uid": "a13cb35197f896cd34614c6c0b369a49"}
{"nl": {"description": "InputThe input contains a single integer $$$a$$$ ($$$1 \\le a \\le 99$$$).OutputOutput \"YES\" or \"NO\".ExamplesInput\n5\nOutput\nYES\nInput\n13\nOutput\nNO\nInput\n24\nOutput\nNO\nInput\n46\nOutput\nYES\n", "input_spec": "The input contains a single integer $$$a$$$ ($$$1 \\le a \\le 99$$$).", "output_spec": "Output \"YES\" or \"NO\".", "sample_inputs": ["5", "13", "24", "46"], "sample_outputs": ["YES", "NO", "NO", "YES"], "notes": null}, "src_uid": "821529a4644b74483bcdf80fc318d1f8"}
{"nl": {"description": "Masha has three sticks of length $$$a$$$, $$$b$$$ and $$$c$$$ centimeters respectively. In one minute Masha can pick one arbitrary stick and increase its length by one centimeter. She is not allowed to break sticks.What is the minimum number of minutes she needs to spend increasing the stick's length in order to be able to assemble a triangle of positive area. Sticks should be used as triangle's sides (one stick for one side) and their endpoints should be located at triangle's vertices.", "input_spec": "The only line contains tree integers $$$a$$$, $$$b$$$ and $$$c$$$ ($$$1 \\leq a, b, c \\leq 100$$$)\u00a0\u2014 the lengths of sticks Masha possesses.", "output_spec": "Print a single integer\u00a0\u2014 the minimum number of minutes that Masha needs to spend in order to be able to make the triangle of positive area from her sticks.", "sample_inputs": ["3 4 5", "2 5 3", "100 10 10"], "sample_outputs": ["0", "1", "81"], "notes": "NoteIn the first example, Masha can make a triangle from the sticks without increasing the length of any of them.In the second example, Masha can't make a triangle of positive area from the sticks she has at the beginning, but she can spend one minute to increase the length $$$2$$$ centimeter stick by one and after that form a triangle with sides $$$3$$$, $$$3$$$ and $$$5$$$ centimeters.In the third example, Masha can take $$$33$$$ minutes to increase one of the $$$10$$$ centimeters sticks by $$$33$$$ centimeters, and after that take $$$48$$$ minutes to increase another $$$10$$$ centimeters stick by $$$48$$$ centimeters. This way she can form a triangle with lengths $$$43$$$, $$$58$$$ and $$$100$$$ centimeters in $$$81$$$ minutes. One can show that it is impossible to get a valid triangle faster."}, "src_uid": "3dc56bc08606a39dd9ca40a43c452f09"}
{"nl": {"description": "You are given set of n points in 5-dimensional space. The points are labeled from 1 to n. No two points coincide.We will call point a bad if there are different points b and c, not equal to a, from the given set such that angle between vectors  and  is acute (i.e. strictly less than ). Otherwise, the point is called good.The angle between vectors  and  in 5-dimensional space is defined as , where  is the scalar product and  is length of .Given the list of points, print the indices of the good points in ascending order.", "input_spec": "The first line of input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009103)\u00a0\u2014 the number of points. The next n lines of input contain five integers ai,\u2009bi,\u2009ci,\u2009di,\u2009ei (|ai|,\u2009|bi|,\u2009|ci|,\u2009|di|,\u2009|ei|\u2009\u2264\u2009103) \u00a0\u2014 the coordinates of the i-th point. All points are distinct.", "output_spec": "First, print a single integer k\u00a0\u2014 the number of good points. Then, print k integers, each on their own line\u00a0\u2014 the indices of the good points in ascending order.", "sample_inputs": ["6\n0 0 0 0 0\n1 0 0 0 0\n0 1 0 0 0\n0 0 1 0 0\n0 0 0 1 0\n0 0 0 0 1", "3\n0 0 1 2 0\n0 0 9 2 0\n0 0 5 9 0"], "sample_outputs": ["1\n1", "0"], "notes": "NoteIn the first sample, the first point forms exactly a  angle with all other pairs of points, so it is good.In the second sample, along the cd plane, we can see the points look as follows:We can see that all angles here are acute, so no points are good."}, "src_uid": "c1cfe1f67217afd4c3c30a6327e0add9"}
{"nl": {"description": "Once upon a time in the thicket of the mushroom forest lived mushroom gnomes. They were famous among their neighbors for their magic mushrooms. Their magic nature made it possible that between every two neighboring mushrooms every minute grew another mushroom with the weight equal to the sum of weights of two neighboring ones. The mushroom gnomes loved it when everything was in order, that's why they always planted the mushrooms in one line in the order of their weights' increasing. Well... The gnomes planted the mushrooms and went to eat. After x minutes they returned and saw that new mushrooms had grown up, so that the increasing order had been violated. The gnomes replanted all the mushrooms in the correct order, that is, they sorted the mushrooms in the order of the weights' increasing. And went to eat again (those gnomes were quite big eaters). What total weights modulo p will the mushrooms have in another y minutes?", "input_spec": "The first line contains four integers n, x, y, p (1\u2009\u2264\u2009n\u2009\u2264\u2009106,\u20090\u2009\u2264\u2009x,\u2009y\u2009\u2264\u20091018,\u2009x\u2009+\u2009y\u2009>\u20090,\u20092\u2009\u2264\u2009p\u2009\u2264\u2009109) which represent the number of mushrooms, the number of minutes after the first replanting, the number of minutes after the second replanting and the module. The next line contains n integers ai which represent the mushrooms' weight in the non-decreasing order (0\u2009\u2264\u2009ai\u2009\u2264\u2009109). Please, do not use %lld specificator to read or write 64-bit integers in C++. It is preffered to use cin (also you may use %I64d).", "output_spec": "The answer should contain a single number which is the total weights of the mushrooms modulo p in the end after x\u2009+\u2009y minutes.", "sample_inputs": ["2 1 0 657276545\n1 2", "2 1 1 888450282\n1 2", "4 5 0 10000\n1 2 3 4"], "sample_outputs": ["6", "14", "1825"], "notes": null}, "src_uid": "b5dd2b94570973b3e312ae4b7a43284f"}
{"nl": {"description": "InputThe input contains a single integer a (10\u2009\u2264\u2009a\u2009\u2264\u2009999).OutputOutput 0 or 1.ExamplesInput13Output1Input927Output1Input48Output0", "input_spec": "The input contains a single integer a (10\u2009\u2264\u2009a\u2009\u2264\u2009999).", "output_spec": "Output 0 or 1.", "sample_inputs": ["13", "927", "48"], "sample_outputs": ["1", "1", "0"], "notes": null}, "src_uid": "78e64fdbf59c5ce89d0f0a1d0591f795"}
{"nl": {"description": "zscoder has a deck of $$$n+m$$$ custom-made cards, which consists of $$$n$$$ cards labelled from $$$1$$$ to $$$n$$$ and $$$m$$$ jokers. Since zscoder is lonely, he wants to play a game with himself using those cards. Initially, the deck is shuffled uniformly randomly and placed on the table. zscoder has a set $$$S$$$ which is initially empty. Every second, zscoder draws the top card from the deck.   If the card has a number $$$x$$$ written on it, zscoder removes the card and adds $$$x$$$ to the set $$$S$$$.  If the card drawn is a joker, zscoder places all the cards back into the deck and reshuffles (uniformly randomly) the $$$n+m$$$ cards to form a new deck (hence the new deck now contains all cards from $$$1$$$ to $$$n$$$ and the $$$m$$$ jokers). Then, if $$$S$$$ currently contains all the elements from $$$1$$$ to $$$n$$$, the game ends. Shuffling the deck doesn't take time at all. What is the expected number of seconds before the game ends? We can show that the answer can be written in the form $$$\\frac{P}{Q}$$$ where $$$P, Q$$$ are relatively prime integers and $$$Q \\neq 0 \\bmod 998244353$$$. Output the value of $$$(P \\cdot Q^{-1})$$$ modulo $$$998244353$$$.", "input_spec": "The only line of the input contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n, m \\le 2 \\cdot 10^{6}$$$).", "output_spec": "Output a single integer, the value of $$$(P \\cdot Q^{-1})$$$ modulo $$$998244353$$$.", "sample_inputs": ["2 1", "3 2", "14 9"], "sample_outputs": ["5", "332748127", "969862773"], "notes": "NoteFor the first sample, it can be proven that the expected time before the game ends is $$$5$$$ seconds.For the second sample, it can be proven that the expected time before the game ends is $$$\\frac{28}{3}$$$ seconds."}, "src_uid": "9f2b59df7bef2aeee0ce71facd2b1613"}
{"nl": {"description": "There are n shovels in Polycarp's shop. The i-th shovel costs i burles, that is, the first shovel costs 1 burle, the second shovel costs 2 burles, the third shovel costs 3 burles, and so on. Polycarps wants to sell shovels in pairs.Visitors are more likely to buy a pair of shovels if their total cost ends with several 9s. Because of this, Polycarp wants to choose a pair of shovels to sell in such a way that the sum of their costs ends with maximum possible number of nines. For example, if he chooses shovels with costs 12345 and 37454, their total cost is 49799, it ends with two nines.You are to compute the number of pairs of shovels such that their total cost ends with maximum possible number of nines. Two pairs are considered different if there is a shovel presented in one pair, but not in the other.", "input_spec": "The first line contains a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009109) \u2014 the number of shovels in Polycarp's shop.", "output_spec": "Print the number of pairs of shovels such that their total cost ends with maximum possible number of nines.  Note that it is possible that the largest number of 9s at the end is 0, then you should count all such ways. It is guaranteed that for every n\u2009\u2264\u2009109 the answer doesn't exceed 2\u00b7109.", "sample_inputs": ["7", "14", "50"], "sample_outputs": ["3", "9", "1"], "notes": "NoteIn the first example the maximum possible number of nines at the end is one. Polycarp cah choose the following pairs of shovels for that purpose:  2 and 7;  3 and 6;  4 and 5. In the second example the maximum number of nines at the end of total cost of two shovels is one. The following pairs of shovels suit Polycarp:  1 and 8;  2 and 7;  3 and 6;  4 and 5;  5 and 14;  6 and 13;  7 and 12;  8 and 11;  9 and 10. In the third example it is necessary to choose shovels 49 and 50, because the sum of their cost is 99, that means that the total number of nines is equal to two, which is maximum possible for n\u2009=\u200950."}, "src_uid": "c20744c44269ae0779c5f549afd2e3f2"}
{"nl": {"description": "The only difference between this problem and D2 is that you don't have to provide the way to construct the answer in this problem, but you have to do it in D2.There's a table of $$$n \\times m$$$ cells ($$$n$$$ rows and $$$m$$$ columns). The value of $$$n \\cdot m$$$ is even.A domino is a figure that consists of two cells having a common side. It may be horizontal (one of the cells is to the right of the other) or vertical (one of the cells is above the other).You need to find out whether it is possible to place $$$\\frac{nm}{2}$$$ dominoes on the table so that exactly $$$k$$$ of them are horizontal and all the other dominoes are vertical. The dominoes cannot overlap and must fill the whole table.", "input_spec": "The first line contains one integer $$$t$$$ ($$$1 \\le t \\le 10$$$) \u2014 the number of test cases. Then $$$t$$$ test cases follow. Each test case consists of a single line. The line contains three integers $$$n$$$, $$$m$$$, $$$k$$$ ($$$1 \\le n,m \\le 100$$$, $$$0 \\le k \\le \\frac{nm}{2}$$$, $$$n \\cdot m$$$ is even) \u2014 the number of rows, columns and horizontal dominoes, respectively.", "output_spec": "For each test case output \"YES\", if it is possible to place dominoes in the desired way, or \"NO\" otherwise. You may print each letter in any case (YES, yes, Yes will all be recognized as positive answer, NO, no and nO will all be recognized as negative answer).", "sample_inputs": ["8\n4 4 2\n2 3 0\n3 2 3\n1 2 0\n2 4 2\n5 2 2\n2 17 16\n2 1 1"], "sample_outputs": ["YES\nYES\nYES\nNO\nYES\nNO\nYES\nNO"], "notes": null}, "src_uid": "4d0c0cc8faca62eb6384f8135b30feb8"}
{"nl": {"description": "A number is called almost prime if it has exactly two distinct prime divisors. For example, numbers 6, 18, 24 are almost prime, while 4, 8, 9, 42 are not. Find the amount of almost prime numbers which are between 1 and n, inclusive.", "input_spec": "Input contains one integer number n (1\u2009\u2264\u2009n\u2009\u2264\u20093000).", "output_spec": "Output the amount of almost prime numbers between 1 and n, inclusive.", "sample_inputs": ["10", "21"], "sample_outputs": ["2", "8"], "notes": null}, "src_uid": "356666366625bc5358bc8b97c8d67bd5"}
{"nl": {"description": "Bob loves everything sweet. His favorite chocolate bar consists of pieces, each piece may contain a nut. Bob wants to break the bar of chocolate into multiple pieces so that each part would contain exactly one nut and any break line goes between two adjacent pieces.You are asked to calculate the number of ways he can do it. Two ways to break chocolate are considered distinct if one of them contains a break between some two adjacent pieces and the other one doesn't. Please note, that if Bob doesn't make any breaks, all the bar will form one piece and it still has to have exactly one nut.", "input_spec": "The first line of the input contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of pieces in the chocolate bar. The second line contains n integers ai (0\u2009\u2264\u2009ai\u2009\u2264\u20091), where 0 represents a piece without the nut and 1 stands for a piece with the nut.", "output_spec": "Print the number of ways to break the chocolate into multiple parts so that each part would contain exactly one nut.", "sample_inputs": ["3\n0 1 0", "5\n1 0 1 0 1"], "sample_outputs": ["1", "4"], "notes": "NoteIn the first sample there is exactly one nut, so the number of ways equals 1\u00a0\u2014 Bob shouldn't make any breaks.In the second sample you can break the bar in four ways:10|10|11|010|110|1|011|01|01"}, "src_uid": "58242665476f1c4fa723848ff0ecda98"}
{"nl": {"description": "Petya studies in a school and he adores Maths. His class has been studying arithmetic expressions. On the last class the teacher wrote three positive integers a, b, c on the blackboard. The task was to insert signs of operations '+' and '*', and probably brackets between the numbers so that the value of the resulting expression is as large as possible. Let's consider an example: assume that the teacher wrote numbers 1, 2 and 3 on the blackboard. Here are some ways of placing signs and brackets:  1+2*3=7  1*(2+3)=5  1*2*3=6  (1+2)*3=9 Note that you can insert operation signs only between a and b, and between b and c, that is, you cannot swap integers. For instance, in the given sample you cannot get expression (1+3)*2.It's easy to see that the maximum value that you can obtain is 9.Your task is: given a, b and c print the maximum value that you can get.", "input_spec": "The input contains three integers a, b and c, each on a single line (1\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u200910).", "output_spec": "Print the maximum value of the expression that you can obtain.", "sample_inputs": ["1\n2\n3", "2\n10\n3"], "sample_outputs": ["9", "60"], "notes": null}, "src_uid": "1cad9e4797ca2d80a12276b5a790ef27"}
{"nl": {"description": "You know that Japan is the country with almost the largest 'electronic devices per person' ratio. So you might be quite surprised to find out that the primary school in Japan teaches to count using a Soroban \u2014 an abacus developed in Japan. This phenomenon has its reasons, of course, but we are not going to speak about them. Let's have a look at the Soroban's construction.  Soroban consists of some number of rods, each rod contains five beads. We will assume that the rods are horizontal lines. One bead on each rod (the leftmost one) is divided from the others by a bar (the reckoning bar). This single bead is called go-dama and four others are ichi-damas. Each rod is responsible for representing a single digit from 0 to 9. We can obtain the value of a digit by following simple algorithm:  Set the value of a digit equal to 0.  If the go-dama is shifted to the right, add 5.  Add the number of ichi-damas shifted to the left. Thus, the upper rod on the picture shows digit 0, the middle one shows digit 2 and the lower one shows 7. We will consider the top rod to represent the last decimal digit of a number, so the picture shows number 720.Write the program that prints the way Soroban shows the given number n.", "input_spec": "The first line contains a single integer n (0\u2009\u2264\u2009n\u2009<\u2009109).", "output_spec": "Print the description of the decimal digits of number n from the last one to the first one (as mentioned on the picture in the statement), one per line. Print the beads as large English letters 'O', rod pieces as character '-' and the reckoning bar as '|'. Print as many rods, as many digits are in the decimal representation of number n without leading zeroes. We can assume that number 0 has no leading zeroes.", "sample_inputs": ["2", "13", "720"], "sample_outputs": ["O-|OO-OO", "O-|OOO-O\nO-|O-OOO", "O-|-OOOO\nO-|OO-OO\n-O|OO-OO"], "notes": null}, "src_uid": "c2e3aced0bc76b6484360563355d23a7"}
{"nl": {"description": "Little C loves number \u00ab3\u00bb very much. He loves all things about it.Now he is playing a game on a chessboard of size $$$n \\times m$$$. The cell in the $$$x$$$-th row and in the $$$y$$$-th column is called $$$(x,y)$$$. Initially, The chessboard is empty. Each time, he places two chessmen on two different empty cells, the Manhattan distance between which is exactly $$$3$$$. The Manhattan distance between two cells $$$(x_i,y_i)$$$ and $$$(x_j,y_j)$$$ is defined as $$$|x_i-x_j|+|y_i-y_j|$$$.He want to place as many chessmen as possible on the chessboard. Please help him find the maximum number of chessmen he can place.", "input_spec": "A single line contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\leq n,m \\leq 10^9$$$) \u2014 the number of rows and the number of columns of the chessboard.", "output_spec": "Print one integer \u2014 the maximum number of chessmen Little C can place.", "sample_inputs": ["2 2", "3 3"], "sample_outputs": ["0", "8"], "notes": "NoteIn the first example, the Manhattan distance between any two cells is smaller than $$$3$$$, so the answer is $$$0$$$.In the second example, a possible solution is $$$(1,1)(3,2)$$$, $$$(1,2)(3,3)$$$, $$$(2,1)(1,3)$$$, $$$(3,1)(2,3)$$$."}, "src_uid": "02ce135a4b276d1e9ba6a4ce37f2fe70"}
{"nl": {"description": "You are given two integers n and k. Find k-th smallest divisor of n, or report that it doesn't exist.Divisor of n is any such natural number, that n can be divided by it without remainder.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u20091015, 1\u2009\u2264\u2009k\u2009\u2264\u2009109).", "output_spec": "If n has less than k divisors, output -1. Otherwise, output the k-th smallest divisor of n.", "sample_inputs": ["4 2", "5 3", "12 5"], "sample_outputs": ["2", "-1", "6"], "notes": "NoteIn the first example, number 4 has three divisors: 1, 2 and 4. The second one is 2.In the second example, number 5 has only two divisors: 1 and 5. The third divisor doesn't exist, so the answer is -1."}, "src_uid": "6ba39b428a2d47b7d199879185797ffb"}
{"nl": {"description": "There exists an island called Arpa\u2019s land, some beautiful girls live there, as ugly ones do.Mehrdad wants to become minister of Arpa\u2019s land. Arpa has prepared an exam. Exam has only one question, given n, print the last digit of 1378n.   Mehrdad has become quite confused and wants you to help him. Please help, although it's a naive cheat.", "input_spec": "The single line of input contains one integer n (0\u2009\u2009\u2264\u2009\u2009n\u2009\u2009\u2264\u2009\u2009109).", "output_spec": "Print single integer\u00a0\u2014 the last digit of 1378n.", "sample_inputs": ["1", "2"], "sample_outputs": ["8", "4"], "notes": "NoteIn the first example, last digit of 13781\u2009=\u20091378 is 8.In the second example, last digit of 13782\u2009=\u20091378\u00b71378\u2009=\u20091898884 is 4."}, "src_uid": "4b51b99d1dea367bf37dc5ead08ca48f"}
{"nl": {"description": "In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements. For example, the sequence BDF is a subsequence of ABCDEF. A substring of a string is a continuous subsequence of the string. For example, BCD is a substring of ABCDEF.You are given two strings s1, s2 and another string called virus. Your task is to find the longest common subsequence of s1 and s2, such that it doesn't contain virus as a substring.", "input_spec": "The input contains three strings in three separate lines: s1, s2 and virus (1\u2009\u2264\u2009|s1|,\u2009|s2|,\u2009|virus|\u2009\u2264\u2009100). Each string consists only of uppercase English letters.", "output_spec": "Output the longest common subsequence of s1 and s2 without virus as a substring. If there are multiple answers, any of them will be accepted.  If there is no valid common subsequence, output 0.", "sample_inputs": ["AJKEQSLOBSROFGZ\nOVGURWZLWVLUXTH\nOZ", "AA\nA\nA"], "sample_outputs": ["ORZ", "0"], "notes": null}, "src_uid": "391c2abbe862139733fcb997ba1629b8"}
{"nl": {"description": "On the Literature lesson Sergei noticed an awful injustice, it seems that some students are asked more often than others.Seating in the class looks like a rectangle, where n rows with m pupils in each. The teacher asks pupils in the following order: at first, she asks all pupils from the first row in the order of their seating, then she continues to ask pupils from the next row. If the teacher asked the last row, then the direction of the poll changes, it means that she asks the previous row. The order of asking the rows looks as follows: the 1-st row, the 2-nd row, ..., the n\u2009-\u20091-st row, the n-th row, the n\u2009-\u20091-st row, ..., the 2-nd row, the 1-st row, the 2-nd row, ...The order of asking of pupils on the same row is always the same: the 1-st pupil, the 2-nd pupil, ..., the m-th pupil.During the lesson the teacher managed to ask exactly k questions from pupils in order described above. Sergei seats on the x-th row, on the y-th place in the row. Sergei decided to prove to the teacher that pupils are asked irregularly, help him count three values:  the maximum number of questions a particular pupil is asked,  the minimum number of questions a particular pupil is asked,  how many times the teacher asked Sergei. If there is only one row in the class, then the teacher always asks children from this row.", "input_spec": "The first and the only line contains five integers n, m, k, x and y (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100,\u20091\u2009\u2264\u2009k\u2009\u2264\u20091018,\u20091\u2009\u2264\u2009x\u2009\u2264\u2009n,\u20091\u2009\u2264\u2009y\u2009\u2264\u2009m).", "output_spec": "Print three integers:   the maximum number of questions a particular pupil is asked,  the minimum number of questions a particular pupil is asked,  how many times the teacher asked Sergei. ", "sample_inputs": ["1 3 8 1 1", "4 2 9 4 2", "5 5 25 4 3", "100 100 1000000000000000000 100 100"], "sample_outputs": ["3 2 3", "2 1 1", "1 1 1", "101010101010101 50505050505051 50505050505051"], "notes": "NoteThe order of asking pupils in the first test:   the pupil from the first row who seats at the first table, it means it is Sergei;  the pupil from the first row who seats at the second table;  the pupil from the first row who seats at the third table;  the pupil from the first row who seats at the first table, it means it is Sergei;  the pupil from the first row who seats at the second table;  the pupil from the first row who seats at the third table;  the pupil from the first row who seats at the first table, it means it is Sergei;  the pupil from the first row who seats at the second table; The order of asking pupils in the second test:   the pupil from the first row who seats at the first table;  the pupil from the first row who seats at the second table;  the pupil from the second row who seats at the first table;  the pupil from the second row who seats at the second table;  the pupil from the third row who seats at the first table;  the pupil from the third row who seats at the second table;  the pupil from the fourth row who seats at the first table;  the pupil from the fourth row who seats at the second table, it means it is Sergei;  the pupil from the third row who seats at the first table; "}, "src_uid": "e61debcad37eaa9a6e21d7a2122b8b21"}
{"nl": {"description": "We all know that GukiZ often plays with arrays. Now he is thinking about this problem: how many arrays a, of length n, with non-negative elements strictly less then 2l meet the following condition: ? Here operation  means bitwise AND (in Pascal it is equivalent to and, in C/C++/Java/Python it is equivalent to &), operation  means bitwise OR (in Pascal it is equivalent to , in C/C++/Java/Python it is equivalent to |). Because the answer can be quite large, calculate it modulo m. This time GukiZ hasn't come up with solution, and needs you to help him!", "input_spec": "First and the only line of input contains four integers n, k, l, m (2\u2009\u2264\u2009n\u2009\u2264\u20091018, 0\u2009\u2264\u2009k\u2009\u2264\u20091018, 0\u2009\u2264\u2009l\u2009\u2264\u200964, 1\u2009\u2264\u2009m\u2009\u2264\u2009109\u2009+\u20097).", "output_spec": "In the single line print the number of arrays satisfying the condition above modulo m.", "sample_inputs": ["2 1 2 10", "2 1 1 3", "3 3 2 10"], "sample_outputs": ["3", "1", "9"], "notes": "NoteIn the first sample, satisfying arrays are {1,\u20091},\u2009{3,\u20091},\u2009{1,\u20093}.In the second sample, only satisfying array is {1,\u20091}.In the third sample, satisfying arrays are {0,\u20093,\u20093},\u2009{1,\u20093,\u20092},\u2009{1,\u20093,\u20093},\u2009{2,\u20093,\u20091},\u2009{2,\u20093,\u20093},\u2009{3,\u20093,\u20090},\u2009{3,\u20093,\u20091},\u2009{3,\u20093,\u20092},\u2009{3,\u20093,\u20093}."}, "src_uid": "2163eec2ea1eed5da8231d1882cb0f8e"}
{"nl": {"description": "Gerald has been selling state secrets at leisure. All the secrets cost the same: n marks. The state which secrets Gerald is selling, has no paper money, only coins. But there are coins of all positive integer denominations that are powers of three: 1 mark, 3 marks, 9 marks, 27 marks and so on. There are no coins of other denominations. Of course, Gerald likes it when he gets money without the change. And all buyers respect him and try to give the desired sum without change, if possible. But this does not always happen.One day an unlucky buyer came. He did not have the desired sum without change. Then he took out all his coins and tried to give Gerald a larger than necessary sum with as few coins as possible. What is the maximum number of coins he could get?The formal explanation of the previous paragraph: we consider all the possible combinations of coins for which the buyer can not give Gerald the sum of n marks without change. For each such combination calculate the minimum number of coins that can bring the buyer at least n marks. Among all combinations choose the maximum of the minimum number of coins. This is the number we want.", "input_spec": "The single line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091017). Please, do not use the %lld specifier to read or write 64 bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "In a single line print an integer: the maximum number of coins the unlucky buyer could have paid with.", "sample_inputs": ["1", "4"], "sample_outputs": ["1", "2"], "notes": "NoteIn the first test case, if a buyer has exactly one coin of at least 3 marks, then, to give Gerald one mark, he will have to give this coin. In this sample, the customer can not have a coin of one mark, as in this case, he will be able to give the money to Gerald without any change.In the second test case, if the buyer had exactly three coins of 3 marks, then, to give Gerald 4 marks, he will have to give two of these coins. The buyer cannot give three coins as he wants to minimize the number of coins that he gives."}, "src_uid": "7e7b59f2112fd200ee03255c0c230ebd"}
{"nl": {"description": "While playing with geometric figures Alex has accidentally invented a concept of a $$$n$$$-th order rhombus in a cell grid.A $$$1$$$-st order rhombus is just a square $$$1 \\times 1$$$ (i.e just a cell).A $$$n$$$-th order rhombus for all $$$n \\geq 2$$$ one obtains from a $$$n-1$$$-th order rhombus adding all cells which have a common side with it to it (look at the picture to understand it better).    Alex asks you to compute the number of cells in a $$$n$$$-th order rhombus.", "input_spec": "The first and only input line contains integer $$$n$$$ ($$$1 \\leq n \\leq 100$$$)\u00a0\u2014 order of a rhombus whose numbers of cells should be computed.", "output_spec": "Print exactly one integer\u00a0\u2014 the number of cells in a $$$n$$$-th order rhombus.", "sample_inputs": ["1", "2", "3"], "sample_outputs": ["1", "5", "13"], "notes": "NoteImages of rhombus corresponding to the examples are given in the statement."}, "src_uid": "758d342c1badde6d0b4db81285be780c"}
{"nl": {"description": "Jack is working on his jumping skills recently. Currently he's located at point zero of the number line. He would like to get to the point x. In order to train, he has decided that he'll first jump by only one unit, and each subsequent jump will be exactly one longer than the previous one. He can go either left or right with each jump. He wonders how many jumps he needs to reach x.", "input_spec": "The input data consists of only one integer x (\u2009-\u2009109\u2009\u2264\u2009x\u2009\u2264\u2009109).", "output_spec": "Output the minimal number of jumps that Jack requires to reach x.", "sample_inputs": ["2", "6", "0"], "sample_outputs": ["3", "3", "0"], "notes": null}, "src_uid": "18644c9df41b9960594fdca27f1d2fec"}
{"nl": {"description": "The prestigious Codeforces kindergarten consists of n kids, numbered 1 through n. Each of them are given allowance in rubles by their parents.Today, they are going to the most famous candy shop in the town. The shop sells candies in packages: for all i between 1 and m, inclusive, it sells a package containing exactly i candies. A candy costs one ruble, so a package containing x candies costs x rubles.The kids will purchase candies in turns, starting from kid 1. In a single turn, kid i will purchase one candy package. Due to the highly competitive nature of Codeforces kindergarten, during a turn, the number of candies contained in the package purchased by the kid will always be strictly greater than the number of candies contained in the package purchased by the kid in the preceding turn (an exception is in the first turn: the first kid may purchase any package). Then, the turn proceeds to kid i\u2009+\u20091, or to kid 1 if it was kid n's turn. This process can be ended at any time, but at the end of the purchase process, all the kids must have the same number of candy packages. Of course, the amount spent by each kid on the candies cannot exceed their allowance.You work at the candy shop and would like to prepare the candies for the kids. Print the maximum number of candies that can be sold by the candy shop to the kids. If the kids cannot purchase any candy (due to insufficient allowance), print 0.", "input_spec": "The first line contains two space-separated integers n and m (2\u2009\u2264\u2009n\u2009\u2264\u20092\u00b7105,\u20092\u2009\u2264\u2009m\u2009\u2264\u20095\u00b7106,\u2009n\u2009\u2264\u2009m), denoting the number of kids and the maximum number of candies in a package sold by the candy shop, respectively. Then n lines follow, each line will contain a single positive integer not exceeding  denoting the allowance of a kid in rubles. The allowances are given in order from kid 1 to kid n. Please, do not use the %lld specificator to read or write 64-bit integers in C++. It is recommended to use cin, cout streams (also you may use %I64d specificator).", "output_spec": "Print a single integer denoting the maximum number of candies that can be sold by the candy shop.", "sample_inputs": ["2 5\n5\n10", "3 8\n8\n16\n13", "2 5000000\n12500002500000\n12500002500000"], "sample_outputs": ["13", "32", "12500002500000"], "notes": "NoteFor the first example, one of the scenarios that will result in 13 purchased candies is as follows.   Turn 1. Kid 1 purchases 1 candy.  Turn 2. Kid 2 purchases 3 candies.  Turn 3. Kid 1 purchases 4 candies.  Turn 4. Kid 2 purchases 5 candies. "}, "src_uid": "169f58dc87d26e0fadde6a83bb623f54"}
{"nl": {"description": "Tonio has a keyboard with only two letters, \"V\" and \"K\".One day, he has typed out a string s with only these two letters. He really likes it when the string \"VK\" appears, so he wishes to change at most one letter in the string (or do no changes) to maximize the number of occurrences of that string. Compute the maximum number of times \"VK\" can appear as a substring (i.\u00a0e. a letter \"K\" right after a letter \"V\") in the resulting string.", "input_spec": "The first line will contain a string s consisting only of uppercase English letters \"V\" and \"K\" with length not less than 1 and not greater than 100.", "output_spec": "Output a single integer, the maximum number of times \"VK\" can appear as a substring of the given string after changing at most one character.", "sample_inputs": ["VK", "VV", "V", "VKKKKKKKKKVVVVVVVVVK", "KVKV"], "sample_outputs": ["1", "1", "0", "3", "1"], "notes": "NoteFor the first case, we do not change any letters. \"VK\" appears once, which is the maximum number of times it could appear.For the second case, we can change the second character from a \"V\" to a \"K\". This will give us the string \"VK\". This has one occurrence of the string \"VK\" as a substring.For the fourth case, we can change the fourth character from a \"K\" to a \"V\". This will give us the string \"VKKVKKKKKKVVVVVVVVVK\". This has three occurrences of the string \"VK\" as a substring. We can check no other moves can give us strictly more occurrences."}, "src_uid": "578bae0fe6634882227ac371ebb38fc9"}
{"nl": {"description": "During the breaks between competitions, top-model Izabella tries to develop herself and not to be bored. For example, now she tries to solve Rubik's cube 2x2x2.It's too hard to learn to solve Rubik's cube instantly, so she learns to understand if it's possible to solve the cube in some state using 90-degrees rotation of one face of the cube in any direction.To check her answers she wants to use a program which will for some state of cube tell if it's possible to solve it using one rotation, described above.Cube is called solved if for each face of cube all squares on it has the same color.https://en.wikipedia.org/wiki/Rubik's_Cube", "input_spec": "In first line given a sequence of 24 integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u20096), where ai denotes color of i-th square. There are exactly 4 occurrences of all colors in this sequence.", "output_spec": "Print \u00abYES\u00bb (without quotes) if it's possible to solve cube using one rotation and \u00abNO\u00bb (without quotes) otherwise.", "sample_inputs": ["2 5 4 6 1 3 6 2 5 5 1 2 3 5 3 1 1 2 4 6 6 4 3 4", "5 3 5 3 2 5 2 5 6 2 6 2 4 4 4 4 1 1 1 1 6 3 6 3"], "sample_outputs": ["NO", "YES"], "notes": "NoteIn first test case cube looks like this:  In second test case cube looks like this:   It's possible to solve cube by rotating face with squares with numbers 13, 14, 15, 16."}, "src_uid": "881a820aa8184d9553278a0002a3b7c4"}
{"nl": {"description": "Vasya and Petya wrote down all integers from 1 to n to play the \"powers\" game (n can be quite large; however, Vasya and Petya are not confused by this fact).Players choose numbers in turn (Vasya chooses first). If some number x is chosen at the current turn, it is forbidden to choose x or all of its other positive integer powers (that is, x2, x3, ...) at the next turns. For instance, if the number 9 is chosen at the first turn, one cannot choose 9 or 81 later, while it is still allowed to choose 3 or 27. The one who cannot make a move loses.Who wins if both Vasya and Petya play optimally?", "input_spec": "Input contains single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009109).", "output_spec": "Print the name of the winner \u2014 \"Vasya\" or \"Petya\" (without quotes).", "sample_inputs": ["1", "2", "8"], "sample_outputs": ["Vasya", "Petya", "Petya"], "notes": "NoteIn the first sample Vasya will choose 1 and win immediately.In the second sample no matter which number Vasya chooses during his first turn, Petya can choose the remaining number and win."}, "src_uid": "0e22093668319217b7946e62afe32195"}
{"nl": {"description": "Manao has a monitor. The screen of the monitor has horizontal to vertical length ratio a:b. Now he is going to watch a movie. The movie's frame has horizontal to vertical length ratio c:d. Manao adjusts the view in such a way that the movie preserves the original frame ratio, but also occupies as much space on the screen as possible and fits within it completely. Thus, he may have to zoom the movie in or out, but Manao will always change the frame proportionally in both dimensions.Calculate the ratio of empty screen (the part of the screen not occupied by the movie) to the total screen size. Print the answer as an irreducible fraction p\u2009/\u2009q.", "input_spec": "A single line contains four space-separated integers a, b, c, d (1\u2009\u2264\u2009a,\u2009b,\u2009c,\u2009d\u2009\u2264\u20091000).", "output_spec": "Print the answer to the problem as \"p/q\", where p is a non-negative integer, q is a positive integer and numbers p and q don't have a common divisor larger than 1.", "sample_inputs": ["1 1 3 2", "4 3 2 2"], "sample_outputs": ["1/3", "1/4"], "notes": "NoteSample 1. Manao's monitor has a square screen. The movie has 3:2 horizontal to vertical length ratio. Obviously, the movie occupies most of the screen if the width of the picture coincides with the width of the screen. In this case, only 2/3 of the monitor will project the movie in the horizontal dimension: Sample 2. This time the monitor's width is 4/3 times larger than its height and the movie's frame is square. In this case, the picture must take up the whole monitor in the vertical dimension and only 3/4 in the horizontal dimension: "}, "src_uid": "b0f435fc2f7334aee0d07524bc37cb1e"}
{"nl": {"description": "Alex enjoys performing magic tricks. He has a trick that requires a deck of n cards. He has m identical decks of n different cards each, which have been mixed together. When Alex wishes to perform the trick, he grabs n cards at random and performs the trick with those. The resulting deck looks like a normal deck, but may have duplicates of some cards.The trick itself is performed as follows: first Alex allows you to choose a random card from the deck. You memorize the card and put it back in the deck. Then Alex shuffles the deck, and pulls out a card. If the card matches the one you memorized, the trick is successful.You don't think Alex is a very good magician, and that he just pulls a card randomly from the deck. Determine the probability of the trick being successful if this is the case.", "input_spec": "First line of the input consists of two integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20091000), separated by space \u2014 number of cards in each deck, and number of decks.", "output_spec": "On the only line of the output print one floating point number \u2013 probability of Alex successfully performing the trick. Relative or absolute error of your answer should not be higher than 10\u2009-\u20096.", "sample_inputs": ["2 2", "4 4", "1 2"], "sample_outputs": ["0.6666666666666666", "0.4000000000000000", "1.0000000000000000"], "notes": "NoteIn the first sample, with probability  Alex will perform the trick with two cards with the same value from two different decks. In this case the trick is guaranteed to succeed.With the remaining  probability he took two different cards, and the probability of pulling off the trick is .The resulting probability is "}, "src_uid": "0b9ce20c36e53d4702869660cbb53317"}
{"nl": {"description": "Bizon the Champion is called the Champion for a reason. Bizon the Champion has recently got a present \u2014 a new glass cupboard with n shelves and he decided to put all his presents there. All the presents can be divided into two types: medals and cups. Bizon the Champion has a1 first prize cups, a2 second prize cups and a3 third prize cups. Besides, he has b1 first prize medals, b2 second prize medals and b3 third prize medals. Naturally, the rewards in the cupboard must look good, that's why Bizon the Champion decided to follow the rules:  any shelf cannot contain both cups and medals at the same time;  no shelf can contain more than five cups;  no shelf can have more than ten medals. Help Bizon the Champion find out if we can put all the rewards so that all the conditions are fulfilled.", "input_spec": "The first line contains integers a1, a2 and a3 (0\u2009\u2264\u2009a1,\u2009a2,\u2009a3\u2009\u2264\u2009100). The second line contains integers b1, b2 and b3 (0\u2009\u2264\u2009b1,\u2009b2,\u2009b3\u2009\u2264\u2009100). The third line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100). The numbers in the lines are separated by single spaces.", "output_spec": "Print \"YES\" (without the quotes) if all the rewards can be put on the shelves in the described manner. Otherwise, print \"NO\" (without the quotes).", "sample_inputs": ["1 1 1\n1 1 1\n4", "1 1 3\n2 3 4\n2", "1 0 0\n1 0 0\n1"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "fe6301816dea7d9cea1c3a06a7d1ea7e"}
{"nl": {"description": "Once upon a time in the Kingdom of Far Far Away lived Sir Lancelot, the chief Royal General. He was very proud of his men and he liked to invite the King to come and watch drill exercises which demonstrated the fighting techniques and tactics of the squad he was in charge of. But time went by and one day Sir Lancelot had a major argument with the Fairy Godmother (there were rumors that the argument occurred after the general spoke badly of the Godmother's flying techniques. That seemed to hurt the Fairy Godmother very deeply). As the result of the argument, the Godmother put a rather strange curse upon the general. It sounded all complicated and quite harmless: \"If the squared distance between some two soldiers equals to 5, then those soldiers will conflict with each other!\"The drill exercises are held on a rectangular n\u2009\u00d7\u2009m field, split into nm square 1\u2009\u00d7\u20091 segments for each soldier. Thus, the square of the distance between the soldiers that stand on squares (x1,\u2009y1) and (x2,\u2009y2) equals exactly (x1\u2009-\u2009x2)2\u2009+\u2009(y1\u2009-\u2009y2)2. Now not all nm squad soldiers can participate in the drill exercises as it was before the Fairy Godmother's curse. Unless, of course, the general wants the soldiers to fight with each other or even worse... For example, if he puts a soldier in the square (2,\u20092), then he cannot put soldiers in the squares (1,\u20094), (3,\u20094), (4,\u20091) and (4,\u20093) \u2014 each of them will conflict with the soldier in the square (2,\u20092).Your task is to help the general. You are given the size of the drill exercise field. You are asked to calculate the maximum number of soldiers that can be simultaneously positioned on this field, so that no two soldiers fall under the Fairy Godmother's curse.", "input_spec": "The single line contains space-separated integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20091000) that represent the size of the drill exercise field.", "output_spec": "Print the desired maximum number of warriors.", "sample_inputs": ["2 4", "3 4"], "sample_outputs": ["4", "6"], "notes": "NoteIn the first sample test Sir Lancelot can place his 4 soldiers on the 2\u2009\u00d7\u20094 court as follows (the soldiers' locations are marked with gray circles on the scheme):  In the second sample test he can place 6 soldiers on the 3\u2009\u00d7\u20094 site in the following manner:  "}, "src_uid": "e858e7f22d91aaadd7a48a174d7b2dc9"}
{"nl": {"description": "There are n students who have taken part in an olympiad. Now it's time to award the students.Some of them will receive diplomas, some wiil get certificates, and others won't receive anything. Students with diplomas and certificates are called winners. But there are some rules of counting the number of diplomas and certificates. The number of certificates must be exactly k times greater than the number of diplomas. The number of winners must not be greater than half of the number of all students (i.e. not be greater than half of n). It's possible that there are no winners.You have to identify the maximum possible number of winners, according to these rules. Also for this case you have to calculate the number of students with diplomas, the number of students with certificates and the number of students who are not winners.", "input_spec": "The first (and the only) line of input contains two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u20091012), where n is the number of students and k is the ratio between the number of certificates and the number of diplomas.", "output_spec": "Output three numbers: the number of students with diplomas, the number of students with certificates and the number of students who are not winners in case when the number of winners is maximum possible. It's possible that there are no winners.", "sample_inputs": ["18 2", "9 10", "1000000000000 5", "1000000000000 499999999999"], "sample_outputs": ["3 6 9", "0 0 9", "83333333333 416666666665 500000000002", "1 499999999999 500000000000"], "notes": null}, "src_uid": "405a70c3b3f1561a9546910ab3fb5c80"}
{"nl": {"description": "Alice is the leader of the State Refactoring Party, and she is about to become the prime minister. The elections have just taken place. There are $$$n$$$ parties, numbered from $$$1$$$ to $$$n$$$. The $$$i$$$-th party has received $$$a_i$$$ seats in the parliament.Alice's party has number $$$1$$$. In order to become the prime minister, she needs to build a coalition, consisting of her party and possibly some other parties. There are two conditions she needs to fulfil:   The total number of seats of all parties in the coalition must be a strict majority of all the seats, i.e. it must have strictly more than half of the seats. For example, if the parliament has $$$200$$$ (or $$$201$$$) seats, then the majority is $$$101$$$ or more seats.  Alice's party must have at least $$$2$$$ times more seats than any other party in the coalition. For example, to invite a party with $$$50$$$ seats, Alice's party must have at least $$$100$$$ seats. For example, if $$$n=4$$$ and $$$a=[51, 25, 99, 25]$$$ (note that Alice'a party has $$$51$$$ seats), then the following set $$$[a_1=51, a_2=25, a_4=25]$$$ can create a coalition since both conditions will be satisfied. However, the following sets will not create a coalition:  $$$[a_2=25, a_3=99, a_4=25]$$$ since Alice's party is not there;  $$$[a_1=51, a_2=25]$$$ since coalition should have a strict majority;  $$$[a_1=51, a_2=25, a_3=99]$$$ since Alice's party should have at least $$$2$$$ times more seats than any other party in the coalition. Alice does not have to minimise the number of parties in a coalition. If she wants, she can invite as many parties as she wants (as long as the conditions are satisfied). If Alice's party has enough people to create a coalition on her own, she can invite no parties.Note that Alice can either invite a party as a whole or not at all. It is not possible to invite only some of the deputies (seats) from another party. In other words, if Alice invites a party, she invites all its deputies.Find and print any suitable coalition.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$2 \\leq n \\leq 100$$$)\u00a0\u2014 the number of parties. The second line contains $$$n$$$ space separated integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\leq a_i \\leq 100$$$)\u00a0\u2014 the number of seats the $$$i$$$-th party has.", "output_spec": "If no coalition satisfying both conditions is possible, output a single line with an integer $$$0$$$. Otherwise, suppose there are $$$k$$$ ($$$1 \\leq k \\leq n$$$) parties in the coalition (Alice does not have to minimise the number of parties in a coalition), and their indices are $$$c_1, c_2, \\dots, c_k$$$ ($$$1 \\leq c_i \\leq n$$$). Output two lines, first containing the integer $$$k$$$, and the second the space-separated indices $$$c_1, c_2, \\dots, c_k$$$.  You may print the parties in any order. Alice's party (number $$$1$$$) must be on that list. If there are multiple solutions, you may print any of them.", "sample_inputs": ["3\n100 50 50", "3\n80 60 60", "2\n6 5", "4\n51 25 99 25"], "sample_outputs": ["2\n1 2", "0", "1\n1", "3\n1 2 4"], "notes": "NoteIn the first example, Alice picks the second party. Note that she can also pick the third party or both of them. However, she cannot become prime minister without any of them, because $$$100$$$ is not a strict majority out of $$$200$$$.In the second example, there is no way of building a majority, as both other parties are too large to become a coalition partner.In the third example, Alice already has the majority. The fourth example is described in the problem statement."}, "src_uid": "0a71fdaaf08c18396324ad762b7379d7"}
{"nl": {"description": "Vasya has n days of vacations! So he decided to improve his IT skills and do sport. Vasya knows the following information about each of this n days: whether that gym opened and whether a contest was carried out in the Internet on that day. For the i-th day there are four options:  on this day the gym is closed and the contest is not carried out;  on this day the gym is closed and the contest is carried out;  on this day the gym is open and the contest is not carried out;  on this day the gym is open and the contest is carried out. On each of days Vasya can either have a rest or write the contest (if it is carried out on this day), or do sport (if the gym is open on this day).Find the minimum number of days on which Vasya will have a rest (it means, he will not do sport and write the contest at the same time). The only limitation that Vasya has \u2014 he does not want to do the same activity on two consecutive days: it means, he will not do sport on two consecutive days, and write the contest on two consecutive days.", "input_spec": "The first line contains a positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of days of Vasya's vacations. The second line contains the sequence of integers a1,\u2009a2,\u2009...,\u2009an (0\u2009\u2264\u2009ai\u2009\u2264\u20093) separated by space, where:    ai equals 0, if on the i-th day of vacations the gym is closed and the contest is not carried out;  ai equals 1, if on the i-th day of vacations the gym is closed, but the contest is carried out;  ai equals 2, if on the i-th day of vacations the gym is open and the contest is not carried out;  ai equals 3, if on the i-th day of vacations the gym is open and the contest is carried out.", "output_spec": "Print the minimum possible number of days on which Vasya will have a rest. Remember that Vasya refuses:   to do sport on any two consecutive days,  to write the contest on any two consecutive days. ", "sample_inputs": ["4\n1 3 2 0", "7\n1 3 3 2 1 2 3", "2\n2 2"], "sample_outputs": ["2", "0", "1"], "notes": "NoteIn the first test Vasya can write the contest on the day number 1 and do sport on the day number 3. Thus, he will have a rest for only 2 days.In the second test Vasya should write contests on days number 1, 3, 5 and 7, in other days do sport. Thus, he will not have a rest for a single day.In the third test Vasya can do sport either on a day number 1 or number 2. He can not do sport in two days, because it will be contrary to the his limitation. Thus, he will have a rest for only one day."}, "src_uid": "08f1ba79ced688958695a7cfcfdda035"}
{"nl": {"description": "Students Vasya and Petya are studying at the BSU (Byteland State University). At one of the breaks they decided to order a pizza. In this problem pizza is a circle of some radius. The pizza was delivered already cut into n pieces. The i-th piece is a sector of angle equal to ai. Vasya and Petya want to divide all pieces of pizza into two continuous sectors in such way that the difference between angles of these sectors is minimal. Sector angle is sum of angles of all pieces in it. Pay attention, that one of sectors can be empty.", "input_spec": "The first line contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009360) \u00a0\u2014 the number of pieces into which the delivered pizza was cut. The second line contains n integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009360) \u00a0\u2014 the angles of the sectors into which the pizza was cut. The sum of all ai is 360.", "output_spec": "Print one integer \u00a0\u2014 the minimal difference between angles of sectors that will go to Vasya and Petya.", "sample_inputs": ["4\n90 90 90 90", "3\n100 100 160", "1\n360", "4\n170 30 150 10"], "sample_outputs": ["0", "40", "360", "0"], "notes": "NoteIn first sample Vasya can take 1 and 2 pieces, Petya can take 3 and 4 pieces. Then the answer is |(90\u2009+\u200990)\u2009-\u2009(90\u2009+\u200990)|\u2009=\u20090.In third sample there is only one piece of pizza that can be taken by only one from Vasya and Petya. So the answer is |360\u2009-\u20090|\u2009=\u2009360.In fourth sample Vasya can take 1 and 4 pieces, then Petya will take 2 and 3 pieces. So the answer is |(170\u2009+\u200910)\u2009-\u2009(30\u2009+\u2009150)|\u2009=\u20090.Picture explaning fourth sample:Both red and green sectors consist of two adjacent pieces of pizza. So Vasya can take green sector, then Petya will take red sector."}, "src_uid": "1b6a6aff81911865356ec7cbf6883e82"}
{"nl": {"description": "Your task is the exact same as for the easy version. But this time, the marmots subtract the village's population P from their random number before responding to Heidi's request.Also, there are now villages with as few as a single inhabitant, meaning that .Can you help Heidi find out whether a village follows a Poisson or a uniform distribution?", "input_spec": "Same as for the easy and medium versions. But remember that now 1\u2009\u2264\u2009P\u2009\u2264\u20091000 and that the marmots may provide positive as well as negative integers.", "output_spec": "Output one line per village, in the same order as provided in the input. The village's line shall state poisson if the village's distribution is of the Poisson type, and uniform if the answers came from a uniform distribution.", "sample_inputs": [], "sample_outputs": [], "notes": null}, "src_uid": "6ef75e501b318c0799d3cbe8ca998984"}
{"nl": {"description": "Bizon the Champion isn't just charming, he also is very smart.While some of us were learning the multiplication table, Bizon the Champion had fun in his own manner. Bizon the Champion painted an n\u2009\u00d7\u2009m multiplication table, where the element on the intersection of the i-th row and j-th column equals i\u00b7j (the rows and columns of the table are numbered starting from 1). Then he was asked: what number in the table is the k-th largest number? Bizon the Champion always answered correctly and immediately. Can you repeat his success?Consider the given multiplication table. If you write out all n\u00b7m numbers from the table in the non-decreasing order, then the k-th number you write out is called the k-th largest number.", "input_spec": "The single line contains integers n, m and k (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20095\u00b7105;\u00a01\u2009\u2264\u2009k\u2009\u2264\u2009n\u00b7m).", "output_spec": "Print the k-th largest number in a n\u2009\u00d7\u2009m multiplication table.", "sample_inputs": ["2 2 2", "2 3 4", "1 10 5"], "sample_outputs": ["2", "3", "5"], "notes": "NoteA 2\u2009\u00d7\u20093 multiplication table looks like this:1 2 32 4 6"}, "src_uid": "13a918eca30799b240ceb9de47507a26"}
{"nl": {"description": "You will receive 3 points for solving this problem.Manao is designing the genetic code for a new type of algae to efficiently produce fuel. Specifically, Manao is focusing on a stretch of DNA that encodes one protein. The stretch of DNA is represented by a string containing only the characters 'A', 'T', 'G' and 'C'.Manao has determined that if the stretch of DNA contains a maximal sequence of consecutive identical nucleotides that is of even length, then the protein will be nonfunctional. For example, consider a protein described by DNA string \"GTTAAAG\". It contains four maximal sequences of consecutive identical nucleotides: \"G\", \"TT\", \"AAA\", and \"G\". The protein is nonfunctional because sequence \"TT\" has even length.Manao is trying to obtain a functional protein from the protein he currently has. Manao can insert additional nucleotides into the DNA stretch. Each additional nucleotide is a character from the set {'A', 'T', 'G', 'C'}. Manao wants to determine the minimum number of insertions necessary to make the DNA encode a functional protein.", "input_spec": "The input consists of a single line, containing a string s of length n (1\u2009\u2264\u2009n\u2009\u2264\u2009100). Each character of s will be from the set {'A', 'T', 'G', 'C'}. This problem doesn't have subproblems. You will get 3 points for the correct submission.", "output_spec": "The program should print on one line a single integer representing the minimum number of 'A', 'T', 'G', 'C' characters that are required to be inserted into the input string in order to make all runs of identical characters have odd length.", "sample_inputs": ["GTTAAAG", "AACCAACCAAAAC"], "sample_outputs": ["1", "5"], "notes": "NoteIn the first example, it is sufficient to insert a single nucleotide of any type between the two 'T's in the sequence to restore the functionality of the protein."}, "src_uid": "8b26ca1ca2b28166c3d25dceb1f3d49f"}
{"nl": {"description": "InputThe only line of the input is a string of 7 characters. The first character is letter A, followed by 6 digits. The input is guaranteed to be valid (for certain definition of \"valid\").OutputOutput a single integer.ExamplesInputA221033Output21InputA223635Output22InputA232726Output23", "input_spec": "The only line of the input is a string of 7 characters. The first character is letter A, followed by 6 digits. The input is guaranteed to be valid (for certain definition of \"valid\").", "output_spec": "Output a single integer.", "sample_inputs": ["A221033", "A223635", "A232726"], "sample_outputs": ["21", "22", "23"], "notes": null}, "src_uid": "47287f8bc61fec72d729638d5e0e67f5"}
{"nl": {"description": "You are given an undirected graph where each edge has one of two colors: black or red.Your task is to assign a real number to each node so that:   for each black edge the sum of values at its endpoints is $$$1$$$;  for each red edge the sum of values at its endpoints is $$$2$$$;  the sum of the absolute values of all assigned numbers is the smallest possible. Otherwise, if it is not possible, report that there is no feasible assignment of the numbers.", "input_spec": "The first line contains two integers $$$N$$$ ($$$1 \\leq N \\leq 100\\,000$$$) and $$$M$$$ ($$$0 \\leq M \\leq 200\\,000$$$): the number of nodes and the number of edges, respectively. The nodes are numbered by consecutive integers: $$$1, 2, \\ldots, N$$$. The next $$$M$$$ lines describe the edges. Each line contains three integers $$$a$$$, $$$b$$$ and $$$c$$$ denoting that there is an edge between nodes $$$a$$$ and $$$b$$$ ($$$1 \\leq a, b \\leq N$$$) with color $$$c$$$ ($$$1$$$ denotes black, $$$2$$$ denotes red).", "output_spec": "If there is a solution, the first line should contain the word \"YES\" and the second line should contain $$$N$$$ space-separated numbers. For each $$$i$$$ ($$$1 \\le i \\le N$$$), the $$$i$$$-th number should be the number assigned to the node $$$i$$$. Output should be such that:    the sum of the numbers at the endpoints of each edge differs from the precise value by less than $$$10^{-6}$$$;  the sum of the absolute values of all assigned numbers differs from the smallest possible by less than $$$10^{-6}$$$.  If there are several valid solutions, output any of them. If there is no solution, the only line should contain the word \"NO\".", "sample_inputs": ["4 4\n1 2 1\n2 3 2\n1 3 2\n3 4 1", "2 1\n1 2 1", "3 2\n1 2 2\n2 3 2", "3 4\n1 2 2\n2 2 1\n2 1 1\n1 2 2"], "sample_outputs": ["YES\n0.5 0.5 1.5 -0.5", "YES\n0.3 0.7", "YES\n0 2 0", "NO"], "notes": "NoteNote that in the second example the solution is not unique."}, "src_uid": "791cbe2700b11e9dd9a442de3ef913f8"}
{"nl": {"description": "Vanya got an important task \u2014 he should enumerate books in the library and label each book with its number. Each of the n books should be assigned with a number from 1 to n. Naturally, distinct books should be assigned distinct numbers.Vanya wants to know how many digits he will have to write down as he labels the books.", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009109) \u2014 the number of books in the library.", "output_spec": "Print the number of digits needed to number all the books.", "sample_inputs": ["13", "4"], "sample_outputs": ["17", "4"], "notes": "NoteNote to the first test. The books get numbers 1,\u20092,\u20093,\u20094,\u20095,\u20096,\u20097,\u20098,\u20099,\u200910,\u200911,\u200912,\u200913, which totals to 17 digits.Note to the second sample. The books get numbers 1,\u20092,\u20093,\u20094, which totals to 4 digits."}, "src_uid": "4e652ccb40632bf4b9dd95b9f8ae1ec9"}
{"nl": {"description": "One day the Codeforces round author sat exams. He had n exams and he needed to get an integer from 2 to 5 for each exam. He will have to re-sit each failed exam, i.e. the exam that gets mark 2. The author would need to spend too much time and effort to make the sum of his marks strictly more than k. That could have spoilt the Codeforces round. On the other hand, if the sum of his marks is strictly less than k, the author's mum won't be pleased at all. The Codeforces authors are very smart and they always get the mark they choose themselves. Also, the Codeforces authors just hate re-sitting exams. Help the author and find the minimum number of exams he will have to re-sit if he passes the exams in the way that makes the sum of marks for all n exams equal exactly k.", "input_spec": "The single input line contains space-separated integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u200950, 1\u2009\u2264\u2009k\u2009\u2264\u2009250) \u2014 the number of exams and the required sum of marks. It is guaranteed that there exists a way to pass n exams in the way that makes the sum of marks equal exactly k.", "output_spec": "Print the single number \u2014 the minimum number of exams that the author will get a 2 for, considering that the sum of marks for all exams must equal k.", "sample_inputs": ["4 8", "4 10", "1 3"], "sample_outputs": ["4", "2", "0"], "notes": "NoteIn the first sample the author has to get a 2 for all his exams.In the second sample he should get a 3 for two exams and a 2 for two more.In the third sample he should get a 3 for one exam."}, "src_uid": "5a5e46042c3f18529a03cb5c868df7e8"}
{"nl": {"description": "InputThe input contains two integers a1,\u2009a2 (0\u2009\u2264\u2009ai\u2009\u2264\u2009109), separated by a single space.OutputOutput a single integer.ExamplesInput3 14Output44Input27 12Output48Input100 200Output102", "input_spec": "The input contains two integers a1,\u2009a2 (0\u2009\u2264\u2009ai\u2009\u2264\u2009109), separated by a single space.", "output_spec": "Output a single integer.", "sample_inputs": ["3 14", "27 12", "100 200"], "sample_outputs": ["44", "48", "102"], "notes": null}, "src_uid": "69b219054cad0844fc4f15df463e09c0"}
{"nl": {"description": "Ksenia has ordinary pan scales and several weights of an equal mass. Ksenia has already put some weights on the scales, while other weights are untouched. Ksenia is now wondering whether it is possible to put all the remaining weights on the scales so that the scales were in equilibrium. The scales is in equilibrium if the total sum of weights on the left pan is equal to the total sum of weights on the right pan.", "input_spec": "The first line has a non-empty sequence of characters describing the scales. In this sequence, an uppercase English letter indicates a weight, and the symbol \"|\" indicates the delimiter (the character occurs in the sequence exactly once). All weights that are recorded in the sequence before the delimiter are initially on the left pan of the scale. All weights that are recorded in the sequence after the delimiter are initially on the right pan of the scale.  The second line contains a non-empty sequence containing uppercase English letters. Each letter indicates a weight which is not used yet.  It is guaranteed that all the English letters in the input data are different. It is guaranteed that the input does not contain any extra characters.", "output_spec": "If you cannot put all the weights on the scales so that the scales were in equilibrium, print string \"Impossible\". Otherwise, print the description of the resulting scales, copy the format of the input. If there are multiple answers, print any of them.", "sample_inputs": ["AC|T\nL", "|ABC\nXYZ", "W|T\nF", "ABC|\nD"], "sample_outputs": ["AC|TL", "XYZ|ABC", "Impossible", "Impossible"], "notes": null}, "src_uid": "917f173b8523ddd38925238e5d2089b9"}
{"nl": {"description": "Panic is rising in the committee for doggo standardization\u00a0\u2014 the puppies of the new brood have been born multi-colored! In total there are 26 possible colors of puppies in the nature and they are denoted by letters from 'a' to 'z' inclusive.The committee rules strictly prohibit even the smallest diversity between doggos and hence all the puppies should be of the same color. Thus Slava, the committee employee, has been assigned the task to recolor some puppies into other colors in order to eliminate the difference and make all the puppies have one common color.Unfortunately, due to bureaucratic reasons and restricted budget, there's only one operation Slava can perform: he can choose a color $$$x$$$ such that there are currently at least two puppies of color $$$x$$$ and recolor all puppies of the color $$$x$$$ into some arbitrary color $$$y$$$. Luckily, this operation can be applied multiple times (including zero).For example, if the number of puppies is $$$7$$$ and their colors are represented as the string \"abababc\", then in one operation Slava can get the results \"zbzbzbc\", \"bbbbbbc\", \"aaaaaac\", \"acacacc\" and others. However, if the current color sequence is \"abababc\", then he can't choose $$$x$$$='c' right now, because currently only one puppy has the color 'c'.Help Slava and the committee determine whether it is possible to standardize all the puppies, i.e. after Slava's operations all the puppies should have the same color.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 10^5$$$)\u00a0\u2014 the number of puppies. The second line contains a string $$$s$$$ of length $$$n$$$ consisting of lowercase Latin letters, where the $$$i$$$-th symbol denotes the $$$i$$$-th puppy's color.", "output_spec": "If it's possible to recolor all puppies into one color, print \"Yes\". Otherwise print \"No\". Output the answer without quotation signs.", "sample_inputs": ["6\naabddc", "3\nabc", "3\njjj"], "sample_outputs": ["Yes", "No", "Yes"], "notes": "NoteIn the first example Slava can perform the following steps:   take all puppies of color 'a' (a total of two) and recolor them into 'b';  take all puppies of color 'd' (a total of two) and recolor them into 'c';  take all puppies of color 'b' (three puppies for now) and recolor them into 'c'. In the second example it's impossible to recolor any of the puppies.In the third example all the puppies' colors are the same; thus there's no need to recolor anything."}, "src_uid": "6b22e93f7e429693dcfe3c099346dcda"}
{"nl": {"description": "Bob is about to take a hot bath. There are two taps to fill the bath: a hot water tap and a cold water tap. The cold water's temperature is t1, and the hot water's temperature is t2. The cold water tap can transmit any integer number of water units per second from 0 to x1, inclusive. Similarly, the hot water tap can transmit from 0 to x2 water units per second.If y1 water units per second flow through the first tap and y2 water units per second flow through the second tap, then the resulting bath water temperature will be:Bob wants to open both taps so that the bath water temperature was not less than t0. However, the temperature should be as close as possible to this value. If there are several optimal variants, Bob chooses the one that lets fill the bath in the quickest way possible.Determine how much each tap should be opened so that Bob was pleased with the result in the end.", "input_spec": "You are given five integers t1, t2, x1, x2 and t0 (1\u2009\u2264\u2009t1\u2009\u2264\u2009t0\u2009\u2264\u2009t2\u2009\u2264\u2009106, 1\u2009\u2264\u2009x1,\u2009x2\u2009\u2264\u2009106).", "output_spec": "Print two space-separated integers y1 and y2 (0\u2009\u2264\u2009y1\u2009\u2264\u2009x1, 0\u2009\u2264\u2009y2\u2009\u2264\u2009x2).", "sample_inputs": ["10 70 100 100 25", "300 500 1000 1000 300", "143 456 110 117 273"], "sample_outputs": ["99 33", "1000 0", "76 54"], "notes": "NoteIn the second sample the hot water tap shouldn't be opened, but the cold water tap should be opened at full capacity in order to fill the bath in the quickest way possible."}, "src_uid": "87a500829c1935ded3ef6e4e47096b9f"}
{"nl": {"description": "When preparing a tournament, Codeforces coordinators try treir best to make the first problem as easy as possible. This time the coordinator had chosen some problem and asked $$$n$$$ people about their opinions. Each person answered whether this problem is easy or hard.If at least one of these $$$n$$$ people has answered that the problem is hard, the coordinator decides to change the problem. For the given responses, check if the problem is easy enough.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 100$$$) \u2014 the number of people who were asked to give their opinions. The second line contains $$$n$$$ integers, each integer is either $$$0$$$ or $$$1$$$. If $$$i$$$-th integer is $$$0$$$, then $$$i$$$-th person thinks that the problem is easy; if it is $$$1$$$, then $$$i$$$-th person thinks that the problem is hard.", "output_spec": "Print one word: \"EASY\" if the problem is easy according to all responses, or \"HARD\" if there is at least one person who thinks the problem is hard.  You may print every letter in any register: \"EASY\", \"easy\", \"EaSY\" and \"eAsY\" all will be processed correctly.", "sample_inputs": ["3\n0 0 1", "1\n0"], "sample_outputs": ["HARD", "EASY"], "notes": "NoteIn the first example the third person says it's a hard problem, so it should be replaced.In the second example the problem easy for the only person, so it doesn't have to be replaced."}, "src_uid": "060406cd57739d929f54b4518a7ba83e"}
{"nl": {"description": "You are given $$$a$$$ uppercase Latin letters 'A' and $$$b$$$ letters 'B'.The period of the string is the smallest such positive integer $$$k$$$ that $$$s_i = s_{i~mod~k}$$$ ($$$0$$$-indexed) for each $$$i$$$. Note that this implies that $$$k$$$ won't always divide $$$a+b = |s|$$$.For example, the period of string \"ABAABAA\" is $$$3$$$, the period of \"AAAA\" is $$$1$$$, and the period of \"AABBB\" is $$$5$$$.Find the number of different periods over all possible strings with $$$a$$$ letters 'A' and $$$b$$$ letters 'B'.", "input_spec": "The first line contains two integers $$$a$$$ and $$$b$$$ ($$$1 \\le a, b \\le 10^9$$$) \u2014 the number of letters 'A' and 'B', respectively.", "output_spec": "Print the number of different periods over all possible strings with $$$a$$$ letters 'A' and $$$b$$$ letters 'B'.", "sample_inputs": ["2 4", "5 3"], "sample_outputs": ["4", "5"], "notes": "NoteAll the possible periods for the first example:   $$$3$$$ \"BBABBA\"  $$$4$$$ \"BBAABB\"  $$$5$$$ \"BBBAAB\"  $$$6$$$ \"AABBBB\" All the possible periods for the second example:   $$$3$$$ \"BAABAABA\"  $$$5$$$ \"BAABABAA\"  $$$6$$$ \"BABAAABA\"  $$$7$$$ \"BAABAAAB\"  $$$8$$$ \"AAAAABBB\" Note that these are not the only possible strings for the given periods."}, "src_uid": "0e6a204565fef118ea99d2fa1e378dd0"}
{"nl": {"description": "A monster is attacking the Cyberland!Master Yang, a braver, is going to beat the monster. Yang and the monster each have 3 attributes: hitpoints (HP), offensive power (ATK) and defensive power (DEF).During the battle, every second the monster's HP decrease by max(0,\u2009ATKY\u2009-\u2009DEFM), while Yang's HP decreases by max(0,\u2009ATKM\u2009-\u2009DEFY), where index Y denotes Master Yang and index M denotes monster. Both decreases happen simultaneously Once monster's HP\u2009\u2264\u20090 and the same time Master Yang's HP\u2009>\u20090, Master Yang wins.Master Yang can buy attributes from the magic shop of Cyberland: h bitcoins per HP, a bitcoins per ATK, and d bitcoins per DEF.Now Master Yang wants to know the minimum number of bitcoins he can spend in order to win.", "input_spec": "The first line contains three integers HPY,\u2009ATKY,\u2009DEFY, separated by a space, denoting the initial HP, ATK and DEF of Master Yang. The second line contains three integers HPM,\u2009ATKM,\u2009DEFM, separated by a space, denoting the HP, ATK and DEF of the monster. The third line contains three integers h,\u2009a,\u2009d, separated by a space, denoting the price of 1\u00a0HP, 1\u00a0ATK and 1\u00a0DEF. All numbers in input are integer and lie between 1 and 100 inclusively.", "output_spec": "The only output line should contain an integer, denoting the minimum bitcoins Master Yang should spend in order to win.", "sample_inputs": ["1 2 1\n1 100 1\n1 100 100", "100 100 100\n1 1 1\n1 1 1"], "sample_outputs": ["99", "0"], "notes": "NoteFor the first sample, prices for ATK and DEF are extremely high. Master Yang can buy 99 HP, then he can beat the monster with 1 HP left.For the second sample, Master Yang is strong enough to beat the monster, so he doesn't need to buy anything."}, "src_uid": "bf8a133154745e64a547de6f31ddc884"}
{"nl": {"description": "Imagine you have an infinite 2D plane with Cartesian coordinate system. Some of the integral points are blocked, and others are not. Two integral points A and B on the plane are 4-connected if and only if:  the Euclidean distance between A and B is one unit and neither A nor B is blocked;  or there is some integral point C, such that A is 4-connected with C, and C is 4-connected with B. Let's assume that the plane doesn't contain blocked points. Consider all the integral points of the plane whose Euclidean distance from the origin is no more than n, we'll name these points special. Chubby Yang wants to get the following property: no special point is 4-connected to some non-special point. To get the property she can pick some integral points of the plane and make them blocked. What is the minimum number of points she needs to pick?", "input_spec": "The first line contains an integer n (0\u2009\u2264\u2009n\u2009\u2264\u20094\u00b7107).", "output_spec": "Print a single integer \u2014 the minimum number of points that should be blocked.", "sample_inputs": ["1", "2", "3"], "sample_outputs": ["4", "8", "16"], "notes": null}, "src_uid": "d87ce09acb8401e910ca6ef3529566f4"}
{"nl": {"description": "We define $$$x \\bmod y$$$ as the remainder of division of $$$x$$$ by $$$y$$$ ($$$\\%$$$ operator in C++ or Java, mod operator in Pascal).Let's call an array of positive integers $$$[a_1, a_2, \\dots, a_k]$$$ stable if for every permutation $$$p$$$ of integers from $$$1$$$ to $$$k$$$, and for every non-negative integer $$$x$$$, the following condition is met: $$$ (((x \\bmod a_1) \\bmod a_2) \\dots \\bmod a_{k - 1}) \\bmod a_k = (((x \\bmod a_{p_1}) \\bmod a_{p_2}) \\dots \\bmod a_{p_{k - 1}}) \\bmod a_{p_k} $$$ That is, for each non-negative integer $$$x$$$, the value of $$$(((x \\bmod a_1) \\bmod a_2) \\dots \\bmod a_{k - 1}) \\bmod a_k$$$ does not change if we reorder the elements of the array $$$a$$$.For two given integers $$$n$$$ and $$$k$$$, calculate the number of stable arrays $$$[a_1, a_2, \\dots, a_k]$$$ such that $$$1 \\le a_1 < a_2 < \\dots < a_k \\le n$$$.", "input_spec": "The only line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n, k \\le 5 \\cdot 10^5$$$).", "output_spec": "Print one integer \u2014 the number of stable arrays $$$[a_1, a_2, \\dots, a_k]$$$ such that $$$1 \\le a_1 < a_2 < \\dots < a_k \\le n$$$. Since the answer may be large, print it modulo $$$998244353$$$.", "sample_inputs": ["7 3", "3 7", "1337 42", "1 1", "500000 1"], "sample_outputs": ["16", "0", "95147305", "1", "500000"], "notes": null}, "src_uid": "8e8eb64a047cb970a549ee870c3d280d"}
{"nl": {"description": "  Walking through the streets of Marshmallow City, Slastyona have spotted some merchants selling a kind of useless toy which is very popular nowadays\u00a0\u2013 caramel spinner! Wanting to join the craze, she has immediately bought the strange contraption.Spinners in Sweetland have the form of V-shaped pieces of caramel. Each spinner can, well, spin around an invisible magic axis. At a specific point in time, a spinner can take 4 positions shown below (each one rotated 90 degrees relative to the previous, with the fourth one followed by the first one):  After the spinner was spun, it starts its rotation, which is described by a following algorithm: the spinner maintains its position for a second then majestically switches to the next position in clockwise or counter-clockwise order, depending on the direction the spinner was spun in.Slastyona managed to have spinner rotating for exactly n seconds. Being fascinated by elegance of the process, she completely forgot the direction the spinner was spun in! Lucky for her, she managed to recall the starting position, and wants to deduct the direction given the information she knows. Help her do this.", "input_spec": "There are two characters in the first string\u00a0\u2013 the starting and the ending position of a spinner. The position is encoded with one of the following characters: v (ASCII code 118, lowercase v), < (ASCII code 60), ^ (ASCII code 94) or > (ASCII code 62) (see the picture above for reference). Characters are separated by a single space. In the second strings, a single number n is given (0\u2009\u2264\u2009n\u2009\u2264\u2009109)\u00a0\u2013 the duration of the rotation. It is guaranteed that the ending position of a spinner is a result of a n second spin in any of the directions, assuming the given starting position.", "output_spec": "Output cw, if the direction is clockwise, ccw\u00a0\u2013 if counter-clockwise, and undefined otherwise.", "sample_inputs": ["^ >\n1", "< ^\n3", "^ v\n6"], "sample_outputs": ["cw", "ccw", "undefined"], "notes": null}, "src_uid": "fb99ef80fd21f98674fe85d80a2e5298"}
{"nl": {"description": "A sequence of non-negative integers a1,\u2009a2,\u2009...,\u2009an of length n is called a wool sequence if and only if there exists two integers l and r (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009n) such that . In other words each wool sequence contains a subsequence of consecutive elements with xor equal to 0.The expression  means applying the operation of a bitwise xor to numbers x and y. The given operation exists in all modern programming languages, for example, in languages C++ and Java it is marked as \"^\", in Pascal \u2014 as \"xor\".In this problem you are asked to compute the number of sequences made of n integers from 0 to 2m\u2009-\u20091 that are not a wool sequence. You should print this number modulo 1000000009 (109\u2009+\u20099).", "input_spec": "The only line of input contains two space-separated integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009105).", "output_spec": "Print the required number of sequences modulo 1000000009 (109\u2009+\u20099) on the only line of output.", "sample_inputs": ["3 2"], "sample_outputs": ["6"], "notes": "NoteSequences of length 3 made of integers 0, 1, 2 and 3 that are not a wool sequence are (1, 3, 1), (1, 2, 1), (2, 1, 2), (2, 3, 2), (3, 1, 3) and (3, 2, 3)."}, "src_uid": "fef4d9c94a93fcf6d536f33503b1d4b8"}
{"nl": {"description": "The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: \"a\", \"ab\", \"abc\" etc. are prefixes of string \"{abcdef}\" but \"b\" and 'bc\" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: \"a\" and \"ab\" are alphabetically earlier than \"ac\" but \"b\" and \"ba\" are alphabetically later than \"ac\".", "input_spec": "The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive. ", "output_spec": "Output a single string\u00a0\u2014 alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.", "sample_inputs": ["harry potter", "tom riddle"], "sample_outputs": ["hap", "tomr"], "notes": null}, "src_uid": "aed892f2bda10b6aee10dcb834a63709"}
{"nl": {"description": "Moamen and Ezzat are playing a game. They create an array $$$a$$$ of $$$n$$$ non-negative integers where every element is less than $$$2^k$$$.Moamen wins if $$$a_1 \\,\\&\\, a_2 \\,\\&\\, a_3 \\,\\&\\, \\ldots \\,\\&\\, a_n \\ge a_1 \\oplus a_2 \\oplus a_3 \\oplus \\ldots \\oplus a_n$$$.Here $$$\\&$$$ denotes the bitwise AND operation, and $$$\\oplus$$$ denotes the bitwise XOR operation.Please calculate the number of winning for Moamen arrays $$$a$$$.As the result may be very large, print the value modulo $$$1\\,000\\,000\\,007$$$ ($$$10^9 + 7$$$).", "input_spec": "The first line contains a single integer $$$t$$$ ($$$1 \\le t \\le 5$$$)\u2014 the number of test cases.  Each test case consists of one line containing two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n\\le 2\\cdot 10^5$$$, $$$0 \\le k \\le 2\\cdot 10^5$$$).", "output_spec": "For each test case, print a single value \u2014 the number of different arrays that Moamen wins with. Print the result modulo $$$1\\,000\\,000\\,007$$$ ($$$10^9 + 7$$$).", "sample_inputs": ["3\n3 1\n2 1\n4 0"], "sample_outputs": ["5\n2\n1"], "notes": "NoteIn the first example, $$$n = 3$$$, $$$k = 1$$$. As a result, all the possible arrays are $$$[0,0,0]$$$, $$$[0,0,1]$$$, $$$[0,1,0]$$$, $$$[1,0,0]$$$, $$$[1,1,0]$$$, $$$[0,1,1]$$$, $$$[1,0,1]$$$, and $$$[1,1,1]$$$.Moamen wins in only $$$5$$$ of them: $$$[0,0,0]$$$, $$$[1,1,0]$$$, $$$[0,1,1]$$$, $$$[1,0,1]$$$, and $$$[1,1,1]$$$."}, "src_uid": "02f5fe43ea60939dd4a53299b5fa0881"}
{"nl": {"description": "Fox Ciel has a robot on a 2D plane. Initially it is located in (0, 0). Fox Ciel code a command to it. The command was represented by string s. Each character of s is one move operation. There are four move operations at all:  'U': go up, (x, y) \u2009\u2192\u2009 (x, y+1);  'D': go down, (x, y) \u2009\u2192\u2009 (x, y-1);  'L': go left, (x, y) \u2009\u2192\u2009 (x-1, y);  'R': go right, (x, y) \u2009\u2192\u2009 (x+1, y). The robot will do the operations in s from left to right, and repeat it infinite times. Help Fox Ciel to determine if after some steps the robot will located in (a,\u2009b).", "input_spec": "The first line contains two integers a and b, (\u2009-\u2009109\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109). The second line contains a string s (1\u2009\u2264\u2009|s|\u2009\u2264\u2009100, s only contains characters 'U', 'D', 'L', 'R') \u2014 the command.", "output_spec": "Print \"Yes\" if the robot will be located at (a,\u2009b), and \"No\" otherwise.", "sample_inputs": ["2 2\nRU", "1 2\nRU", "-1 1000000000\nLRRLU", "0 0\nD"], "sample_outputs": ["Yes", "No", "Yes", "Yes"], "notes": "NoteIn the first and second test case, command string is \"RU\", so the robot will go right, then go up, then right, and then up and so on.The locations of its moves are (0, 0) \u2009\u2192\u2009 (1, 0) \u2009\u2192\u2009 (1, 1) \u2009\u2192\u2009 (2, 1) \u2009\u2192\u2009 (2, 2) \u2009\u2192\u2009 ...So it can reach (2, 2) but not (1, 2)."}, "src_uid": "5d6212e28c7942e9ff4d096938b782bf"}
{"nl": {"description": "The translation from the Berland language into the Birland language is not an easy task. Those languages are very similar: a berlandish word differs from a birlandish word with the same meaning a little: it is spelled (and pronounced) reversely. For example, a Berlandish word code corresponds to a Birlandish word edoc. However, it's easy to make a mistake during the \u00abtranslation\u00bb. Vasya translated word s from Berlandish into Birlandish as t. Help him: find out if he translated the word correctly.", "input_spec": "The first line contains word s, the second line contains word t. The words consist of lowercase Latin letters. The input data do not consist unnecessary spaces. The words are not empty and their lengths do not exceed 100 symbols.", "output_spec": "If the word t is a word s, written reversely, print YES, otherwise print NO.", "sample_inputs": ["code\nedoc", "abb\naba", "code\ncode"], "sample_outputs": ["YES", "NO", "NO"], "notes": null}, "src_uid": "35a4be326690b58bf9add547fb63a5a5"}
{"nl": {"description": "Arkady owns a non-decreasing array $$$a_1, a_2, \\ldots, a_n$$$. You are jealous of its beauty and want to destroy this property. You have a so-called XOR-gun that you can use one or more times.In one step you can select two consecutive elements of the array, let's say $$$x$$$ and $$$y$$$, remove them from the array and insert the integer $$$x \\oplus y$$$ on their place, where $$$\\oplus$$$ denotes the bitwise XOR operation. Note that the length of the array decreases by one after the operation. You can't perform this operation when the length of the array reaches one.For example, if the array is $$$[2, 5, 6, 8]$$$, you can select $$$5$$$ and $$$6$$$ and replace them with $$$5 \\oplus 6 = 3$$$. The array becomes $$$[2, 3, 8]$$$.You want the array no longer be non-decreasing. What is the minimum number of steps needed? If the array stays non-decreasing no matter what you do, print $$$-1$$$.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$2 \\le n \\le 10^5$$$)\u00a0\u2014 the initial length of the array. The second line contains $$$n$$$ integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$1 \\le a_i \\le 10^9$$$)\u00a0\u2014 the elements of the array. It is guaranteed that $$$a_i \\le a_{i + 1}$$$ for all $$$1 \\le i < n$$$.", "output_spec": "Print a single integer\u00a0\u2014 the minimum number of steps needed. If there is no solution, print $$$-1$$$.", "sample_inputs": ["4\n2 5 6 8", "3\n1 2 3", "5\n1 2 4 6 20"], "sample_outputs": ["1", "-1", "2"], "notes": "NoteIn the first example you can select $$$2$$$ and $$$5$$$ and the array becomes $$$[7, 6, 8]$$$.In the second example you can only obtain arrays $$$[1, 1]$$$, $$$[3, 3]$$$ and $$$[0]$$$ which are all non-decreasing.In the third example you can select $$$1$$$ and $$$2$$$ and the array becomes $$$[3, 4, 6, 20]$$$. Then you can, for example, select $$$3$$$ and $$$4$$$ and the array becomes $$$[7, 6, 20]$$$, which is no longer non-decreasing."}, "src_uid": "51ad613842de8eff6226c97812118b61"}
{"nl": {"description": "A never-ending, fast-changing and dream-like world unfolds, as the secret door opens.A world is an unordered graph G, in whose vertex set V(G) there are two special vertices s(G) and t(G). An initial world has vertex set {s(G),\u2009t(G)} and an edge between them.A total of n changes took place in an initial world. In each change, a new vertex w is added into V(G), an existing edge (u,\u2009v) is chosen, and two edges (u,\u2009w) and (v,\u2009w) are added into E(G). Note that it's possible that some edges are chosen in more than one change.It's known that the capacity of the minimum s-t cut of the resulting graph is m, that is, at least m edges need to be removed in order to make s(G) and t(G) disconnected.Count the number of non-similar worlds that can be built under the constraints, modulo 109\u2009+\u20097. We define two worlds similar, if they are isomorphic and there is isomorphism in which the s and t vertices are not relabelled. Formally, two worlds G and H are considered similar, if there is a bijection between their vertex sets , such that:   f(s(G))\u2009=\u2009s(H);  f(t(G))\u2009=\u2009t(H);  Two vertices u and v of G are adjacent in G if and only if f(u) and f(v) are adjacent in H. ", "input_spec": "The first and only line of input contains two space-separated integers n, m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200950) \u2014 the number of operations performed and the minimum cut, respectively.", "output_spec": "Output one integer \u2014 the number of non-similar worlds that can be built, modulo 109\u2009+\u20097.", "sample_inputs": ["3 2", "4 4", "7 3", "31 8"], "sample_outputs": ["6", "3", "1196", "64921457"], "notes": "NoteIn the first example, the following 6 worlds are pairwise non-similar and satisfy the constraints, with s(G) marked in green, t(G) marked in blue, and one of their minimum cuts in light blue.  In the second example, the following 3 worlds satisfy the constraints.  "}, "src_uid": "aca6148effff8b893c961b1ee465e4e4"}
{"nl": {"description": "Furik and Rubik love playing computer games. Furik has recently found a new game that greatly interested Rubik. The game consists of n parts and to complete each part a player may probably need to complete some other ones. We know that the game can be fully completed, that is, its parts do not form cyclic dependencies. Rubik has 3 computers, on which he can play this game. All computers are located in different houses. Besides, it has turned out that each part of the game can be completed only on one of these computers. Let's number the computers with integers from 1 to 3. Rubik can perform the following actions:   Complete some part of the game on some computer. Rubik spends exactly 1 hour on completing any part on any computer.  Move from the 1-st computer to the 2-nd one. Rubik spends exactly 1 hour on that.  Move from the 1-st computer to the 3-rd one. Rubik spends exactly 2 hours on that.  Move from the 2-nd computer to the 1-st one. Rubik spends exactly 2 hours on that.  Move from the 2-nd computer to the 3-rd one. Rubik spends exactly 1 hour on that.  Move from the 3-rd computer to the 1-st one. Rubik spends exactly 1 hour on that.  Move from the 3-rd computer to the 2-nd one. Rubik spends exactly 2 hours on that. Help Rubik to find the minimum number of hours he will need to complete all parts of the game. Initially Rubik can be located at the computer he considers necessary. ", "input_spec": "The first line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009200) \u2014 the number of game parts. The next line contains n integers, the i-th integer \u2014 ci (1\u2009\u2264\u2009ci\u2009\u2264\u20093) represents the number of the computer, on which you can complete the game part number i.  Next n lines contain descriptions of game parts. The i-th line first contains integer ki (0\u2009\u2264\u2009ki\u2009\u2264\u2009n\u2009-\u20091), then ki distinct integers ai,\u2009j (1\u2009\u2264\u2009ai,\u2009j\u2009\u2264\u2009n;\u00a0ai,\u2009j\u2009\u2260\u2009i) \u2014 the numbers of parts to complete before part i. Numbers on all lines are separated by single spaces. You can assume that the parts of the game are numbered from 1 to n in some way. It is guaranteed that there are no cyclic dependencies between the parts of the game.", "output_spec": "On a single line print the answer to the problem.", "sample_inputs": ["1\n1\n0", "5\n2 2 1 1 3\n1 5\n2 5 1\n2 5 4\n1 5\n0"], "sample_outputs": ["1", "7"], "notes": "NoteNote to the second sample: before the beginning of the game the best strategy is to stand by the third computer. First we complete part 5. Then we go to the 1-st computer and complete parts 3 and 4. Then we go to the 2-nd computer and complete parts 1 and 2. In total we get 1+1+2+1+2, which equals 7 hours."}, "src_uid": "be42e213ff43e303e475d77a9560367f"}
{"nl": {"description": "In Omkar's last class of math, he learned about the least common multiple, or $$$LCM$$$. $$$LCM(a, b)$$$ is the smallest positive integer $$$x$$$ which is divisible by both $$$a$$$ and $$$b$$$.Omkar, having a laudably curious mind, immediately thought of a problem involving the $$$LCM$$$ operation: given an integer $$$n$$$, find positive integers $$$a$$$ and $$$b$$$ such that $$$a + b = n$$$ and $$$LCM(a, b)$$$ is the minimum value possible.Can you help Omkar solve his ludicrously challenging math problem?", "input_spec": "Each test contains multiple test cases. The first line contains the number of test cases $$$t$$$ ($$$1 \\leq t \\leq 10$$$). Description of the test cases follows. Each test case consists of a single integer $$$n$$$ ($$$2 \\leq n \\leq 10^{9}$$$).", "output_spec": "For each test case, output two positive integers $$$a$$$ and $$$b$$$, such that $$$a + b = n$$$ and $$$LCM(a, b)$$$ is the minimum possible.", "sample_inputs": ["3\n4\n6\n9"], "sample_outputs": ["2 2\n3 3\n3 6"], "notes": "NoteFor the first test case, the numbers we can choose are $$$1, 3$$$ or $$$2, 2$$$. $$$LCM(1, 3) = 3$$$ and $$$LCM(2, 2) = 2$$$, so we output $$$2 \\ 2$$$.For the second test case, the numbers we can choose are $$$1, 5$$$, $$$2, 4$$$, or $$$3, 3$$$. $$$LCM(1, 5) = 5$$$, $$$LCM(2, 4) = 4$$$, and $$$LCM(3, 3) = 3$$$, so we output $$$3 \\ 3$$$.For the third test case, $$$LCM(3, 6) = 6$$$. It can be shown that there are no other pairs of numbers which sum to $$$9$$$ that have a lower $$$LCM$$$."}, "src_uid": "3fd60db24b1873e906d6dee9c2508ac5"}
{"nl": {"description": "You have a rectangular board of size $$$n\\times m$$$ ($$$n$$$ rows, $$$m$$$ columns). The $$$n$$$ rows are numbered from $$$1$$$ to $$$n$$$ from top to bottom, and the $$$m$$$ columns are numbered from $$$1$$$ to $$$m$$$ from left to right. The cell at the intersection of row $$$i$$$ and column $$$j$$$ contains the number $$$i^j$$$ ($$$i$$$ raised to the power of $$$j$$$). For example, if $$$n=3$$$ and $$$m=3$$$ the board is as follows:  Find the number of distinct integers written on the board.", "input_spec": "The only line contains two integers $$$n$$$ and $$$m$$$ ($$$1\\le n,m\\le 10^6$$$)\u00a0\u2014 the number of rows and columns of the board.", "output_spec": "Print one integer, the number of distinct integers on the board.", "sample_inputs": ["3 3", "2 4", "4 2"], "sample_outputs": ["7", "5", "6"], "notes": "NoteThe statement shows the board for the first test case. In this case there are $$$7$$$ distinct integers: $$$1$$$, $$$2$$$, $$$3$$$, $$$4$$$, $$$8$$$, $$$9$$$, and $$$27$$$.In the second test case, the board is as follows:  There are $$$5$$$ distinct numbers: $$$1$$$, $$$2$$$, $$$4$$$, $$$8$$$ and $$$16$$$.In the third test case, the board is as follows:  There are $$$6$$$ distinct numbers: $$$1$$$, $$$2$$$, $$$3$$$, $$$4$$$, $$$9$$$ and $$$16$$$."}, "src_uid": "6ca310cb0b6fc4e62e63a731cd55aead"}
{"nl": {"description": "Let\u2019s define a grid to be a set of tiles with 2 rows and 13 columns. Each tile has an English letter written in it. The letters don't have to be unique: there might be two or more tiles with the same letter written on them. Here is an example of a grid: ABCDEFGHIJKLMNOPQRSTUVWXYZ We say that two tiles are adjacent if they share a side or a corner. In the example grid above, the tile with the letter 'A' is adjacent only to the tiles with letters 'B', 'N', and 'O'. A tile is not adjacent to itself.A sequence of tiles is called a path if each tile in the sequence is adjacent to the tile which follows it (except for the last tile in the sequence, which of course has no successor). In this example, \"ABC\" is a path, and so is \"KXWIHIJK\". \"MAB\" is not a path because 'M' is not adjacent to 'A'. A single tile can be used more than once by a path (though the tile cannot occupy two consecutive places in the path because no tile is adjacent to itself).You\u2019re given a string s which consists of 27 upper-case English letters. Each English letter occurs at least once in s. Find a grid that contains a path whose tiles, viewed in the order that the path visits them, form the string s. If there\u2019s no solution, print \"Impossible\" (without the quotes).", "input_spec": "The only line of the input contains the string s, consisting of 27 upper-case English letters. Each English letter occurs at least once in s.", "output_spec": "Output two lines, each consisting of 13 upper-case English characters, representing the rows of the grid. If there are multiple solutions, print any of them. If there is no solution print \"Impossible\".", "sample_inputs": ["ABCDEFGHIJKLMNOPQRSGTUVWXYZ", "BUVTYZFQSNRIWOXXGJLKACPEMDH"], "sample_outputs": ["YXWVUTGHIJKLM\nZABCDEFSRQPON", "Impossible"], "notes": null}, "src_uid": "56c5ea443dec7a732802b16aed5b934d"}
{"nl": {"description": "Vasya has recently learned to type and log on to the Internet. He immediately entered a chat room and decided to say hello to everybody. Vasya typed the word s. It is considered that Vasya managed to say hello if several letters can be deleted from the typed word so that it resulted in the word \"hello\". For example, if Vasya types the word \"ahhellllloou\", it will be considered that he said hello, and if he types \"hlelo\", it will be considered that Vasya got misunderstood and he didn't manage to say hello. Determine whether Vasya managed to say hello by the given word s.", "input_spec": "The first and only line contains the word s, which Vasya typed. This word consisits of small Latin letters, its length is no less that 1 and no more than 100 letters.", "output_spec": "If Vasya managed to say hello, print \"YES\", otherwise print \"NO\".", "sample_inputs": ["ahhellllloou", "hlelo"], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "c5d19dc8f2478ee8d9cba8cc2e4cd838"}
{"nl": {"description": "The only difference between easy and hard versions is on constraints. In this version constraints are lower. You can make hacks only if all versions of the problem are solved.Koa the Koala is at the beach!The beach consists (from left to right) of a shore, $$$n+1$$$ meters of sea and an island at $$$n+1$$$ meters from the shore.She measured the depth of the sea at $$$1, 2, \\dots, n$$$ meters from the shore and saved them in array $$$d$$$. $$$d_i$$$ denotes the depth of the sea at $$$i$$$ meters from the shore for $$$1 \\le i \\le n$$$.Like any beach this one has tide, the intensity of the tide is measured by parameter $$$k$$$ and affects all depths from the beginning at time $$$t=0$$$ in the following way:  For a total of $$$k$$$ seconds, each second, tide increases all depths by $$$1$$$.  Then, for a total of $$$k$$$ seconds, each second, tide decreases all depths by $$$1$$$.  This process repeats again and again (ie. depths increase for $$$k$$$ seconds then decrease for $$$k$$$ seconds and so on ...).Formally, let's define $$$0$$$-indexed array $$$p = [0, 1, 2, \\ldots, k - 2, k - 1, k, k - 1, k - 2, \\ldots, 2, 1]$$$ of length $$$2k$$$. At time $$$t$$$ ($$$0 \\le t$$$) depth at $$$i$$$ meters from the shore equals $$$d_i + p[t \\bmod 2k]$$$ ($$$t \\bmod 2k$$$ denotes the remainder of the division of $$$t$$$ by $$$2k$$$). Note that the changes occur instantaneously after each second, see the notes for better understanding. At time $$$t=0$$$ Koa is standing at the shore and wants to get to the island. Suppose that at some time $$$t$$$ ($$$0 \\le t$$$) she is at $$$x$$$ ($$$0 \\le x \\le n$$$) meters from the shore:  In one second Koa can swim $$$1$$$ meter further from the shore ($$$x$$$ changes to $$$x+1$$$) or not swim at all ($$$x$$$ stays the same), in both cases $$$t$$$ changes to $$$t+1$$$.  As Koa is a bad swimmer, the depth of the sea at the point where she is can't exceed $$$l$$$ at integer points of time (or she will drown). More formally, if Koa is at $$$x$$$ ($$$1 \\le x \\le n$$$) meters from the shore at the moment $$$t$$$ (for some integer $$$t\\ge 0$$$), the depth of the sea at this point \u00a0\u2014 $$$d_x + p[t \\bmod 2k]$$$ \u00a0\u2014 can't exceed $$$l$$$. In other words, $$$d_x + p[t \\bmod 2k] \\le l$$$ must hold always.  Once Koa reaches the island at $$$n+1$$$ meters from the shore, she stops and can rest.Note that while Koa swims tide doesn't have effect on her (ie. she can't drown while swimming). Note that Koa can choose to stay on the shore for as long as she needs and neither the shore or the island are affected by the tide (they are solid ground and she won't drown there). Koa wants to know whether she can go from the shore to the island. Help her!", "input_spec": "The first line of the input contains one integer $$$t$$$ ($$$1 \\le t \\le 100$$$) \u00a0\u2014 the number of test cases. Description of the test cases follows. The first line of each test case contains three integers $$$n$$$, $$$k$$$ and $$$l$$$ ($$$1 \\le n \\le 100; 1 \\le k \\le 100; 1 \\le l \\le 100$$$)\u00a0\u2014 the number of meters of sea Koa measured and parameters $$$k$$$ and $$$l$$$. The second line of each test case contains $$$n$$$ integers $$$d_1, d_2, \\ldots, d_n$$$ ($$$0 \\le d_i \\le 100$$$) \u00a0\u2014 the depths of each meter of sea Koa measured. It is guaranteed that the sum of $$$n$$$ over all test cases does not exceed $$$100$$$.", "output_spec": "For each test case: Print Yes if Koa can get from the shore to the island, and No otherwise. You may print each letter in any case (upper or lower).", "sample_inputs": ["7\n2 1 1\n1 0\n5 2 3\n1 2 3 2 2\n4 3 4\n0 2 4 3\n2 3 5\n3 0\n7 2 3\n3 0 2 1 3 0 1\n7 1 4\n4 4 3 0 2 4 2\n5 2 3\n1 2 3 2 2"], "sample_outputs": ["Yes\nNo\nYes\nYes\nYes\nNo\nNo"], "notes": "NoteIn the following $$$s$$$ denotes the shore, $$$i$$$ denotes the island, $$$x$$$ denotes distance from Koa to the shore, the underline denotes the position of Koa, and values in the array below denote current depths, affected by tide, at $$$1, 2, \\dots, n$$$ meters from the shore.In test case $$$1$$$ we have $$$n = 2, k = 1, l = 1, p = [ 0, 1 ]$$$.Koa wants to go from shore (at $$$x = 0$$$) to the island (at $$$x = 3$$$). Let's describe a possible solution:  Initially at $$$t = 0$$$ the beach looks like this: $$$[\\underline{s}, 1, 0, i]$$$.  At $$$t = 0$$$ if Koa would decide to swim to $$$x = 1$$$, beach would look like: $$$[s, \\underline{2}, 1, i]$$$ at $$$t = 1$$$, since $$$2 > 1$$$ she would drown. So Koa waits $$$1$$$ second instead and beach looks like $$$[\\underline{s}, 2, 1, i]$$$ at $$$t = 1$$$.  At $$$t = 1$$$ Koa swims to $$$x = 1$$$, beach looks like $$$[s, \\underline{1}, 0, i]$$$ at $$$t = 2$$$. Koa doesn't drown because $$$1 \\le 1$$$.  At $$$t = 2$$$ Koa swims to $$$x = 2$$$, beach looks like $$$[s, 2, \\underline{1}, i]$$$ at $$$t = 3$$$. Koa doesn't drown because $$$1 \\le 1$$$.  At $$$t = 3$$$ Koa swims to $$$x = 3$$$, beach looks like $$$[s, 1, 0, \\underline{i}]$$$ at $$$t = 4$$$.  At $$$t = 4$$$ Koa is at $$$x = 3$$$ and she made it! We can show that in test case $$$2$$$ Koa can't get to the island."}, "src_uid": "4941b0a365f86b2e2cf686cdf5d532f8"}
{"nl": {"description": "Tattah is asleep if and only if Tattah is attending a lecture. This is a well-known formula among Tattah's colleagues.On a Wednesday afternoon, Tattah was attending Professor HH's lecture. At 12:21, right before falling asleep, he was staring at the digital watch around Saher's wrist. He noticed that the digits on the clock were the same when read from both directions i.e. a palindrome.In his sleep, he started dreaming about such rare moments of the day when the time displayed on a digital clock is a palindrome. As soon as he woke up, he felt destined to write a program that finds the next such moment.However, he still hasn't mastered the skill of programming while sleeping, so your task is to help him.", "input_spec": "The first and only line of the input starts with a string with the format \"HH:MM\" where \"HH\" is from \"00\" to \"23\" and \"MM\" is from \"00\" to \"59\". Both \"HH\" and \"MM\" have exactly two digits.", "output_spec": "Print the palindromic time of day that comes soonest after the time given in the input. If the input time is palindromic, output the soonest palindromic time after the input time.", "sample_inputs": ["12:21", "23:59"], "sample_outputs": ["13:31", "00:00"], "notes": null}, "src_uid": "158eae916daa3e0162d4eac0426fa87f"}
{"nl": {"description": "Johny likes numbers n and k very much. Now Johny wants to find the smallest integer x greater than n, so it is divisible by the number k.", "input_spec": "The only line contains two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u2009109).", "output_spec": "Print the smallest integer x\u2009>\u2009n, so it is divisible by the number k.", "sample_inputs": ["5 3", "25 13", "26 13"], "sample_outputs": ["6", "26", "39"], "notes": null}, "src_uid": "75f3835c969c871a609b978e04476542"}
{"nl": {"description": "There is unrest in the Galactic Senate. Several thousand solar systems have declared their intentions to leave the Republic. Master Heidi needs to select the Jedi Knights who will go on peacekeeping missions throughout the galaxy. It is well-known that the success of any peacekeeping mission depends on the colors of the lightsabers of the Jedi who will go on that mission. Heidi has n Jedi Knights standing in front of her, each one with a lightsaber of one of m possible colors. She knows that for the mission to be the most effective, she needs to select some contiguous interval of knights such that there are exactly k1 knights with lightsabers of the first color, k2 knights with lightsabers of the second color, ..., km knights with lightsabers of the m-th color. Help her find out if this is possible.", "input_spec": "The first line of the input contains n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) and m (1\u2009\u2264\u2009m\u2009\u2264\u2009n). The second line contains n integers in the range {1,\u20092,\u2009...,\u2009m} representing colors of the lightsabers of the subsequent Jedi Knights. The third line contains m integers k1,\u2009k2,\u2009...,\u2009km (with ) \u2013 the desired counts of lightsabers of each color from 1 to m.", "output_spec": "Output YES if an interval with prescribed color counts exists, or output NO if there is none.", "sample_inputs": ["5 2\n1 1 2 2 1\n1 2"], "sample_outputs": ["YES"], "notes": null}, "src_uid": "59f40d9f35e5fe402112214b42b682b5"}
{"nl": {"description": "You are given integers $$$d$$$ and $$$p$$$, $$$p$$$ is prime. Also you have a mysterious device. It has memory cells, each contains an integer between $$$0$$$ and $$$p-1$$$. Also two instructions are supported, addition and raising to the $$$d$$$-th power. $$$\\textbf{Both are modulo}$$$ $$$p$$$.The memory cells are numbered $$$1, 2, \\dots, 5000$$$. Initially cells $$$1$$$ and $$$2$$$ contain integers $$$x$$$ and $$$y$$$, respectively ($$$0 \\leqslant x, y \\leq p - 1$$$). All other cells contain $$$\\textbf{1}$$$s. You can not directly access values in cells, and you $$$\\textbf{don't know}$$$ values of $$$x$$$ and $$$y$$$ (but you know they are written in first two cells). You mission, should you choose to accept it, is to write a program using the available instructions to obtain the product $$$xy$$$ modulo $$$p$$$ in one of the cells. You program should work for all possible $$$x$$$ and $$$y$$$.Addition instruction evaluates sum of values in two cells and writes it to third cell. This instruction is encoded by a string \"+ e1 e2 to\", which writes sum of values in cells e1 and e2 into cell to. Any values of e1, e2, to can coincide. Second instruction writes the $$$d$$$-th power of a value in some cell to the target cell. This instruction is encoded by a string \"^ e to\". Values e and to can coincide, in this case value in the cell will be overwritten. Last instruction is special, this is the return instruction, and it is encoded by a string \"f target\". This means you obtained values $$$xy \\bmod p$$$ in the cell target. No instructions should be called after this instruction.Provide a program that obtains $$$xy \\bmod p$$$ and uses no more than $$$5000$$$ instructions (including the return instruction).It is guaranteed that, under given constrains, a solution exists. ", "input_spec": "The first line contains space-separated integers $$$d$$$ and $$$p$$$ ($$$2 \\leqslant d \\leqslant 10$$$, $$$d < p$$$, $$$3 \\leqslant p \\leqslant 10^9 + 9$$$, $$$p$$$ is prime).", "output_spec": "Output instructions, one instruction per line in the above format. There should be no more than $$$5000$$$ lines, and the last line should be the return instruction.", "sample_inputs": [], "sample_outputs": [], "notes": "NoteThis problem has no sample tests. A sample output is shown below. Note that this output is not supposed to be a solution to any testcase, and is there purely to illustrate the output format.$$$\\texttt{+ 1 1 3}\\\\ \\texttt{^ 3 3}\\\\ \\texttt{+ 3 2 2}\\\\ \\texttt{+ 3 2 3}\\\\ \\texttt{^ 3 1}\\\\ \\texttt{f 1}$$$Here's a step-by-step runtime illustration:$$$\\begin{array}{|c|c|c|c|} \\hline \\texttt{} & \\text{cell 1} & \\text{cell 2} & \\text{cell 3} \\\\\\hline \\text{initially} & x & y & 1 \\\\ \\hline \\texttt{+ 1 1 3} & x & y & 2x \\\\ \\hline\\texttt{^ 3 3} & x & y & (2x)^d \\\\ \\hline\\texttt{+ 3 2 2} & x & y + (2x)^d & (2x)^d \\\\ \\hline\\texttt{+ 3 2 3} & x & y + (2x)^d & y + 2\\cdot(2x)^d \\\\ \\hline\\texttt{^ 3 1} & (y + 2\\cdot(2x)^d)^d & y + (2x)^d & y + 2\\cdot(2x)^d \\\\ \\hline\\end{array}$$$Suppose that $$$d = 2$$$ and $$$p = 3$$$. Since for $$$x = 0$$$ and $$$y = 1$$$ the returned result is $$$1 \\neq 0 \\cdot 1 \\bmod 3$$$, this program would be judged as incorrect."}, "src_uid": "bbdc2a3d58f5229d7e9b67e4de70067f"}
{"nl": {"description": "Polycarpus loves hamburgers very much. He especially adores the hamburgers he makes with his own hands. Polycarpus thinks that there are only three decent ingredients to make hamburgers from: a bread, sausage and cheese. He writes down the recipe of his favorite \"Le Hamburger de Polycarpus\" as a string of letters 'B' (bread), 'S' (sausage) \u0438 'C' (cheese). The ingredients in the recipe go from bottom to top, for example, recipe \"\u0412SCBS\" represents the hamburger where the ingredients go from bottom to top as bread, sausage, cheese, bread and sausage again.Polycarpus has nb pieces of bread, ns pieces of sausage and nc pieces of cheese in the kitchen. Besides, the shop nearby has all three ingredients, the prices are pb rubles for a piece of bread, ps for a piece of sausage and pc for a piece of cheese.Polycarpus has r rubles and he is ready to shop on them. What maximum number of hamburgers can he cook? You can assume that Polycarpus cannot break or slice any of the pieces of bread, sausage or cheese. Besides, the shop has an unlimited number of pieces of each ingredient.", "input_spec": "The first line of the input contains a non-empty string that describes the recipe of \"Le Hamburger de Polycarpus\". The length of the string doesn't exceed 100, the string contains only letters 'B' (uppercase English B), 'S' (uppercase English S) and 'C' (uppercase English C). The second line contains three integers nb, ns, nc (1\u2009\u2264\u2009nb,\u2009ns,\u2009nc\u2009\u2264\u2009100) \u2014 the number of the pieces of bread, sausage and cheese on Polycarpus' kitchen. The third line contains three integers pb, ps, pc (1\u2009\u2264\u2009pb,\u2009ps,\u2009pc\u2009\u2264\u2009100) \u2014 the price of one piece of bread, sausage and cheese in the shop. Finally, the fourth line contains integer r (1\u2009\u2264\u2009r\u2009\u2264\u20091012) \u2014 the number of rubles Polycarpus has. Please, do not write the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "Print the maximum number of hamburgers Polycarpus can make. If he can't make any hamburger, print 0.", "sample_inputs": ["BBBSSC\n6 4 1\n1 2 3\n4", "BBC\n1 10 1\n1 10 1\n21", "BSC\n1 1 1\n1 1 3\n1000000000000"], "sample_outputs": ["2", "7", "200000000001"], "notes": null}, "src_uid": "8126a4232188ae7de8e5a7aedea1a97e"}
{"nl": {"description": "There are n boys and m girls attending a theatre club. To set a play \"The Big Bang Theory\", they need to choose a group containing exactly t actors containing no less than 4 boys and no less than one girl. How many ways are there to choose a group? Of course, the variants that only differ in the composition of the troupe are considered different.Perform all calculations in the 64-bit type: long long for \u0421/\u0421++, int64 for Delphi and long for Java.", "input_spec": "The only line of the input data contains three integers n, m, t (4\u2009\u2264\u2009n\u2009\u2264\u200930,\u20091\u2009\u2264\u2009m\u2009\u2264\u200930,\u20095\u2009\u2264\u2009t\u2009\u2264\u2009n\u2009+\u2009m).", "output_spec": "Find the required number of ways. Please do not use the %lld specificator to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specificator.", "sample_inputs": ["5 2 5", "4 3 5"], "sample_outputs": ["10", "3"], "notes": null}, "src_uid": "489e69c7a2fba5fac34e89d7388ed4b8"}
{"nl": {"description": "Mr. Chanek has an integer represented by a string $$$s$$$. Zero or more digits have been erased and are denoted by the character _. There are also zero or more digits marked by the character X, meaning they're the same digit.Mr. Chanek wants to count the number of possible integer $$$s$$$, where $$$s$$$ is divisible by $$$25$$$. Of course, $$$s$$$ must not contain any leading zero. He can replace the character _ with any digit. He can also replace the character X with any digit, but it must be the same for every character X.As a note, a leading zero is any 0 digit that comes before the first nonzero digit in a number string in positional notation. For example, 0025 has two leading zeroes. An exception is the integer zero, (0 has no leading zero, but 0000 has three leading zeroes).", "input_spec": "One line containing the string $$$s$$$ ($$$1 \\leq |s| \\leq 8$$$). The string $$$s$$$ consists of the characters 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, _, and X.", "output_spec": "Output an integer denoting the number of possible integer $$$s$$$.", "sample_inputs": ["25", "_00", "_XX", "0", "0_25"], "sample_outputs": ["1", "9", "9", "1", "0"], "notes": "NoteIn the first example, the only possible $$$s$$$ is $$$25$$$.In the second and third example, $$$s \\in \\{100, 200,300,400,500,600,700,800,900\\}$$$.In the fifth example, all possible $$$s$$$ will have at least one leading zero."}, "src_uid": "4a905f419550a6c839992b40f1617af3"}
{"nl": {"description": "Bran and his older sister Arya are from the same house. Bran like candies so much, so Arya is going to give him some Candies.At first, Arya and Bran have 0 Candies. There are n days, at the i-th day, Arya finds ai candies in a box, that is given by the Many-Faced God. Every day she can give Bran at most 8 of her candies. If she don't give him the candies at the same day, they are saved for her and she can give them to him later.Your task is to find the minimum number of days Arya needs to give Bran k candies before the end of the n-th day. Formally, you need to output the minimum day index to the end of which k candies will be given out (the days are indexed from 1 to n).Print -1 if she can't give him k candies during n given days.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009k\u2009\u2264\u200910000). The second line contains n integers a1,\u2009a2,\u2009a3,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009100).", "output_spec": "If it is impossible for Arya to give Bran k candies within n days, print -1. Otherwise print a single integer\u00a0\u2014 the minimum number of days Arya needs to give Bran k candies before the end of the n-th day.", "sample_inputs": ["2 3\n1 2", "3 17\n10 10 10", "1 9\n10"], "sample_outputs": ["2", "3", "-1"], "notes": "NoteIn the first sample, Arya can give Bran 3 candies in 2 days.In the second sample, Arya can give Bran 17 candies in 3 days, because she can give him at most 8 candies per day.In the third sample, Arya can't give Bran 9 candies, because she can give him at most 8 candies per day and she must give him the candies within 1 day."}, "src_uid": "24695b6a2aa573e90f0fe661b0c0bd3a"}
{"nl": {"description": "Your friend has n cards.You know that each card has a lowercase English letter on one side and a digit on the other.Currently, your friend has laid out the cards on a table so only one side of each card is visible.You would like to know if the following statement is true for cards that your friend owns: \"If a card has a vowel on one side, then it has an even digit on the other side.\" More specifically, a vowel is one of 'a', 'e', 'i', 'o' or 'u', and even digit is one of '0', '2', '4', '6' or '8'.For example, if a card has 'a' on one side, and '6' on the other side, then this statement is true for it. Also, the statement is true, for example, for a card with 'b' and '4', and for a card with 'b' and '3' (since the letter is not a vowel). The statement is false, for example, for card with 'e' and '5'. You are interested if the statement is true for all cards. In particular, if no card has a vowel, the statement is true.To determine this, you can flip over some cards to reveal the other side. You would like to know what is the minimum number of cards you need to flip in the worst case in order to verify that the statement is true.", "input_spec": "The first and only line of input will contain a string s (1\u2009\u2264\u2009|s|\u2009\u2264\u200950), denoting the sides of the cards that you can see on the table currently. Each character of s is either a lowercase English letter or a digit.", "output_spec": "Print a single integer, the minimum number of cards you must turn over to verify your claim.", "sample_inputs": ["ee", "z", "0ay1"], "sample_outputs": ["2", "0", "2"], "notes": "NoteIn the first sample, we must turn over both cards. Note that even though both cards have the same letter, they could possibly have different numbers on the other side.In the second sample, we don't need to turn over any cards. The statement is vacuously true, since you know your friend has no cards with a vowel on them.In the third sample, we need to flip the second and fourth cards."}, "src_uid": "b4af2b8a7e9844bf58ad3410c2cb5223"}
{"nl": {"description": "Dr. Evil kidnapped Mahmoud and Ehab in the evil land because of their performance in the Evil Olympiad in Informatics (EOI). He decided to give them some problems to let them go.Dr. Evil is interested in sets, He has a set of n integers. Dr. Evil calls a set of integers evil if the MEX of it is exactly x. the MEX of a set of integers is the minimum non-negative integer that doesn't exist in it. For example, the MEX of the set {0,\u20092,\u20094} is 1 and the MEX of the set {1,\u20092,\u20093} is 0 .Dr. Evil is going to make his set evil. To do this he can perform some operations. During each operation he can add some non-negative integer to his set or erase some element from it. What is the minimal number of operations Dr. Evil has to perform to make his set evil?", "input_spec": "The first line contains two integers n and x (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 0\u2009\u2264\u2009x\u2009\u2264\u2009100)\u00a0\u2014 the size of the set Dr. Evil owns, and the desired MEX. The second line contains n distinct non-negative integers not exceeding 100 that represent the set.", "output_spec": "The only line should contain one integer\u00a0\u2014 the minimal number of operations Dr. Evil should perform.", "sample_inputs": ["5 3\n0 4 5 6 7", "1 0\n0", "5 0\n1 2 3 4 5"], "sample_outputs": ["2", "1", "0"], "notes": "NoteFor the first test case Dr. Evil should add 1 and 2 to the set performing 2 operations.For the second test case Dr. Evil should erase 0 from the set. After that, the set becomes empty, so the MEX of it is 0.In the third test case the set is already evil."}, "src_uid": "21f579ba807face432a7664091581cd8"}
{"nl": {"description": "Recently Anton found a box with digits in his room. There are k2 digits 2, k3 digits 3, k5 digits 5 and k6 digits 6.Anton's favorite integers are 32 and 256. He decided to compose this integers from digits he has. He wants to make the sum of these integers as large as possible. Help him solve this task!Each digit can be used no more than once, i.e. the composed integers should contain no more than k2 digits 2, k3 digits 3 and so on. Of course, unused digits are not counted in the sum.", "input_spec": "The only line of the input contains four integers k2, k3, k5 and k6\u00a0\u2014 the number of digits 2, 3, 5 and 6 respectively (0\u2009\u2264\u2009k2,\u2009k3,\u2009k5,\u2009k6\u2009\u2264\u20095\u00b7106).", "output_spec": "Print one integer\u00a0\u2014 maximum possible sum of Anton's favorite integers that can be composed using digits from the box.", "sample_inputs": ["5 1 3 4", "1 1 1 1"], "sample_outputs": ["800", "256"], "notes": "NoteIn the first sample, there are five digits 2, one digit 3, three digits 5 and four digits 6. Anton can compose three integers 256 and one integer 32 to achieve the value 256\u2009+\u2009256\u2009+\u2009256\u2009+\u200932\u2009=\u2009800. Note, that there is one unused integer 2 and one unused integer 6. They are not counted in the answer.In the second sample, the optimal answer is to create on integer 256, thus the answer is 256."}, "src_uid": "082b31cc156a7ba1e0a982f07ecc207e"}
{"nl": {"description": "You are locked in a room with a door that has a keypad with 10 keys corresponding to digits from 0 to 9. To escape from the room, you need to enter a correct code. You also have a sequence of digits.Some keys on the keypad have fingerprints. You believe the correct code is the longest not necessarily contiguous subsequence of the sequence you have that only contains digits with fingerprints on the corresponding keys. Find such code.", "input_spec": "The first line contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n, m \\le 10$$$) representing the number of digits in the sequence you have and the number of keys on the keypad that have fingerprints. The next line contains $$$n$$$ distinct space-separated integers $$$x_1, x_2, \\ldots, x_n$$$ ($$$0 \\le x_i \\le 9$$$) representing the sequence. The next line contains $$$m$$$ distinct space-separated integers $$$y_1, y_2, \\ldots, y_m$$$ ($$$0 \\le y_i \\le 9$$$) \u2014 the keys with fingerprints.", "output_spec": "In a single line print a space-separated sequence of integers representing the code. If the resulting sequence is empty, both printing nothing and printing a single line break is acceptable.", "sample_inputs": ["7 3\n3 5 7 1 6 2 8\n1 2 7", "4 4\n3 4 1 0\n0 1 7 9"], "sample_outputs": ["7 1 2", "1 0"], "notes": "NoteIn the first example, the only digits with fingerprints are $$$1$$$, $$$2$$$ and $$$7$$$. All three of them appear in the sequence you know, $$$7$$$ first, then $$$1$$$ and then $$$2$$$. Therefore the output is 7 1 2. Note that the order is important, and shall be the same as the order in the original sequence.In the second example digits $$$0$$$, $$$1$$$, $$$7$$$ and $$$9$$$ have fingerprints, however only $$$0$$$ and $$$1$$$ appear in the original sequence. $$$1$$$ appears earlier, so the output is 1 0. Again, the order is important."}, "src_uid": "f9044a4b4c3a0c2751217d9b31cd0c72"}
{"nl": {"description": "A lot of people associate Logo programming language with turtle graphics. In this case the turtle moves along the straight line and accepts commands \"T\" (\"turn around\") and \"F\" (\"move 1 unit forward\").You are given a list of commands that will be given to the turtle. You have to change exactly n commands from the list (one command can be changed several times). How far from the starting point can the turtle move after it follows all the commands of the modified list?", "input_spec": "The first line of input contains a string commands \u2014 the original list of commands. The string commands contains between 1 and 100 characters, inclusive, and contains only characters \"T\" and \"F\". The second line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950) \u2014 the number of commands you have to change in the list.", "output_spec": "Output the maximum distance from the starting point to the ending point of the turtle's path. The ending point of the turtle's path is turtle's coordinate after it follows all the commands of the modified list.", "sample_inputs": ["FT\n1", "FFFTFFF\n2"], "sample_outputs": ["2", "6"], "notes": "NoteIn the first example the best option is to change the second command (\"T\") to \"F\" \u2014 this way the turtle will cover a distance of 2 units.In the second example you have to change two commands. One of the ways to cover maximal distance of 6 units is to change the fourth command and first or last one."}, "src_uid": "4a54971eb22e62b1d9e6b72f05ae361d"}
{"nl": {"description": "Polycarp is crazy about round numbers. He especially likes the numbers divisible by 10k.In the given number of n Polycarp wants to remove the least number of digits to get a number that is divisible by 10k. For example, if k\u2009=\u20093, in the number 30020 it is enough to delete a single digit (2). In this case, the result is 3000 that is divisible by 103\u2009=\u20091000.Write a program that prints the minimum number of digits to be deleted from the given integer number n, so that the result is divisible by 10k. The result should not start with the unnecessary leading zero (i.e., zero can start only the number 0, which is required to be written as exactly one digit).It is guaranteed that the answer exists.", "input_spec": "The only line of the input contains two integer numbers n and k (0\u2009\u2264\u2009n\u2009\u2264\u20092\u2009000\u2009000\u2009000, 1\u2009\u2264\u2009k\u2009\u2264\u20099). It is guaranteed that the answer exists. All numbers in the input are written in traditional notation of integers, that is, without any extra leading zeros.", "output_spec": "Print w \u2014 the required minimal number of digits to erase. After removing the appropriate w digits from the number n, the result should have a value that is divisible by 10k. The result can start with digit 0 in the single case (the result is zero and written by exactly the only digit 0).", "sample_inputs": ["30020 3", "100 9", "10203049 2"], "sample_outputs": ["1", "2", "3"], "notes": "NoteIn the example 2 you can remove two digits: 1 and any 0. The result is number 0 which is divisible by any number."}, "src_uid": "7a8890417aa48c2b93b559ca118853f9"}
{"nl": {"description": "Do you remember how Kai constructed the word \"eternity\" using pieces of ice as components?Little Sheldon plays with pieces of ice, each piece has exactly one digit between 0 and 9. He wants to construct his favourite number t. He realized that digits 6 and 9 are very similar, so he can rotate piece of ice with 6 to use as 9 (and vice versa). Similary, 2 and 5 work the same. There is no other pair of digits with similar effect. He called this effect \"Digital Mimicry\".Sheldon favourite number is t. He wants to have as many instances of t as possible. How many instances he can construct using the given sequence of ice pieces. He can use any piece at most once. ", "input_spec": "The first line contains integer t (1\u2009\u2264\u2009t\u2009\u2264\u200910000). The second line contains the sequence of digits on the pieces. The length of line is equal to the number of pieces and between 1 and 200, inclusive. It contains digits between 0 and 9.", "output_spec": "Print the required number of instances.", "sample_inputs": ["42\n23454", "169\n12118999"], "sample_outputs": ["2", "1"], "notes": "NoteThis problem contains very weak pretests."}, "src_uid": "72a196044787cb8dbd8d350cb60ccc32"}
{"nl": {"description": "Vasya has recently finished writing a book. Now he faces the problem of giving it the title. Vasya wants the title to be vague and mysterious for his book to be noticeable among others. That's why the title should be represented by a single word containing at least once each of the first k Latin letters and not containing any other ones. Also, the title should be a palindrome, that is it should be read similarly from the left to the right and from the right to the left.Vasya has already composed the approximate variant of the title. You are given the title template s consisting of lowercase Latin letters and question marks. Your task is to replace all the question marks by lowercase Latin letters so that the resulting word satisfies the requirements, described above. Each question mark should be replaced by exactly one letter, it is not allowed to delete characters or add new ones to the template. If there are several suitable titles, choose the first in the alphabetical order, for Vasya's book to appear as early as possible in all the catalogues.", "input_spec": "The first line contains an integer k (1\u2009\u2264\u2009k\u2009\u2264\u200926) which is the number of allowed alphabet letters. The second line contains s which is the given template. In s only the first k lowercase letters of Latin alphabet and question marks can be present, the length of s is from 1 to 100 characters inclusively.", "output_spec": "If there is no solution, print IMPOSSIBLE. Otherwise, a single line should contain the required title, satisfying the given template. The title should be a palindrome and it can only contain the first k letters of the Latin alphabet. At that, each of those k letters must be present at least once. If there are several suitable titles, print the lexicographically minimal one.  The lexicographical comparison is performed by the standard < operator in modern programming languages. The line a is lexicographically smaller than the line b, if exists such an i (1\u2009\u2264\u2009i\u2009\u2264\u2009|s|), that ai\u2009<\u2009bi, and for any j (1\u2009\u2264\u2009j\u2009<\u2009i) aj\u2009=\u2009bj. |s| stands for the length of the given template.", "sample_inputs": ["3\na?c", "2\na??a", "2\n?b?a"], "sample_outputs": ["IMPOSSIBLE", "abba", "abba"], "notes": null}, "src_uid": "9d1dd9d722e5fe46823224334b3b208a"}
{"nl": {"description": "One day Vasya the Hipster decided to count how many socks he had. It turned out that he had a red socks and b blue socks.According to the latest fashion, hipsters should wear the socks of different colors: a red one on the left foot, a blue one on the right foot.Every day Vasya puts on new socks in the morning and throws them away before going to bed as he doesn't want to wash them.Vasya wonders, what is the maximum number of days when he can dress fashionable and wear different socks, and after that, for how many days he can then wear the same socks until he either runs out of socks or cannot make a single pair from the socks he's got.Can you help him?", "input_spec": "The single line of the input contains two positive integers a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009100) \u2014 the number of red and blue socks that Vasya's got.", "output_spec": "Print two space-separated integers \u2014 the maximum number of days when Vasya can wear different socks and the number of days when he can wear the same socks until he either runs out of socks or cannot make a single pair from the socks he's got. Keep in mind that at the end of the day Vasya throws away the socks that he's been wearing on that day.", "sample_inputs": ["3 1", "2 3", "7 3"], "sample_outputs": ["1 1", "2 0", "3 2"], "notes": "NoteIn the first sample Vasya can first put on one pair of different socks, after that he has two red socks left to wear on the second day."}, "src_uid": "775766790e91e539c1cfaa5030e5b955"}
{"nl": {"description": "In this problem we assume the Earth to be a completely round ball and its surface a perfect sphere. The length of the equator and any meridian is considered to be exactly 40\u2009000 kilometers. Thus, travelling from North Pole to South Pole or vice versa takes exactly 20\u2009000 kilometers.Limak, a polar bear, lives on the North Pole. Close to the New Year, he helps somebody with delivering packages all around the world. Instead of coordinates of places to visit, Limak got a description how he should move, assuming that he starts from the North Pole. The description consists of n parts. In the i-th part of his journey, Limak should move ti kilometers in the direction represented by a string diri that is one of: \"North\", \"South\", \"West\", \"East\".Limak isn\u2019t sure whether the description is valid. You must help him to check the following conditions:  If at any moment of time (before any of the instructions or while performing one of them) Limak is on the North Pole, he can move only to the South.  If at any moment of time (before any of the instructions or while performing one of them) Limak is on the South Pole, he can move only to the North.  The journey must end on the North Pole. Check if the above conditions are satisfied and print \"YES\" or \"NO\" on a single line.", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950). The i-th of next n lines contains an integer ti and a string diri (1\u2009\u2264\u2009ti\u2009\u2264\u2009106, )\u00a0\u2014 the length and the direction of the i-th part of the journey, according to the description Limak got.", "output_spec": "Print \"YES\" if the description satisfies the three conditions, otherwise print \"NO\", both without the quotes.", "sample_inputs": ["5\n7500 South\n10000 East\n3500 North\n4444 West\n4000 North", "2\n15000 South\n4000 East", "5\n20000 South\n1000 North\n1000000 West\n9000 North\n10000 North", "3\n20000 South\n10 East\n20000 North", "2\n1000 North\n1000 South", "4\n50 South\n50 North\n15000 South\n15000 North"], "sample_outputs": ["YES", "NO", "YES", "NO", "NO", "YES"], "notes": "NoteDrawings below show how Limak's journey would look like in first two samples. In the second sample the answer is \"NO\" because he doesn't end on the North Pole.  "}, "src_uid": "11ac96a9daa97ae1900f123be921e517"}
{"nl": {"description": "You are given n rectangles. The corners of rectangles have integer coordinates and their edges are parallel to the Ox and Oy axes. The rectangles may touch each other, but they do not overlap (that is, there are no points that belong to the interior of more than one rectangle). Your task is to determine if the rectangles form a square. In other words, determine if the set of points inside or on the border of at least one rectangle is precisely equal to the set of points inside or on the border of some square.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20095). Next n lines contain four integers each, describing a single rectangle: x1, y1, x2, y2 (0\u2009\u2264\u2009x1\u2009<\u2009x2\u2009\u2264\u200931400,\u20090\u2009\u2264\u2009y1\u2009<\u2009y2\u2009\u2264\u200931400) \u2014 x1 and x2 are x-coordinates of the left and right edges of the rectangle, and y1 and y2 are y-coordinates of the bottom and top edges of the rectangle.  No two rectangles overlap (that is, there are no points that belong to the interior of more than one rectangle).", "output_spec": "In a single line print \"YES\", if the given rectangles form a square, or \"NO\" otherwise.", "sample_inputs": ["5\n0 0 2 3\n0 3 3 5\n2 0 5 2\n3 2 5 5\n2 2 3 3", "4\n0 0 2 3\n0 3 3 5\n2 0 5 2\n3 2 5 5"], "sample_outputs": ["YES", "NO"], "notes": null}, "src_uid": "f63fc2d97fd88273241fce206cc217f2"}
{"nl": {"description": "SIHanatsuka - EMber SIHanatsuka - ATONEMENTBack in time, the seven-year-old Nora used to play lots of games with her creation ROBO_Head-02, both to have fun and enhance his abilities.One day, Nora's adoptive father, Phoenix Wyle, brought Nora $$$n$$$ boxes of toys. Before unpacking, Nora decided to make a fun game for ROBO.She labelled all $$$n$$$ boxes with $$$n$$$ distinct integers $$$a_1, a_2, \\ldots, a_n$$$ and asked ROBO to do the following action several (possibly zero) times:  Pick three distinct indices $$$i$$$, $$$j$$$ and $$$k$$$, such that $$$a_i \\mid a_j$$$ and $$$a_i \\mid a_k$$$. In other words, $$$a_i$$$ divides both $$$a_j$$$ and $$$a_k$$$, that is $$$a_j \\bmod a_i = 0$$$, $$$a_k \\bmod a_i = 0$$$.  After choosing, Nora will give the $$$k$$$-th box to ROBO, and he will place it on top of the box pile at his side. Initially, the pile is empty.  After doing so, the box $$$k$$$ becomes unavailable for any further actions. Being amused after nine different tries of the game, Nora asked ROBO to calculate the number of possible different piles having the largest amount of boxes in them. Two piles are considered different if there exists a position where those two piles have different boxes.Since ROBO was still in his infant stages, and Nora was still too young to concentrate for a long time, both fell asleep before finding the final answer. Can you help them?As the number of such piles can be very large, you should print the answer modulo $$$10^9 + 7$$$.", "input_spec": "The first line contains an integer $$$n$$$ ($$$3 \\le n \\le 60$$$), denoting the number of boxes. The second line contains $$$n$$$ distinct integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$1 \\le a_i \\le 60$$$), where $$$a_i$$$ is the label of the $$$i$$$-th box.", "output_spec": "Print the number of distinct piles having the maximum number of boxes that ROBO_Head can have, modulo $$$10^9 + 7$$$.", "sample_inputs": ["3\n2 6 8", "5\n2 3 4 9 12", "4\n5 7 2 9"], "sample_outputs": ["2", "4", "1"], "notes": "NoteLet's illustrate the box pile as a sequence $$$b$$$, with the pile's bottommost box being at the leftmost position.In the first example, there are $$$2$$$ distinct piles possible:   $$$b = [6]$$$ ($$$[2, \\mathbf{6}, 8] \\xrightarrow{(1, 3, 2)} [2, 8]$$$)  $$$b = [8]$$$ ($$$[2, 6, \\mathbf{8}] \\xrightarrow{(1, 2, 3)} [2, 6]$$$) In the second example, there are $$$4$$$ distinct piles possible:   $$$b = [9, 12]$$$ ($$$[2, 3, 4, \\mathbf{9}, 12] \\xrightarrow{(2, 5, 4)} [2, 3, 4, \\mathbf{12}] \\xrightarrow{(1, 3, 4)} [2, 3, 4]$$$)  $$$b = [4, 12]$$$ ($$$[2, 3, \\mathbf{4}, 9, 12] \\xrightarrow{(1, 5, 3)} [2, 3, 9, \\mathbf{12}] \\xrightarrow{(2, 3, 4)} [2, 3, 9]$$$)  $$$b = [4, 9]$$$ ($$$[2, 3, \\mathbf{4}, 9, 12] \\xrightarrow{(1, 5, 3)} [2, 3, \\mathbf{9}, 12] \\xrightarrow{(2, 4, 3)} [2, 3, 12]$$$)  $$$b = [9, 4]$$$ ($$$[2, 3, 4, \\mathbf{9}, 12] \\xrightarrow{(2, 5, 4)} [2, 3, \\mathbf{4}, 12] \\xrightarrow{(1, 4, 3)} [2, 3, 12]$$$) In the third sequence, ROBO can do nothing at all. Therefore, there is only $$$1$$$ valid pile, and that pile is empty."}, "src_uid": "c8d43a60ddc0a7b98a7269dc3a2478dc"}
{"nl": {"description": "There is a grid with $$$n$$$ rows and $$$m$$$ columns. Every cell of the grid should be colored either blue or yellow.A coloring of the grid is called stupid if every row has exactly one segment of blue cells and every column has exactly one segment of yellow cells.In other words, every row must have at least one blue cell, and all blue cells in a row must be consecutive. Similarly, every column must have at least one yellow cell, and all yellow cells in a column must be consecutive.  An example of a stupid coloring.   Examples of clever colorings. The first coloring is missing a blue cell in the second row, and the second coloring has two yellow segments in the second column. How many stupid colorings of the grid are there? Two colorings are considered different if there is some cell that is colored differently.", "input_spec": "The only line contains two integers $$$n$$$, $$$m$$$ ($$$1\\le n, m\\le 2021$$$).", "output_spec": "Output a single integer \u2014 the number of stupid colorings modulo $$$998244353$$$.", "sample_inputs": ["2 2", "4 3", "2020 2021"], "sample_outputs": ["2", "294", "50657649"], "notes": "NoteIn the first test case, these are the only two stupid $$$2\\times 2$$$ colorings.  "}, "src_uid": "1738dc65af1fffa445cb0c3074c6bedb"}
{"nl": {"description": "A boy named Vasya wants to play an old Russian solitaire called \"Accordion\". In this solitaire, the player must observe the following rules:  A deck of n cards is carefully shuffled, then all n cards are put on the table in a line from left to right;  Before each move the table has several piles of cards lying in a line (initially there are n piles, each pile has one card). Let's number the piles from left to right, from 1 to x. During one move, a player can take the whole pile with the maximum number x (that is the rightmost of remaining) and put it on the top of pile x\u2009-\u20091 (if it exists) or on the top of pile x\u2009-\u20093 (if it exists). The player can put one pile on top of another one only if the piles' top cards have the same suits or values. Please note that if pile x goes on top of pile y, then the top card of pile x becomes the top card of the resulting pile. Also note that each move decreases the total number of piles by 1;  The solitaire is considered completed if all cards are in the same pile. Vasya has already shuffled the cards and put them on the table, help him understand whether completing this solitaire is possible or not. ", "input_spec": "The first input line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200952) \u2014 the number of cards in Vasya's deck. The next line contains n space-separated strings c1,\u2009c2,\u2009...,\u2009cn, where string ci describes the i-th card on the table. Each string ci consists of exactly two characters, the first one represents the card's value, the second one represents its suit. Cards on the table are numbered from left to right.  A card's value is specified by one of these characters: \"2\", \"3\", \"4\", \"5\", \"6\", \"7\", \"8\", \"9\", \"T\", \"J\", \"Q\", \"K\", \"A\". A card's suit is specified by one of these characters: \"S\", \"D\", \"H\", \"C\". It is not guaranteed that the deck has all possible cards. Also, the cards in Vasya's deck can repeat.", "output_spec": "On a single line print the answer to the problem: string \"YES\" (without the quotes) if completing the solitaire is possible, string \"NO\" (without the quotes) otherwise.", "sample_inputs": ["4\n2S 2S 2C 2C", "2\n3S 2C"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first sample you can act like that:   put the 4-th pile on the 1-st one;  put the 3-rd pile on the 2-nd one;  put the 2-nd pile on the 1-st one. In the second sample there is no way to complete the solitaire."}, "src_uid": "1805771e194d323edacf2526a1eb6768"}
{"nl": {"description": "As a tradition, every year before IOI all the members of Natalia Fan Club are invited to Malek Dance Club to have a fun night together. Malek Dance Club has 2n members and coincidentally Natalia Fan Club also has 2n members. Each member of MDC is assigned a unique id i from 0 to 2n\u2009-\u20091. The same holds for each member of NFC.One of the parts of this tradition is one by one dance, where each member of MDC dances with a member of NFC. A dance pair is a pair of numbers (a,\u2009b) such that member a from MDC dances with member b from NFC.The complexity of a pairs' assignment is the number of pairs of dancing pairs (a,\u2009b) and (c,\u2009d) such that a\u2009<\u2009c and b\u2009>\u2009d.You are given a binary number of length n named x. We know that member i from MDC dances with member  from NFC. Your task is to calculate the complexity of this assignment modulo 1000000007 (109\u2009+\u20097).Expression  denotes applying \u00abXOR\u00bb to numbers x and y. This operation exists in all modern programming languages, for example, in C++ and Java it denotes as \u00ab^\u00bb, in Pascal \u2014 \u00abxor\u00bb.", "input_spec": "The first line of input contains a binary number x of lenght n, (1\u2009\u2264\u2009n\u2009\u2264\u2009100). This number may contain leading zeros.", "output_spec": "Print the complexity of the given dance assignent modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["11", "01", "1"], "sample_outputs": ["6", "2", "1"], "notes": null}, "src_uid": "89b51a31e00424edd1385f2120028b9d"}
{"nl": {"description": "Masha lives in a multi-storey building, where floors are numbered with positive integers. Two floors are called adjacent if their numbers differ by one. Masha decided to visit Egor. Masha lives on the floor $$$x$$$, Egor on the floor $$$y$$$ (not on the same floor with Masha).The house has a staircase and an elevator. If Masha uses the stairs, it takes $$$t_1$$$ seconds for her to walk between adjacent floors (in each direction). The elevator passes between adjacent floors (in each way) in $$$t_2$$$ seconds. The elevator moves with doors closed. The elevator spends $$$t_3$$$ seconds to open or close the doors. We can assume that time is not spent on any action except moving between adjacent floors and waiting for the doors to open or close. If Masha uses the elevator, it immediately goes directly to the desired floor.Coming out of the apartment on her floor, Masha noticed that the elevator is now on the floor $$$z$$$ and has closed doors. Now she has to choose whether to use the stairs or use the elevator. If the time that Masha needs to get to the Egor's floor by the stairs is strictly less than the time it will take her using the elevator, then she will use the stairs, otherwise she will choose the elevator.Help Mary to understand whether to use the elevator or the stairs.", "input_spec": "The only line contains six integers $$$x$$$, $$$y$$$, $$$z$$$, $$$t_1$$$, $$$t_2$$$, $$$t_3$$$ ($$$1 \\leq x, y, z, t_1, t_2, t_3 \\leq 1000$$$)\u00a0\u2014 the floor Masha is at, the floor Masha wants to get to, the floor the elevator is located on, the time it takes Masha to pass between two floors by stairs, the time it takes the elevator to pass between two floors and the time it takes for the elevator to close or open the doors. It is guaranteed that $$$x \\ne y$$$.", "output_spec": "If the time it will take to use the elevator is not greater than the time it will take to use the stairs, print \u00abYES\u00bb (without quotes), otherwise print \u00abNO> (without quotes). You can print each letter in any case (upper or lower).", "sample_inputs": ["5 1 4 4 2 1", "1 6 6 2 1 1", "4 1 7 4 1 2"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteIn the first example:If Masha goes by the stairs, the time she spends is $$$4 \\cdot 4 = 16$$$, because she has to go $$$4$$$ times between adjacent floors and each time she spends $$$4$$$ seconds. If she chooses the elevator, she will have to wait $$$2$$$ seconds while the elevator leaves the $$$4$$$-th floor and goes to the $$$5$$$-th. After that the doors will be opening for another $$$1$$$ second. Then Masha will enter the elevator, and she will have to wait for $$$1$$$ second for the doors closing. Next, the elevator will spend $$$4 \\cdot 2 = 8$$$ seconds going from the $$$5$$$-th floor to the $$$1$$$-st, because the elevator has to pass $$$4$$$ times between adjacent floors and spends $$$2$$$ seconds each time. And finally, it will take another $$$1$$$ second before the doors are open and Masha can come out. Thus, all the way by elevator will take $$$2 + 1 + 1 + 8 + 1 = 13$$$ seconds, which is less than $$$16$$$ seconds, so Masha has to choose the elevator.In the second example, it is more profitable for Masha to use the stairs, because it will take $$$13$$$ seconds to use the elevator, that is more than the $$$10$$$ seconds it will takes to go by foot.In the third example, the time it takes to use the elevator is equal to the time it takes to walk up by the stairs, and is equal to $$$12$$$ seconds. That means Masha will take the elevator."}, "src_uid": "05cffd59b28b9e026ca3203718b2e6ca"}
{"nl": {"description": "The HR manager was disappointed again. The last applicant failed the interview the same way as 24 previous ones. \"Do I give such a hard task?\" \u2014 the HR manager thought. \"Just raise number 5 to the power of n and get last two digits of the number. Yes, of course, n can be rather big, and one cannot find the power using a calculator, but we need people who are able to think, not just follow the instructions.\"Could you pass the interview in the machine vision company in IT City?", "input_spec": "The only line of the input contains a single integer n (2\u2009\u2264\u2009n\u2009\u2264\u20092\u00b71018) \u2014 the power in which you need to raise number 5.", "output_spec": "Output the last two digits of 5n without spaces between them.", "sample_inputs": ["2"], "sample_outputs": ["25"], "notes": null}, "src_uid": "dcaff75492eafaf61d598779d6202c9d"}
{"nl": {"description": "Anton has the integer x. He is interested what positive integer, which doesn't exceed x, has the maximum sum of digits.Your task is to help Anton and to find the integer that interests him. If there are several such integers, determine the biggest of them. ", "input_spec": "The first line contains the positive integer x (1\u2009\u2264\u2009x\u2009\u2264\u20091018) \u2014 the integer which Anton has. ", "output_spec": "Print the positive integer which doesn't exceed x and has the maximum sum of digits. If there are several such integers, print the biggest of them. Printed integer must not contain leading zeros.", "sample_inputs": ["100", "48", "521"], "sample_outputs": ["99", "48", "499"], "notes": null}, "src_uid": "e55b0debbf33c266091e6634494356b8"}
{"nl": {"description": "Furik loves painting stars. A star is a shape that results if we take a regular pentagon and paint all diagonals in it.   Recently he decided to teach Rubik to paint stars. After many years of training Rubik could paint stars easily. But now Furik decided to test Rubik and complicated the task. Rubik must paint n stars, observing the following rules:  all stars must be painted in a single move (i.e. it is forbidden to take the pen away from the paper);  it is forbidden to paint the same segment of non-zero length more than once;  the stars can intersect only in their vertexes;  the length of a side of the regular pentagon, in which Rubik paints each star, must equal 10. Help Rubik to cope with this hard task.", "input_spec": "A single line contains an integer (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of stars to paint.", "output_spec": "On the first line print an integer m (1\u2009\u2264\u2009m\u2009\u2264\u20095\u00b7n). On the next m lines print coordinates of m distinct points with accuracy of at least 9 and at most 100 digits after decimal point. All coordinates should not exceed 5000 in their absolute value. On each of the next n lines print 5 integers \u2014 the indexes of the points that form the given star in the clockwise or counterclockwise order. On the next line print 5\u00b7n\u2009+\u20091 integers \u2014 the numbers of points in the order, in which Rubik paints stars. That is, if number with index i is ai, and number with index i\u2009+\u20091 is ai\u2009+\u20091, then points with indexes ai and ai\u2009+\u20091 will have a segment painted between them.  You can consider all m printed points indexed from 1 to m in the order, in which they occur in the output. Separate the numbers on the lines with whitespaces. Note that the answer has an imprecise validation. Try to obtain as accurate a solution as possible. The validator performs all calculations considering that the absolute error of a participant's answer is not more than 10\u2009-\u20098.", "sample_inputs": ["1"], "sample_outputs": ["5\n3.830127018922193 3.366025403784439\n-3.601321235851749 10.057331467373021\n0.466045194906253 19.192786043799030\n10.411264148588986 18.147501411122495\n12.490381056766580 8.366025403784439\n1 2 3 4 5\n1 3 5 2 4 1"], "notes": "NoteThe initial position of points in the sample is:  The order in which Rubik can paint segments is:  "}, "src_uid": "db263b866e93e3a97731e11102923902"}
{"nl": {"description": "The on-board computer on Polycarp's car measured that the car speed at the beginning of some section of the path equals v1 meters per second, and in the end it is v2 meters per second. We know that this section of the route took exactly t seconds to pass.Assuming that at each of the seconds the speed is constant, and between seconds the speed can change at most by d meters per second in absolute value (i.e., the difference in the speed of any two adjacent seconds does not exceed d in absolute value), find the maximum possible length of the path section in meters.", "input_spec": "The first line contains two integers v1 and v2 (1\u2009\u2264\u2009v1,\u2009v2\u2009\u2264\u2009100) \u2014 the speeds in meters per second at the beginning of the segment and at the end of the segment, respectively. The second line contains two integers t (2\u2009\u2264\u2009t\u2009\u2264\u2009100) \u2014 the time when the car moves along the segment in seconds, d (0\u2009\u2264\u2009d\u2009\u2264\u200910) \u2014 the maximum value of the speed change between adjacent seconds. It is guaranteed that there is a way to complete the segment so that:   the speed in the first second equals v1,  the speed in the last second equals v2,  the absolute value of difference of speeds between any two adjacent seconds doesn't exceed d. ", "output_spec": "Print the maximum possible length of the path segment in meters. ", "sample_inputs": ["5 6\n4 2", "10 10\n10 0"], "sample_outputs": ["26", "100"], "notes": "NoteIn the first sample the sequence of speeds of Polycarpus' car can look as follows: 5, 7, 8, 6. Thus, the total path is 5\u2009+\u20097\u2009+\u20098\u2009+\u20096\u2009=\u200926 meters.In the second sample, as d\u2009=\u20090, the car covers the whole segment at constant speed v\u2009=\u200910. In t\u2009=\u200910 seconds it covers the distance of 100 meters."}, "src_uid": "9246aa2f506fcbcb47ad24793d09f2cf"}
{"nl": {"description": "Consider the following experiment. You have a deck of $$$m$$$ cards, and exactly one card is a joker. $$$n$$$ times, you do the following: shuffle the deck, take the top card of the deck, look at it and return it into the deck.Let $$$x$$$ be the number of times you have taken the joker out of the deck during this experiment. Assuming that every time you shuffle the deck, all $$$m!$$$ possible permutations of cards are equiprobable, what is the expected value of $$$x^k$$$? Print the answer modulo $$$998244353$$$.", "input_spec": "The only line contains three integers $$$n$$$, $$$m$$$ and $$$k$$$ ($$$1 \\le n, m < 998244353$$$, $$$1 \\le k \\le 5000$$$).", "output_spec": "Print one integer \u2014 the expected value of $$$x^k$$$, taken modulo $$$998244353$$$ (the answer can always be represented as an irreducible fraction $$$\\frac{a}{b}$$$, where $$$b \\mod 998244353 \\ne 0$$$; you have to print $$$a \\cdot b^{-1} \\mod 998244353$$$).", "sample_inputs": ["1 1 1", "1 1 5000", "2 2 2", "998244352 1337 5000"], "sample_outputs": ["1", "1", "499122178", "326459680"], "notes": null}, "src_uid": "e6b3e559b5fd4e05adf9f1cd1b22126b"}
{"nl": {"description": "A sequence of integers $$$b_1, b_2, \\ldots, b_m$$$ is called good if $$$max(b_1, b_2, \\ldots, b_m) \\cdot min(b_1, b_2, \\ldots, b_m) \\ge b_1 + b_2 + \\ldots + b_m$$$.A sequence of integers $$$a_1, a_2, \\ldots, a_n$$$ is called perfect if every non-empty subsequence of $$$a$$$ is good.YouKn0wWho has two integers $$$n$$$ and $$$M$$$, $$$M$$$ is prime. Help him find the number, modulo $$$M$$$, of perfect sequences $$$a_1, a_2, \\ldots, a_n$$$ such that $$$1 \\le a_i \\le n + 1$$$ for each integer $$$i$$$ from $$$1$$$ to $$$n$$$.A sequence $$$d$$$ is a subsequence of a sequence $$$c$$$ if $$$d$$$ can be obtained from $$$c$$$ by deletion of several (possibly, zero or all) elements.", "input_spec": "The first and only line of the input contains two space-separated integers $$$n$$$ and $$$M$$$ ($$$1 \\le n \\le 200$$$; $$$10^8 \\le M \\le 10^9$$$). It is guaranteed that $$$M$$$ is prime.", "output_spec": "Print a single integer \u00a0\u2014 the number of perfect sequences modulo $$$M$$$.", "sample_inputs": ["2 998244353", "4 100000007", "69 999999937"], "sample_outputs": ["4", "32", "456886663"], "notes": "NoteIn the first test case, the perfect sequences are $$$[2, 2]$$$, $$$[2, 3]$$$, $$$[3, 2]$$$ and $$$[3, 3]$$$.In the second test case, some of the perfect sequences are $$$[3, 4, 3, 5]$$$, $$$[4, 5, 4, 4]$$$, $$$[4, 5, 5, 5]$$$ etc. One example of a sequence which is not perfect is $$$[2, 3, 3, 4]$$$, because, for example, the subsequence $$$[2, 3, 4]$$$ is not an good as $$$2 \\cdot 4 < 2 + 3 + 4$$$."}, "src_uid": "cf57508de47d80bc983861f70bb5f3d6"}
{"nl": {"description": "This is an easy version of the problem. The actual problems are different, but the easy version is almost a subtask of the hard version. Note that the constraints and the output format are different.You are given a string $$$s$$$ consisting of $$$n$$$ lowercase Latin letters.You have to color all its characters one of the two colors (each character to exactly one color, the same letters can be colored the same or different colors, i.e. you can choose exactly one color for each index in $$$s$$$).After coloring, you can swap any two neighboring characters of the string that are colored different colors. You can perform such an operation arbitrary (possibly, zero) number of times.The goal is to make the string sorted, i.e. all characters should be in alphabetical order.Your task is to say if it is possible to color the given string so that after coloring it can become sorted by some sequence of swaps. Note that you have to restore only coloring, not the sequence of swaps.", "input_spec": "The first line of the input contains one integer $$$n$$$ ($$$1 \\le n \\le 200$$$) \u2014 the length of $$$s$$$. The second line of the input contains the string $$$s$$$ consisting of exactly $$$n$$$ lowercase Latin letters.", "output_spec": "If it is impossible to color the given string so that after coloring it can become sorted by some sequence of swaps, print \"NO\" (without quotes) in the first line. Otherwise, print \"YES\" in the first line and any correct coloring in the second line (the coloring is the string consisting of $$$n$$$ characters, the $$$i$$$-th character should be '0' if the $$$i$$$-th character is colored the first color and '1' otherwise).", "sample_inputs": ["9\nabacbecfd", "8\naaabbcbb", "7\nabcdedc", "5\nabcde"], "sample_outputs": ["YES\n001010101", "YES\n01011011", "NO", "YES\n00000"], "notes": null}, "src_uid": "9bd31827cda83eacfcf5e46cdeaabe2b"}
{"nl": {"description": "Alice and Bob are playing a game with $$$n$$$ piles of stones. It is guaranteed that $$$n$$$ is an even number. The $$$i$$$-th pile has $$$a_i$$$ stones.Alice and Bob will play a game alternating turns with Alice going first.On a player's turn, they must choose exactly $$$\\frac{n}{2}$$$ nonempty piles and independently remove a positive number of stones from each of the chosen piles. They can remove a different number of stones from the piles in a single turn. The first player unable to make a move loses (when there are less than $$$\\frac{n}{2}$$$ nonempty piles).Given the starting configuration, determine who will win the game.", "input_spec": "The first line contains one integer $$$n$$$ ($$$2 \\leq n \\leq 50$$$)\u00a0\u2014 the number of piles. It is guaranteed that $$$n$$$ is an even number. The second line contains $$$n$$$ integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$1 \\leq a_i \\leq 50$$$)\u00a0\u2014 the number of stones in the piles.", "output_spec": "Print a single string \"Alice\" if Alice wins; otherwise, print \"Bob\" (without double quotes).", "sample_inputs": ["2\n8 8", "4\n3 1 4 1"], "sample_outputs": ["Bob", "Alice"], "notes": "NoteIn the first example, each player can only remove stones from one pile ($$$\\frac{2}{2}=1$$$). Alice loses, since Bob can copy whatever Alice does on the other pile, so Alice will run out of moves first.In the second example, Alice can remove $$$2$$$ stones from the first pile and $$$3$$$ stones from the third pile on her first move to guarantee a win."}, "src_uid": "4b9cf82967aa8441e9af3db3101161e9"}
{"nl": {"description": "Sasha is a very happy guy, that's why he is always on the move. There are $$$n$$$ cities in the country where Sasha lives. They are all located on one straight line, and for convenience, they are numbered from $$$1$$$ to $$$n$$$ in increasing order. The distance between any two adjacent cities is equal to $$$1$$$ kilometer. Since all roads in the country are directed, it's possible to reach the city $$$y$$$ from the city $$$x$$$ only if $$$x < y$$$. Once Sasha decided to go on a trip around the country and to visit all $$$n$$$ cities. He will move with the help of his car, Cheetah-2677. The tank capacity of this model is $$$v$$$ liters, and it spends exactly $$$1$$$ liter of fuel for $$$1$$$ kilometer of the way. At the beginning of the journey, the tank is empty. Sasha is located in the city with the number $$$1$$$ and wants to get to the city with the number $$$n$$$. There is a gas station in each city. In the $$$i$$$-th city, the price of $$$1$$$ liter of fuel is $$$i$$$ dollars. It is obvious that at any moment of time, the tank can contain at most $$$v$$$ liters of fuel.Sasha doesn't like to waste money, that's why he wants to know what is the minimum amount of money is needed to finish the trip if he can buy fuel in any city he wants. Help him to figure it out!", "input_spec": "The first line contains two integers $$$n$$$ and $$$v$$$ ($$$2 \\le n \\le 100$$$, $$$1 \\le v \\le 100$$$) \u00a0\u2014 the number of cities in the country and the capacity of the tank.", "output_spec": "Print one integer\u00a0\u2014 the minimum amount of money that is needed to finish the trip.", "sample_inputs": ["4 2", "7 6"], "sample_outputs": ["4", "6"], "notes": "NoteIn the first example, Sasha can buy $$$2$$$ liters for $$$2$$$ dollars ($$$1$$$ dollar per liter) in the first city, drive to the second city, spend $$$1$$$ liter of fuel on it, then buy $$$1$$$ liter for $$$2$$$ dollars in the second city and then drive to the $$$4$$$-th city. Therefore, the answer is $$$1+1+2=4$$$.In the second example, the capacity of the tank allows to fill the tank completely in the first city, and drive to the last city without stops in other cities."}, "src_uid": "f8eb96deeb82d9f011f13d7dac1e1ab7"}
{"nl": {"description": "At regular competition Vladik and Valera won a and b candies respectively. Vladik offered 1 his candy to Valera. After that Valera gave Vladik 2 his candies, so that no one thought that he was less generous. Vladik for same reason gave 3 candies to Valera in next turn.More formally, the guys take turns giving each other one candy more than they received in the previous turn.This continued until the moment when one of them couldn\u2019t give the right amount of candy. Candies, which guys got from each other, they don\u2019t consider as their own. You need to know, who is the first who can\u2019t give the right amount of candy.", "input_spec": "Single line of input data contains two space-separated integers a, b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109) \u2014 number of Vladik and Valera candies respectively.", "output_spec": "Pring a single line \"Vladik\u2019\u2019 in case, if Vladik first who can\u2019t give right amount of candy, or \"Valera\u2019\u2019 otherwise.", "sample_inputs": ["1 1", "7 6"], "sample_outputs": ["Valera", "Vladik"], "notes": "NoteIllustration for first test case:Illustration for second test case:"}, "src_uid": "87e37a82be7e39e433060fd8cdb03270"}
{"nl": {"description": "The tram in Berland goes along a straight line from the point 0 to the point s and back, passing 1 meter per t1 seconds in both directions. It means that the tram is always in the state of uniform rectilinear motion, instantly turning around at points x\u2009=\u20090 and x\u2009=\u2009s.Igor is at the point x1. He should reach the point x2. Igor passes 1 meter per t2 seconds. Your task is to determine the minimum time Igor needs to get from the point x1 to the point x2, if it is known where the tram is and in what direction it goes at the moment Igor comes to the point x1.Igor can enter the tram unlimited number of times at any moment when his and the tram's positions coincide. It is not obligatory that points in which Igor enter and exit the tram are integers. Assume that any boarding and unboarding happens instantly. Igor can move arbitrary along the line (but not faster than 1 meter per t2 seconds). He can also stand at some point for some time.", "input_spec": "The first line contains three integers s, x1 and x2 (2\u2009\u2264\u2009s\u2009\u2264\u20091000, 0\u2009\u2264\u2009x1,\u2009x2\u2009\u2264\u2009s, x1\u2009\u2260\u2009x2)\u00a0\u2014 the maximum coordinate of the point to which the tram goes, the point Igor is at, and the point he should come to. The second line contains two integers t1 and t2 (1\u2009\u2264\u2009t1,\u2009t2\u2009\u2264\u20091000)\u00a0\u2014 the time in seconds in which the tram passes 1 meter and the time in seconds in which Igor passes 1 meter. The third line contains two integers p and d (1\u2009\u2264\u2009p\u2009\u2264\u2009s\u2009-\u20091, d is either 1 or )\u00a0\u2014 the position of the tram in the moment Igor came to the point x1 and the direction of the tram at this moment. If , the tram goes in the direction from the point s to the point 0. If d\u2009=\u20091, the tram goes in the direction from the point 0 to the point s.", "output_spec": "Print the minimum time in seconds which Igor needs to get from the point x1 to the point x2.", "sample_inputs": ["4 2 4\n3 4\n1 1", "5 4 0\n1 2\n3 1"], "sample_outputs": ["8", "7"], "notes": "NoteIn the first example it is profitable for Igor to go by foot and not to wait the tram. Thus, he has to pass 2 meters and it takes 8 seconds in total, because he passes 1 meter per 4 seconds. In the second example Igor can, for example, go towards the point x2 and get to the point 1 in 6 seconds (because he has to pass 3 meters, but he passes 1 meters per 2 seconds). At that moment the tram will be at the point 1, so Igor can enter the tram and pass 1 meter in 1 second. Thus, Igor will reach the point x2 in 7 seconds in total."}, "src_uid": "fb3aca6eba3a952e9d5736c5d8566821"}
{"nl": {"description": "Galois is one of the strongest chess players of Byteforces. He has even invented a new variant of chess, which he named \u00abPawnChess\u00bb.This new game is played on a board consisting of 8 rows and 8 columns. At the beginning of every game some black and white pawns are placed on the board. The number of black pawns placed is not necessarily equal to the number of white pawns placed.   Lets enumerate rows and columns with integers from 1 to 8. Rows are numbered from top to bottom, while columns are numbered from left to right. Now we denote as (r,\u2009c) the cell located at the row r and at the column c.There are always two players A and B playing the game. Player A plays with white pawns, while player B plays with black ones. The goal of player A is to put any of his pawns to the row 1, while player B tries to put any of his pawns to the row 8. As soon as any of the players completes his goal the game finishes immediately and the succeeded player is declared a winner.Player A moves first and then they alternate turns. On his move player A must choose exactly one white pawn and move it one step upward and player B (at his turn) must choose exactly one black pawn and move it one step down. Any move is possible only if the targeted cell is empty. It's guaranteed that for any scenario of the game there will always be at least one move available for any of the players.Moving upward means that the pawn located in (r,\u2009c) will go to the cell (r\u2009-\u20091,\u2009c), while moving down means the pawn located in (r,\u2009c) will go to the cell (r\u2009+\u20091,\u2009c). Again, the corresponding cell must be empty, i.e. not occupied by any other pawn of any color.Given the initial disposition of the board, determine who wins the game if both players play optimally. Note that there will always be a winner due to the restriction that for any game scenario both players will have some moves available.", "input_spec": "The input consists of the board description given in eight lines, each line contains eight characters. Character 'B' is used to denote a black pawn, and character 'W' represents a white pawn. Empty cell is marked with '.'.  It's guaranteed that there will not be white pawns on the first row neither black pawns on the last row.", "output_spec": "Print 'A' if player A wins the game on the given board, and 'B' if player B will claim the victory. Again, it's guaranteed that there will always be a winner on the given board.", "sample_inputs": ["........\n........\n.B....B.\n....W...\n........\n..W.....\n........\n........", "..B.....\n..W.....\n......B.\n........\n.....W..\n......B.\n........\n........"], "sample_outputs": ["A", "B"], "notes": "NoteIn the first sample player A is able to complete his goal in 3 steps by always moving a pawn initially located at (4,\u20095). Player B needs at least 5 steps for any of his pawns to reach the row 8. Hence, player A will be the winner."}, "src_uid": "0ddc839e17dee20e1a954c1289de7fbd"}
{"nl": {"description": "Karen is getting ready for a new school day!  It is currently hh:mm, given in a 24-hour format. As you know, Karen loves palindromes, and she believes that it is good luck to wake up when the time is a palindrome.What is the minimum number of minutes she should sleep, such that, when she wakes up, the time is a palindrome?Remember that a palindrome is a string that reads the same forwards and backwards. For instance, 05:39 is not a palindrome, because 05:39 backwards is 93:50. On the other hand, 05:50 is a palindrome, because 05:50 backwards is 05:50.", "input_spec": "The first and only line of input contains a single string in the format hh:mm (00\u2009\u2264\u2009 hh \u2009\u2264\u200923, 00\u2009\u2264\u2009 mm \u2009\u2264\u200959).", "output_spec": "Output a single integer on a line by itself, the minimum number of minutes she should sleep, such that, when she wakes up, the time is a palindrome.", "sample_inputs": ["05:39", "13:31", "23:59"], "sample_outputs": ["11", "0", "1"], "notes": "NoteIn the first test case, the minimum number of minutes Karen should sleep for is 11. She can wake up at 05:50, when the time is a palindrome.In the second test case, Karen can wake up immediately, as the current time, 13:31, is already a palindrome.In the third test case, the minimum number of minutes Karen should sleep for is 1 minute. She can wake up at 00:00, when the time is a palindrome."}, "src_uid": "3ad3b8b700f6f34b3a53fdb63af351a5"}
{"nl": {"description": "Vasya has a non-negative integer n. He wants to round it to nearest integer, which ends up with 0. If n already ends up with 0, Vasya considers it already rounded.For example, if n\u2009=\u20094722 answer is 4720. If n\u2009=\u20095 Vasya can round it to 0 or to 10. Both ways are correct.For given n find out to which integer will Vasya round it.", "input_spec": "The first line contains single integer n (0\u2009\u2264\u2009n\u2009\u2264\u2009109)\u00a0\u2014 number that Vasya has.", "output_spec": "Print result of rounding n. Pay attention that in some cases answer isn't unique. In that case print any correct answer.", "sample_inputs": ["5", "113", "1000000000", "5432359"], "sample_outputs": ["0", "110", "1000000000", "5432360"], "notes": "NoteIn the first example n\u2009=\u20095. Nearest integers, that ends up with zero are 0 and 10. Any of these answers is correct, so you can print 0 or 10."}, "src_uid": "29c4d5fdf1328bbc943fa16d54d97aa9"}
{"nl": {"description": "This is the modification of the problem used during the official round. Unfortunately, author's solution of the original problem appeared wrong, so the problem was changed specially for the archive.Once upon a time in a far away kingdom lived the King. The King had a beautiful daughter, Victoria. They lived happily, but not happily ever after: one day a vicious dragon attacked the kingdom and stole Victoria. The King was full of grief, yet he gathered his noble knights and promised half of his kingdom and Victoria's hand in marriage to the one who will save the girl from the infernal beast.Having travelled for some time, the knights found the dragon's lair and all of them rushed there to save Victoria. Each knight spat on the dragon once and, as the dragon had quite a fragile and frail heart, his heart broke and poor beast died. As for the noble knights, they got Victoria right to the King and started brawling as each one wanted the girl's hand in marriage.The problem was that all the noble knights were equally noble and equally handsome, and Victoria didn't want to marry any of them anyway. Then the King (and he was a very wise man and didn't want to hurt anybody's feelings) decided to find out who will get his daughter randomly, i.e. tossing a coin. However, there turned out to be n noble knights and the coin only has two sides. The good thing is that when a coin is tossed, the coin falls on each side with equal probability. The King got interested how to pick one noble knight using this coin so that all knights had equal probability of being chosen (the probability in that case should always be equal to 1\u2009/\u2009n). First the King wants to know the expected number of times he will need to toss a coin to determine the winner. Besides, while tossing the coin, the King should follow the optimal tossing strategy (i.e. the strategy that minimizes the expected number of tosses). Help the King in this challenging task.", "input_spec": "The first line contains a single integer n from the problem's statement (1\u2009\u2264\u2009n\u2009\u2264\u200910000).", "output_spec": "Print the sought expected number of tosses as an irreducible fraction in the following form: \"a/b\" (without the quotes) without leading zeroes.", "sample_inputs": ["2", "3", "4"], "sample_outputs": ["1/1", "8/3", "2/1"], "notes": null}, "src_uid": "5491b4a27991153a61ac4a2618b2cd0e"}
{"nl": {"description": "Iahub is training for the IOI. What is a better way to train than playing a Zuma-like game? There are n balls put in a row. Each ball is colored in one of k colors. Initially the row doesn't contain three or more contiguous balls with the same color. Iahub has a single ball of color x. He can insert his ball at any position in the row (probably, between two other balls). If at any moment there are three or more contiguous balls of the same color in the row, they are destroyed immediately. This rule is applied multiple times, until there are no more sets of 3 or more contiguous balls of the same color. For example, if Iahub has the row of balls [black, black, white, white, black, black] and a white ball, he can insert the ball between two white balls. Thus three white balls are destroyed, and then four black balls become contiguous, so all four balls are destroyed. The row will not contain any ball in the end, so Iahub can destroy all 6 balls.Iahub wants to destroy as many balls as possible. You are given the description of the row of balls, and the color of Iahub's ball. Help Iahub train for the IOI by telling him the maximum number of balls from the row he can destroy.", "input_spec": "The first line of input contains three integers: n (1\u2009\u2264\u2009n\u2009\u2264\u2009100), k (1\u2009\u2264\u2009k\u2009\u2264\u2009100) and x (1\u2009\u2264\u2009x\u2009\u2264\u2009k). The next line contains n space-separated integers c1,\u2009c2,\u2009...,\u2009cn (1\u2009\u2264\u2009ci\u2009\u2264\u2009k). Number ci means that the i-th ball in the row has color ci. It is guaranteed that the initial row of balls will never contain three or more contiguous balls of the same color. ", "output_spec": "Print a single integer \u2014 the maximum number of balls Iahub can destroy.", "sample_inputs": ["6 2 2\n1 1 2 2 1 1", "1 1 1\n1"], "sample_outputs": ["6", "0"], "notes": null}, "src_uid": "d73d9610e3800817a3109314b1e6f88c"}
{"nl": {"description": "DO YOU EXPECT ME TO FIND THIS OUT?WHAT BASE AND/XOR LANGUAGE INCLUDES string?DON'T BYTE OF MORE THAN YOU CAN CHEWYOU CAN ONLY DISTORT THE LARGEST OF MATHEMATICS SO FARSAYING \"ABRACADABRA\" WITHOUT A MAGIC AND WON'T DO YOU ANY GOODTHE LAST STACK RUPTURES. ALL DIE. OH, THE EMBARRASSMENT!I HAVE NO ARRAY AND I MUST SCREAMELEMENTS MAY NOT BE STORED IN WEST HYPERSPACE", "input_spec": "The first line of input data contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200910). The second line of input data contains n space-separated integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u200911).", "output_spec": "Output a single integer.", "sample_inputs": ["4\n2 5 3 1"], "sample_outputs": ["4"], "notes": null}, "src_uid": "f45c769556ac3f408f5542fa71a67d98"}
{"nl": {"description": "Vasya has a pile, that consists of some number of stones. $$$n$$$ times he either took one stone from the pile or added one stone to the pile. The pile was non-empty before each operation of taking one stone from the pile.You are given $$$n$$$ operations which Vasya has made. Find the minimal possible number of stones that can be in the pile after making these operations.", "input_spec": "The first line contains one positive integer $$$n$$$\u00a0\u2014 the number of operations, that have been made by Vasya ($$$1 \\leq n \\leq 100$$$). The next line contains the string $$$s$$$, consisting of $$$n$$$ symbols, equal to \"-\" (without quotes) or \"+\" (without quotes). If Vasya took the stone on $$$i$$$-th operation, $$$s_i$$$ is equal to \"-\" (without quotes), if added, $$$s_i$$$ is equal to \"+\" (without quotes).", "output_spec": "Print one integer\u00a0\u2014 the minimal possible number of stones that can be in the pile after these $$$n$$$ operations.", "sample_inputs": ["3\n---", "4\n++++", "2\n-+", "5\n++-++"], "sample_outputs": ["0", "4", "1", "3"], "notes": "NoteIn the first test, if Vasya had $$$3$$$ stones in the pile at the beginning, after making operations the number of stones will be equal to $$$0$$$. It is impossible to have less number of piles, so the answer is $$$0$$$. Please notice, that the number of stones at the beginning can't be less, than $$$3$$$, because in this case, Vasya won't be able to take a stone on some operation (the pile will be empty).In the second test, if Vasya had $$$0$$$ stones in the pile at the beginning, after making operations the number of stones will be equal to $$$4$$$. It is impossible to have less number of piles because after making $$$4$$$ operations the number of stones in the pile increases on $$$4$$$ stones. So, the answer is $$$4$$$.In the third test, if Vasya had $$$1$$$ stone in the pile at the beginning, after making operations the number of stones will be equal to $$$1$$$. It can be proved, that it is impossible to have less number of stones after making the operations.In the fourth test, if Vasya had $$$0$$$ stones in the pile at the beginning, after making operations the number of stones will be equal to $$$3$$$."}, "src_uid": "a593016e4992f695be7c7cd3c920d1ed"}
{"nl": {"description": "You are given two lists of non-zero digits.Let's call an integer pretty if its (base 10) representation has at least one digit from the first list and at least one digit from the second list. What is the smallest positive pretty integer?", "input_spec": "The first line contains two integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20099) \u2014 the lengths of the first and the second lists, respectively. The second line contains n distinct digits a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u20099) \u2014 the elements of the first list. The third line contains m distinct digits b1,\u2009b2,\u2009...,\u2009bm (1\u2009\u2264\u2009bi\u2009\u2264\u20099) \u2014 the elements of the second list.", "output_spec": "Print the smallest pretty integer.", "sample_inputs": ["2 3\n4 2\n5 7 6", "8 8\n1 2 3 4 5 6 7 8\n8 7 6 5 4 3 2 1"], "sample_outputs": ["25", "1"], "notes": "NoteIn the first example 25, 46, 24567 are pretty, as well as many other integers. The smallest among them is 25. 42 and 24 are not pretty because they don't have digits from the second list.In the second example all integers that have at least one digit different from 9 are pretty. It's obvious that the smallest among them is 1, because it's the smallest positive integer."}, "src_uid": "3a0c1b6d710fd8f0b6daf420255d76ee"}
{"nl": {"description": "Btoh yuo adn yuor roomatme lhoate wianshg disehs, btu stlil sdmoeboy msut peorrfm tihs cohre dialy. Oen dya yuo decdie to idourtcne smoe syestm. Yuor rmmotaoe sstgegus teh fooniwllg dael. Yuo argee on tow arayrs of ientgres M adn R, nmebur upmicnog dyas (induiclng teh cunrret oen) wtih sicsescuve irnegets (teh ceurrnt dya is zreo), adn yuo wsah teh diehss on dya D if adn olny if terhe etsixs an iednx i scuh taht D\u00a0mod\u00a0M[i]\u2009=\u2009R[i], otwsehrie yuor rmootmae deos it. Yuo lkie teh cncepot, btu yuor rmotaome's cuinnng simle meaks yuo ssecupt sthnoemig, so yuo itennd to vefriy teh fnerisas of teh aemnrgeet.Yuo aer geivn ayarrs M adn R. Cuaclatle teh pceanregte of dyas on wchih yuo edn up dnoig teh wisahng. Amsuse taht yuo hvae iiiftlneny mnay dyas aehad of yuo. ", "input_spec": "The first line of input contains a single integer N (1\u2009\u2264\u2009N\u2009\u2264\u200916). The second and third lines of input contain N integers each, all between 0 and 16, inclusive, and represent arrays M and R, respectively. All M[i] are positive, for each i R[i]\u2009<\u2009M[i].", "output_spec": "Output a single real number. The answer is considered to be correct if its absolute or relative error does not exceed 10\u2009-\u20094.", "sample_inputs": ["1\n2\n0", "2\n2 3\n1 0"], "sample_outputs": ["0.500000", "0.666667"], "notes": null}, "src_uid": "14b69f42bc192ea472e82f3a3209f1c1"}
{"nl": {"description": "Attention: we lost all the test cases for this problem, so instead of solving the problem, we need you to generate test cases. We're going to give you the answer, and you need to print a test case that produces the given answer. The original problem is in the following paragraph.People don't use cash as often as they used to. Having a credit card solves some of the hassles of cash, such as having to receive change when you can't form the exact amount of money needed to purchase an item. Typically cashiers will give you as few coins as possible in change, but they don't have to. For example, if your change is 30 cents, a cashier could give you a 5 cent piece and a 25 cent piece, or they could give you three 10 cent pieces, or ten 1 cent pieces, two 5 cent pieces, and one 10 cent piece. Altogether there are 18 different ways to make 30 cents using only 1 cent pieces, 5 cent pieces, 10 cent pieces, and 25 cent pieces. Two ways are considered different if they contain a different number of at least one type of coin. Given the denominations of the coins and an amount of change to be made, how many different ways are there to make change?As we mentioned before, we lost all the test cases for this problem, so we're actually going to give you the number of ways, and want you to produce a test case for which the number of ways is the given number. There could be many ways to achieve this (we guarantee there's always at least one), so you can print any, as long as it meets the constraints described below.", "input_spec": "Input will consist of a single integer A (1\u2009\u2264\u2009A\u2009\u2264\u2009105), the desired number of ways.", "output_spec": "In the first line print integers N and M (1\u2009\u2264\u2009N\u2009\u2264\u2009106,\u20091\u2009\u2264\u2009M\u2009\u2264\u200910), the amount of change to be made, and the number of denominations, respectively. Then print M integers D1,\u2009D2,\u2009...,\u2009DM (1\u2009\u2264\u2009Di\u2009\u2264\u2009106), the denominations of the coins. All denominations must be distinct: for any i\u2009\u2260\u2009j we must have Di\u2009\u2260\u2009Dj. If there are multiple tests, print any of them. You can print denominations in atbitrary order.", "sample_inputs": ["18", "3", "314"], "sample_outputs": ["30 4\n1 5 10 25", "20 2\n5 2", "183 4\n6 5 2 139"], "notes": null}, "src_uid": "5c000b4c82a8ecef764f53fda8cee541"}
{"nl": {"description": "Dima and Inna are doing so great! At the moment, Inna is sitting on the magic lawn playing with a pink pony. Dima wanted to play too. He brought an n\u2009\u00d7\u2009m chessboard, a very tasty candy and two numbers a and b.Dima put the chessboard in front of Inna and placed the candy in position (i,\u2009j) on the board. The boy said he would give the candy if it reaches one of the corner cells of the board. He's got one more condition. There can only be actions of the following types:  move the candy from position (x,\u2009y) on the board to position (x\u2009-\u2009a,\u2009y\u2009-\u2009b);  move the candy from position (x,\u2009y) on the board to position (x\u2009+\u2009a,\u2009y\u2009-\u2009b);  move the candy from position (x,\u2009y) on the board to position (x\u2009-\u2009a,\u2009y\u2009+\u2009b);  move the candy from position (x,\u2009y) on the board to position (x\u2009+\u2009a,\u2009y\u2009+\u2009b). Naturally, Dima doesn't allow to move the candy beyond the chessboard borders.Inna and the pony started shifting the candy around the board. They wonder what is the minimum number of allowed actions that they need to perform to move the candy from the initial position (i,\u2009j) to one of the chessboard corners. Help them cope with the task! ", "input_spec": "The first line of the input contains six integers n,\u2009m,\u2009i,\u2009j,\u2009a,\u2009b (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009106;\u00a01\u2009\u2264\u2009i\u2009\u2264\u2009n;\u00a01\u2009\u2264\u2009j\u2009\u2264\u2009m;\u00a01\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009106). You can assume that the chessboard rows are numbered from 1 to n from top to bottom and the columns are numbered from 1 to m from left to right. Position (i,\u2009j) in the statement is a chessboard cell on the intersection of the i-th row and the j-th column. You can consider that the corners are: (1,\u2009m), (n,\u20091), (n,\u2009m), (1,\u20091).", "output_spec": "In a single line print a single integer \u2014 the minimum number of moves needed to get the candy. If Inna and the pony cannot get the candy playing by Dima's rules, print on a single line \"Poor Inna and pony!\" without the quotes.", "sample_inputs": ["5 7 1 3 2 2", "5 5 2 3 1 1"], "sample_outputs": ["2", "Poor Inna and pony!"], "notes": "NoteNote to sample 1:Inna and the pony can move the candy to position (1\u2009+\u20092,\u20093\u2009+\u20092)\u2009=\u2009(3,\u20095), from there they can move it to positions (3\u2009-\u20092,\u20095\u2009+\u20092)\u2009=\u2009(1,\u20097) and (3\u2009+\u20092,\u20095\u2009+\u20092)\u2009=\u2009(5,\u20097). These positions correspond to the corner squares of the chess board. Thus, the answer to the test sample equals two."}, "src_uid": "51155e9bfa90e0ff29d049cedc3e1862"}
{"nl": {"description": "You are planning to build housing on a street. There are $$$n$$$ spots available on the street on which you can build a house. The spots are labeled from $$$1$$$ to $$$n$$$ from left to right. In each spot, you can build a house with an integer height between $$$0$$$ and $$$h$$$.In each spot, if a house has height $$$a$$$, you will gain $$$a^2$$$ dollars from it.The city has $$$m$$$ zoning restrictions. The $$$i$$$-th restriction says that the tallest house from spots $$$l_i$$$ to $$$r_i$$$ (inclusive) must be at most $$$x_i$$$.You would like to build houses to maximize your profit. Determine the maximum profit possible.", "input_spec": "The first line contains three integers $$$n$$$, $$$h$$$, and $$$m$$$ ($$$1 \\leq n,h,m \\leq 50$$$)\u00a0\u2014 the number of spots, the maximum height, and the number of restrictions. Each of the next $$$m$$$ lines contains three integers $$$l_i$$$, $$$r_i$$$, and $$$x_i$$$ ($$$1 \\leq l_i \\leq r_i \\leq n$$$, $$$0 \\leq x_i \\leq h$$$)\u00a0\u2014 left and right limits (inclusive) of the $$$i$$$-th restriction and the maximum possible height in that range.", "output_spec": "Print a single integer, the maximum profit you can make.", "sample_inputs": ["3 3 3\n1 1 1\n2 2 3\n3 3 2", "4 10 2\n2 3 8\n3 4 7"], "sample_outputs": ["14", "262"], "notes": "NoteIn the first example, there are $$$3$$$ houses, the maximum height of a house is $$$3$$$, and there are $$$3$$$ restrictions. The first restriction says the tallest house between $$$1$$$ and $$$1$$$ must be at most $$$1$$$. The second restriction says the tallest house between $$$2$$$ and $$$2$$$ must be at most $$$3$$$. The third restriction says the tallest house between $$$3$$$ and $$$3$$$ must be at most $$$2$$$.In this case, it is optimal to build houses with heights $$$[1, 3, 2]$$$. This fits within all the restrictions. The total profit in this case is $$$1^2 + 3^2 + 2^2 = 14$$$.In the second example, there are $$$4$$$ houses, the maximum height of a house is $$$10$$$, and there are $$$2$$$ restrictions. The first restriction says the tallest house from $$$2$$$ to $$$3$$$ must be at most $$$8$$$. The second restriction says the tallest house from $$$3$$$ to $$$4$$$ must be at most $$$7$$$.In this case, it's optimal to build houses with heights $$$[10, 8, 7, 7]$$$. We get a profit of $$$10^2+8^2+7^2+7^2 = 262$$$. Note that there are two restrictions on house $$$3$$$ and both of them must be satisfied. Also, note that even though there isn't any explicit restrictions on house $$$1$$$, we must still limit its height to be at most $$$10$$$ ($$$h=10$$$)."}, "src_uid": "f22b6dab443f63fb8d2d288b702f20ad"}
{"nl": {"description": "What are you doing at the end of the world? Are you busy? Will you save us?Nephren is playing a game with little leprechauns.She gives them an infinite array of strings, f0... \u221e.f0 is \"What are you doing at the end of the world? Are you busy? Will you save us?\".She wants to let more people know about it, so she defines fi\u2009=\u2009 \"What are you doing while sending \"fi\u2009-\u20091\"? Are you busy? Will you send \"fi\u2009-\u20091\"?\" for all i\u2009\u2265\u20091.For example, f1 is\"What are you doing while sending \"What are you doing at the end of the world? Are you busy? Will you save us?\"? Are you busy? Will you send \"What are you doing at the end of the world? Are you busy? Will you save us?\"?\". Note that the quotes in the very beginning and in the very end are for clarity and are not a part of f1.It can be seen that the characters in fi are letters, question marks, (possibly) quotation marks and spaces.Nephren will ask the little leprechauns q times. Each time she will let them find the k-th character of fn. The characters are indexed starting from 1. If fn consists of less than k characters, output '.' (without quotes).Can you answer her queries?", "input_spec": "The first line contains one integer q (1\u2009\u2264\u2009q\u2009\u2264\u200910)\u00a0\u2014 the number of Nephren's questions. Each of the next q lines describes Nephren's question and contains two integers n and k (0\u2009\u2264\u2009n\u2009\u2264\u2009105,\u20091\u2009\u2264\u2009k\u2009\u2264\u20091018).", "output_spec": "One line containing q characters. The i-th character in it should be the answer for the i-th query.", "sample_inputs": ["3\n1 1\n1 2\n1 111111111111", "5\n0 69\n1 194\n1 139\n0 47\n1 66", "10\n4 1825\n3 75\n3 530\n4 1829\n4 1651\n3 187\n4 584\n4 255\n4 774\n2 474"], "sample_outputs": ["Wh.", "abdef", "Areyoubusy"], "notes": "NoteFor the first two examples, refer to f0 and f1 given in the legend."}, "src_uid": "da09a893a33f2bf8fd00e321e16ab149"}
{"nl": {"description": "Fox Ciel has some flowers: r red flowers, g green flowers and b blue flowers. She wants to use these flowers to make several bouquets. There are 4 types of bouquets:  To make a \"red bouquet\", it needs 3 red flowers.  To make a \"green bouquet\", it needs 3 green flowers.  To make a \"blue bouquet\", it needs 3 blue flowers.  To make a \"mixing bouquet\", it needs 1 red, 1 green and 1 blue flower. Help Fox Ciel to find the maximal number of bouquets she can make.", "input_spec": "The first line contains three integers r, g and b (0\u2009\u2264\u2009r,\u2009g,\u2009b\u2009\u2264\u2009109) \u2014 the number of red, green and blue flowers.", "output_spec": "Print the maximal number of bouquets Fox Ciel can make.", "sample_inputs": ["3 6 9", "4 4 4", "0 0 0"], "sample_outputs": ["6", "4", "0"], "notes": "NoteIn test case 1, we can make 1 red bouquet, 2 green bouquets and 3 blue bouquets.In test case 2, we can make 1 red, 1 green, 1 blue and 1 mixing bouquet."}, "src_uid": "acddc9b0db312b363910a84bd4f14d8e"}
{"nl": {"description": "There are n cards (n is even) in the deck. Each card has a positive integer written on it. n\u2009/\u20092 people will play new card game. At the beginning of the game each player gets two cards, each card is given to exactly one player. Find the way to distribute cards such that the sum of values written of the cards will be equal for each player. It is guaranteed that it is always possible.", "input_spec": "The first line of the input contains integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of cards in the deck. It is guaranteed that n is even. The second line contains the sequence of n positive integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009100), where ai is equal to the number written on the i-th card.", "output_spec": "Print n\u2009/\u20092 pairs of integers, the i-th pair denote the cards that should be given to the i-th player. Each card should be given to exactly one player. Cards are numbered in the order they appear in the input. It is guaranteed that solution exists. If there are several correct answers, you are allowed to print any of them.", "sample_inputs": ["6\n1 5 7 4 4 3", "4\n10 10 10 10"], "sample_outputs": ["1 3\n6 2\n4 5", "1 2\n3 4"], "notes": "NoteIn the first sample, cards are distributed in such a way that each player has the sum of numbers written on his cards equal to 8. In the second sample, all values ai are equal. Thus, any distribution is acceptable."}, "src_uid": "6e5011801ceff9d76e33e0908b695132"}
{"nl": {"description": "A prime number is a number which has exactly two distinct divisors: one and itself. For example, numbers 2, 7, 3 are prime, and 1, 6, 4 are not.The next prime number after x is the smallest prime number greater than x. For example, the next prime number after 2 is 3, and the next prime number after 3 is 5. Note that there is exactly one next prime number after each number. So 5 is\u00a0not the next prime number for 2.One cold April morning Panoramix predicted that soon Kakofonix will break free from his straitjacket, and this will be a black day for the residents of the Gallic countryside.Panoramix's prophecy tells that if some day Asterix and Obelix beat exactly x Roman soldiers, where x is a prime number, and next day they beat exactly y Roman soldiers, where y is the next prime number after x, then it's time to wait for Armageddon, for nothing can shut Kakofonix up while he sings his infernal song.Yesterday the Gauls beat n Roman soldiers and it turned out that the number n was prime! Today their victims were a troop of m Romans (m\u2009>\u2009n). Determine whether the Gauls should wait for the black day after today's victory of Asterix and Obelix?", "input_spec": "The first and only input line contains two positive integers \u2014 n and m (2\u2009\u2264\u2009n\u2009<\u2009m\u2009\u2264\u200950). It is guaranteed that n is prime. Pretests contain all the cases with restrictions 2\u2009\u2264\u2009n\u2009<\u2009m\u2009\u2264\u20094.", "output_spec": "Print YES, if m is the next prime number after n, or NO otherwise.", "sample_inputs": ["3 5", "7 11", "7 9"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "9d52ff51d747bb59aa463b6358258865"}
{"nl": {"description": "The Fat Rat and his friend \u0421erealguy have had a bet whether at least a few oats are going to descend to them by some clever construction. The figure below shows the clever construction.  A more formal description of the clever construction is as follows. The clever construction consists of n rows with scales. The first row has n scales, the second row has (n\u2009-\u20091) scales, the i-th row has (n\u2009-\u2009i\u2009+\u20091) scales, the last row has exactly one scale. Let's number the scales in each row from the left to the right, starting from 1. Then the value of wi,\u2009k in kilograms (1\u2009\u2264\u2009i\u2009\u2264\u2009n;\u00a01\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009-\u2009i\u2009+\u20091) is the weight capacity parameter of the k-th scale in the i-th row. If a body whose mass is not less than wi,\u2009k falls on the scale with weight capacity wi,\u2009k, then the scale breaks. At that anything that the scale has on it, either falls one level down to the left (if possible) or one level down to the right (if possible). In other words, if the scale wi,\u2009k (i\u2009<\u2009n) breaks, then there are at most two possible variants in which the contents of the scale's pan can fall out: all contents of scale wi,\u2009k falls either on scale wi\u2009+\u20091,\u2009k\u2009-\u20091 (if it exists), or on scale wi\u2009+\u20091,\u2009k (if it exists). If scale wn,\u20091 breaks, then all its contents falls right in the Fat Rat's claws. Please note that the scales that are the first and the last in a row, have only one variant of dropping the contents.Initially, oats are simultaneously put on all scales of the first level. The i-th scale has ai kilograms of oats put on it. After that the scales start breaking and the oats start falling down in some way. You can consider everything to happen instantly. That is, the scale breaks instantly and the oats also fall instantly.The Fat Rat is sure that whatever happens, he will not get the oats from the first level. Cerealguy is sure that there is such a scenario, when the rat gets at least some number of the oats. Help the Fat Rat and the Cerealguy. Determine, which one is right.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200950) \u2014 the number of rows with scales. The next line contains n space-separated integers ai (1\u2009\u2264\u2009ai\u2009\u2264\u2009106) \u2014 the masses of the oats in kilograms. The next n lines contain descriptions of the scales: the i-th line contains (n\u2009-\u2009i\u2009+\u20091) space-separated integers wi,\u2009k (1\u2009\u2264\u2009wi,\u2009k\u2009\u2264\u2009106) \u2014 the weight capacity parameters for the scales that stand on the i-th row, in kilograms.", "output_spec": "Print \"Fat Rat\" if the Fat Rat is right, otherwise print \"Cerealguy\".", "sample_inputs": ["1\n1\n2", "2\n2 2\n1 2\n4", "2\n2 2\n1 2\n5"], "sample_outputs": ["Fat Rat", "Cerealguy", "Fat Rat"], "notes": "NoteNotes to the examples:   The first example: the scale with weight capacity 2 gets 1. That means that the lower scale don't break.  The second sample: all scales in the top row obviously break. Then the oats fall on the lower row. Their total mass is 4,and that's exactly the weight that the lower scale can \"nearly endure\". So, as 4 \u2009\u2265\u2009 4, the scale breaks."}, "src_uid": "0a77937c01ac69490f8b478eae77de1d"}
{"nl": {"description": "Valera came to Japan and bought many robots for his research. He's already at the airport, the plane will fly very soon and Valera urgently needs to bring all robots to the luggage compartment.The robots are self-propelled (they can potentially move on their own), some of them even have compartments to carry other robots. More precisely, for the i-th robot we know value ci \u2014 the number of robots it can carry. In this case, each of ci transported robots can additionally carry other robots.However, the robots need to be filled with fuel to go, so Valera spent all his last money and bought S liters of fuel. He learned that each robot has a restriction on travel distances. Thus, in addition to features ci, the i-th robot has two features fi and li \u2014 the amount of fuel (in liters) needed to move the i-th robot, and the maximum distance that the robot can go.Due to the limited amount of time and fuel, Valera wants to move the maximum number of robots to the luggage compartment. He operates as follows.   First Valera selects some robots that will travel to the luggage compartment on their own. In this case the total amount of fuel required to move all these robots must not exceed S.  Then Valera seats the robots into the compartments, so as to transport as many robots as possible. Note that if a robot doesn't move by itself, you can put it in another not moving robot that is moved directly or indirectly by a moving robot.  After that all selected and seated robots along with Valera go to the luggage compartment and the rest robots will be lost. There are d meters to the luggage compartment. Therefore, the robots that will carry the rest, must have feature li of not less than d. During the moving Valera cannot stop or change the location of the robots in any way.Help Valera calculate the maximum number of robots that he will be able to take home, and the minimum amount of fuel he will have to spend, because the remaining fuel will come in handy in Valera's research.", "input_spec": "The first line contains three space-separated integers n,\u2009d,\u2009S (1\u2009\u2264\u2009n\u2009\u2264\u2009105,\u20091\u2009\u2264\u2009d,\u2009S\u2009\u2264\u2009109). The first number represents the number of robots, the second one \u2014 the distance to the luggage compartment and the third one \u2014 the amount of available fuel. Next n lines specify the robots. The i-th line contains three space-separated integers ci,\u2009fi,\u2009li (0\u2009\u2264\u2009ci,\u2009fi,\u2009li\u2009\u2264\u2009109) \u2014 the i-th robot's features. The first number is the number of robots the i-th robot can carry, the second number is the amount of fuel needed for the i-th robot to move and the third one shows the maximum distance the i-th robot can go.", "output_spec": "Print two space-separated integers \u2014 the maximum number of robots Valera can transport to the luggage compartment and the minimum amount of fuel he will need for that. If Valera won't manage to get any robots to the luggage compartment, print two zeroes.", "sample_inputs": ["3 10 10\n0 12 10\n1 6 10\n0 1 1", "2 7 10\n3 12 10\n5 16 8", "4 8 10\n0 12 3\n1 1 0\n0 3 11\n1 6 9"], "sample_outputs": ["2 6", "0 0", "4 9"], "notes": null}, "src_uid": "e69f42403f3b0357e06a14523025b34a"}
{"nl": {"description": "You are developing a new feature for the website which sells airline tickets: being able to sort tickets by price! You have already extracted the tickets' prices, so there's just the last step to be done...You are given an array of integers. Sort it in non-descending order.", "input_spec": "The input consists of a single line of space-separated integers. The first number is n (1\u2009\u2264\u2009n\u2009\u2264\u200910) \u2014 the size of the array. The following n numbers are the elements of the array (1\u2009\u2264\u2009ai\u2009\u2264\u2009100).", "output_spec": "Output space-separated elements of the sorted array.", "sample_inputs": ["3 3 1 2"], "sample_outputs": ["1 2 3"], "notes": "NoteRemember, this is a very important feature, and you have to make sure the customers appreciate it!"}, "src_uid": "29e481abfa9ad1f18e6157c9e833f16e"}
{"nl": {"description": "Given an integer $$$x$$$, find 2 integers $$$a$$$ and $$$b$$$ such that:   $$$1 \\le a,b \\le x$$$  $$$b$$$ divides $$$a$$$ ($$$a$$$ is divisible by $$$b$$$).  $$$a \\cdot b>x$$$.  $$$\\frac{a}{b}<x$$$. ", "input_spec": "The only line contains the integer $$$x$$$ $$$(1 \\le x \\le 100)$$$.", "output_spec": "You should output two integers $$$a$$$ and $$$b$$$, satisfying the given conditions, separated by a space. If no pair of integers satisfy the conditions above, print \"-1\" (without quotes).", "sample_inputs": ["10", "1"], "sample_outputs": ["6 3", "-1"], "notes": null}, "src_uid": "883f67177474d23d7a320d9dbfa70dd3"}
{"nl": {"description": "$$$k$$$ people want to split $$$n$$$ candies between them. Each candy should be given to exactly one of them or be thrown away.The people are numbered from $$$1$$$ to $$$k$$$, and Arkady is the first of them. To split the candies, Arkady will choose an integer $$$x$$$ and then give the first $$$x$$$ candies to himself, the next $$$x$$$ candies to the second person, the next $$$x$$$ candies to the third person and so on in a cycle. The leftover (the remainder that is not divisible by $$$x$$$) will be thrown away.Arkady can't choose $$$x$$$ greater than $$$M$$$ as it is considered greedy. Also, he can't choose such a small $$$x$$$ that some person will receive candies more than $$$D$$$ times, as it is considered a slow splitting.Please find what is the maximum number of candies Arkady can receive by choosing some valid $$$x$$$.", "input_spec": "The only line contains four integers $$$n$$$, $$$k$$$, $$$M$$$ and $$$D$$$ ($$$2 \\le n \\le 10^{18}$$$, $$$2 \\le k \\le n$$$, $$$1 \\le M \\le n$$$, $$$1 \\le D \\le \\min{(n, 1000)}$$$, $$$M \\cdot D \\cdot k \\ge n$$$)\u00a0\u2014 the number of candies, the number of people, the maximum number of candies given to a person at once, the maximum number of times a person can receive candies.", "output_spec": "Print a single integer\u00a0\u2014 the maximum possible number of candies Arkady can give to himself. Note that it is always possible to choose some valid $$$x$$$.", "sample_inputs": ["20 4 5 2", "30 9 4 1"], "sample_outputs": ["8", "4"], "notes": "NoteIn the first example Arkady should choose $$$x = 4$$$. He will give $$$4$$$ candies to himself, $$$4$$$ candies to the second person, $$$4$$$ candies to the third person, then $$$4$$$ candies to the fourth person and then again $$$4$$$ candies to himself. No person is given candies more than $$$2$$$ times, and Arkady receives $$$8$$$ candies in total.Note that if Arkady chooses $$$x = 5$$$, he will receive only $$$5$$$ candies, and if he chooses $$$x = 3$$$, he will receive only $$$3 + 3 = 6$$$ candies as well as the second person, the third and the fourth persons will receive $$$3$$$ candies, and $$$2$$$ candies will be thrown away. He can't choose $$$x = 1$$$ nor $$$x = 2$$$ because in these cases he will receive candies more than $$$2$$$ times.In the second example Arkady has to choose $$$x = 4$$$, because any smaller value leads to him receiving candies more than $$$1$$$ time."}, "src_uid": "ac2e795cd44061db8da13e3947ba791b"}
{"nl": {"description": "Having learned (not without some help from the Codeforces participants) to play the card game from the previous round optimally, Shrek and Donkey (as you may remember, they too live now in the Kingdom of Far Far Away) have decided to quit the boring card games and play with toy soldiers.The rules of the game are as follows: there is a battlefield, its size equals n\u2009\u00d7\u2009m squares, some squares contain the toy soldiers (the green ones belong to Shrek and the red ones belong to Donkey). Besides, each of the n lines of the area contains not more than two soldiers. During a move a players should select not less than 1 and not more than k soldiers belonging to him and make them either attack or retreat.An attack is moving all of the selected soldiers along the lines on which they stand in the direction of an enemy soldier, if he is in this line. If this line doesn't have an enemy soldier, then the selected soldier on this line can move in any direction during the player's move. Each selected soldier has to move at least by one cell. Different soldiers can move by a different number of cells. During the attack the soldiers are not allowed to cross the cells where other soldiers stand (or stood immediately before the attack). It is also not allowed to go beyond the battlefield or finish the attack in the cells, where other soldiers stand (or stood immediately before attack).A retreat is moving all of the selected soldiers along the lines on which they stand in the direction from an enemy soldier, if he is in this line. The other rules repeat the rules of the attack.For example, let's suppose that the original battlefield had the form (here symbols \"G\" mark Shrek's green soldiers and symbols \"R\" mark Donkey's red ones):  -G-R--R-G-  Let's suppose that k\u2009=\u20092 and Shrek moves first. If he decides to attack, then after his move the battlefield can look like that:  --GR-     --GR-     -G-R--RG--     -R-G-     -RG--  If in the previous example Shrek decides to retreat, then after his move the battlefield can look like that:  G--R-     G--R-     -G-R--R--G     -R-G-     -R--G  On the other hand, the followings fields cannot result from Shrek's correct move:  G--R-     ---RG     --GR--RG--     -R-G-     GR---  Shrek starts the game. To make a move means to attack or to retreat by the rules. A player who cannot make a move loses and his opponent is the winner. Determine the winner of the given toy soldier game if Shrek and Donkey continue to be under the yellow pills from the last rounds' problem. Thus, they always play optimally (that is, they try to win if it is possible, or finish the game in a draw, by ensuring that it lasts forever, if they cannot win).", "input_spec": "The first line contains space-separated integers n, m and k (1\u2009\u2264\u2009n,\u2009m,\u2009k\u2009\u2264\u2009100). Then n lines contain m characters each. These characters belong to the set {\"-\", \"G\", \"R\"}, denoting, respectively, a battlefield's free cell, a cell occupied by Shrek's soldiers and a cell occupied by Donkey's soldiers. It is guaranteed that each line contains no more than two soldiers.", "output_spec": "Print \"First\" (without the quotes) if Shrek wins in the given Toy Soldier game. If Donkey wins, print \"Second\" (without the quotes). If the game continues forever, print \"Draw\" (also without the quotes).", "sample_inputs": ["2 3 1\nR-G\nRG-", "3 3 2\nG-R\nR-G\nG-R", "2 3 1\n-R-\n-G-", "2 5 2\n-G-R-\n-R-G-"], "sample_outputs": ["First", "Second", "Draw", "First"], "notes": null}, "src_uid": "69062f7c9b834e925ab23ebc2da96b52"}
{"nl": {"description": "Pak Chanek plans to build a garage. He wants the garage to consist of a square and a right triangle that are arranged like the following illustration.  Define $$$a$$$ and $$$b$$$ as the lengths of two of the sides in the right triangle as shown in the illustration. An integer $$$x$$$ is suitable if and only if we can construct a garage with assigning positive integer values for the lengths $$$a$$$ and $$$b$$$ ($$$a<b$$$) so that the area of the square at the bottom is exactly $$$x$$$. As a good friend of Pak Chanek, you are asked to help him find the $$$N$$$-th smallest suitable number.", "input_spec": "The only line contains a single integer $$$N$$$ ($$$1 \\leq N \\leq 10^9$$$).", "output_spec": "An integer that represents the $$$N$$$-th smallest suitable number.", "sample_inputs": ["3"], "sample_outputs": ["7"], "notes": "NoteThe $$$3$$$-rd smallest suitable number is $$$7$$$. A square area of $$$7$$$ can be obtained by assigning $$$a=3$$$ and $$$b=4$$$."}, "src_uid": "d0a8604b78ba19ab769fd1ec90a72e4e"}
{"nl": {"description": "You are given a tetrahedron. Let's mark its vertices with letters A, B, C and D correspondingly.  An ant is standing in the vertex D of the tetrahedron. The ant is quite active and he wouldn't stay idle. At each moment of time he makes a step from one vertex to another one along some edge of the tetrahedron. The ant just can't stand on one place.You do not have to do much to solve the problem: your task is to count the number of ways in which the ant can go from the initial vertex D to itself in exactly n steps. In other words, you are asked to find out the number of different cyclic paths with the length of n from vertex D to itself. As the number can be quite large, you should print it modulo 1000000007 (109\u2009+\u20097). ", "input_spec": "The first line contains the only integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009107) \u2014 the required length of the cyclic path.", "output_spec": "Print the only integer \u2014 the required number of ways modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["2", "4"], "sample_outputs": ["3", "21"], "notes": "NoteThe required paths in the first sample are:   D\u2009-\u2009A\u2009-\u2009D  D\u2009-\u2009B\u2009-\u2009D  D\u2009-\u2009C\u2009-\u2009D "}, "src_uid": "77627cc366a22e38da412c3231ac91a8"}
{"nl": {"description": "THE SxPLAY & KIV\u039b - \u6f02\u6d41 KIV\u039b & Nikki Simmons - PerspectivesWith a new body, our idol Aroma White (or should we call her Kaori Minamiya?) begins to uncover her lost past through the OS space.The space can be considered a 2D plane, with an infinite number of data nodes, indexed from $$$0$$$, with their coordinates defined as follows:  The coordinates of the $$$0$$$-th node is $$$(x_0, y_0)$$$  For $$$i > 0$$$, the coordinates of $$$i$$$-th node is $$$(a_x \\cdot x_{i-1} + b_x, a_y \\cdot y_{i-1} + b_y)$$$ Initially Aroma stands at the point $$$(x_s, y_s)$$$. She can stay in OS space for at most $$$t$$$ seconds, because after this time she has to warp back to the real world. She doesn't need to return to the entry point $$$(x_s, y_s)$$$ to warp home.While within the OS space, Aroma can do the following actions:  From the point $$$(x, y)$$$, Aroma can move to one of the following points: $$$(x-1, y)$$$, $$$(x+1, y)$$$, $$$(x, y-1)$$$ or $$$(x, y+1)$$$. This action requires $$$1$$$ second.  If there is a data node at where Aroma is staying, she can collect it. We can assume this action costs $$$0$$$ seconds. Of course, each data node can be collected at most once. Aroma wants to collect as many data as possible before warping back. Can you help her in calculating the maximum number of data nodes she could collect within $$$t$$$ seconds?", "input_spec": "The first line contains integers $$$x_0$$$, $$$y_0$$$, $$$a_x$$$, $$$a_y$$$, $$$b_x$$$, $$$b_y$$$ ($$$1 \\leq x_0, y_0 \\leq 10^{16}$$$, $$$2 \\leq a_x, a_y \\leq 100$$$, $$$0 \\leq b_x, b_y \\leq 10^{16}$$$), which define the coordinates of the data nodes. The second line contains integers $$$x_s$$$, $$$y_s$$$, $$$t$$$ ($$$1 \\leq x_s, y_s, t \\leq 10^{16}$$$)\u00a0\u2013 the initial Aroma's coordinates and the amount of time available.", "output_spec": "Print a single integer\u00a0\u2014 the maximum number of data nodes Aroma can collect within $$$t$$$ seconds.", "sample_inputs": ["1 1 2 3 1 0\n2 4 20", "1 1 2 3 1 0\n15 27 26", "1 1 2 3 1 0\n2 2 1"], "sample_outputs": ["3", "2", "0"], "notes": "NoteIn all three examples, the coordinates of the first $$$5$$$ data nodes are $$$(1, 1)$$$, $$$(3, 3)$$$, $$$(7, 9)$$$, $$$(15, 27)$$$ and $$$(31, 81)$$$ (remember that nodes are numbered from $$$0$$$).In the first example, the optimal route to collect $$$3$$$ nodes is as follows:   Go to the coordinates $$$(3, 3)$$$ and collect the $$$1$$$-st node. This takes $$$|3 - 2| + |3 - 4| = 2$$$ seconds.  Go to the coordinates $$$(1, 1)$$$ and collect the $$$0$$$-th node. This takes $$$|1 - 3| + |1 - 3| = 4$$$ seconds.  Go to the coordinates $$$(7, 9)$$$ and collect the $$$2$$$-nd node. This takes $$$|7 - 1| + |9 - 1| = 14$$$ seconds. In the second example, the optimal route to collect $$$2$$$ nodes is as follows:   Collect the $$$3$$$-rd node. This requires no seconds.  Go to the coordinates $$$(7, 9)$$$ and collect the $$$2$$$-th node. This takes $$$|15 - 7| + |27 - 9| = 26$$$ seconds. In the third example, Aroma can't collect any nodes. She should have taken proper rest instead of rushing into the OS space like that."}, "src_uid": "d8a7ae2959b3781a8a4566a2f75a4e28"}
{"nl": {"description": "When new students come to the Specialized Educational and Scientific Centre (SESC) they need to start many things from the beginning. Sometimes the teachers say (not always unfairly) that we cannot even count. So our teachers decided to teach us arithmetics from the start. And what is the best way to teach students add and subtract? \u2014 That's right, using counting sticks! An here's our new task: An expression of counting sticks is an expression of type:[ A sticks][sign +][B sticks][sign =][C sticks] (1\u2009\u2264\u2009A,\u2009B,\u2009C).  Sign + consists of two crossed sticks: one vertical and one horizontal. Sign = consists of two horizontal sticks. The expression is arithmetically correct if A\u2009+\u2009B\u2009=\u2009C.We've got an expression that looks like A\u2009+\u2009B\u2009=\u2009C given by counting sticks. Our task is to shift at most one stick (or we can shift nothing) so that the expression became arithmetically correct. Note that we cannot remove the sticks from the expression, also we cannot shift the sticks from the signs + and =.We really aren't fabulous at arithmetics. Can you help us?", "input_spec": "The single line contains the initial expression. It is guaranteed that the expression looks like A\u2009+\u2009B\u2009=\u2009C, where 1\u2009\u2264\u2009A,\u2009B,\u2009C\u2009\u2264\u2009100.", "output_spec": "If there isn't a way to shift the stick so the expression becomes correct, print on a single line \"Impossible\" (without the quotes). If there is a way, print the resulting expression. Follow the format of the output from the test samples. Don't print extra space characters. If there are multiple correct answers, print any of them. For clarifications, you are recommended to see the test samples.", "sample_inputs": ["||+|=|||||", "|||||+||=||", "|+|=||||||", "||||+||=||||||"], "sample_outputs": ["|||+|=||||", "Impossible", "Impossible", "||||+||=||||||"], "notes": "NoteIn the first sample we can shift stick from the third group of sticks to the first one.In the second sample we cannot shift vertical stick from + sign to the second group of sticks. So we cannot make a - sign.There is no answer in the third sample because we cannot remove sticks from the expression.In the forth sample the initial expression is already arithmetically correct and that is why we don't have to shift sticks."}, "src_uid": "ee0aaa7acf127e9f3a9edafc58f4e2d6"}
{"nl": {"description": "You are given n k-digit integers. You have to rearrange the digits in the integers so that the difference between the largest and the smallest number was minimum. Digits should be rearranged by the same rule in all integers.", "input_spec": "The first line contains integers n and k \u2014 the number and digit capacity of numbers correspondingly (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u20098). Next n lines contain k-digit positive integers. Leading zeroes are allowed both in the initial integers and the integers resulting from the rearranging of digits.", "output_spec": "Print a single number: the minimally possible difference between the largest and the smallest number after the digits are rearranged in all integers by the same rule.", "sample_inputs": ["6 4\n5237\n2753\n7523\n5723\n5327\n2537", "3 3\n010\n909\n012", "7 5\n50808\n36603\n37198\n44911\n29994\n42543\n50156"], "sample_outputs": ["2700", "3", "20522"], "notes": "NoteIn the first sample, if we rearrange the digits in numbers as (3,1,4,2), then the 2-nd and the 4-th numbers will equal 5237 and 2537 correspondingly (they will be maximum and minimum for such order of digits).In the second sample, if we swap the second digits and the first ones, we get integers 100, 99 and 102."}, "src_uid": "08f85cd4ffbd135f0b630235209273a4"}
{"nl": {"description": "You are given a rectangle grid. That grid's size is n\u2009\u00d7\u2009m. Let's denote the coordinate system on the grid. So, each point on the grid will have coordinates \u2014 a pair of integers (x,\u2009y) (0\u2009\u2264\u2009x\u2009\u2264\u2009n,\u20090\u2009\u2264\u2009y\u2009\u2264\u2009m).Your task is to find a maximum sub-rectangle on the grid (x1,\u2009y1,\u2009x2,\u2009y2) so that it contains the given point (x,\u2009y), and its length-width ratio is exactly (a,\u2009b). In other words the following conditions must hold: 0\u2009\u2264\u2009x1\u2009\u2264\u2009x\u2009\u2264\u2009x2\u2009\u2264\u2009n, 0\u2009\u2264\u2009y1\u2009\u2264\u2009y\u2009\u2264\u2009y2\u2009\u2264\u2009m, .The sides of this sub-rectangle should be parallel to the axes. And values x1,\u2009y1,\u2009x2,\u2009y2 should be integers.  If there are multiple solutions, find the rectangle which is closest to (x,\u2009y). Here \"closest\" means the Euclid distance between (x,\u2009y) and the center of the rectangle is as small as possible. If there are still multiple solutions, find the lexicographically minimum one. Here \"lexicographically minimum\" means that we should consider the sub-rectangle as sequence of integers (x1,\u2009y1,\u2009x2,\u2009y2), so we can choose the lexicographically minimum one.", "input_spec": "The first line contains six integers n,\u2009m,\u2009x,\u2009y,\u2009a,\u2009b (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009109,\u20090\u2009\u2264\u2009x\u2009\u2264\u2009n,\u20090\u2009\u2264\u2009y\u2009\u2264\u2009m,\u20091\u2009\u2264\u2009a\u2009\u2264\u2009n,\u20091\u2009\u2264\u2009b\u2009\u2264\u2009m).", "output_spec": "Print four integers x1,\u2009y1,\u2009x2,\u2009y2, which represent the founded sub-rectangle whose left-bottom point is (x1,\u2009y1) and right-up point is (x2,\u2009y2).", "sample_inputs": ["9 9 5 5 2 1", "100 100 52 50 46 56"], "sample_outputs": ["1 3 9 7", "17 8 86 92"], "notes": null}, "src_uid": "8f1211b995f35462ae83b2be27f54585"}
{"nl": {"description": "Let's consider a table consisting of n rows and n columns. The cell located at the intersection of i-th row and j-th column contains number i\u2009\u00d7\u2009j. The rows and columns are numbered starting from 1.You are given a positive integer x. Your task is to count the number of cells in a table that contain number x.", "input_spec": "The single line contains numbers n and x (1\u2009\u2264\u2009n\u2009\u2264\u2009105, 1\u2009\u2264\u2009x\u2009\u2264\u2009109) \u2014 the size of the table and the number that we are looking for in the table.", "output_spec": "Print a single number: the number of times x occurs in the table.", "sample_inputs": ["10 5", "6 12", "5 13"], "sample_outputs": ["2", "4", "0"], "notes": "NoteA table for the second sample test is given below. The occurrences of number 12 are marked bold.   "}, "src_uid": "c4b139eadca94201596f1305b2f76496"}
{"nl": {"description": "The only difference between easy and hard versions is constraints.A session has begun at Beland State University. Many students are taking exams.Polygraph Poligrafovich is going to examine a group of $$$n$$$ students. Students will take the exam one-by-one in order from $$$1$$$-th to $$$n$$$-th. Rules of the exam are following:  The $$$i$$$-th student randomly chooses a ticket.  if this ticket is too hard to the student, he doesn't answer and goes home immediately (this process is so fast that it's considered no time elapses). This student fails the exam.  if the student finds the ticket easy, he spends exactly $$$t_i$$$ minutes to pass the exam. After it, he immediately gets a mark and goes home. Students take the exam in the fixed order, one-by-one, without any interruption. At any moment of time, Polygraph Poligrafovich takes the answer from one student.The duration of the whole exam for all students is $$$M$$$ minutes ($$$\\max t_i \\le M$$$), so students at the end of the list have a greater possibility to run out of time to pass the exam.For each student $$$i$$$, you should count the minimum possible number of students who need to fail the exam so the $$$i$$$-th student has enough time to pass the exam.For each student $$$i$$$, find the answer independently. That is, if when finding the answer for the student $$$i_1$$$ some student $$$j$$$ should leave, then while finding the answer for $$$i_2$$$ ($$$i_2>i_1$$$) the student $$$j$$$ student does not have to go home.", "input_spec": "The first line of the input contains two integers $$$n$$$ and $$$M$$$ ($$$1 \\le n \\le 100$$$, $$$1 \\le M \\le 100$$$)\u00a0\u2014 the number of students and the total duration of the exam in minutes, respectively. The second line of the input contains $$$n$$$ integers $$$t_i$$$ ($$$1 \\le t_i \\le 100$$$)\u00a0\u2014 time in minutes that $$$i$$$-th student spends to answer to a ticket. It's guaranteed that all values of $$$t_i$$$ are not greater than $$$M$$$.", "output_spec": "Print $$$n$$$ numbers: the $$$i$$$-th number must be equal to the minimum number of students who have to leave the exam in order to $$$i$$$-th student has enough time to pass the exam.", "sample_inputs": ["7 15\n1 2 3 4 5 6 7", "5 100\n80 40 40 40 60"], "sample_outputs": ["0 0 0 0 0 2 3", "0 1 1 2 3"], "notes": "NoteThe explanation for the example 1.Please note that the sum of the first five exam times does not exceed $$$M=15$$$ (the sum is $$$1+2+3+4+5=15$$$). Thus, the first five students can pass the exam even if all the students before them also pass the exam. In other words, the first five numbers in the answer are $$$0$$$.In order for the $$$6$$$-th student to pass the exam, it is necessary that at least $$$2$$$ students must fail it before (for example, the $$$3$$$-rd and $$$4$$$-th, then the $$$6$$$-th will finish its exam in $$$1+2+5+6=14$$$ minutes, which does not exceed $$$M$$$).In order for the $$$7$$$-th student to pass the exam, it is necessary that at least $$$3$$$ students must fail it before (for example, the $$$2$$$-nd, $$$5$$$-th and $$$6$$$-th, then the $$$7$$$-th will finish its exam in $$$1+3+4+7=15$$$ minutes, which does not exceed $$$M$$$)."}, "src_uid": "d3c1dc3ed7af2b51b4c49c9b5052c346"}
{"nl": {"description": "Vasya works as a watchman in the gallery. Unfortunately, one of the most expensive paintings was stolen while he was on duty. He doesn't want to be fired, so he has to quickly restore the painting. He remembers some facts about it.  The painting is a square 3\u2009\u00d7\u20093, each cell contains a single integer from 1 to n, and different cells may contain either different or equal integers.  The sum of integers in each of four squares 2\u2009\u00d7\u20092 is equal to the sum of integers in the top left square 2\u2009\u00d7\u20092.  Four elements a, b, c and d are known and are located as shown on the picture below. Help Vasya find out the number of distinct squares the satisfy all the conditions above. Note, that this number may be equal to 0, meaning Vasya remembers something wrong.Two squares are considered to be different, if there exists a cell that contains two different integers in different squares.", "input_spec": "The first line of the input contains five integers n, a, b, c and d (1\u2009\u2264\u2009n\u2009\u2264\u2009100\u2009000, 1\u2009\u2264\u2009a,\u2009b,\u2009c,\u2009d\u2009\u2264\u2009n)\u00a0\u2014 maximum possible value of an integer in the cell and four integers that Vasya remembers.", "output_spec": "Print one integer\u00a0\u2014 the number of distinct valid squares.", "sample_inputs": ["2 1 1 1 2", "3 3 1 2 3"], "sample_outputs": ["2", "6"], "notes": "NoteBelow are all the possible paintings for the first sample.  In the second sample, only paintings displayed below satisfy all the rules.      "}, "src_uid": "b732869015baf3dee5094c51a309e32c"}
{"nl": {"description": "As you have noticed, there are lovely girls in Arpa\u2019s land.People in Arpa's land are numbered from 1 to n. Everyone has exactly one crush, i-th person's crush is person with the number crushi.  Someday Arpa shouted Owf loudly from the top of the palace and a funny game started in Arpa's land. The rules are as follows.The game consists of rounds. Assume person x wants to start a round, he calls crushx and says: \"Oww...wwf\" (the letter w is repeated t times) and cuts off the phone immediately. If t\u2009>\u20091 then crushx calls crushcrushx and says: \"Oww...wwf\" (the letter w is repeated t\u2009-\u20091 times) and cuts off the phone immediately. The round continues until some person receives an \"Owf\" (t\u2009=\u20091). This person is called the Joon-Joon of the round. There can't be two rounds at the same time.Mehrdad has an evil plan to make the game more funny, he wants to find smallest t (t\u2009\u2265\u20091) such that for each person x, if x starts some round and y becomes the Joon-Joon of the round, then by starting from y, x would become the Joon-Joon of the round. Find such t for Mehrdad if it's possible.Some strange fact in Arpa's land is that someone can be himself's crush (i.e. crushi\u2009=\u2009i).", "input_spec": "The first line of input contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of people in Arpa's land. The second line contains n integers, i-th of them is crushi (1\u2009\u2264\u2009crushi\u2009\u2264\u2009n)\u00a0\u2014 the number of i-th person's crush.", "output_spec": "If there is no t satisfying the condition, print -1. Otherwise print such smallest t.", "sample_inputs": ["4\n2 3 1 4", "4\n4 4 4 4", "4\n2 1 4 3"], "sample_outputs": ["3", "-1", "1"], "notes": "NoteIn the first sample suppose t\u2009=\u20093. If the first person starts some round:The first person calls the second person and says \"Owwwf\", then the second person calls the third person and says \"Owwf\", then the third person calls the first person and says \"Owf\", so the first person becomes Joon-Joon of the round. So the condition is satisfied if x is 1.The process is similar for the second and the third person.If the fourth person starts some round:The fourth person calls himself and says \"Owwwf\", then he calls himself again and says \"Owwf\", then he calls himself for another time and says \"Owf\", so the fourth person becomes Joon-Joon of the round. So the condition is satisfied when x is 4.In the last example if the first person starts a round, then the second person becomes the Joon-Joon, and vice versa."}, "src_uid": "149221131a978298ac56b58438df46c9"}
{"nl": {"description": "Okabe needs bananas for one of his experiments for some strange reason. So he decides to go to the forest and cut banana trees.Consider the point (x,\u2009y) in the 2D plane such that x and y are integers and 0\u2009\u2264\u2009x,\u2009y. There is a tree in such a point, and it has x\u2009+\u2009y bananas. There are no trees nor bananas in other points. Now, Okabe draws a line with equation . Okabe can select a single rectangle with axis aligned sides with all points on or under the line and cut all the trees in all points that are inside or on the border of this rectangle and take their bananas. Okabe's rectangle can be degenerate; that is, it can be a line segment or even a point.Help Okabe and find the maximum number of bananas he can get if he chooses the rectangle wisely.Okabe is sure that the answer does not exceed 1018. You can trust him.", "input_spec": "The first line of input contains two space-separated integers m and b (1\u2009\u2264\u2009m\u2009\u2264\u20091000, 1\u2009\u2264\u2009b\u2009\u2264\u200910000).", "output_spec": "Print the maximum number of bananas Okabe can get from the trees he cuts.", "sample_inputs": ["1 5", "2 3"], "sample_outputs": ["30", "25"], "notes": "Note  The graph above corresponds to sample test 1. The optimal rectangle is shown in red and has 30 bananas."}, "src_uid": "9300f1c07dd36e0cf7e6cb7911df4cf2"}
{"nl": {"description": "Reca company makes monitors, the most popular of their models is AB999 with the screen size a\u2009\u00d7\u2009b centimeters. Because of some production peculiarities a screen parameters are integer numbers. Recently the screen sides ratio x:\u2009y became popular with users. That's why the company wants to reduce monitor AB999 size so that its screen sides ratio becomes x:\u2009y, at the same time they want its total area to be maximal of all possible variants. Your task is to find the screen parameters of the reduced size model, or find out that such a reduction can't be performed.", "input_spec": "The first line of the input contains 4 integers \u2014 a, b, x and y (1\u2009\u2264\u2009a,\u2009b,\u2009x,\u2009y\u2009\u2264\u20092\u00b7109).", "output_spec": "If the answer exists, output 2 positive integers \u2014 screen parameters of the reduced size model. Output 0 0 otherwise.", "sample_inputs": ["800 600 4 3", "1920 1200 16 9", "1 1 1 2"], "sample_outputs": ["800 600", "1920 1080", "0 0"], "notes": null}, "src_uid": "97999cd7c6de79a4e39f56a41ff59e7a"}
{"nl": {"description": "So nearly half of the winter is over and Maria is dreaming about summer. She's fed up with skates and sleds, she was dreaming about Hopscotch all night long. It's a very popular children's game. The game field, the court, looks as is shown in the figure (all blocks are square and are numbered from bottom to top, blocks in the same row are numbered from left to right). Let us describe the hopscotch with numbers that denote the number of squares in the row, staring from the lowest one: 1-1-2-1-2-1-2-(1-2)..., where then the period is repeated (1-2).  The coordinate system is defined as shown in the figure. Side of all the squares are equal and have length a.Maria is a very smart and clever girl, and she is concerned with quite serious issues: if she throws a stone into a point with coordinates (x,\u2009y), then will she hit some square? If the answer is positive, you are also required to determine the number of the square.It is believed that the stone has fallen into the square if it is located strictly inside it. In other words a stone that has fallen on the square border is not considered a to hit a square.", "input_spec": "The only input line contains three integers: a, x, y, where a (1\u2009\u2264\u2009a\u2009\u2264\u2009100) is the side of the square, x and y (\u2009-\u2009106\u2009\u2264\u2009x\u2009\u2264\u2009106,\u20090\u2009\u2264\u2009y\u2009\u2264\u2009106) are coordinates of the stone.", "output_spec": "Print the number of the square, inside which the stone fell. If the stone is on a border of some stone or outside the court, print \"-1\" without the quotes.", "sample_inputs": ["1 0 0", "3 1 1", "3 0 10", "3 0 7", "3 4 0"], "sample_outputs": ["-1", "1", "5", "-1", "-1"], "notes": null}, "src_uid": "cf48ff6ba3e77ba5d4afccb8f775fb02"}
{"nl": {"description": "Recently Luba learned about a special kind of numbers that she calls beautiful numbers. The number is called beautiful iff its binary representation consists of k\u2009+\u20091 consecutive ones, and then k consecutive zeroes.Some examples of beautiful numbers:   12 (110);  1102 (610);  11110002 (12010);  1111100002 (49610). More formally, the number is beautiful iff there exists some positive integer k such that the number is equal to (2k\u2009-\u20091)\u2009*\u2009(2k\u2009-\u20091).Luba has got an integer number n, and she wants to find its greatest beautiful divisor. Help her to find it!", "input_spec": "The only line of input contains one number n (1\u2009\u2264\u2009n\u2009\u2264\u2009105) \u2014 the number Luba has got.", "output_spec": "Output one number \u2014 the greatest beautiful divisor of Luba's number. It is obvious that the answer always exists.", "sample_inputs": ["3", "992"], "sample_outputs": ["1", "496"], "notes": null}, "src_uid": "339246a1be81aefe19290de0d1aead84"}
{"nl": {"description": "Sagheer is walking in the street when he comes to an intersection of two roads. Each road can be represented as two parts where each part has 3 lanes getting into the intersection (one for each direction) and 3 lanes getting out of the intersection, so we have 4 parts in total. Each part has 4 lights, one for each lane getting into the intersection (l \u2014 left, s \u2014 straight, r \u2014 right) and a light p for a pedestrian crossing.   An accident is possible if a car can hit a pedestrian. This can happen if the light of a pedestrian crossing of some part and the light of a lane that can get to or from that same part are green at the same time.Now, Sagheer is monitoring the configuration of the traffic lights. Your task is to help him detect whether an accident is possible.", "input_spec": "The input consists of four lines with each line describing a road part given in a counter-clockwise order. Each line contains four integers l, s, r, p \u2014 for the left, straight, right and pedestrian lights, respectively. The possible values are 0 for red light and 1 for green light.", "output_spec": "On a single line, print \"YES\" if an accident is possible, and \"NO\" otherwise.", "sample_inputs": ["1 0 0 1\n0 1 0 0\n0 0 1 0\n0 0 0 1", "0 1 1 0\n1 0 1 0\n1 1 0 0\n0 0 0 1", "1 0 0 0\n0 0 0 1\n0 0 0 0\n1 0 1 0"], "sample_outputs": ["YES", "NO", "NO"], "notes": "NoteIn the first example, some accidents are possible because cars of part 1 can hit pedestrians of parts 1 and 4. Also, cars of parts 2 and 3 can hit pedestrians of part 4.In the second example, no car can pass the pedestrian crossing of part 4 which is the only green pedestrian light. So, no accident can occur."}, "src_uid": "44fdf71d56bef949ec83f00d17c29127"}
{"nl": {"description": "You have $$$n \\times n$$$ square grid and an integer $$$k$$$. Put an integer in each cell while satisfying the conditions below.  All numbers in the grid should be between $$$1$$$ and $$$k$$$ inclusive.  Minimum number of the $$$i$$$-th row is $$$1$$$ ($$$1 \\le i \\le n$$$).  Minimum number of the $$$j$$$-th column is $$$1$$$ ($$$1 \\le j \\le n$$$). Find the number of ways to put integers in the grid. Since the answer can be very large, find the answer modulo $$$(10^{9} + 7)$$$.  These are the examples of valid and invalid grid when $$$n=k=2$$$. ", "input_spec": "The only line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 250$$$, $$$1 \\le k \\le 10^{9}$$$).", "output_spec": "Print the answer modulo $$$(10^{9} + 7)$$$.", "sample_inputs": ["2 2", "123 456789"], "sample_outputs": ["7", "689974806"], "notes": "NoteIn the first example, following $$$7$$$ cases are possible.  In the second example, make sure you print the answer modulo $$$(10^{9} + 7)$$$."}, "src_uid": "f67173c973c6f83e88bc0ddb0b9bfa93"}
{"nl": {"description": "Olesya loves numbers consisting of n digits, and Rodion only likes numbers that are divisible by t. Find some number that satisfies both of them.Your task is: given the n and t print an integer strictly larger than zero consisting of n digits that is divisible by t. If such number doesn't exist, print \u2009-\u20091.", "input_spec": "The single line contains two numbers, n and t (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 2\u2009\u2264\u2009t\u2009\u2264\u200910) \u2014 the length of the number and the number it should be divisible by.", "output_spec": "Print one such positive number without leading zeroes, \u2014 the answer to the problem, or \u2009-\u20091, if such number doesn't exist. If there are multiple possible answers, you are allowed to print any of them.", "sample_inputs": ["3 2"], "sample_outputs": ["712"], "notes": null}, "src_uid": "77ffc1e38c32087f98ab5b3cb11cd2ed"}
{"nl": {"description": "Little Petya loves presents. His mum bought him two strings of the same size for his birthday. The strings consist of uppercase and lowercase Latin letters. Now Petya wants to compare those two strings lexicographically. The letters' case does not matter, that is an uppercase letter is considered equivalent to the corresponding lowercase letter. Help Petya perform the comparison.", "input_spec": "Each of the first two lines contains a bought string. The strings' lengths range from 1 to 100 inclusive. It is guaranteed that the strings are of the same length and also consist of uppercase and lowercase Latin letters.", "output_spec": "If the first string is less than the second one, print \"-1\". If the second string is less than the first one, print \"1\". If the strings are equal, print \"0\". Note that the letters' case is not taken into consideration when the strings are compared.", "sample_inputs": ["aaaa\naaaA", "abs\nAbz", "abcdefg\nAbCdEfF"], "sample_outputs": ["0", "-1", "1"], "notes": "NoteIf you want more formal information about the lexicographical order (also known as the \"dictionary order\" or \"alphabetical order\"), you can visit the following site: http://en.wikipedia.org/wiki/Lexicographical_order"}, "src_uid": "ffeae332696a901813677bd1033cf01e"}
{"nl": {"description": "The campus has $$$m$$$ rooms numbered from $$$0$$$ to $$$m - 1$$$. Also the $$$x$$$-mouse lives in the campus. The $$$x$$$-mouse is not just a mouse: each second $$$x$$$-mouse moves from room $$$i$$$ to the room $$$i \\cdot x \\mod{m}$$$ (in fact, it teleports from one room to another since it doesn't visit any intermediate room). Starting position of the $$$x$$$-mouse is unknown.You are responsible to catch the $$$x$$$-mouse in the campus, so you are guessing about minimum possible number of traps (one trap in one room) you need to place. You are sure that if the $$$x$$$-mouse enters a trapped room, it immediately gets caught.And the only observation you made is $$$\\text{GCD} (x, m) = 1$$$.", "input_spec": "The only line contains two integers $$$m$$$ and $$$x$$$ ($$$2 \\le m \\le 10^{14}$$$, $$$1 \\le x < m$$$, $$$\\text{GCD} (x, m) = 1$$$) \u2014 the number of rooms and the parameter of $$$x$$$-mouse. ", "output_spec": "Print the only integer \u2014 minimum number of traps you need to install to catch the $$$x$$$-mouse.", "sample_inputs": ["4 3", "5 2"], "sample_outputs": ["3", "2"], "notes": "NoteIn the first example you can, for example, put traps in rooms $$$0$$$, $$$2$$$, $$$3$$$. If the $$$x$$$-mouse starts in one of this rooms it will be caught immediately. If $$$x$$$-mouse starts in the $$$1$$$-st rooms then it will move to the room $$$3$$$, where it will be caught.In the second example you can put one trap in room $$$0$$$ and one trap in any other room since $$$x$$$-mouse will visit all rooms $$$1..m-1$$$ if it will start in any of these rooms."}, "src_uid": "c2dd6de750812d6213c770b3587d8fcb"}
{"nl": {"description": "Someday, Drazil wanted to go on date with Varda. Drazil and Varda live on Cartesian plane. Drazil's home is located in point (0,\u20090) and Varda's home is located in point (a,\u2009b). In each step, he can move in a unit distance in horizontal or vertical direction. In other words, from position (x,\u2009y) he can go to positions (x\u2009+\u20091,\u2009y), (x\u2009-\u20091,\u2009y), (x,\u2009y\u2009+\u20091) or (x,\u2009y\u2009-\u20091). Unfortunately, Drazil doesn't have sense of direction. So he randomly chooses the direction he will go to in each step. He may accidentally return back to his house during his travel. Drazil may even not notice that he has arrived to (a,\u2009b) and continue travelling. Luckily, Drazil arrived to the position (a,\u2009b) successfully. Drazil said to Varda: \"It took me exactly s steps to travel from my house to yours\". But Varda is confused about his words, she is not sure that it is possible to get from (0,\u20090) to (a,\u2009b) in exactly s steps. Can you find out if it is possible for Varda?", "input_spec": "You are given three integers a, b, and s (\u2009-\u2009109\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109, 1\u2009\u2264\u2009s\u2009\u2264\u20092\u00b7109) in a single line.", "output_spec": "If you think Drazil made a mistake and it is impossible to take exactly s steps and get from his home to Varda's home, print \"No\" (without quotes). Otherwise, print \"Yes\".", "sample_inputs": ["5 5 11", "10 15 25", "0 5 1", "0 0 2"], "sample_outputs": ["No", "Yes", "No", "Yes"], "notes": "NoteIn fourth sample case one possible route is: ."}, "src_uid": "9a955ce0775018ff4e5825700c13ed36"}
{"nl": {"description": "You are given a string $$$s$$$ of length $$$n$$$ consisting of lowercase Latin letters. You may apply some operations to this string: in one operation you can delete some contiguous substring of this string, if all letters in the substring you delete are equal. For example, after deleting substring bbbb from string abbbbaccdd we get the string aaccdd.Calculate the minimum number of operations to delete the whole string $$$s$$$.", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\le n \\le 500$$$) \u2014 the length of string $$$s$$$. The second line contains the string $$$s$$$ ($$$|s| = n$$$) consisting of lowercase Latin letters.", "output_spec": "Output a single integer \u2014 the minimal number of operation to delete string $$$s$$$.", "sample_inputs": ["5\nabaca", "8\nabcddcba"], "sample_outputs": ["3", "4"], "notes": null}, "src_uid": "516a89f4d1ae867fc1151becd92471e6"}
{"nl": {"description": "Zane the wizard had never loved anyone before, until he fell in love with a girl, whose name remains unknown to us.  The girl lives in house m of a village. There are n houses in that village, lining in a straight line from left to right: house 1, house 2, ..., house n. The village is also well-structured: house i and house i\u2009+\u20091 (1\u2009\u2264\u2009i\u2009<\u2009n) are exactly 10 meters away. In this village, some houses are occupied, and some are not. Indeed, unoccupied houses can be purchased.You will be given n integers a1,\u2009a2,\u2009...,\u2009an that denote the availability and the prices of the houses. If house i is occupied, and therefore cannot be bought, then ai equals 0. Otherwise, house i can be bought, and ai represents the money required to buy it, in dollars.As Zane has only k dollars to spare, it becomes a challenge for him to choose the house to purchase, so that he could live as near as possible to his crush. Help Zane determine the minimum distance from his crush's house to some house he can afford, to help him succeed in his love.", "input_spec": "The first line contains three integers n, m, and k (2\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009m\u2009\u2264\u2009n, 1\u2009\u2264\u2009k\u2009\u2264\u2009100)\u00a0\u2014 the number of houses in the village, the house where the girl lives, and the amount of money Zane has (in dollars), respectively. The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (0\u2009\u2264\u2009ai\u2009\u2264\u2009100)\u00a0\u2014 denoting the availability and the prices of the houses. It is guaranteed that am\u2009=\u20090 and that it is possible to purchase some house with no more than k dollars.", "output_spec": "Print one integer\u00a0\u2014 the minimum distance, in meters, from the house where the girl Zane likes lives to the house Zane can buy.", "sample_inputs": ["5 1 20\n0 27 32 21 19", "7 3 50\n62 0 0 0 99 33 22", "10 5 100\n1 0 1 0 0 0 0 0 1 1"], "sample_outputs": ["40", "30", "20"], "notes": "NoteIn the first sample, with k\u2009=\u200920 dollars, Zane can buy only house 5. The distance from house m\u2009=\u20091 to house 5 is 10\u2009+\u200910\u2009+\u200910\u2009+\u200910\u2009=\u200940 meters.In the second sample, Zane can buy houses 6 and 7. It is better to buy house 6 than house 7, since house m\u2009=\u20093 and house 6 are only 30 meters away, while house m\u2009=\u20093 and house 7 are 40 meters away."}, "src_uid": "57860e9a5342a29257ce506063d37624"}
{"nl": {"description": "The Bubble Cup hypothesis stood unsolved for $$$130$$$ years. Who ever proves the hypothesis will be regarded as one of the greatest mathematicians of our time! A famous mathematician Jerry Mao managed to reduce the hypothesis to this problem:Given a number $$$m$$$, how many polynomials $$$P$$$ with coefficients in set $$${\\{0,1,2,3,4,5,6,7\\}}$$$ have: $$$P(2)=m$$$?Help Jerry Mao solve the long standing problem!", "input_spec": "The first line contains a single integer $$$t$$$ $$$(1 \\leq t \\leq 5\\cdot 10^5)$$$ - number of test cases. On next line there are $$$t$$$ numbers, $$$m_i$$$ $$$(1 \\leq m_i \\leq 10^{18})$$$ - meaning that in case $$$i$$$ you should solve for number $$$m_i$$$.", "output_spec": "For each test case $$$i$$$, print the answer on separate lines: number of polynomials $$$P$$$ as described in statement such that $$$P(2)=m_i$$$, modulo $$$10^9 + 7$$$.", "sample_inputs": ["2\n2 4"], "sample_outputs": ["2\n4"], "notes": "NoteIn first case, for $$$m=2$$$, polynomials that satisfy the constraint are $$$x$$$ and $$$2$$$.In second case, for $$$m=4$$$, polynomials that satisfy the constraint are $$$x^2$$$, $$$x + 2$$$, $$$2x$$$ and $$$4$$$."}, "src_uid": "24f4bd10ae714f957920afd47ac0c558"}
{"nl": {"description": "To celebrate the opening of the Winter Computer School the organizers decided to buy in n liters of cola. However, an unexpected difficulty occurred in the shop: it turned out that cola is sold in bottles 0.5, 1 and 2 liters in volume. At that, there are exactly a bottles 0.5 in volume, b one-liter bottles and c of two-liter ones. The organizers have enough money to buy any amount of cola. What did cause the heated arguments was how many bottles of every kind to buy, as this question is pivotal for the distribution of cola among the participants (and organizers as well).Thus, while the organizers are having the argument, discussing different variants of buying cola, the Winter School can't start. Your task is to count the number of all the possible ways to buy exactly n liters of cola and persuade the organizers that this number is too large, and if they keep on arguing, then the Winter Computer School will have to be organized in summer.All the bottles of cola are considered indistinguishable, i.e. two variants of buying are different from each other only if they differ in the number of bottles of at least one kind.", "input_spec": "The first line contains four integers \u2014 n, a, b, c (1\u2009\u2264\u2009n\u2009\u2264\u200910000, 0\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u20095000).", "output_spec": "Print the unique number \u2014 the solution to the problem. If it is impossible to buy exactly n liters of cola, print 0. ", "sample_inputs": ["10 5 5 5", "3 0 0 2"], "sample_outputs": ["9", "0"], "notes": null}, "src_uid": "474e527d41040446a18186596e8bdd83"}
{"nl": {"description": "The whole world got obsessed with robots,and to keep pace with the progress, great Berland's programmer Draude decided to build his own robot. He was working hard at the robot. He taught it to walk the shortest path from one point to another, to record all its movements, but like in many Draude's programs, there was a bug \u2014 the robot didn't always walk the shortest path. Fortunately, the robot recorded its own movements correctly. Now Draude wants to find out when his robot functions wrong. Heh, if Draude only remembered the map of the field, where he tested the robot, he would easily say if the robot walked in the right direction or not. But the field map was lost never to be found, that's why he asks you to find out if there exist at least one map, where the path recorded by the robot is the shortest.The map is an infinite checkered field, where each square is either empty, or contains an obstruction. It is also known that the robot never tries to run into the obstruction. By the recorded robot's movements find out if there exist at least one such map, that it is possible to choose for the robot a starting square (the starting square should be empty) such that when the robot moves from this square its movements coincide with the recorded ones (the robot doesn't run into anything, moving along empty squares only), and the path from the starting square to the end one is the shortest.In one movement the robot can move into the square (providing there are no obstrutions in this square) that has common sides with the square the robot is currently in.", "input_spec": "The first line of the input file contains the recording of the robot's movements. This recording is a non-empty string, consisting of uppercase Latin letters L, R, U and D, standing for movements left, right, up and down respectively. The length of the string does not exceed 100.", "output_spec": "In the first line output the only word OK (if the above described map exists), or BUG (if such a map does not exist).", "sample_inputs": ["LLUUUR", "RRUULLDD"], "sample_outputs": ["OK", "BUG"], "notes": null}, "src_uid": "bb7805cc9d1cc907b64371b209c564b3"}
{"nl": {"description": "Petya loves football very much. One day, as he was watching a football match, he was writing the players' current positions on a piece of paper. To simplify the situation he depicted it as a string consisting of zeroes and ones. A zero corresponds to players of one team; a one corresponds to players of another team. If there are at least 7 players of some team standing one after another, then the situation is considered dangerous. For example, the situation 00100110111111101 is dangerous and 11110111011101 is not. You are given the current situation. Determine whether it is dangerous or not.", "input_spec": "The first input line contains a non-empty string consisting of characters \"0\" and \"1\", which represents players. The length of the string does not exceed 100 characters. There's at least one player from each team present on the field.", "output_spec": "Print \"YES\" if the situation is dangerous. Otherwise, print \"NO\".", "sample_inputs": ["001001", "1000000001"], "sample_outputs": ["NO", "YES"], "notes": null}, "src_uid": "ed9a763362abc6ed40356731f1036b38"}
{"nl": {"description": "Two-gram is an ordered pair (i.e. string of length two) of capital Latin letters. For example, \"AZ\", \"AA\", \"ZA\" \u2014 three distinct two-grams.You are given a string $$$s$$$ consisting of $$$n$$$ capital Latin letters. Your task is to find any two-gram contained in the given string as a substring (i.e. two consecutive characters of the string) maximal number of times. For example, for string $$$s$$$ = \"BBAABBBA\" the answer is two-gram \"BB\", which contained in $$$s$$$ three times. In other words, find any most frequent two-gram.Note that occurrences of the two-gram can overlap with each other.", "input_spec": "The first line of the input contains integer number $$$n$$$ ($$$2 \\le n \\le 100$$$) \u2014 the length of string $$$s$$$. The second line of the input contains the string $$$s$$$ consisting of $$$n$$$ capital Latin letters.", "output_spec": "Print the only line containing exactly two capital Latin letters \u2014 any two-gram contained in the given string $$$s$$$ as a substring (i.e. two consecutive characters of the string) maximal number of times.", "sample_inputs": ["7\nABACABA", "5\nZZZAA"], "sample_outputs": ["AB", "ZZ"], "notes": "NoteIn the first example \"BA\" is also valid answer.In the second example the only two-gram \"ZZ\" can be printed because it contained in the string \"ZZZAA\" two times."}, "src_uid": "e78005d4be93dbaa518f3b40cca84ab1"}
{"nl": {"description": "Maxim wants to buy an apartment in a new house at Line Avenue of Metropolis. The house has n apartments that are numbered from 1 to n and are arranged in a row. Two apartments are adjacent if their indices differ by 1. Some of the apartments can already be inhabited, others are available for sale.Maxim often visits his neighbors, so apartment is good for him if it is available for sale and there is at least one already inhabited apartment adjacent to it. Maxim knows that there are exactly k already inhabited apartments, but he doesn't know their indices yet.Find out what could be the minimum possible and the maximum possible number of apartments that are good for Maxim.", "input_spec": "The only line of the input contains two integers: n and k (1\u2009\u2264\u2009n\u2009\u2264\u2009109, 0\u2009\u2264\u2009k\u2009\u2264\u2009n).", "output_spec": "Print the minimum possible and the maximum possible number of apartments good for Maxim.", "sample_inputs": ["6 3"], "sample_outputs": ["1 3"], "notes": "NoteIn the sample test, the number of good apartments could be minimum possible if, for example, apartments with indices 1, 2 and 3 were inhabited. In this case only apartment 4 is good. The maximum possible number could be, for example, if apartments with indices 1, 3 and 5 were inhabited. In this case all other apartments: 2, 4 and 6 are good."}, "src_uid": "bdccf34b5a5ae13238c89a60814b9f86"}
{"nl": {"description": "Ayrat is looking for the perfect code. He decided to start his search from an infinite field tiled by hexagons. For convenience the coordinate system is introduced, take a look at the picture to see how the coordinates of hexagon are defined:   Ayrat is searching through the field. He started at point (0,\u20090) and is moving along the spiral (see second picture). Sometimes he forgets where he is now. Help Ayrat determine his location after n moves.", "input_spec": "The only line of the input contains integer n (0\u2009\u2264\u2009n\u2009\u2264\u20091018)\u00a0\u2014 the number of Ayrat's moves.", "output_spec": "Print two integers x and y\u00a0\u2014 current coordinates of Ayrat coordinates.", "sample_inputs": ["3", "7"], "sample_outputs": ["-2 0", "3 2"], "notes": null}, "src_uid": "a4b6a570f5e63462b68447713924b465"}
{"nl": {"description": "The Rebel fleet is afraid that the Empire might want to strike back again. Princess Heidi needs to know if it is possible to assign R Rebel spaceships to guard B bases so that every base has exactly one guardian and each spaceship has exactly one assigned base (in other words, the assignment is a perfect matching). Since she knows how reckless her pilots are, she wants to be sure that any two (straight) paths \u2013 from a base to its assigned spaceship \u2013 do not intersect in the galaxy plane (that is, in 2D), and so there is no risk of collision.", "input_spec": "The first line contains two space-separated integers R,\u2009B(1\u2009\u2264\u2009R,\u2009B\u2009\u2264\u200910). For 1\u2009\u2264\u2009i\u2009\u2264\u2009R, the i\u2009+\u20091-th line contains two space-separated integers xi and yi (|xi|,\u2009|yi|\u2009\u2264\u200910000) denoting the coordinates of the i-th Rebel spaceship. The following B lines have the same format, denoting the position of bases. It is guaranteed that no two points coincide and that no three points are on the same line.", "output_spec": "If it is possible to connect Rebel spaceships and bases so as satisfy the constraint, output Yes, otherwise output No (without quote).", "sample_inputs": ["3 3\n0 0\n2 0\n3 1\n-2 1\n0 3\n2 2", "2 1\n1 0\n2 2\n3 1"], "sample_outputs": ["Yes", "No"], "notes": "NoteFor the first example, one possible way is to connect the Rebels and bases in order.For the second example, there is no perfect matching between Rebels and bases."}, "src_uid": "65f81f621c228c09915adcb05256c634"}
{"nl": {"description": "Girl Lena likes it when everything is in order, and looks for order everywhere. Once she was getting ready for the University and noticed that the room was in a mess \u2014 all the objects from her handbag were thrown about the room. Of course, she wanted to put them back into her handbag. The problem is that the girl cannot carry more than two objects at a time, and cannot move the handbag. Also, if he has taken an object, she cannot put it anywhere except her handbag \u2014 her inherent sense of order does not let her do so.You are given the coordinates of the handbag and the coordinates of the objects in some \u0421artesian coordinate system. It is known that the girl covers the distance between any two objects in the time equal to the squared length of the segment between the points of the objects. It is also known that initially the coordinates of the girl and the handbag are the same. You are asked to find such an order of actions, that the girl can put all the objects back into her handbag in a minimum time period.", "input_spec": "The first line of the input file contains the handbag's coordinates xs,\u2009ys. The second line contains number n (1\u2009\u2264\u2009n\u2009\u2264\u200924) \u2014 the amount of objects the girl has. The following n lines contain the objects' coordinates. All the coordinates do not exceed 100 in absolute value. All the given positions are different. All the numbers are integer.", "output_spec": "In the first line output the only number \u2014 the minimum time the girl needs to put the objects into her handbag.  In the second line output the possible optimum way for Lena. Each object in the input is described by its index number (from 1 to n), the handbag's point is described by number 0. The path should start and end in the handbag's point. If there are several optimal paths, print any of them. ", "sample_inputs": ["0 0\n2\n1 1\n-1 1", "1 1\n3\n4 3\n3 4\n0 0"], "sample_outputs": ["8\n0 1 2 0", "32\n0 1 2 0 3 0"], "notes": null}, "src_uid": "2ecbac20dc5f4060bc873553946281bc"}
{"nl": {"description": "There are three friend living on the straight line Ox in Lineland. The first friend lives at the point x1, the second friend lives at the point x2, and the third friend lives at the point x3. They plan to celebrate the New Year together, so they need to meet at one point. What is the minimum total distance they have to travel in order to meet at some point and celebrate the New Year?It's guaranteed that the optimal answer is always integer.", "input_spec": "The first line of the input contains three distinct integers x1, x2 and x3 (1\u2009\u2264\u2009x1,\u2009x2,\u2009x3\u2009\u2264\u2009100)\u00a0\u2014 the coordinates of the houses of the first, the second and the third friends respectively. ", "output_spec": "Print one integer\u00a0\u2014 the minimum total distance the friends need to travel in order to meet together.", "sample_inputs": ["7 1 4", "30 20 10"], "sample_outputs": ["6", "20"], "notes": "NoteIn the first sample, friends should meet at the point 4. Thus, the first friend has to travel the distance of 3 (from the point 7 to the point 4), the second friend also has to travel the distance of 3 (from the point 1 to the point 4), while the third friend should not go anywhere because he lives at the point 4."}, "src_uid": "7bffa6e8d2d21bbb3b7f4aec109b3319"}
{"nl": {"description": "Permutation p is an ordered set of integers p1,\u2009\u2009p2,\u2009\u2009...,\u2009\u2009pn, consisting of n distinct positive integers, each of them doesn't exceed n. We'll denote the i-th element of permutation p as pi. We'll call number n the size or the length of permutation p1,\u2009\u2009p2,\u2009\u2009...,\u2009\u2009pn.Petya decided to introduce the sum operation on the set of permutations of length n. Let's assume that we are given two permutations of length n: a1,\u2009a2,\u2009...,\u2009an and b1,\u2009b2,\u2009...,\u2009bn. Petya calls the sum of permutations a and b such permutation c of length n, where ci\u2009=\u2009((ai\u2009-\u20091\u2009+\u2009bi\u2009-\u20091) mod n)\u2009+\u20091 (1\u2009\u2264\u2009i\u2009\u2264\u2009n).Operation  means taking the remainder after dividing number x by number y.Obviously, not for all permutations a and b exists permutation c that is sum of a and b. That's why Petya got sad and asked you to do the following: given n, count the number of such pairs of permutations a and b of length n, that exists permutation c that is sum of a and b. The pair of permutations x,\u2009y (x\u2009\u2260\u2009y) and the pair of permutations y,\u2009x are considered distinct pairs.As the answer can be rather large, print the remainder after dividing it by 1000000007 (109\u2009+\u20097).", "input_spec": "The single line contains integer n (1\u2009\u2264\u2009n\u2009\u2264\u200916).", "output_spec": "In the single line print a single non-negative integer \u2014 the number of such pairs of permutations a and b, that exists permutation c that is sum of a and b, modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["3", "5"], "sample_outputs": ["18", "1800"], "notes": null}, "src_uid": "a6a804ce23bc48ec825c17d64ac0bb69"}
{"nl": {"description": "Cucumber boy is fan of Kyubeat, a famous music game.Kyubeat has 16 panels for playing arranged in 4\u2009\u00d7\u20094 table. When a panel lights up, he has to press that panel.Each panel has a timing to press (the preffered time when a player should press it), and Cucumber boy is able to press at most k panels in a time with his one hand. Cucumber boy is trying to press all panels in perfect timing, that is he wants to press each panel exactly in its preffered time. If he cannot press the panels with his two hands in perfect timing, his challenge to press all the panels in perfect timing will fail.You are given one scene of Kyubeat's panel from the music Cucumber boy is trying. Tell him is he able to press all the panels in perfect timing.", "input_spec": "The first line contains a single integer k (1\u2009\u2264\u2009k\u2009\u2264\u20095) \u2014 the number of panels Cucumber boy can press with his one hand. Next 4 lines contain 4 characters each (digits from 1 to 9, or period) \u2014 table of panels. If a digit i was written on the panel, it means the boy has to press that panel in time i. If period was written on the panel, he doesn't have to press that panel.", "output_spec": "Output \"YES\" (without quotes), if he is able to press all the panels in perfect timing. If not, output \"NO\" (without quotes).", "sample_inputs": ["1\n.135\n1247\n3468\n5789", "5\n..1.\n1111\n..1.\n..1.", "1\n....\n12.1\n.2..\n.2.."], "sample_outputs": ["YES", "YES", "NO"], "notes": "NoteIn the third sample boy cannot press all panels in perfect timing. He can press all the panels in timing in time 1, but he cannot press the panels in time 2 in timing with his two hands."}, "src_uid": "5fdaf8ee7763cb5815f49c0c38398f16"}
{"nl": {"description": "Two players play a game. The game is played on a rectangular board with n\u2009\u00d7\u2009m squares. At the beginning of the game two different squares of the board have two chips. The first player's goal is to shift the chips to the same square. The second player aims to stop the first one with a tube of superglue.We'll describe the rules of the game in more detail.The players move in turns. The first player begins.With every move the first player chooses one of his unglued chips, and shifts it one square to the left, to the right, up or down. It is not allowed to move a chip beyond the board edge. At the beginning of a turn some squares of the board may be covered with a glue. The first player can move the chip to such square, in this case the chip gets tightly glued and cannot move any longer.At each move the second player selects one of the free squares (which do not contain a chip or a glue) and covers it with superglue. The glue dries long and squares covered with it remain sticky up to the end of the game.If, after some move of the first player both chips are in the same square, then the first player wins. If the first player cannot make a move (both of his chips are glued), then the second player wins. Note that the situation where the second player cannot make a move is impossible \u2014 he can always spread the glue on the square from which the first player has just moved the chip.We will further clarify the case where both chips are glued and are in the same square. In this case the first player wins as the game ends as soon as both chips are in the same square, and the condition of the loss (the inability to move) does not arise.You know the board sizes and the positions of the two chips on it. At the beginning of the game all board squares are glue-free. Find out who wins if the players play optimally.", "input_spec": "The first line contains six integers n, m, x1, y1, x2, y2 \u2014 the board sizes and the coordinates of the first and second chips, correspondingly (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100; 2\u2009\u2264\u2009n\u2009\u00d7\u2009m; 1\u2009\u2264\u2009x1,\u2009x2\u2009\u2264\u2009n; 1\u2009\u2264\u2009y1,\u2009y2\u2009\u2264\u2009m). The numbers in the line are separated by single spaces. It is guaranteed that the chips are located in different squares.", "output_spec": "If the first player wins, print \"First\" without the quotes. Otherwise, print \"Second\" without the quotes.", "sample_inputs": ["1 6 1 2 1 6", "6 5 4 3 2 1", "10 10 1 1 10 10"], "sample_outputs": ["First", "First", "Second"], "notes": null}, "src_uid": "41f6f90b7307d2383495441114fa8ea2"}
{"nl": {"description": "From beginning till end, this message has been waiting to be conveyed.For a given unordered multiset of n lowercase English letters (\"multi\" means that a letter may appear more than once), we treat all letters as strings of length 1, and repeat the following operation n\u2009-\u20091 times:  Remove any two elements s and t from the set, and add their concatenation s\u2009+\u2009t to the set. The cost of such operation is defined to be , where f(s,\u2009c) denotes the number of times character c appears in string s.Given a non-negative integer k, construct any valid non-empty set of no more than 100\u2009000 letters, such that the minimum accumulative cost of the whole process is exactly k. It can be shown that a solution always exists.", "input_spec": "The first and only line of input contains a non-negative integer k (0\u2009\u2264\u2009k\u2009\u2264\u2009100\u2009000) \u2014 the required minimum cost.", "output_spec": "Output a non-empty string of no more than 100\u2009000 lowercase English letters \u2014 any multiset satisfying the requirements, concatenated to be a string. Note that the printed string doesn't need to be the final concatenated string. It only needs to represent an unordered multiset of letters.", "sample_inputs": ["12", "3"], "sample_outputs": ["abababab", "codeforces"], "notes": "NoteFor the multiset {'a', 'b', 'a', 'b', 'a', 'b', 'a', 'b'}, one of the ways to complete the process is as follows:  {\"ab\", \"a\", \"b\", \"a\", \"b\", \"a\", \"b\"}, with a cost of 0;  {\"aba\", \"b\", \"a\", \"b\", \"a\", \"b\"}, with a cost of 1;  {\"abab\", \"a\", \"b\", \"a\", \"b\"}, with a cost of 1;  {\"abab\", \"ab\", \"a\", \"b\"}, with a cost of 0;  {\"abab\", \"aba\", \"b\"}, with a cost of 1;  {\"abab\", \"abab\"}, with a cost of 1;  {\"abababab\"}, with a cost of 8. The total cost is 12, and it can be proved to be the minimum cost of the process."}, "src_uid": "b991c064562704b6106a6ff2a297e64a"}
{"nl": {"description": "A sweet little monster Om Nom loves candies very much. One day he found himself in a rather tricky situation that required him to think a bit in order to enjoy candies the most. Would you succeed with the same task if you were on his place?  One day, when he came to his friend Evan, Om Nom didn't find him at home but he found two bags with candies. The first was full of blue candies and the second bag was full of red candies. Om Nom knows that each red candy weighs Wr grams and each blue candy weighs Wb grams. Eating a single red candy gives Om Nom Hr joy units and eating a single blue candy gives Om Nom Hb joy units.Candies are the most important thing in the world, but on the other hand overeating is not good. Om Nom knows if he eats more than C grams of candies, he will get sick. Om Nom thinks that it isn't proper to leave candy leftovers, so he can only eat a whole candy. Om Nom is a great mathematician and he quickly determined how many candies of what type he should eat in order to get the maximum number of joy units. Can you repeat his achievement? You can assume that each bag contains more candies that Om Nom can eat.", "input_spec": "The single line contains five integers C,\u2009Hr,\u2009Hb,\u2009Wr,\u2009Wb (1\u2009\u2264\u2009C,\u2009Hr,\u2009Hb,\u2009Wr,\u2009Wb\u2009\u2264\u2009109).", "output_spec": "Print a single integer \u2014 the maximum number of joy units that Om Nom can get.", "sample_inputs": ["10 3 5 2 3"], "sample_outputs": ["16"], "notes": "NoteIn the sample test Om Nom can eat two candies of each type and thus get 16 joy units."}, "src_uid": "eb052ca12ca293479992680581452399"}
{"nl": {"description": "You are a lover of bacteria. You want to raise some bacteria in a box. Initially, the box is empty. Each morning, you can put any number of bacteria into the box. And each night, every bacterium in the box will split into two bacteria. You hope to see exactly x bacteria in the box at some moment. What is the minimum number of bacteria you need to put into the box across those days?", "input_spec": "The only line containing one integer x (1\u2009\u2264\u2009x\u2009\u2264\u2009109).", "output_spec": "The only line containing one integer: the answer.", "sample_inputs": ["5", "8"], "sample_outputs": ["2", "1"], "notes": "NoteFor the first sample, we can add one bacterium in the box in the first day morning and at the third morning there will be 4 bacteria in the box. Now we put one more resulting 5 in the box. We added 2 bacteria in the process so the answer is 2.For the second sample, we can put one in the first morning and in the 4-th morning there will be 8 in the box. So the answer is 1."}, "src_uid": "03e4482d53a059134676f431be4c16d2"}
{"nl": {"description": "This is the easy version of the problem. The difference between the versions is in the constraints on the array elements. You can make hacks only if all versions of the problem are solved.You are given an array $$$[a_1, a_2, \\dots, a_n]$$$. Your goal is to find the length of the longest subarray of this array such that the most frequent value in it is not unique. In other words, you are looking for a subarray such that if the most frequent value occurs $$$f$$$ times in this subarray, then at least $$$2$$$ different values should occur exactly $$$f$$$ times.An array $$$c$$$ is a subarray of an array $$$d$$$ if $$$c$$$ can be obtained from $$$d$$$ by deletion of several (possibly, zero or all) elements from the beginning and several (possibly, zero or all) elements from the end.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 200\\,000$$$)\u00a0\u2014 the length of the array. The second line contains $$$n$$$ integers $$$a_1, a_2, \\ldots, a_n$$$ ($$$1 \\le a_i \\le min(n, 100)$$$)\u00a0\u2014 elements of the array.", "output_spec": "You should output exactly one integer \u00a0\u2014 the length of the longest subarray of the array whose most frequent value is not unique. If there is no such subarray, output $$$0$$$.", "sample_inputs": ["7\n1 1 2 2 3 3 3", "10\n1 1 1 5 4 1 3 1 2 2", "1\n1"], "sample_outputs": ["6", "7", "0"], "notes": "NoteIn the first sample, the subarray $$$[1, 1, 2, 2, 3, 3]$$$ is good, but $$$[1, 1, 2, 2, 3, 3, 3]$$$ isn't: in the latter there are $$$3$$$ occurrences of number $$$3$$$, and no other element appears $$$3$$$ times."}, "src_uid": "a06ebb2734365ec97d07cd1b6b3faeed"}
{"nl": {"description": "Pasha has a wooden stick of some positive integer length n. He wants to perform exactly three cuts to get four parts of the stick. Each part must have some positive integer length and the sum of these lengths will obviously be n. Pasha likes rectangles but hates squares, so he wonders, how many ways are there to split a stick into four parts so that it's possible to form a rectangle using these parts, but is impossible to form a square.Your task is to help Pasha and count the number of such ways. Two ways to cut the stick are considered distinct if there exists some integer x, such that the number of parts of length x in the first way differ from the number of parts of length x in the second way.", "input_spec": "The first line of the input contains a positive integer n (1\u2009\u2264\u2009n\u2009\u2264\u20092\u00b7109) \u2014 the length of Pasha's stick.", "output_spec": "The output should contain a single integer\u00a0\u2014 the number of ways to split Pasha's stick into four parts of positive integer length so that it's possible to make a rectangle by connecting the ends of these parts, but is impossible to form a square. ", "sample_inputs": ["6", "20"], "sample_outputs": ["1", "4"], "notes": "NoteThere is only one way to divide the stick in the first sample {1, 1, 2, 2}.Four ways to divide the stick in the second sample are {1, 1, 9, 9}, {2, 2, 8, 8}, {3, 3, 7, 7} and {4, 4, 6, 6}. Note that {5, 5, 5, 5} doesn't work."}, "src_uid": "32b59d23f71800bc29da74a3fe2e2b37"}
{"nl": {"description": "Being a nonconformist, Volodya is displeased with the current state of things, particularly with the order of natural numbers (natural number is positive integer number). He is determined to rearrange them. But there are too many natural numbers, so Volodya decided to start with the first n. He writes down the following sequence of numbers: firstly all odd integers from 1 to n (in ascending order), then all even integers from 1 to n (also in ascending order). Help our hero to find out which number will stand at the position number k.", "input_spec": "The only line of input contains integers n and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u20091012). Please, do not use the %lld specifier to read or write 64-bit integers in C++. It is preferred to use the cin, cout streams or the %I64d specifier.", "output_spec": "Print the number that will stand at the position number k after Volodya's manipulations.", "sample_inputs": ["10 3", "7 7"], "sample_outputs": ["5", "6"], "notes": "NoteIn the first sample Volodya's sequence will look like this: {1, 3, 5, 7, 9, 2, 4, 6, 8, 10}. The third place in the sequence is therefore occupied by the number 5."}, "src_uid": "1f8056884db00ad8294a7cc0be75fe97"}
{"nl": {"description": "You have a fraction . You need to find the first occurrence of digit c into decimal notation of the fraction after decimal point.", "input_spec": "The first contains three single positive integers a, b, c (1\u2009\u2264\u2009a\u2009<\u2009b\u2009\u2264\u2009105, 0\u2009\u2264\u2009c\u2009\u2264\u20099).", "output_spec": "Print position of the first occurrence of digit c into the fraction. Positions are numbered from 1 after decimal point. It there is no such position, print -1.", "sample_inputs": ["1 2 0", "2 3 7"], "sample_outputs": ["2", "-1"], "notes": "NoteThe fraction in the first example has the following decimal notation: . The first zero stands on second position.The fraction in the second example has the following decimal notation: . There is no digit 7 in decimal notation of the fraction. "}, "src_uid": "0bc7bf67b96e2898cfd8d129ad486910"}
{"nl": {"description": "Luba has a ticket consisting of 6 digits. In one move she can choose digit in any position and replace it with arbitrary digit. She wants to know the minimum number of digits she needs to replace in order to make the ticket lucky.The ticket is considered lucky if the sum of first three digits equals to the sum of last three digits.", "input_spec": "You are given a string consisting of 6 characters (all characters are digits from 0 to 9) \u2014 this string denotes Luba's ticket. The ticket can start with the digit 0.", "output_spec": "Print one number \u2014 the minimum possible number of digits Luba needs to replace to make the ticket lucky.", "sample_inputs": ["000000", "123456", "111000"], "sample_outputs": ["0", "2", "1"], "notes": "NoteIn the first example the ticket is already lucky, so the answer is 0.In the second example Luba can replace 4 and 5 with zeroes, and the ticket will become lucky. It's easy to see that at least two replacements are required.In the third example Luba can replace any zero with 3. It's easy to see that at least one replacement is required."}, "src_uid": "09601fd1742ffdc9f822950f1d3e8494"}
{"nl": {"description": "You are given two squares, one with sides parallel to the coordinate axes, and another one with sides at 45 degrees to the coordinate axes. Find whether the two squares intersect.The interior of the square is considered to be part of the square, i.e. if one square is completely inside another, they intersect. If the two squares only share one common point, they are also considered to intersect.", "input_spec": "The input data consists of two lines, one for each square, both containing 4 pairs of integers. Each pair represents coordinates of one vertex of the square. Coordinates within each line are either in clockwise or counterclockwise order. The first line contains the coordinates of the square with sides parallel to the coordinate axes, the second line contains the coordinates of the square at 45 degrees. All the values are integer and between $$$-100$$$ and $$$100$$$.", "output_spec": "Print \"Yes\" if squares intersect, otherwise print \"No\". You can print each letter in any case (upper or lower).", "sample_inputs": ["0 0 6 0 6 6 0 6\n1 3 3 5 5 3 3 1", "0 0 6 0 6 6 0 6\n7 3 9 5 11 3 9 1", "6 0 6 6 0 6 0 0\n7 4 4 7 7 10 10 7"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteIn the first example the second square lies entirely within the first square, so they do intersect.In the second sample squares do not have any points in common.Here are images corresponding to the samples:      "}, "src_uid": "f6a3dd8b3bab58ff66055c61ddfdf06a"}
{"nl": {"description": "You're given a string of lower-case Latin letters. Your task is to find the length of its longest substring that can be met in the string at least twice. These occurrences can overlap (see sample test 2).", "input_spec": "The first input line contains the string. It's guaranteed, that the string is non-empty, consists of lower-case Latin letters, and its length doesn't exceed 100.", "output_spec": "Output one number \u2014 length of the longest substring that can be met in the string at least twice.", "sample_inputs": ["abcd", "ababa", "zzz"], "sample_outputs": ["0", "3", "2"], "notes": null}, "src_uid": "13b5cf94f2fabd053375a5ccf3fd44c7"}
{"nl": {"description": "InputThe input contains a single integer a (1\u2009\u2264\u2009a\u2009\u2264\u200940).OutputOutput a single string.ExamplesInput2OutputAdamsInput8OutputVan BurenInput29OutputHarding", "input_spec": "The input contains a single integer a (1\u2009\u2264\u2009a\u2009\u2264\u200940).", "output_spec": "Output a single string.", "sample_inputs": ["2", "8", "29"], "sample_outputs": ["Adams", "Van Buren", "Harding"], "notes": null}, "src_uid": "0b51a8318c9ec0c80c0f4dc04fe0bfb3"}
{"nl": {"description": "Vasya has a pack of 54 cards (52 standard cards and 2 distinct jokers). That is all he has at the moment. Not to die from boredom, Vasya plays Solitaire with them.Vasya lays out nm cards as a rectangle n\u2009\u00d7\u2009m. If there are jokers among them, then Vasya should change them with some of the rest of 54\u2009-\u2009nm cards (which are not layed out) so that there were no jokers left. Vasya can pick the cards to replace the jokers arbitrarily. Remember, that each card presents in pack exactly once (i. e. in a single copy). Vasya tries to perform the replacements so that the solitaire was solved.Vasya thinks that the solitaire is solved if after the jokers are replaced, there exist two non-overlapping squares 3\u2009\u00d7\u20093, inside each of which all the cards either have the same suit, or pairwise different ranks.Determine by the initial position whether the solitaire can be solved or not. If it can be solved, show the way in which it is possible.", "input_spec": "The first line contains integers n and m (3\u2009\u2264\u2009n,\u2009m\u2009\u2264\u200917, n\u2009\u00d7\u2009m\u2009\u2264\u200952). Next n lines contain m words each. Each word consists of two letters. The jokers are defined as \"J1\" and \"J2\" correspondingly. For the rest of the cards, the first letter stands for the rank and the second one \u2014 for the suit. The possible ranks are: \"2\", \"3\", \"4\", \"5\", \"6\", \"7\", \"8\", \"9\", \"T\", \"J\", \"Q\", \"K\" and \"A\". The possible suits are: \"C\", \"D\", \"H\" and \"S\". All the cards are different.", "output_spec": "If the Solitaire can be solved, print on the first line \"Solution exists.\" without the quotes. On the second line print in what way the jokers can be replaced. Three variants are possible:   \"There are no jokers.\", if there are no jokers in the input data. \"Replace Jx with y.\", if there is one joker. x is its number, and y is the card it should be replaced with. \"Replace J1 with x and J2 with y.\", if both jokers are present in the input data. x and y here represent distinct cards with which one should replace the first and the second jokers correspondingly. On the third line print the coordinates of the upper left corner of the first square 3\u2009\u00d7\u20093 in the format \"Put the first square to (r, c).\", where r and c are the row and the column correspondingly. In the same manner print on the fourth line the coordinates of the second square 3\u2009\u00d7\u20093 in the format \"Put the second square to (r, c).\". If there are several solutions to that problem, print any of them. If there are no solutions, print of the single line \"No solution.\" without the quotes. See the samples to understand the output format better.", "sample_inputs": ["4 6\n2S 3S 4S 7S 8S AS\n5H 6H 7H 5S TC AC\n8H 9H TH 7C 8C 9C\n2D 2C 3C 4C 5C 6C", "4 6\n2S 3S 4S 7S 8S AS\n5H 6H 7H J1 TC AC\n8H 9H TH 7C 8C 9C\n2D 2C 3C 4C 5C 6C", "4 6\n2S 3S 4S 7S 8S AS\n5H 6H 7H QC TC AC\n8H 9H TH 7C 8C 9C\n2D 2C 3C 4C 5C 6C"], "sample_outputs": ["No solution.", "Solution exists.\nReplace J1 with 2H.\nPut the first square to (1, 1).\nPut the second square to (2, 4).", "Solution exists.\nThere are no jokers.\nPut the first square to (1, 1).\nPut the second square to (2, 4)."], "notes": "NoteThe pretests cover all the possible output formats."}, "src_uid": "b3f29d9c27cbfeadb96b6ac9ffd6bc8f"}
{"nl": {"description": "One spring day on his way to university Lesha found an array A. Lesha likes to split arrays into several parts. This time Lesha decided to split the array A into several, possibly one, new arrays so that the sum of elements in each of the new arrays is not zero. One more condition is that if we place the new arrays one after another they will form the old array A.Lesha is tired now so he asked you to split the array. Help Lesha!", "input_spec": "The first line contains single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100)\u00a0\u2014 the number of elements in the array A. The next line contains n integers a1,\u2009a2,\u2009...,\u2009an (\u2009-\u2009103\u2009\u2264\u2009ai\u2009\u2264\u2009103)\u00a0\u2014 the elements of the array A.", "output_spec": "If it is not possible to split the array A and satisfy all the constraints, print single line containing \"NO\" (without quotes). Otherwise in the first line print \"YES\" (without quotes). In the next line print single integer k\u00a0\u2014 the number of new arrays. In each of the next k lines print two integers li and ri which denote the subarray A[li... ri] of the initial array A being the i-th new array. Integers li, ri should satisfy the following conditions:   l1\u2009=\u20091  rk\u2009=\u2009n  ri\u2009+\u20091\u2009=\u2009li\u2009+\u20091 for each 1\u2009\u2264\u2009i\u2009<\u2009k.  If there are multiple answers, print any of them.", "sample_inputs": ["3\n1 2 -3", "8\n9 -12 3 4 -4 -10 7 3", "1\n0", "4\n1 2 3 -5"], "sample_outputs": ["YES\n2\n1 2\n3 3", "YES\n2\n1 2\n3 8", "NO", "YES\n4\n1 1\n2 2\n3 3\n4 4"], "notes": null}, "src_uid": "3a9258070ff179daf33a4515def9897a"}
{"nl": {"description": "A frog lives on the axis Ox and needs to reach home which is in the point n. She starts from the point 1. The frog can jump to the right at a distance not more than d. So, after she jumped from the point x she can reach the point x\u2009+\u2009a, where a is an integer from 1 to d.For each point from 1 to n is known if there is a lily flower in it. The frog can jump only in points with a lilies. Guaranteed that there are lilies in the points 1 and n.Determine the minimal number of jumps that the frog needs to reach home which is in the point n from the point 1. Consider that initially the frog is in the point 1. If the frog can not reach home, print -1.", "input_spec": "The first line contains two integers n and d (2\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009d\u2009\u2264\u2009n\u2009-\u20091) \u2014 the point, which the frog wants to reach, and the maximal length of the frog jump. The second line contains a string s of length n, consisting of zeros and ones. If a character of the string s equals to zero, then in the corresponding point there is no lily flower. In the other case, in the corresponding point there is a lily flower. Guaranteed that the first and the last characters of the string s equal to one.", "output_spec": "If the frog can not reach the home, print -1. In the other case, print the minimal number of jumps that the frog needs to reach the home which is in the point n from the point 1.", "sample_inputs": ["8 4\n10010101", "4 2\n1001", "8 4\n11100101", "12 3\n101111100101"], "sample_outputs": ["2", "-1", "3", "4"], "notes": "NoteIn the first example the from can reach home in two jumps: the first jump from the point 1 to the point 4 (the length of the jump is three), and the second jump from the point 4 to the point 8 (the length of the jump is four).In the second example the frog can not reach home, because to make it she need to jump on a distance three, but the maximum length of her jump equals to two."}, "src_uid": "c08d2ecdfc66cd07fbbd461b1f069c9e"}
{"nl": {"description": "Vasya plays The Elder Trolls IV: Oblivon. Oh, those creators of computer games! What they do not come up with! Absolutely unique monsters have been added to the The Elder Trolls IV: Oblivon. One of these monsters is Unkillable Slug. Why it is \"Unkillable\"? Firstly, because it can be killed with cutting weapon only, so lovers of two-handed amber hammers should find suitable knife themselves. Secondly, it is necessary to make so many cutting strokes to Unkillable Slug. Extremely many. Too many! Vasya has already promoted his character to 80-th level and in order to gain level 81 he was asked to kill Unkillable Slug. The monster has a very interesting shape. It looks like a rectangular parallelepiped with size x\u2009\u00d7\u2009y\u2009\u00d7\u2009z, consisting of undestructable cells 1\u2009\u00d7\u20091\u2009\u00d7\u20091. At one stroke Vasya can cut the Slug along an imaginary grid, i.e. cut with a plane parallel to one of the parallelepiped side. Monster dies when amount of parts it is divided reaches some critical value.All parts of monster do not fall after each cut, they remains exactly on its places. I. e. Vasya can cut several parts with one cut.Vasya wants to know what the maximum number of pieces he can cut the Unkillable Slug into striking him at most k times.Vasya's character uses absolutely thin sword with infinite length.", "input_spec": "The first line of input contains four integer numbers x,\u2009y,\u2009z,\u2009k (1\u2009\u2264\u2009x,\u2009y,\u2009z\u2009\u2264\u2009106,\u20090\u2009\u2264\u2009k\u2009\u2264\u2009109).", "output_spec": "Output the only number \u2014 the answer for the problem. Please, do not use %lld specificator to read or write 64-bit integers in C++. It is preffered to use cout (also you may use %I64d).", "sample_inputs": ["2 2 2 3", "2 2 2 1"], "sample_outputs": ["8", "2"], "notes": "NoteIn the first sample Vasya make 3 pairwise perpendicular cuts. He cuts monster on two parts with the first cut, then he divides each part on two with the second cut, and finally he divides each of the 4 parts on two."}, "src_uid": "8787c5d46d7247d93d806264a8957639"}
{"nl": {"description": "per nextum in unam tum XI conscribementis fac sic    vestibulo perlegementum da varo.    morde varo.    seqis cumula varum.cisper nextum in unam tum XI conscribementis fac sic    seqis decumulamenta da varo.    varum privamentum fodementum da aresulto.    varum tum III elevamentum tum V multiplicamentum da bresulto.    aresultum tum bresultum addementum da resulto.    si CD tum resultum non praestantiam fac sic        dictum sic f(%d) = %.2f cis tum varum tum resultum egresso describe.        novumversum egresso scribe.    cis    si CD tum resultum praestantiam fac sic        dictum sic f(%d) = MAGNA NIMIS! cis tum varum egresso describe.        novumversum egresso scribe.            ciscis", "input_spec": "The input consists of several integers, one per line. Each integer is between -50 and 50, inclusive.", "output_spec": "As described in the problem statement.", "sample_inputs": ["0\n1\n-2\n-3\n-4\n-5\n-6\n-7\n-8\n-9\n10"], "sample_outputs": ["f(10) = MAGNA NIMIS!\nf(-9) = -3642.00\nf(-8) = -2557.17\nf(-7) = -1712.35\nf(-6) = -1077.55\nf(-5) = -622.76\nf(-4) = -318.00\nf(-3) = -133.27\nf(-2) = -38.59\nf(1) = 6.00\nf(0) = 0.00"], "notes": null}, "src_uid": "30b3411c3c23d029ea1e9cf73e7d2f01"}
{"nl": {"description": "Today on Informatics class Nastya learned about GCD and LCM (see links below). Nastya is very intelligent, so she solved all the tasks momentarily and now suggests you to solve one of them as well.We define a pair of integers (a,\u2009b) good, if GCD(a,\u2009b)\u2009=\u2009x and LCM(a,\u2009b)\u2009=\u2009y, where GCD(a,\u2009b) denotes the greatest common divisor of a and b, and LCM(a,\u2009b) denotes the least common multiple of a and b.You are given two integers x and y. You are to find the number of good pairs of integers (a,\u2009b) such that l\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009r. Note that pairs (a,\u2009b) and (b,\u2009a) are considered different if a\u2009\u2260\u2009b.", "input_spec": "The only line contains four integers l,\u2009r,\u2009x,\u2009y (1\u2009\u2264\u2009l\u2009\u2264\u2009r\u2009\u2264\u2009109, 1\u2009\u2264\u2009x\u2009\u2264\u2009y\u2009\u2264\u2009109).", "output_spec": "In the only line print the only integer\u00a0\u2014 the answer for the problem.", "sample_inputs": ["1 2 1 2", "1 12 1 12", "50 100 3 30"], "sample_outputs": ["2", "4", "0"], "notes": "NoteIn the first example there are two suitable good pairs of integers (a,\u2009b): (1,\u20092) and (2,\u20091).In the second example there are four suitable good pairs of integers (a,\u2009b): (1,\u200912), (12,\u20091), (3,\u20094) and (4,\u20093).In the third example there are good pairs of integers, for example, (3,\u200930), but none of them fits the condition l\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009r."}, "src_uid": "d37dde5841116352c9b37538631d0b15"}
{"nl": {"description": "This problem is split into two tasks. In this task, you are required to find the minimum possible answer. In the task Village (Maximum) you are required to find the maximum possible answer. Each task is worth $$$50$$$ points.There are $$$N$$$ houses in a certain village. A single villager lives in each of the houses. The houses are connected by roads. Each road connects two houses and is exactly $$$1$$$ kilometer long. From each house it is possible to reach any other using one or several consecutive roads. In total there are $$$N-1$$$ roads in the village.One day all villagers decided to move to different houses \u2014 that is, after moving each house should again have a single villager living in it, but no villager should be living in the same house as before. We would like to know the smallest possible total length in kilometers of the shortest paths between the old and the new houses for all villagers. Example village with seven houses For example, if there are seven houses connected by roads as shown on the figure, the smallest total length is $$$8$$$ km (this can be achieved by moving $$$1 \\to 6$$$, $$$2 \\to 4$$$, $$$3 \\to 1$$$, $$$4 \\to 2$$$, $$$5 \\to 7$$$, $$$6 \\to 3$$$, $$$7 \\to 5$$$).Write a program that finds the smallest total length of the shortest paths in kilometers and an example assignment of the new houses to the villagers.", "input_spec": "The first line contains an integer $$$N$$$ ($$$1 < N \\le 10^5$$$). Houses are numbered by consecutive integers $$$1, 2, \\ldots, N$$$. Then $$$N-1$$$ lines follow that describe the roads. Each line contains two integers $$$a$$$ and $$$b$$$ ($$$1 \\le a, b \\le N$$$, $$$a \\neq b$$$) denoting that there is a road connecting houses $$$a$$$ and $$$b$$$.", "output_spec": "In the first line output the smallest total length of the shortest paths in kilometers. In the second line describe one valid assignment of the new houses with the smallest total length: $$$N$$$ space-separated distinct integers $$$v_1, v_2, \\ldots, v_N$$$. For each $$$i$$$, $$$v_i$$$ is the house number where the villager from the house $$$i$$$ should move ($$$v_i \\neq i$$$). If there are several valid assignments, output any of those.", "sample_inputs": ["4\n1 2\n2 3\n3 4", "7\n4 2\n5 7\n3 4\n6 3\n1 3\n4 5"], "sample_outputs": ["4\n2 1 4 3", "8\n3 4 6 2 7 1 5"], "notes": null}, "src_uid": "98ded03cdd1870500667f0069d6a84b1"}
{"nl": {"description": "There is an airplane which has n rows from front to back. There will be m people boarding this airplane.This airplane has an entrance at the very front and very back of the plane.Each person has some assigned seat. It is possible for multiple people to have the same assigned seat. The people will then board the plane one by one starting with person 1. Each person can independently choose either the front entrance or back entrance to enter the plane.When a person walks into the plane, they walk directly to their assigned seat and will try to sit in it. If it is occupied, they will continue walking in the direction they walked in until they are at empty seat - they will take the earliest empty seat that they can find. If they get to the end of the row without finding a seat, they will be angry.Find the number of ways to assign tickets to the passengers and board the plane without anyone getting angry. Two ways are different if there exists a passenger who chose a different entrance in both ways, or the assigned seat is different. Print this count modulo 109\u2009+\u20097.", "input_spec": "The first line of input will contain two integers n,\u2009m (1\u2009\u2264\u2009m\u2009\u2264\u2009n\u2009\u2264\u20091\u2009000\u2009000), the number of seats, and the number of passengers, respectively.", "output_spec": "Print a single number, the number of ways, modulo 109\u2009+\u20097.", "sample_inputs": ["3 3"], "sample_outputs": ["128"], "notes": "NoteHere, we will denote a passenger by which seat they were assigned, and which side they came from (either \"F\" or \"B\" for front or back, respectively).For example, one valid way is 3B, 3B, 3B (i.e. all passengers were assigned seat 3 and came from the back entrance). Another valid way would be 2F, 1B, 3F.One invalid way would be 2B, 2B, 2B, since the third passenger would get to the front without finding a seat."}, "src_uid": "4f9711197e699c0fd0c4e9db8323cac7"}
{"nl": {"description": "Drazil is playing a math game with Varda.Let's define  for positive integer x as a product of factorials of its digits. For example, .First, they choose a decimal number a consisting of n digits that contains at least one digit larger than 1. This number may possibly start with leading zeroes. Then they should find maximum positive number x satisfying following two conditions:1. x doesn't contain neither digit 0 nor digit 1.2.  = .Help friends find such number.", "input_spec": "The first line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u200915) \u2014 the number of digits in a. The second line contains n digits of a. There is at least one digit in a that is larger than 1. Number a may possibly contain leading zeroes.", "output_spec": "Output a maximum possible integer satisfying the conditions above. There should be no zeroes and ones in this number decimal representation.", "sample_inputs": ["4\n1234", "3\n555"], "sample_outputs": ["33222", "555"], "notes": "NoteIn the first case, "}, "src_uid": "60dbfc7a65702ae8bd4a587db1e06398"}
{"nl": {"description": "For a sequence a of n integers between 1 and m, inclusive, denote f(a) as the number of distinct subsequences of a (including the empty subsequence).You are given two positive integers n and m. Let S be the set of all sequences of length n consisting of numbers from 1 to m. Compute the sum f(a) over all a in S modulo 109\u2009+\u20097.", "input_spec": "The only line contains two integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009106) \u2014 the number of elements in arrays and the upper bound for elements.", "output_spec": "Print the only integer c \u2014 the desired sum modulo 109\u2009+\u20097.", "sample_inputs": ["1 3", "2 2", "3 3"], "sample_outputs": ["6", "14", "174"], "notes": null}, "src_uid": "5b775f17b188c1d8a4da212ebb3a525c"}
{"nl": {"description": "Soon a school Olympiad in Informatics will be held in Berland, n schoolchildren will participate there.At a meeting of the jury of the Olympiad it was decided that each of the n participants, depending on the results, will get a diploma of the first, second or third degree. Thus, each student will receive exactly one diploma.They also decided that there must be given at least min1 and at most max1 diplomas of the first degree, at least min2 and at most max2 diplomas of the second degree, and at least min3 and at most max3 diplomas of the third degree.After some discussion it was decided to choose from all the options of distributing diplomas satisfying these limitations the one that maximizes the number of participants who receive diplomas of the first degree. Of all these options they select the one which maximizes the number of the participants who receive diplomas of the second degree. If there are multiple of these options, they select the option that maximizes the number of diplomas of the third degree.Choosing the best option of distributing certificates was entrusted to Ilya, one of the best programmers of Berland. However, he found more important things to do, so it is your task now to choose the best option of distributing of diplomas, based on the described limitations.It is guaranteed that the described limitations are such that there is a way to choose such an option of distributing diplomas that all n participants of the Olympiad will receive a diploma of some degree.", "input_spec": "The first line of the input contains a single integer n (3\u2009\u2264\u2009n\u2009\u2264\u20093\u00b7106)\u00a0\u2014\u00a0the number of schoolchildren who will participate in the Olympiad. The next line of the input contains two integers min1 and max1 (1\u2009\u2264\u2009min1\u2009\u2264\u2009max1\u2009\u2264\u2009106)\u00a0\u2014\u00a0the minimum and maximum limits on the number of diplomas of the first degree that can be distributed. The third line of the input contains two integers min2 and max2 (1\u2009\u2264\u2009min2\u2009\u2264\u2009max2\u2009\u2264\u2009106)\u00a0\u2014\u00a0the minimum and maximum limits on the number of diplomas of the second degree that can be distributed.  The next line of the input contains two integers min3 and max3 (1\u2009\u2264\u2009min3\u2009\u2264\u2009max3\u2009\u2264\u2009106)\u00a0\u2014\u00a0the minimum and maximum limits on the number of diplomas of the third degree that can be distributed.  It is guaranteed that min1\u2009+\u2009min2\u2009+\u2009min3\u2009\u2264\u2009n\u2009\u2264\u2009max1\u2009+\u2009max2\u2009+\u2009max3.", "output_spec": "In the first line of the output print three numbers, showing how many diplomas of the first, second and third degree will be given to students in the optimal variant of distributing diplomas. The optimal variant of distributing diplomas is the one that maximizes the number of students who receive diplomas of the first degree. Of all the suitable options, the best one is the one which maximizes the number of participants who receive diplomas of the second degree. If there are several of these options, the best one is the one that maximizes the number of diplomas of the third degree.", "sample_inputs": ["6\n1 5\n2 6\n3 7", "10\n1 2\n1 3\n1 5", "6\n1 3\n2 2\n2 2"], "sample_outputs": ["1 2 3", "2 3 5", "2 2 2"], "notes": null}, "src_uid": "3cd092b6507079518cf206deab21cf97"}
{"nl": {"description": "Prof. Vasechkin wants to represent positive integer n as a sum of addends, where each addends is an integer number containing only 1s. For example, he can represent 121 as 121=111+11+\u20131. Help him to find the least number of digits 1 in such sum.", "input_spec": "The first line of the input contains integer n (1\u2009\u2264\u2009n\u2009<\u20091015).", "output_spec": "Print expected minimal number of digits 1.", "sample_inputs": ["121"], "sample_outputs": ["6"], "notes": null}, "src_uid": "1b17a7b3b41077843ee1d6e0607720d6"}
{"nl": {"description": "There are literally dozens of snooker competitions held each year, and team Jinotega tries to attend them all (for some reason they prefer name \"snookah\")! When a competition takes place somewhere far from their hometown, Ivan, Artsem and Konstantin take a flight to the contest and back.Jinotega's best friends, team Base have found a list of their itinerary receipts with information about departure and arrival airports. Now they wonder, where is Jinotega now: at home or at some competition far away? They know that:   this list contains all Jinotega's flights in this year (in arbitrary order),  Jinotega has only flown from his hometown to a snooker contest and back,  after each competition Jinotega flies back home (though they may attend a competition in one place several times),  and finally, at the beginning of the year Jinotega was at home. Please help them to determine Jinotega's location!", "input_spec": "In the first line of input there is a single integer n: the number of Jinotega's flights (1\u2009\u2264\u2009n\u2009\u2264\u2009100). In the second line there is a string of 3 capital Latin letters: the name of Jinotega's home airport. In the next n lines there is flight information, one flight per line, in form \"XXX->YYY\", where \"XXX\" is the name of departure airport \"YYY\" is the name of arrival airport. Exactly one of these airports is Jinotega's home airport. It is guaranteed that flights information is consistent with the knowledge of Jinotega's friends, which is described in the main part of the statement.", "output_spec": "If Jinotega is now at home, print \"home\" (without quotes), otherwise print \"contest\".", "sample_inputs": ["4\nSVO\nSVO->CDG\nLHR->SVO\nSVO->LHR\nCDG->SVO", "3\nSVO\nSVO->HKT\nHKT->SVO\nSVO->RAP"], "sample_outputs": ["home", "contest"], "notes": "NoteIn the first sample Jinotega might first fly from SVO to CDG and back, and then from SVO to LHR and back, so now they should be at home. In the second sample Jinotega must now be at RAP because a flight from RAP back to SVO is not on the list."}, "src_uid": "51d1c79a52d3d4f80c98052b6ec77222"}
{"nl": {"description": "Two beavers, Timur and Marsel, play the following game.There are n logs, each of exactly m meters in length. The beavers move in turns. For each move a beaver chooses a log and gnaws it into some number (more than one) of equal parts, the length of each one is expressed by an integer and is no less than k meters. Each resulting part is also a log which can be gnawed in future by any beaver. The beaver that can't make a move loses. Thus, the other beaver wins.Timur makes the first move. The players play in the optimal way. Determine the winner.", "input_spec": "The first line contains three integers n, m, k (1\u2009\u2264\u2009n,\u2009m,\u2009k\u2009\u2264\u2009109).", "output_spec": "Print \"Timur\", if Timur wins, or \"Marsel\", if Marsel wins. You should print everything without the quotes. ", "sample_inputs": ["1 15 4", "4 9 5"], "sample_outputs": ["Timur", "Marsel"], "notes": "NoteIn the first sample the beavers only have one log, of 15 meters in length. Timur moves first. The only move he can do is to split the log into 3 parts each 5 meters in length. Then Marsel moves but he can't split any of the resulting logs, as k\u2009=\u20094. Thus, the winner is Timur.In the second example the beavers have 4 logs 9 meters in length. Timur can't split any of them, so that the resulting parts possessed the length of not less than 5 meters, that's why he loses instantly."}, "src_uid": "4a3767011ddac874efa021fff7c94432"}
{"nl": {"description": "Kolya got string s for his birthday, the string consists of small English letters. He immediately added k more characters to the right of the string.Then Borya came and said that the new string contained a tandem repeat of length l as a substring. How large could l be?See notes for definition of a tandem repeat.", "input_spec": "The first line contains s (1\u2009\u2264\u2009|s|\u2009\u2264\u2009200). This string contains only small English letters. The second line contains number k (1\u2009\u2264\u2009k\u2009\u2264\u2009200) \u2014 the number of the added characters.", "output_spec": "Print a single number \u2014 the maximum length of the tandem repeat that could have occurred in the new string.", "sample_inputs": ["aaba\n2", "aaabbbb\n2", "abracadabra\n10"], "sample_outputs": ["6", "6", "20"], "notes": "NoteA tandem repeat of length 2n is string s, where for any position i (1\u2009\u2264\u2009i\u2009\u2264\u2009n) the following condition fulfills: si\u2009=\u2009si\u2009+\u2009n.In the first sample Kolya could obtain a string aabaab, in the second \u2014 aaabbbbbb, in the third \u2014 abracadabrabracadabra."}, "src_uid": "bb65667b65ff069a9c0c9e8fe31da8ab"}
{"nl": {"description": "Today's morning was exceptionally snowy. Meshanya decided to go outside and noticed a huge snowball rolling down the mountain! Luckily, there are two stones on that mountain.Initially, snowball is at height $$$h$$$ and it has weight $$$w$$$. Each second the following sequence of events happens: snowball's weights increases by $$$i$$$, where $$$i$$$\u00a0\u2014 is the current height of snowball, then snowball hits the stone (if it's present at the current height), then snowball moves one meter down. If the snowball reaches height zero, it stops.There are exactly two stones on the mountain. First stone has weight $$$u_1$$$ and is located at height $$$d_1$$$, the second one\u00a0\u2014 $$$u_2$$$ and $$$d_2$$$ respectively. When the snowball hits either of two stones, it loses weight equal to the weight of that stone. If after this snowball has negative weight, then its weight becomes zero, but the snowball continues moving as before.  Find the weight of the snowball when it stops moving, that is, it reaches height\u00a00.", "input_spec": "First line contains two integers $$$w$$$ and $$$h$$$\u00a0\u2014 initial weight and height of the snowball ($$$0 \\le w \\le 100$$$; $$$1 \\le h \\le 100$$$). Second line contains two integers $$$u_1$$$ and $$$d_1$$$\u00a0\u2014 weight and height of the first stone ($$$0 \\le u_1 \\le 100$$$; $$$1 \\le d_1 \\le h$$$). Third line contains two integers $$$u_2$$$ and $$$d_2$$$\u00a0\u2014 weight and heigth of the second stone ($$$0 \\le u_2 \\le 100$$$; $$$1 \\le d_2 \\le h$$$; $$$d_1 \\ne d_2$$$). Notice that stones always have different heights.", "output_spec": "Output a single integer\u00a0\u2014 final weight of the snowball after it reaches height\u00a00.", "sample_inputs": ["4 3\n1 1\n1 2", "4 3\n9 2\n0 1"], "sample_outputs": ["8", "1"], "notes": "NoteIn the first example, initially a snowball of weight 4 is located at a height of 3, there are two stones of weight 1, at a height of 1 and 2, respectively. The following events occur sequentially:   The weight of the snowball increases by 3 (current height), becomes equal to 7.  The snowball moves one meter down, the current height becomes equal to 2.  The weight of the snowball increases by 2 (current height), becomes equal to 9.  The snowball hits the stone, its weight decreases by 1 (the weight of the stone), becomes equal to 8.  The snowball moves one meter down, the current height becomes equal to 1.  The weight of the snowball increases by 1 (current height), becomes equal to 9.  The snowball hits the stone, its weight decreases by 1 (the weight of the stone), becomes equal to 8.  The snowball moves one meter down, the current height becomes equal to 0. Thus, at the end the weight of the snowball is equal to 8."}, "src_uid": "084a12eb3a708b43b880734f3ee51374"}
{"nl": {"description": "One beautiful July morning a terrible thing happened in Mainframe: a mean virus Megabyte somehow got access to the memory of his not less mean sister Hexadecimal. He loaded there a huge amount of n different natural numbers from 1 to n to obtain total control over her energy.But his plan failed. The reason for this was very simple: Hexadecimal didn't perceive any information, apart from numbers written in binary format. This means that if a number in a decimal representation contained characters apart from 0 and 1, it was not stored in the memory. Now Megabyte wants to know, how many numbers were loaded successfully.", "input_spec": "Input data contains the only number n (1\u2009\u2264\u2009n\u2009\u2264\u2009109).", "output_spec": "Output the only number \u2014 answer to the problem.", "sample_inputs": ["10"], "sample_outputs": ["2"], "notes": "NoteFor n = 10 the answer includes numbers 1 and 10."}, "src_uid": "64a842f9a41f85a83b7d65bfbe21b6cb"}
{"nl": {"description": "Ivan has a robot which is situated on an infinite grid. Initially the robot is standing in the starting cell (0,\u20090). The robot can process commands. There are four types of commands it can perform:  U \u2014 move from the cell (x,\u2009y) to (x,\u2009y\u2009+\u20091);  D \u2014 move from (x,\u2009y) to (x,\u2009y\u2009-\u20091);  L \u2014 move from (x,\u2009y) to (x\u2009-\u20091,\u2009y);  R \u2014 move from (x,\u2009y) to (x\u2009+\u20091,\u2009y). Ivan entered a sequence of n commands, and the robot processed it. After this sequence the robot ended up in the starting cell (0,\u20090), but Ivan doubts that the sequence is such that after performing it correctly the robot ends up in the same cell. He thinks that some commands were ignored by robot. To acknowledge whether the robot is severely bugged, he needs to calculate the maximum possible number of commands that were performed correctly. Help Ivan to do the calculations!", "input_spec": "The first line contains one number n \u2014 the length of sequence of commands entered by Ivan (1\u2009\u2264\u2009n\u2009\u2264\u2009100). The second line contains the sequence itself \u2014 a string consisting of n characters. Each character can be U, D, L or R.", "output_spec": "Print the maximum possible number of commands from the sequence the robot could perform to end up in the starting cell.", "sample_inputs": ["4\nLDUR", "5\nRRRUU", "6\nLLRRRR"], "sample_outputs": ["4", "0", "4"], "notes": null}, "src_uid": "b9fa2bb8001bd064ede531a5281cfd8a"}
{"nl": {"description": "Gerald is setting the New Year table. The table has the form of a circle; its radius equals R. Gerald invited many guests and is concerned whether the table has enough space for plates for all those guests. Consider all plates to be round and have the same radii that equal r. Each plate must be completely inside the table and must touch the edge of the table. Of course, the plates must not intersect, but they can touch each other. Help Gerald determine whether the table is large enough for n plates.", "input_spec": "The first line contains three integers n, R and r (1\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009r,\u2009R\u2009\u2264\u20091000) \u2014 the number of plates, the radius of the table and the plates' radius.", "output_spec": "Print \"YES\" (without the quotes) if it is possible to place n plates on the table by the rules given above. If it is impossible, print \"NO\". Remember, that each plate must touch the edge of the table. ", "sample_inputs": ["4 10 4", "5 10 4", "1 10 10"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteThe possible arrangement of the plates for the first sample is:   "}, "src_uid": "2fedbfccd893cde8f2fab2b5bf6fb6f6"}
{"nl": {"description": "Alice likes word \"nineteen\" very much. She has a string s and wants the string to contain as many such words as possible. For that reason she can rearrange the letters of the string.For example, if she has string \"xiineteenppnnnewtnee\", she can get string \"xnineteenppnineteenw\", containing (the occurrences marked) two such words. More formally, word \"nineteen\" occurs in the string the number of times you can read it starting from some letter of the string. Of course, you shouldn't skip letters.Help her to find the maximum number of \"nineteen\"s that she can get in her string.", "input_spec": "The first line contains a non-empty string s, consisting only of lowercase English letters. The length of string s doesn't exceed 100.", "output_spec": "Print a single integer \u2014 the maximum number of \"nineteen\"s that she can get in her string.", "sample_inputs": ["nniinneetteeeenn", "nneteenabcnneteenabcnneteenabcnneteenabcnneteenabcii", "nineteenineteen"], "sample_outputs": ["2", "2", "2"], "notes": null}, "src_uid": "bb433cdb8299afcf46cb2797cbfbf724"}
{"nl": {"description": "Gerald bought two very rare paintings at the Sotheby's auction and he now wants to hang them on the wall. For that he bought a special board to attach it to the wall and place the paintings on the board. The board has shape of an a1\u2009\u00d7\u2009b1 rectangle, the paintings have shape of a a2\u2009\u00d7\u2009b2 and a3\u2009\u00d7\u2009b3 rectangles.Since the paintings are painted in the style of abstract art, it does not matter exactly how they will be rotated, but still, one side of both the board, and each of the paintings must be parallel to the floor. The paintings can touch each other and the edges of the board, but can not overlap or go beyond the edge of the board. Gerald asks whether it is possible to place the paintings on the board, or is the board he bought not large enough?", "input_spec": "The first line contains two space-separated numbers a1 and b1 \u2014 the sides of the board. Next two lines contain numbers a2,\u2009b2,\u2009a3 and b3 \u2014 the sides of the paintings. All numbers ai,\u2009bi in the input are integers and fit into the range from 1 to 1000.", "output_spec": "If the paintings can be placed on the wall, print \"YES\" (without the quotes), and if they cannot, print \"NO\" (without the quotes).", "sample_inputs": ["3 2\n1 3\n2 1", "5 5\n3 3\n3 3", "4 2\n2 3\n1 2"], "sample_outputs": ["YES", "NO", "YES"], "notes": "NoteThat's how we can place the pictures in the first test:And that's how we can do it in the third one."}, "src_uid": "2ff30d9c4288390fd7b5b37715638ad9"}
{"nl": {"description": "Define the beauty of a permutation of numbers from $$$1$$$ to $$$n$$$ $$$(p_1, p_2, \\dots, p_n)$$$ as number of pairs $$$(L, R)$$$ such that $$$1 \\le L \\le R \\le n$$$ and numbers $$$p_L, p_{L+1}, \\dots, p_R$$$ are consecutive $$$R-L+1$$$ numbers in some order. For example, the beauty of the permutation $$$(1, 2, 5, 3, 4)$$$ equals $$$9$$$, and segments, corresponding to pairs, are $$$[1]$$$, $$$[2]$$$, $$$[5]$$$, $$$[4]$$$, $$$[3]$$$, $$$[1, 2]$$$, $$$[3, 4]$$$, $$$[5, 3, 4]$$$, $$$[1, 2, 5, 3, 4]$$$.Answer $$$q$$$ independent queries. In each query, you will be given integers $$$n$$$ and $$$k$$$. Determine if there exists a permutation of numbers from $$$1$$$ to $$$n$$$ with beauty equal to $$$k$$$, and if there exists, output one of them.", "input_spec": "The first line contains a single integer $$$q$$$ ($$$1\\le q \\le 10\\,000$$$)\u00a0\u2014 the number of queries. Follow $$$q$$$ lines. Each line contains two integers $$$n$$$, $$$k$$$ ($$$1 \\le n \\le 100$$$, $$$1 \\le k \\le \\frac{n(n+1)}{2}$$$)\u00a0\u2014 the length of permutation and needed beauty respectively.", "output_spec": "For a query output \"NO\", if such a permutation doesn't exist. Otherwise, output \"YES\", and in the next line output $$$n$$$ numbers\u00a0\u2014 elements of permutation in the right order.", "sample_inputs": ["4\n1 1\n5 6\n5 8\n5 10", "2\n4 10\n100 1"], "sample_outputs": ["YES\n1 \nYES\n2 4 1 5 3 \nNO\nYES\n2 3 1 4 5", "YES\n1 2 3 4 \nNO"], "notes": "NoteLet's look at the first example.The first query: in $$$(1)$$$ there is only one segment consisting of consecutive numbers \u2014 the entire permutation.The second query: in $$$(2, 4, 1, 5, 3)$$$ there are $$$6$$$ such segments: $$$[2]$$$, $$$[4]$$$, $$$[1]$$$, $$$[5]$$$, $$$[3]$$$, $$$[2, 4, 1, 5, 3]$$$.There is no such permutation for the second query.The fourth query: in $$$(2, 3, 1, 4, 5)$$$ there are $$$10$$$ such segments: $$$[2]$$$, $$$[3]$$$, $$$[1]$$$, $$$[4]$$$, $$$[5]$$$, $$$[2, 3]$$$, $$$[2, 3, 1]$$$, $$$[2, 3, 1, 4]$$$, $$$[4, 5]$$$, $$$[2, 3, 1, 4, 5]$$$."}, "src_uid": "23227ee76104780e16f366188938bca2"}
{"nl": {"description": "One tradition of welcoming the New Year is launching fireworks into the sky. Usually a launched firework flies vertically upward for some period of time, then explodes, splitting into several parts flying in different directions. Sometimes those parts also explode after some period of time, splitting into even more parts, and so on.Limak, who lives in an infinite grid, has a single firework. The behaviour of the firework is described with a recursion depth n and a duration for each level of recursion t1,\u2009t2,\u2009...,\u2009tn. Once Limak launches the firework in some cell, the firework starts moving upward. After covering t1 cells (including the starting cell), it explodes and splits into two parts, each moving in the direction changed by 45 degrees (see the pictures below for clarification). So, one part moves in the top-left direction, while the other one moves in the top-right direction. Each part explodes again after covering t2 cells, splitting into two parts moving in directions again changed by 45 degrees. The process continues till the n-th level of recursion, when all 2n\u2009-\u20091 existing parts explode and disappear without creating new parts. After a few levels of recursion, it's possible that some parts will be at the same place and at the same time\u00a0\u2014 it is allowed and such parts do not crash.Before launching the firework, Limak must make sure that nobody stands in cells which will be visited at least once by the firework. Can you count the number of those cells?", "input_spec": "The first line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u200930)\u00a0\u2014 the total depth of the recursion. The second line contains n integers t1,\u2009t2,\u2009...,\u2009tn (1\u2009\u2264\u2009ti\u2009\u2264\u20095). On the i-th level each of 2i\u2009-\u20091 parts will cover ti cells before exploding.", "output_spec": "Print one integer, denoting the number of cells which will be visited at least once by any part of the firework.", "sample_inputs": ["4\n4 2 2 3", "6\n1 1 1 1 1 3", "1\n3"], "sample_outputs": ["39", "85", "3"], "notes": "NoteFor the first sample, the drawings below show the situation after each level of recursion. Limak launched the firework from the bottom-most red cell. It covered t1\u2009=\u20094 cells (marked red), exploded and divided into two parts (their further movement is marked green). All explosions are marked with an 'X' character. On the last drawing, there are 4 red, 4 green, 8 orange and 23 pink cells. So, the total number of visited cells is 4\u2009+\u20094\u2009+\u20098\u2009+\u200923\u2009=\u200939.  For the second sample, the drawings below show the situation after levels 4, 5 and 6. The middle drawing shows directions of all parts that will move in the next level.  "}, "src_uid": "a96bc7f93fe9d9d4b78018b49bbc68d9"}
{"nl": {"description": "Dima and Anya love playing different games. Now Dima has imagined a new game that he wants to play with Anya.Dima writes n pairs of integers on a piece of paper (li,\u2009ri) (1\u2009\u2264\u2009li\u2009<\u2009ri\u2009\u2264\u2009p). Then players take turns. On his turn the player can do the following actions:  choose the number of the pair i (1\u2009\u2264\u2009i\u2009\u2264\u2009n), such that ri\u2009-\u2009li\u2009>\u20092;  replace pair number i by pair  or by pair . Notation \u230ax\u230b means rounding down to the closest integer. The player who can't make a move loses.Of course, Dima wants Anya, who will move first, to win. That's why Dima should write out such n pairs of integers (li,\u2009ri) (1\u2009\u2264\u2009li\u2009<\u2009ri\u2009\u2264\u2009p), that if both players play optimally well, the first one wins. Count the number of ways in which Dima can do it. Print the remainder after dividing the answer by number 1000000007\u00a0(109\u2009+\u20097).Two ways are considered distinct, if the ordered sequences of the written pairs are distinct.", "input_spec": "The first line contains two integers n, p (1\u2009\u2264\u2009n\u2009\u2264\u20091000,\u20091\u2009\u2264\u2009p\u2009\u2264\u2009109). The numbers are separated by a single space.", "output_spec": "In a single line print the remainder after dividing the answer to the problem by number 1000000007\u00a0(109\u2009+\u20097).", "sample_inputs": ["2 2", "4 4", "100 1000"], "sample_outputs": ["0", "520", "269568947"], "notes": null}, "src_uid": "c03b6379e9d186874ac3d97c6968fbd0"}
{"nl": {"description": "A magic number is a number formed by concatenation of numbers 1, 14 and 144. We can use each of these numbers any number of times. Therefore 14144, 141414 and 1411 are magic numbers but 1444, 514 and 414 are not.You're given a number. Determine if it is a magic number or not.", "input_spec": "The first line of input contains an integer n, (1\u2009\u2264\u2009n\u2009\u2264\u2009109). This number doesn't contain leading zeros.", "output_spec": "Print \"YES\" if n is a magic number or print \"NO\" if it's not.", "sample_inputs": ["114114", "1111", "441231"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "3153cfddae27fbd817caaf2cb7a6a4b5"}
{"nl": {"description": "You have two positive integers w and h. Your task is to count the number of rhombi which have the following properties:   Have positive area.  With vertices at integer points.  All vertices of the rhombi are located inside or on the border of the rectangle with vertices at points (0,\u20090), (w,\u20090), (w,\u2009h), (0,\u2009h). In other words, for all vertices (xi,\u2009yi) of the rhombus the following conditions should fulfill: 0\u2009\u2264\u2009xi\u2009\u2264\u2009w and 0\u2009\u2264\u2009yi\u2009\u2264\u2009h.  Its diagonals are parallel to the axis.  Count the number of such rhombi.Let us remind you that a rhombus is a quadrilateral whose four sides all have the same length.", "input_spec": "The first line contains two integers w and h (1\u2009\u2264\u2009w,\u2009h\u2009\u2264\u20094000) \u2014 the rectangle's sizes.", "output_spec": "Print a single number \u2014 the number of sought rhombi. Please do not use the %lld specifier to read or write 64-bit integers in \u0421++. It is preferred to use cin, cout streams or the %I64d specifier.", "sample_inputs": ["2 2", "1 2"], "sample_outputs": ["1", "0"], "notes": "NoteIn the first example there exists only one such rhombus. Its vertices are located at points (1,\u20090), (2,\u20091), (1,\u20092), (0,\u20091)."}, "src_uid": "42454dcf7d073bf12030367eb094eb8c"}
{"nl": {"description": "After winning gold and silver in IOI 2014, Akshat and Malvika want to have some fun. Now they are playing a game on a grid made of n horizontal and m vertical sticks.An intersection point is any point on the grid which is formed by the intersection of one horizontal stick and one vertical stick.In the grid shown below, n\u2009=\u20093 and m\u2009=\u20093. There are n\u2009+\u2009m\u2009=\u20096 sticks in total (horizontal sticks are shown in red and vertical sticks are shown in green). There are n\u00b7m\u2009=\u20099 intersection points, numbered from 1 to 9.  The rules of the game are very simple. The players move in turns. Akshat won gold, so he makes the first move. During his/her move, a player must choose any remaining intersection point and remove from the grid all sticks which pass through this point. A player will lose the game if he/she cannot make a move (i.e. there are no intersection points remaining on the grid at his/her move).Assume that both players play optimally. Who will win the game?", "input_spec": "The first line of input contains two space-separated integers, n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100).", "output_spec": "Print a single line containing \"Akshat\" or \"Malvika\" (without the quotes), depending on the winner of the game.", "sample_inputs": ["2 2", "2 3", "3 3"], "sample_outputs": ["Malvika", "Malvika", "Akshat"], "notes": "NoteExplanation of the first sample:The grid has four intersection points, numbered from 1 to 4.  If Akshat chooses intersection point 1, then he will remove two sticks (1\u2009-\u20092 and 1\u2009-\u20093). The resulting grid will look like this.  Now there is only one remaining intersection point (i.e. 4). Malvika must choose it and remove both remaining sticks. After her move the grid will be empty.In the empty grid, Akshat cannot make any move, hence he will lose.Since all 4 intersection points of the grid are equivalent, Akshat will lose no matter which one he picks."}, "src_uid": "a4b9ce9c9f170a729a97af13e81b5fe4"}
{"nl": {"description": "There are well-known formulas: , , . Also mathematicians found similar formulas for higher degrees.Find the value of the sum  modulo 109\u2009+\u20097 (so you should find the remainder after dividing the answer by the value 109\u2009+\u20097).", "input_spec": "The only line contains two integers n,\u2009k (1\u2009\u2264\u2009n\u2009\u2264\u2009109,\u20090\u2009\u2264\u2009k\u2009\u2264\u2009106).", "output_spec": "Print the only integer a \u2014 the remainder after dividing the value of the sum by the value 109\u2009+\u20097.", "sample_inputs": ["4 1", "4 2", "4 3", "4 0"], "sample_outputs": ["10", "30", "100", "4"], "notes": null}, "src_uid": "6f6fc42a367cdce60d76fd1914e73f0c"}
{"nl": {"description": "Vasya plays Robot Bicorn Attack.The game consists of three rounds. For each one a non-negative integer amount of points is given. The result of the game is the sum of obtained points. Vasya has already played three rounds and wrote obtained points one by one (without leading zeros) into the string s. Vasya decided to brag about his achievement to the friends. However, he has forgotten how many points he got for each round. The only thing he remembers is the string s.Help Vasya to find out what is the maximum amount of points he could get. Take into account that Vasya played Robot Bicorn Attack for the first time, so he could not get more than 1000000 (106) points for one round.", "input_spec": "The only line of input contains non-empty string s obtained by Vasya. The string consists of digits only. The string length does not exceed 30 characters.", "output_spec": "Print the only number \u2014 the maximum amount of points Vasya could get. If Vasya is wrong and the string could not be obtained according to the rules then output number -1.", "sample_inputs": ["1234", "9000", "0009"], "sample_outputs": ["37", "90", "-1"], "notes": "NoteIn the first example the string must be split into numbers 1, 2 and 34.In the second example the string must be split into numbers 90, 0 and 0. In the third example the string is incorrect, because after splitting the string into 3 numbers number 00 or 09 will be obtained, but numbers cannot have leading zeroes."}, "src_uid": "bf4e72636bd1998ad3d034ad72e63097"}
{"nl": {"description": "Given 2 integers $$$u$$$ and $$$v$$$, find the shortest array such that bitwise-xor of its elements is $$$u$$$, and the sum of its elements is $$$v$$$.", "input_spec": "The only line contains 2 integers $$$u$$$ and $$$v$$$ $$$(0 \\le u,v \\le 10^{18})$$$.", "output_spec": "If there's no array that satisfies the condition, print \"-1\". Otherwise: The first line should contain one integer, $$$n$$$, representing the length of the desired array. The next line should contain $$$n$$$ positive integers, the array itself. If there are multiple possible answers, print any.", "sample_inputs": ["2 4", "1 3", "8 5", "0 0"], "sample_outputs": ["2\n3 1", "3\n1 1 1", "-1", "0"], "notes": "NoteIn the first sample, $$$3\\oplus 1 = 2$$$ and $$$3 + 1 = 4$$$. There is no valid array of smaller length.Notice that in the fourth sample the array is empty."}, "src_uid": "490f23ced6c43f9e12f1bcbecbb14904"}
{"nl": {"description": "It is a balmy spring afternoon, and Farmer John's n cows are ruminating about link-cut cacti in their stalls. The cows, labeled 1 through n, are arranged so that the i-th cow occupies the i-th stall from the left. However, Elsie, after realizing that she will forever live in the shadows beyond Bessie's limelight, has formed the Mischievous Mess Makers and is plotting to disrupt this beautiful pastoral rhythm. While Farmer John takes his k minute long nap, Elsie and the Mess Makers plan to repeatedly choose two distinct stalls and swap the cows occupying those stalls, making no more than one swap each minute.Being the meticulous pranksters that they are, the Mischievous Mess Makers would like to know the maximum messiness attainable in the k minutes that they have. We denote as pi the label of the cow in the i-th stall. The messiness of an arrangement of cows is defined as the number of pairs (i,\u2009j) such that i\u2009<\u2009j and pi\u2009>\u2009pj.", "input_spec": "The first line of the input contains two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u2009100\u2009000)\u00a0\u2014 the number of cows and the length of Farmer John's nap, respectively.", "output_spec": "Output a single integer, the maximum messiness that the Mischievous Mess Makers can achieve by performing no more than k swaps. ", "sample_inputs": ["5 2", "1 10"], "sample_outputs": ["10", "0"], "notes": "NoteIn the first sample, the Mischievous Mess Makers can swap the cows in the stalls 1 and 5 during the first minute, then the cows in stalls 2 and 4 during the second minute. This reverses the arrangement of cows, giving us a total messiness of 10.In the second sample, there is only one cow, so the maximum possible messiness is 0."}, "src_uid": "ea36ca0a3c336424d5b7e1b4c56947b0"}
{"nl": {"description": "On the way to Rio de Janeiro Ostap kills time playing with a grasshopper he took with him in a special box. Ostap builds a line of length n such that some cells of this line are empty and some contain obstacles. Then, he places his grasshopper to one of the empty cells and a small insect in another empty cell. The grasshopper wants to eat the insect.Ostap knows that grasshopper is able to jump to any empty cell that is exactly k cells away from the current (to the left or to the right). Note that it doesn't matter whether intermediate cells are empty or not as the grasshopper makes a jump over them. For example, if k\u2009=\u20091 the grasshopper can jump to a neighboring cell only, and if k\u2009=\u20092 the grasshopper can jump over a single cell.Your goal is to determine whether there is a sequence of jumps such that grasshopper will get from his initial position to the cell with an insect.", "input_spec": "The first line of the input contains two integers n and k (2\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009-\u20091)\u00a0\u2014 the number of cells in the line and the length of one grasshopper's jump. The second line contains a string of length n consisting of characters '.', '#', 'G' and 'T'. Character '.' means that the corresponding cell is empty, character '#' means that the corresponding cell contains an obstacle and grasshopper can't jump there. Character 'G' means that the grasshopper starts at this position and, finally, 'T' means that the target insect is located at this cell. It's guaranteed that characters 'G' and 'T' appear in this line exactly once.", "output_spec": "If there exists a sequence of jumps (each jump of length k), such that the grasshopper can get from his initial position to the cell with the insect, print \"YES\" (without quotes) in the only line of the input. Otherwise, print \"NO\" (without quotes).", "sample_inputs": ["5 2\n#G#T#", "6 1\nT....G", "7 3\nT..#..G", "6 2\n..GT.."], "sample_outputs": ["YES", "YES", "NO", "NO"], "notes": "NoteIn the first sample, the grasshopper can make one jump to the right in order to get from cell 2 to cell 4.In the second sample, the grasshopper is only able to jump to neighboring cells but the way to the insect is free\u00a0\u2014 he can get there by jumping left 5 times.In the third sample, the grasshopper can't make a single jump.In the fourth sample, the grasshopper can only jump to the cells with odd indices, thus he won't be able to reach the insect."}, "src_uid": "189a9b5ce669bdb04b9d371d74a5dd41"}
{"nl": {"description": "Little Dima misbehaved during a math lesson a lot and the nasty teacher Mr. Pickles gave him the following problem as a punishment. Find all integer solutions x (0\u2009<\u2009x\u2009<\u2009109) of the equation:x\u2009=\u2009b\u00b7s(x)a\u2009+\u2009c,\u2009 where a, b, c are some predetermined constant values and function s(x) determines the sum of all digits in the decimal representation of number x.The teacher gives this problem to Dima for each lesson. He changes only the parameters of the equation: a, b, c. Dima got sick of getting bad marks and he asks you to help him solve this challenging problem.", "input_spec": "The first line contains three space-separated integers: a,\u2009b,\u2009c (1\u2009\u2264\u2009a\u2009\u2264\u20095;\u00a01\u2009\u2264\u2009b\u2009\u2264\u200910000;\u00a0\u2009-\u200910000\u2009\u2264\u2009c\u2009\u2264\u200910000).", "output_spec": "Print integer n \u2014 the number of the solutions that you've found. Next print n integers in the increasing order \u2014 the solutions of the given equation. Print only integer solutions that are larger than zero and strictly less than 109.", "sample_inputs": ["3 2 8", "1 2 -18", "2 2 -1"], "sample_outputs": ["3\n10 2008 13726", "0", "4\n1 31 337 967"], "notes": null}, "src_uid": "e477185b94f93006d7ae84c8f0817009"}
{"nl": {"description": "In one very old text file there was written Great Wisdom. This Wisdom was so Great that nobody could decipher it, even Phong \u2014 the oldest among the inhabitants of Mainframe. But still he managed to get some information from there. For example, he managed to learn that User launches games for pleasure \u2014 and then terrible Game Cubes fall down on the city, bringing death to those modules, who cannot win the game...For sure, as guard Bob appeared in Mainframe many modules stopped fearing Game Cubes. Because Bob (as he is alive yet) has never been defeated by User, and he always meddles with Game Cubes, because he is programmed to this.However, unpleasant situations can happen, when a Game Cube falls down on Lost Angles. Because there lives a nasty virus \u2014 Hexadecimal, who is... mmm... very strange. And she likes to play very much. So, willy-nilly, Bob has to play with her first, and then with User.This time Hexadecimal invented the following entertainment: Bob has to leap over binary search trees with n nodes. We should remind you that a binary search tree is a binary tree, each node has a distinct key, for each node the following is true: the left sub-tree of a node contains only nodes with keys less than the node's key, the right sub-tree of a node contains only nodes with keys greater than the node's key. All the keys are different positive integer numbers from 1 to n. Each node of such a tree can have up to two children, or have no children at all (in the case when a node is a leaf).In Hexadecimal's game all the trees are different, but the height of each is not lower than h. In this problem \u00abheight\u00bb stands for the maximum amount of nodes on the way from the root to the remotest leaf, the root node and the leaf itself included. When Bob leaps over a tree, it disappears. Bob gets the access to a Cube, when there are no trees left. He knows how many trees he will have to leap over in the worst case. And you?", "input_spec": "The input data contains two space-separated positive integer numbers n and h (n\u2009\u2264\u200935, h\u2009\u2264\u2009n).", "output_spec": "Output one number \u2014 the answer to the problem. It is guaranteed that it does not exceed 9\u00b71018.", "sample_inputs": ["3 2", "3 3"], "sample_outputs": ["5", "4"], "notes": null}, "src_uid": "faf12a603d0c27f8be6bf6b02531a931"}
{"nl": {"description": "Dima and Seryozha live in an ordinary dormitory room for two. One day Dima had a date with his girl and he asked Seryozha to leave the room. As a compensation, Seryozha made Dima do his homework.The teacher gave Seryozha the coordinates of n distinct points on the abscissa axis and asked to consecutively connect them by semi-circus in a certain order: first connect the first point with the second one, then connect the second point with the third one, then the third one with the fourth one and so on to the n-th point. Two points with coordinates (x1,\u20090) and (x2,\u20090) should be connected by a semi-circle that passes above the abscissa axis with the diameter that coincides with the segment between points. Seryozha needs to find out if the line on the picture intersects itself. For clarifications, see the picture Seryozha showed to Dima (the left picture has self-intersections, the right picture doesn't have any).  Seryozha is not a small boy, so the coordinates of the points can be rather large. Help Dima cope with the problem.", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009103). The second line contains n distinct integers x1,\u2009x2,\u2009...,\u2009xn (\u2009-\u2009106\u2009\u2264\u2009xi\u2009\u2264\u2009106) \u2014 the i-th point has coordinates (xi,\u20090). The points are not necessarily sorted by their x coordinate.", "output_spec": "In the single line print \"yes\" (without the quotes), if the line has self-intersections. Otherwise, print \"no\" (without the quotes).", "sample_inputs": ["4\n0 10 5 15", "4\n0 15 5 10"], "sample_outputs": ["yes", "no"], "notes": "NoteThe first test from the statement is on the picture to the left, the second test is on the picture to the right."}, "src_uid": "f1b6b81ebd49f31428fe57913dfc604d"}
{"nl": {"description": "Consider an array $$$a$$$ of length $$$n$$$ with elements numbered from $$$1$$$ to $$$n$$$. It is possible to remove the $$$i$$$-th element of $$$a$$$ if $$$gcd(a_i, i) = 1$$$, where $$$gcd$$$ denotes the greatest common divisor. After an element is removed, the elements to the right are shifted to the left by one position.An array $$$b$$$ with $$$n$$$ integers such that $$$1 \\le b_i \\le n - i + 1$$$ is a removal sequence for the array $$$a$$$ if it is possible to remove all elements of $$$a$$$, if you remove the $$$b_1$$$-th element, then the $$$b_2$$$-th, ..., then the $$$b_n$$$-th element. For example, let $$$a = [42, 314]$$$:  $$$[1, 1]$$$ is a removal sequence: when you remove the $$$1$$$-st element of the array, the condition $$$gcd(42, 1) = 1$$$ holds, and the array becomes $$$[314]$$$; when you remove the $$$1$$$-st element again, the condition $$$gcd(314, 1) = 1$$$ holds, and the array becomes empty.  $$$[2, 1]$$$ is not a removal sequence: when you try to remove the $$$2$$$-nd element, the condition $$$gcd(314, 2) = 1$$$ is false. An array is ambiguous if it has at least two removal sequences. For example, the array $$$[1, 2, 5]$$$ is ambiguous: it has removal sequences $$$[3, 1, 1]$$$ and $$$[1, 2, 1]$$$. The array $$$[42, 314]$$$ is not ambiguous: the only removal sequence it has is $$$[1, 1]$$$.You are given two integers $$$n$$$ and $$$m$$$. You have to calculate the number of ambiguous arrays $$$a$$$ such that the length of $$$a$$$ is from $$$1$$$ to $$$n$$$ and each $$$a_i$$$ is an integer from $$$1$$$ to $$$m$$$.", "input_spec": "The only line of the input contains two integers $$$n$$$ and $$$m$$$ ($$$2 \\le n \\le 3 \\cdot 10^5$$$; $$$1 \\le m \\le 10^{12}$$$).", "output_spec": "Print one integer \u2014 the number of ambiguous arrays $$$a$$$ such that the length of $$$a$$$ is from $$$1$$$ to $$$n$$$ and each $$$a_i$$$ is an integer from $$$1$$$ to $$$m$$$. Since the answer can be very large, print it modulo $$$998244353$$$.", "sample_inputs": ["2 3", "4 2", "4 6", "1337 424242424242"], "sample_outputs": ["6", "26", "1494", "119112628"], "notes": null}, "src_uid": "0fdd91ed33431848614075ebe9d2ee68"}
{"nl": {"description": "Let's call a string a phone number if it has length 11 and fits the pattern \"8xxxxxxxxxx\", where each \"x\" is replaced by a digit.For example, \"80123456789\" and \"80000000000\" are phone numbers, while \"8012345678\" and \"79000000000\" are not.You have $$$n$$$ cards with digits, and you want to use them to make as many phone numbers as possible. Each card must be used in at most one phone number, and you don't have to use all cards. The phone numbers do not necessarily have to be distinct.", "input_spec": "The first line contains an integer $$$n$$$\u00a0\u2014 the number of cards with digits that you have ($$$1 \\leq n \\leq 100$$$). The second line contains a string of $$$n$$$ digits (characters \"0\", \"1\", ..., \"9\") $$$s_1, s_2, \\ldots, s_n$$$. The string will not contain any other characters, such as leading or trailing spaces.", "output_spec": "If at least one phone number can be made from these cards, output the maximum number of phone numbers that can be made. Otherwise, output 0.", "sample_inputs": ["11\n00000000008", "22\n0011223344556677889988", "11\n31415926535"], "sample_outputs": ["1", "2", "0"], "notes": "NoteIn the first example, one phone number, \"8000000000\", can be made from these cards.In the second example, you can make two phone numbers from the cards, for example, \"80123456789\" and \"80123456789\".In the third example you can't make any phone number from the given cards."}, "src_uid": "259d01b81bef5536b969247ff2c2d776"}
{"nl": {"description": "Madoka decided to entrust the organization of a major computer game tournament \"OSU\"!In this tournament, matches are held according to the \"Olympic system\". In other words, there are $$$2^n$$$ participants in the tournament, numbered with integers from $$$1$$$ to $$$2^n$$$. There are $$$n$$$ rounds in total in the tournament. In the $$$i$$$-th round there are $$$2^{n - i}$$$ matches between two players (one of whom is right, the other is left), after which the winners go further along the tournament grid, and the losing participants are eliminated from the tournament. Herewith, the relative order in the next round does not change. And the winner of the tournament\u00a0\u2014 is the last remaining participant.But the smaller the participant's number, the more he will pay Madoka if he wins, so Madoka wants the participant with the lowest number to win. To do this, she can arrange the participants in the first round as she likes, and also determine for each match who will win\u00a0\u2014 the participant on the left or right.But Madoka knows that tournament sponsors can change the winner in matches no more than $$$k$$$ times. (That is, if the participant on the left won before the change, then the participant on the right will win after the change, and if the participant on the right won, then the participant on the left will win after the change).  So, the first image shows the tournament grid that Madoka made, where the red lines denote who should win the match. And the second one shows the tournament grid, after one change in the outcome of the match by sponsors (a match between $$$1$$$ and $$$3$$$ players). Print the minimum possible number of the winner in the tournament, which Madoka can get regardless of changes in sponsors. But since the answer can be very large, output it modulo $$$10^9 + 7$$$. Note that we need to minimize the answer, and only then take it modulo.", "input_spec": "The first and the only line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 10^5, 1 \\le k \\le \\min(2^n - 1, 10^9)$$$)\u00a0\u2014 the number of rounds in the tournament and the number of outcomes that sponsors can change.", "output_spec": "Print exactly one integer\u00a0\u2014 the minimum number of the winner modulo $$$10^9 + 7$$$", "sample_inputs": ["1 1", "2 1", "3 2"], "sample_outputs": ["2", "3", "7"], "notes": "NoteIn the first example, there is only one match between players $$$1$$$ and $$$2$$$, so the sponsors can always make player $$$2$$$ wins.The tournament grid from the second example is shown in the picture in the statement."}, "src_uid": "dc7b887afcc2e95c4e90619ceda63071"}
{"nl": {"description": "Polycarpus likes giving presents to Paraskevi. He has bought two chocolate bars, each of them has the shape of a segmented rectangle. The first bar is a1\u2009\u00d7\u2009b1 segments large and the second one is a2\u2009\u00d7\u2009b2 segments large.Polycarpus wants to give Paraskevi one of the bars at the lunch break and eat the other one himself. Besides, he wants to show that Polycarpus's mind and Paraskevi's beauty are equally matched, so the two bars must have the same number of squares.To make the bars have the same number of squares, Polycarpus eats a little piece of chocolate each minute. Each minute he does the following:  he either breaks one bar exactly in half (vertically or horizontally) and eats exactly a half of the bar,  or he chips of exactly one third of a bar (vertically or horizontally) and eats exactly a third of the bar. In the first case he is left with a half, of the bar and in the second case he is left with two thirds of the bar.Both variants aren't always possible, and sometimes Polycarpus cannot chip off a half nor a third. For example, if the bar is 16\u2009\u00d7\u200923, then Polycarpus can chip off a half, but not a third. If the bar is 20\u2009\u00d7\u200918, then Polycarpus can chip off both a half and a third. If the bar is 5\u2009\u00d7\u20097, then Polycarpus cannot chip off a half nor a third.What is the minimum number of minutes Polycarpus needs to make two bars consist of the same number of squares? Find not only the required minimum number of minutes, but also the possible sizes of the bars after the process.", "input_spec": "The first line of the input contains integers a1,\u2009b1 (1\u2009\u2264\u2009a1,\u2009b1\u2009\u2264\u2009109) \u2014 the initial sizes of the first chocolate bar. The second line of the input contains integers a2,\u2009b2 (1\u2009\u2264\u2009a2,\u2009b2\u2009\u2264\u2009109) \u2014 the initial sizes of the second bar. You can use the data of type int64 (in Pascal), long long (in \u0421++), long (in Java) to process large integers (exceeding 231\u2009-\u20091).", "output_spec": "In the first line print m \u2014 the sought minimum number of minutes. In the second and third line print the possible sizes of the bars after they are leveled in m minutes. Print the sizes using the format identical to the input format. Print the sizes (the numbers in the printed pairs) in any order. The second line must correspond to the first bar and the third line must correspond to the second bar. If there are multiple solutions, print any of them. If there is no solution, print a single line with integer -1.", "sample_inputs": ["2 6\n2 3", "36 5\n10 16", "3 5\n2 1"], "sample_outputs": ["1\n1 6\n2 3", "3\n16 5\n5 16", "-1"], "notes": null}, "src_uid": "4fcd8c4955a47661462c326cbb3429bd"}
{"nl": {"description": "Natasha's favourite numbers are $$$n$$$ and $$$1$$$, and Sasha's favourite numbers are $$$m$$$ and $$$-1$$$. One day Natasha and Sasha met and wrote down every possible array of length $$$n+m$$$ such that some $$$n$$$ of its elements are equal to $$$1$$$ and another $$$m$$$ elements are equal to $$$-1$$$. For each such array they counted its maximal prefix sum, probably an empty one which is equal to $$$0$$$ (in another words, if every nonempty prefix sum is less to zero, then it is considered equal to zero). Formally, denote as $$$f(a)$$$ the maximal prefix sum of an array $$$a_{1, \\ldots ,l}$$$ of length $$$l \\geq 0$$$. Then: $$$$$$f(a) = \\max (0, \\smash{\\displaystyle\\max_{1 \\leq i \\leq l}} \\sum_{j=1}^{i} a_j )$$$$$$Now they want to count the sum of maximal prefix sums for each such an array and they are asking you to help. As this sum can be very large, output it modulo $$$998\\: 244\\: 853$$$.", "input_spec": "The only line contains two integers $$$n$$$ and $$$m$$$ ($$$0 \\le n,m \\le 2\\,000$$$).", "output_spec": "Output the answer to the problem modulo $$$998\\: 244\\: 853$$$.", "sample_inputs": ["0 2", "2 0", "2 2", "2000 2000"], "sample_outputs": ["0", "2", "5", "674532367"], "notes": "NoteIn the first example the only possible array is [-1,-1], its maximal prefix sum is equal to $$$0$$$. In the second example the only possible array is [1,1], its maximal prefix sum is equal to $$$2$$$. There are $$$6$$$ possible arrays in the third example:[1,1,-1,-1], f([1,1,-1,-1]) = 2[1,-1,1,-1], f([1,-1,1,-1]) = 1[1,-1,-1,1], f([1,-1,-1,1]) = 1[-1,1,1,-1], f([-1,1,1,-1]) = 1[-1,1,-1,1], f([-1,1,-1,1]) = 0[-1,-1,1,1], f([-1,-1,1,1]) = 0So the answer for the third example is $$$2+1+1+1+0+0 = 5$$$."}, "src_uid": "a2fcad987e9b2bb3e6395654cd4fcfbb"}
{"nl": {"description": "Let's introduce some definitions that will be needed later.Let $$$prime(x)$$$ be the set of prime divisors of $$$x$$$. For example, $$$prime(140) = \\{ 2, 5, 7 \\}$$$, $$$prime(169) = \\{ 13 \\}$$$.Let $$$g(x, p)$$$ be the maximum possible integer $$$p^k$$$ where $$$k$$$ is an integer such that $$$x$$$ is divisible by $$$p^k$$$. For example:  $$$g(45, 3) = 9$$$ ($$$45$$$ is divisible by $$$3^2=9$$$ but not divisible by $$$3^3=27$$$),  $$$g(63, 7) = 7$$$ ($$$63$$$ is divisible by $$$7^1=7$$$ but not divisible by $$$7^2=49$$$). Let $$$f(x, y)$$$ be the product of $$$g(y, p)$$$ for all $$$p$$$ in $$$prime(x)$$$. For example:  $$$f(30, 70) = g(70, 2) \\cdot g(70, 3) \\cdot g(70, 5) = 2^1 \\cdot 3^0 \\cdot 5^1 = 10$$$,  $$$f(525, 63) = g(63, 3) \\cdot g(63, 5) \\cdot g(63, 7) = 3^2 \\cdot 5^0 \\cdot 7^1 = 63$$$. You have integers $$$x$$$ and $$$n$$$. Calculate $$$f(x, 1) \\cdot f(x, 2) \\cdot \\ldots \\cdot f(x, n) \\bmod{(10^{9} + 7)}$$$.", "input_spec": "The only line contains integers $$$x$$$ and $$$n$$$ ($$$2 \\le x \\le 10^{9}$$$, $$$1 \\le n \\le 10^{18}$$$)\u00a0\u2014 the numbers used in formula.", "output_spec": "Print the answer.", "sample_inputs": ["10 2", "20190929 1605", "947 987654321987654321"], "sample_outputs": ["2", "363165664", "593574252"], "notes": "NoteIn the first example, $$$f(10, 1) = g(1, 2) \\cdot g(1, 5) = 1$$$, $$$f(10, 2) = g(2, 2) \\cdot g(2, 5) = 2$$$.In the second example, actual value of formula is approximately $$$1.597 \\cdot 10^{171}$$$. Make sure you print the answer modulo $$$(10^{9} + 7)$$$.In the third example, be careful about overflow issue."}, "src_uid": "04610fbaa746c083dda30e21fa6e1a0c"}
{"nl": {"description": "Have you ever tried to explain to the coordinator, why it is eight hours to the contest and not a single problem has been prepared yet? Misha had. And this time he has a really strong excuse: he faced a space-time paradox! Space and time replaced each other.The entire universe turned into an enormous clock face with three hands\u00a0\u2014 hour, minute, and second. Time froze, and clocks now show the time h hours, m minutes, s seconds.Last time Misha talked with the coordinator at t1 o'clock, so now he stands on the number t1 on the clock face. The contest should be ready by t2 o'clock. In the terms of paradox it means that Misha has to go to number t2 somehow. Note that he doesn't have to move forward only: in these circumstances time has no direction.Clock hands are very long, and Misha cannot get round them. He also cannot step over as it leads to the collapse of space-time. That is, if hour clock points 12 and Misha stands at 11 then he cannot move to 1 along the top arc. He has to follow all the way round the clock center (of course, if there are no other hands on his way).Given the hands' positions, t1, and t2, find if Misha can prepare the contest on time (or should we say on space?). That is, find if he can move from t1 to t2 by the clock face.", "input_spec": "Five integers h, m, s, t1, t2 (1\u2009\u2264\u2009h\u2009\u2264\u200912, 0\u2009\u2264\u2009m,\u2009s\u2009\u2264\u200959, 1\u2009\u2264\u2009t1,\u2009t2\u2009\u2264\u200912, t1\u2009\u2260\u2009t2). Misha's position and the target time do not coincide with the position of any hand.", "output_spec": "Print \"YES\" (quotes for clarity), if Misha can prepare the contest on time, and \"NO\" otherwise. You can print each character either upper- or lowercase (\"YeS\" and \"yes\" are valid when the answer is \"YES\").", "sample_inputs": ["12 30 45 3 11", "12 0 1 12 1", "3 47 0 4 9"], "sample_outputs": ["NO", "YES", "YES"], "notes": "NoteThe three examples are shown on the pictures below from left to right. The starting position of Misha is shown with green, the ending position is shown with pink. Note that the positions of the hands on the pictures are not exact, but are close to the exact and the answer is the same.  "}, "src_uid": "912c8f557a976bdedda728ba9f916c95"}
{"nl": {"description": "The King of Flatland will organize a knights' tournament! The winner will get half the kingdom and the favor of the princess of legendary beauty and wisdom. The final test of the applicants' courage and strength will be a fencing tournament. The tournament is held by the following rules: the participants fight one on one, the winner (or rather, the survivor) transfers to the next round.Before the battle both participants stand at the specified points on the Ox axis with integer coordinates. Then they make moves in turn. The first participant moves first, naturally. During a move, the first participant can transfer from the point x to any integer point of the interval [x\u2009+\u2009a; x\u2009+\u2009b]. The second participant can transfer during a move to any integer point of the interval [x\u2009-\u2009b; x\u2009-\u2009a]. That is, the options for the players' moves are symmetric (note that the numbers a and b are not required to be positive, and if a\u2009\u2264\u20090\u2009\u2264\u2009b, then staying in one place is a correct move). At any time the participants can be located arbitrarily relative to each other, that is, it is allowed to \"jump\" over the enemy in any direction. A participant wins if he uses his move to transfer to the point where his opponent is.Of course, the princess has already chosen a husband and now she wants to make her sweetheart win the tournament. He has already reached the tournament finals and he is facing the last battle. The princess asks the tournament manager to arrange the tournament finalists in such a way that her sweetheart wins the tournament, considering that both players play optimally. However, the initial location of the participants has already been announced, and we can only pull some strings and determine which participant will be first and which one will be second. But how do we know which participant can secure the victory? Alas, the princess is not learned in the military affairs... Therefore, she asks you to determine how the battle will end considering that both opponents play optimally. Also, if the first player wins, your task is to determine his winning move.", "input_spec": "The first line contains four space-separated integers \u2014 x1, x2, a and b (x1\u2009\u2260\u2009x2, a\u2009\u2264\u2009b, \u2009-\u2009109\u2009\u2264\u2009x1,\u2009x2,\u2009a,\u2009b\u2009\u2264\u2009109) \u2014 coordinates of the points where the first and the second participant start, and the numbers that determine the players' moves, correspondingly.", "output_spec": "On the first line print the outcome of the battle as \"FIRST\" (without the quotes), if both players play optimally and the first player wins. Print \"SECOND\" (without the quotes) if the second player wins and print \"DRAW\" (without the quotes), if nobody is able to secure the victory. If the first player wins, print on the next line the single integer x \u2014 the coordinate of the point where the first player should transfer to win. The indicated move should be valid, that is, it should meet the following condition: x1\u2009+\u2009a\u2009\u2264\u2009x\u2009\u2264\u2009x1\u2009+\u2009b. If there are several winning moves, print any of them. If the first participant can't secure the victory, then you do not have to print anything.", "sample_inputs": ["0 2 0 4", "0 2 1 1", "0 2 0 1"], "sample_outputs": ["FIRST\n2", "SECOND", "DRAW"], "notes": "NoteIn the first sample the first player can win in one move.In the second sample the first participant must go to point 1, where the second participant immediately goes and wins. In the third sample changing the position isn't profitable to either participant, so nobody wins."}, "src_uid": "4ea8cc3305a0ee2c1e580b43e5bc46c6"}
{"nl": {"description": "Two participants are each given a pair of distinct numbers from 1 to 9 such that there's exactly one number that is present in both pairs. They want to figure out the number that matches by using a communication channel you have access to without revealing it to you.Both participants communicated to each other a set of pairs of numbers, that includes the pair given to them. Each pair in the communicated sets comprises two different numbers.Determine if you can with certainty deduce the common number, or if you can determine with certainty that both participants know the number but you do not.", "input_spec": "The first line contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n, m \\le 12$$$) \u2014 the number of pairs the first participant communicated to the second and vice versa. The second line contains $$$n$$$ pairs of integers, each between $$$1$$$ and $$$9$$$, \u2014 pairs of numbers communicated from first participant to the second. The third line contains $$$m$$$ pairs of integers, each between $$$1$$$ and $$$9$$$, \u2014 pairs of numbers communicated from the second participant to the first. All pairs within each set are distinct (in particular, if there is a pair $$$(1,2)$$$, there will be no pair $$$(2,1)$$$ within the same set), and no pair contains the same number twice. It is guaranteed that the two sets do not contradict the statements, in other words, there is pair from the first set and a pair from the second set that share exactly one number.", "output_spec": "If you can deduce the shared number with certainty, print that number. If you can with certainty deduce that both participants know the shared number, but you do not know it, print $$$0$$$. Otherwise print $$$-1$$$.", "sample_inputs": ["2 2\n1 2 3 4\n1 5 3 4", "2 2\n1 2 3 4\n1 5 6 4", "2 3\n1 2 4 5\n1 2 1 3 2 3"], "sample_outputs": ["1", "0", "-1"], "notes": "NoteIn the first example the first participant communicated pairs $$$(1,2)$$$ and $$$(3,4)$$$, and the second communicated $$$(1,5)$$$, $$$(3,4)$$$. Since we know that the actual pairs they received share exactly one number, it can't be that they both have $$$(3,4)$$$. Thus, the first participant has $$$(1,2)$$$ and the second has $$$(1,5)$$$, and at this point you already know the shared number is $$$1$$$.In the second example either the first participant has $$$(1,2)$$$ and the second has $$$(1,5)$$$, or the first has $$$(3,4)$$$ and the second has $$$(6,4)$$$. In the first case both of them know the shared number is $$$1$$$, in the second case both of them know the shared number is $$$4$$$. You don't have enough information to tell $$$1$$$ and $$$4$$$ apart.In the third case if the first participant was given $$$(1,2)$$$, they don't know what the shared number is, since from their perspective the second participant might have been given either $$$(1,3)$$$, in which case the shared number is $$$1$$$, or $$$(2,3)$$$, in which case the shared number is $$$2$$$. While the second participant does know the number with certainty, neither you nor the first participant do, so the output is $$$-1$$$."}, "src_uid": "cb4de190ae26127df6eeb7a1a1db8a6d"}
{"nl": {"description": "Once Volodya was at the museum and saw a regular chessboard as a museum piece. And there were only four chess pieces on it: two white rooks, a white king and a black king. \"Aha, blacks certainly didn't win!\", \u2014 Volodya said and was right for sure. And your task is to say whether whites had won or not.Pieces on the chessboard are guaranteed to represent a correct position (every piece occupies one cell, no two pieces occupy the same cell and kings cannot take each other). Thus, your task is only to decide whether whites mate blacks. We would remind you that it means that the black king can be taken by one of the opponent's pieces at the moment and also it cannot move to an unbeaten position. A rook moves vertically or horizontally by any number of free cells (assuming there are no other pieces on its path), a king \u2014 to the adjacent cells (either by corner or by side). Certainly, pieces cannot leave the board. The black king might be able to take opponent's rooks at his turn (see sample 3).", "input_spec": "The input contains 4 space-separated piece positions: positions of the two rooks, the white king and the black king. Each position on 8\u2009\u00d7\u20098 chessboard is denoted by two symbols \u2014 ('a' - 'h') and ('1' - '8') \u2014 which stand for horizontal and vertical coordinates of the cell occupied by the piece. It is guaranteed, that no two pieces occupy the same cell, and kings cannot take each other.", "output_spec": "Output should contain one word: \"CHECKMATE\" if whites mate blacks, and \"OTHER\" otherwise.", "sample_inputs": ["a6 b4 c8 a8", "a6 c4 b6 b8", "a2 b1 a3 a1"], "sample_outputs": ["CHECKMATE", "OTHER", "OTHER"], "notes": null}, "src_uid": "5d05af36c7ccb0cd26a4ab45966b28a3"}
{"nl": {"description": "Qwerty the Ranger took up a government job and arrived on planet Mars. He should stay in the secret lab and conduct some experiments on bacteria that have funny and abnormal properties. The job isn't difficult, but the salary is high.At the beginning of the first experiment there is a single bacterium in the test tube. Every second each bacterium in the test tube divides itself into k bacteria. After that some abnormal effects create b more bacteria in the test tube. Thus, if at the beginning of some second the test tube had x bacteria, then at the end of the second it will have kx\u2009+\u2009b bacteria.The experiment showed that after n seconds there were exactly z bacteria and the experiment ended at this point.For the second experiment Qwerty is going to sterilize the test tube and put there t bacteria. He hasn't started the experiment yet but he already wonders, how many seconds he will need to grow at least z bacteria. The ranger thinks that the bacteria will divide by the same rule as in the first experiment. Help Qwerty and find the minimum number of seconds needed to get a tube with at least z bacteria in the second experiment.", "input_spec": "The first line contains four space-separated integers k, b, n and t (1\u2009\u2264\u2009k,\u2009b,\u2009n,\u2009t\u2009\u2264\u2009106) \u2014 the parameters of bacterial growth, the time Qwerty needed to grow z bacteria in the first experiment and the initial number of bacteria in the second experiment, correspondingly.", "output_spec": "Print a single number \u2014 the minimum number of seconds Qwerty needs to grow at least z bacteria in the tube.", "sample_inputs": ["3 1 3 5", "1 4 4 7", "2 2 4 100"], "sample_outputs": ["2", "3", "0"], "notes": null}, "src_uid": "e2357a1f54757bce77dce625772e4f18"}
{"nl": {"description": "One day a highly important task was commissioned to Vasya \u2014 writing a program in a night. The program consists of n lines of code. Vasya is already exhausted, so he works like that: first he writes v lines of code, drinks a cup of tea, then he writes as much as  lines, drinks another cup of tea, then he writes  lines and so on: , , , ...The expression  is regarded as the integral part from dividing number a by number b.The moment the current value  equals 0, Vasya immediately falls asleep and he wakes up only in the morning, when the program should already be finished.Vasya is wondering, what minimum allowable value v can take to let him write not less than n lines of code before he falls asleep.", "input_spec": "The input consists of two integers n and k, separated by spaces \u2014 the size of the program in lines and the productivity reduction coefficient, 1\u2009\u2264\u2009n\u2009\u2264\u2009109, 2\u2009\u2264\u2009k\u2009\u2264\u200910.", "output_spec": "Print the only integer \u2014 the minimum value of v that lets Vasya write the program in one night.", "sample_inputs": ["7 2", "59 9"], "sample_outputs": ["4", "54"], "notes": "NoteIn the first sample the answer is v\u2009=\u20094. Vasya writes the code in the following portions: first 4 lines, then 2, then 1, and then Vasya falls asleep. Thus, he manages to write 4\u2009+\u20092\u2009+\u20091\u2009=\u20097 lines in a night and complete the task.In the second sample the answer is v\u2009=\u200954. Vasya writes the code in the following portions: 54, 6. The total sum is 54\u2009+\u20096\u2009=\u200960, that's even more than n\u2009=\u200959."}, "src_uid": "41dfc86d341082dd96e089ac5433dc04"}
{"nl": {"description": "Small, but very brave, mouse Brain was not accepted to summer school of young villains. He was upset and decided to postpone his plans of taking over the world, but to become a photographer instead.As you may know, the coolest photos are on the film (because you can specify the hashtag #film for such).Brain took a lot of colourful pictures on colored and black-and-white film. Then he developed and translated it into a digital form. But now, color and black-and-white photos are in one folder, and to sort them, one needs to spend more than one hour!As soon as Brain is a photographer not programmer now, he asks you to help him determine for a single photo whether it is colored or black-and-white.Photo can be represented as a matrix sized n\u2009\u00d7\u2009m, and each element of the matrix stores a symbol indicating corresponding pixel color. There are only 6 colors:   'C' (cyan) 'M' (magenta) 'Y' (yellow) 'W' (white) 'G' (grey) 'B' (black) The photo is considered black-and-white if it has only white, black and grey pixels in it. If there are any of cyan, magenta or yellow pixels in the photo then it is considered colored.", "input_spec": "The first line of the input contains two integers n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100)\u00a0\u2014 the number of photo pixel matrix rows and columns respectively. Then n lines describing matrix rows follow. Each of them contains m space-separated characters describing colors of pixels in a row. Each character in the line is one of the 'C', 'M', 'Y', 'W', 'G' or 'B'.", "output_spec": "Print the \"#Black&White\" (without quotes), if the photo is black-and-white and \"#Color\" (without quotes), if it is colored, in the only line.", "sample_inputs": ["2 2\nC M\nY Y", "3 2\nW W\nW W\nB B", "1 1\nW"], "sample_outputs": ["#Color", "#Black&White", "#Black&White"], "notes": null}, "src_uid": "19c311c02380f9a73cd477e4fde27454"}
{"nl": {"description": "There is a sequence of colorful stones. The color of each stone is one of red, green, or blue. You are given a string s. The i-th (1-based) character of s represents the color of the i-th stone. If the character is \"R\", \"G\", or \"B\", the color of the corresponding stone is red, green, or blue, respectively.Initially Squirrel Liss is standing on the first stone. You perform instructions one or more times.Each instruction is one of the three types: \"RED\", \"GREEN\", or \"BLUE\". After an instruction c, if Liss is standing on a stone whose colors is c, Liss will move one stone forward, else she will not move.You are given a string t. The number of instructions is equal to the length of t, and the i-th character of t represents the i-th instruction.Calculate the final position of Liss (the number of the stone she is going to stand on in the end) after performing all the instructions, and print its 1-based position. It is guaranteed that Liss don't move out of the sequence.", "input_spec": "The input contains two lines. The first line contains the string s (1\u2009\u2264\u2009|s|\u2009\u2264\u200950). The second line contains the string t (1\u2009\u2264\u2009|t|\u2009\u2264\u200950). The characters of each string will be one of \"R\", \"G\", or \"B\". It is guaranteed that Liss don't move out of the sequence.", "output_spec": "Print the final 1-based position of Liss in a single line.", "sample_inputs": ["RGB\nRRR", "RRRBGBRBBB\nBBBRR", "BRRBGBRGRBGRGRRGGBGBGBRGBRGRGGGRBRRRBRBBBGRRRGGBBB\nBBRBGGRGRGBBBRBGRBRBBBBRBRRRBGBBGBBRRBBGGRBRRBRGRB"], "sample_outputs": ["2", "3", "15"], "notes": null}, "src_uid": "f5a907d6d35390b1fb11c8ce247d0252"}
{"nl": {"description": "Luba has to do n chores today. i-th chore takes ai units of time to complete. It is guaranteed that for every  the condition ai\u2009\u2265\u2009ai\u2009-\u20091 is met, so the sequence is sorted.Also Luba can work really hard on some chores. She can choose not more than k any chores and do each of them in x units of time instead of ai ().Luba is very responsible, so she has to do all n chores, and now she wants to know the minimum time she needs to do everything. Luba cannot do two chores simultaneously.", "input_spec": "The first line contains three integers n,\u2009k,\u2009x\u00a0(1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u2009100,\u20091\u2009\u2264\u2009x\u2009\u2264\u200999) \u2014 the number of chores Luba has to do, the number of chores she can do in x units of time, and the number x itself. The second line contains n integer numbers ai\u00a0(2\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 the time Luba has to spend to do i-th chore. It is guaranteed that , and for each  ai\u2009\u2265\u2009ai\u2009-\u20091.", "output_spec": "Print one number \u2014 minimum time Luba needs to do all n chores.", "sample_inputs": ["4 2 2\n3 6 7 10", "5 2 1\n100 100 100 100 100"], "sample_outputs": ["13", "302"], "notes": "NoteIn the first example the best option would be to do the third and the fourth chore, spending x\u2009=\u20092 time on each instead of a3 and a4, respectively. Then the answer is 3\u2009+\u20096\u2009+\u20092\u2009+\u20092\u2009=\u200913.In the second example Luba can choose any two chores to spend x time on them instead of ai. So the answer is 100\u00b73\u2009+\u20092\u00b71\u2009=\u2009302."}, "src_uid": "92a233f8d9c73d9f33e4e6116b7d0a96"}
{"nl": {"description": "Those days, many boys use beautiful girls' photos as avatars in forums. So it is pretty hard to tell the gender of a user at the first glance. Last year, our hero went to a forum and had a nice chat with a beauty (he thought so). After that they talked very often and eventually they became a couple in the network. But yesterday, he came to see \"her\" in the real world and found out \"she\" is actually a very strong man! Our hero is very sad and he is too tired to love again now. So he came up with a way to recognize users' genders by their user names.This is his method: if the number of distinct characters in one's user name is odd, then he is a male, otherwise she is a female. You are given the string that denotes the user name, please help our hero to determine the gender of this user by his method.", "input_spec": "The first line contains a non-empty string, that contains only lowercase English letters \u2014 the user name. This string contains at most 100 letters.", "output_spec": "If it is a female by our hero's method, print \"CHAT WITH HER!\" (without the quotes), otherwise, print \"IGNORE HIM!\" (without the quotes).", "sample_inputs": ["wjmzbmr", "xiaodao", "sevenkplus"], "sample_outputs": ["CHAT WITH HER!", "IGNORE HIM!", "CHAT WITH HER!"], "notes": "NoteFor the first example. There are 6 distinct characters in \"wjmzbmr\". These characters are: \"w\", \"j\", \"m\", \"z\", \"b\", \"r\". So wjmzbmr is a female and you should print \"CHAT WITH HER!\"."}, "src_uid": "a8c14667b94b40da087501fd4bdd7818"}
{"nl": {"description": "Shaass thinks a kitchen with all white floor tiles is so boring. His kitchen floor is made of n\u00b7m square tiles forming a n\u2009\u00d7\u2009m rectangle. Therefore he's decided to color some of the tiles in black so that the floor looks like a checkerboard, which is no two side-adjacent tiles should have the same color.Shaass wants to use a painter robot to color the tiles. In the beginning the robot is standing in a border tile (xs,\u2009ys) facing a diagonal direction (i.e. upper-left, upper-right, down-left or down-right). As the robot walks in the kitchen he paints every tile he passes even if it's painted before. Painting each tile consumes one unit of black paint. If at any moment the robot hits a wall of the kitchen he changes his direction according the reflection rules. Note that a tile gets painted when the robot enters the tile from another tile, in other words changing direction in the same tile doesn't lead to any painting. The first tile the robot is standing on, is also painted.The robot stops painting the first moment the floor is checkered. Given the dimensions of the kitchen and the position of the robot, find out the amount of paint the robot consumes before it stops painting the floor.Let's consider an examples depicted below.  If the robot starts at tile number 1 (the tile (1,\u20091)) of the left grid heading to down-right it'll pass tiles 1354236 and consumes 7 units of black paint on his way until he stops at tile number 6. But if it starts at tile number 1 in the right grid heading to down-right it will get stuck in a loop painting tiles 1, 2, and 3.", "input_spec": "The first line of the input contains two integers n and m, (2\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009105). The second line contains two integers xs and ys (1\u2009\u2264\u2009xs\u2009\u2264\u2009n,\u20091\u2009\u2264\u2009ys\u2009\u2264\u2009m) and the direction robot is facing initially. Direction is one of the strings: \"UL\" (upper-left direction), \"UR\" (upper-right), \"DL\" (down-left) or \"DR\" (down-right). Note, that record (xs,\u2009ys) denotes the tile that is located at the xs-th row from the top and at the ys-th column from the left of the kitchen. It's guaranteed that the starting position will be a border tile (a tile with less than four side-adjacent tiles).", "output_spec": "Print the amount of paint the robot consumes to obtain a checkered kitchen floor. Or print -1 if it never happens. Please do not use the %lld specificator to read or write 64-bit integers in \u0421++. It is preferred to use the cin, cout streams or the %I64d specificator.", "sample_inputs": ["3 4\n1 1 DR", "3 4\n3 3 DR", "3 3\n1 1 DR", "3 3\n1 2 DL"], "sample_outputs": ["7", "11", "-1", "4"], "notes": null}, "src_uid": "8a59247013a9b1f34700f4bfc7d1831d"}
{"nl": {"description": "n children are standing in a circle and playing a game. Children's numbers in clockwise order form a permutation a1,\u2009a2,\u2009...,\u2009an of length n. It is an integer sequence such that each integer from 1 to n appears exactly once in it.The game consists of m steps. On each step the current leader with index i counts out ai people in clockwise order, starting from the next person. The last one to be pointed at by the leader becomes the new leader.You are given numbers l1,\u2009l2,\u2009...,\u2009lm \u2014 indices of leaders in the beginning of each step. Child with number l1 is the first leader in the game. Write a program which will restore a possible permutation a1,\u2009a2,\u2009...,\u2009an. If there are multiple solutions then print any of them. If there is no solution then print -1.", "input_spec": "The first line contains two integer numbers n, m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100). The second line contains m integer numbers l1,\u2009l2,\u2009...,\u2009lm (1\u2009\u2264\u2009li\u2009\u2264\u2009n) \u2014 indices of leaders in the beginning of each step.", "output_spec": "Print such permutation of n numbers a1,\u2009a2,\u2009...,\u2009an that leaders in the game will be exactly l1,\u2009l2,\u2009...,\u2009lm if all the rules are followed. If there are multiple solutions print any of them.  If there is no permutation which satisfies all described conditions print -1.", "sample_inputs": ["4 5\n2 3 1 4 4", "3 3\n3 1 2"], "sample_outputs": ["3 1 2 4", "-1"], "notes": "NoteLet's follow leadership in the first example:   Child 2 starts.  Leadership goes from 2 to 2\u2009+\u2009a2\u2009=\u20093.  Leadership goes from 3 to 3\u2009+\u2009a3\u2009=\u20095. As it's greater than 4, it's going in a circle to 1.  Leadership goes from 1 to 1\u2009+\u2009a1\u2009=\u20094.  Leadership goes from 4 to 4\u2009+\u2009a4\u2009=\u20098. Thus in circle it still remains at 4. "}, "src_uid": "4a7c959ca279d0a9bd9bbf0ce88cf72b"}
{"nl": {"description": "Given an integer $$$x$$$. Your task is to find out how many positive integers $$$n$$$ ($$$1 \\leq n \\leq x$$$) satisfy $$$$$$n \\cdot a^n \\equiv b \\quad (\\textrm{mod}\\;p),$$$$$$ where $$$a, b, p$$$ are all known constants.", "input_spec": "The only line contains four integers $$$a,b,p,x$$$ ($$$2 \\leq p \\leq 10^6+3$$$, $$$1 \\leq a,b < p$$$, $$$1 \\leq x \\leq 10^{12}$$$). It is guaranteed that $$$p$$$ is a prime.", "output_spec": "Print a single integer: the number of possible answers $$$n$$$.", "sample_inputs": ["2 3 5 8", "4 6 7 13", "233 233 10007 1"], "sample_outputs": ["2", "1", "1"], "notes": "NoteIn the first sample, we can see that $$$n=2$$$ and $$$n=8$$$ are possible answers."}, "src_uid": "4b9f470e5889da29affae6376f6c9f6a"}
{"nl": {"description": "Little Sofia is in fourth grade. Today in the geometry lesson she learned about segments and squares. On the way home, she decided to draw $$$n$$$ squares in the snow with a side length of $$$1$$$. For simplicity, we assume that Sofia lives on a plane and can draw only segments of length $$$1$$$, parallel to the coordinate axes, with vertices at integer points.In order to draw a segment, Sofia proceeds as follows. If she wants to draw a vertical segment with the coordinates of the ends $$$(x, y)$$$ and $$$(x, y+1)$$$. Then Sofia looks if there is already a drawn segment with the coordinates of the ends $$$(x', y)$$$ and $$$(x', y+1)$$$ for some $$$x'$$$. If such a segment exists, then Sofia quickly draws a new segment, using the old one as a guideline. If there is no such segment, then Sofia has to take a ruler and measure a new segment for a long time. Same thing happens when Sofia wants to draw a horizontal segment, but only now she checks for the existence of a segment with the same coordinates $$$x$$$, $$$x+1$$$ and the differing coordinate $$$y$$$.For example, if Sofia needs to draw one square, she will have to draw two segments using a ruler:   After that, she can draw the remaining two segments, using the first two as a guide:   If Sofia needs to draw two squares, she will have to draw three segments using a ruler:   After that, she can draw the remaining four segments, using the first three as a guide:   Sofia is in a hurry, so she wants to minimize the number of segments that she will have to draw with a ruler without a guide. Help her find this minimum number.", "input_spec": "The only line of input contains a single integer $$$n$$$ ($$$1 \\le n \\le 10^{9}$$$), the number of squares that Sofia wants to draw.", "output_spec": "Print single integer, the minimum number of segments that Sofia will have to draw with a ruler without a guide in order to draw $$$n$$$ squares in the manner described above.", "sample_inputs": ["1", "2", "4"], "sample_outputs": ["2", "3", "4"], "notes": null}, "src_uid": "eb8212aec951f8f69b084446da73eaf7"}
{"nl": {"description": "The elections to Berland parliament are happening today. Voting is in full swing!Totally there are n candidates, they are numbered from 1 to n. Based on election results k (1\u2009\u2264\u2009k\u2009\u2264\u2009n) top candidates will take seats in the parliament.After the end of the voting the number of votes for each candidate is calculated. In the resulting table the candidates are ordered by the number of votes. In case of tie (equal number of votes) they are ordered by the time of the last vote given. The candidate with ealier last vote stands higher in the resulting table.So in the resulting table candidates are sorted by the number of votes (more votes stand for the higher place) and if two candidates have equal number of votes they are sorted by the time of last vote (earlier last vote stands for the higher place).There is no way for a candidate with zero votes to take a seat in the parliament. So it is possible that less than k candidates will take a seat in the parliament.In Berland there are m citizens who can vote. Each of them will vote for some candidate. Each citizen will give a vote to exactly one of n candidates. There is no option \"against everyone\" on the elections. It is not accepted to spoil bulletins or not to go to elections. So each of m citizens will vote for exactly one of n candidates.At the moment a citizens have voted already (1\u2009\u2264\u2009a\u2009\u2264\u2009m). This is an open election, so for each citizen it is known the candidate for which the citizen has voted. Formally, the j-th citizen voted for the candidate gj. The citizens who already voted are numbered in chronological order; i.e. the (j\u2009+\u20091)-th citizen voted after the j-th.The remaining m\u2009-\u2009a citizens will vote before the end of elections, each of them will vote for one of n candidates.Your task is to determine for each of n candidates one of the three possible outcomes:  a candidate will be elected to the parliament regardless of votes of the remaining m\u2009-\u2009a citizens;  a candidate has chance to be elected to the parliament after all n citizens have voted;  a candidate has no chances to be elected to the parliament regardless of votes of the remaining m\u2009-\u2009a citizens. ", "input_spec": "The first line contains four integers n, k, m and a (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u2009100, 1\u2009\u2264\u2009m\u2009\u2264\u2009100, 1\u2009\u2264\u2009a\u2009\u2264\u2009m) \u2014 the number of candidates, the number of seats in the parliament, the number of Berland citizens and the number of citizens who already have voted. The second line contains a sequence of a integers g1,\u2009g2,\u2009...,\u2009ga (1\u2009\u2264\u2009gj\u2009\u2264\u2009n), where gj is the candidate for which the j-th citizen has voted. Citizens who already voted are numbered in increasing order of voting times.", "output_spec": "Print the sequence consisting of n integers r1,\u2009r2,\u2009...,\u2009rn where:   ri\u2009=\u20091 means that the i-th candidate is guaranteed to take seat in the parliament regardless of votes of the remaining m\u2009-\u2009a citizens;  ri\u2009=\u20092 means that the i-th candidate has a chance to take a seat in the parliament, i.e. the remaining m\u2009-\u2009a citizens can vote in such a way that the candidate will take a seat in the parliament;  ri\u2009=\u20093 means that the i-th candidate will not take a seat in the parliament regardless of votes of the remaining m\u2009-\u2009a citizens. ", "sample_inputs": ["3 1 5 4\n1 2 1 3", "3 1 5 3\n1 3 1", "3 2 5 3\n1 3 1"], "sample_outputs": ["1 3 3", "2 3 2", "1 2 2"], "notes": null}, "src_uid": "81a890bd542963bbcec7a041dde5c247"}
{"nl": {"description": "Berland Football Cup starts really soon! Commentators from all over the world come to the event.Organizers have already built $$$n$$$ commentary boxes. $$$m$$$ regional delegations will come to the Cup. Every delegation should get the same number of the commentary boxes. If any box is left unoccupied then the delegations will be upset. So each box should be occupied by exactly one delegation.If $$$n$$$ is not divisible by $$$m$$$, it is impossible to distribute the boxes to the delegations at the moment.Organizers can build a new commentary box paying $$$a$$$ burles and demolish a commentary box paying $$$b$$$ burles. They can both build and demolish boxes arbitrary number of times (each time paying a corresponding fee). It is allowed to demolish all the existing boxes.What is the minimal amount of burles organizers should pay to satisfy all the delegations (i.e. to make the number of the boxes be divisible by $$$m$$$)?", "input_spec": "The only line contains four integer numbers $$$n$$$, $$$m$$$, $$$a$$$ and $$$b$$$ ($$$1 \\le n, m \\le 10^{12}$$$, $$$1 \\le a, b \\le 100$$$), where $$$n$$$ is the initial number of the commentary boxes, $$$m$$$ is the number of delegations to come, $$$a$$$ is the fee to build a box and $$$b$$$ is the fee to demolish a box.", "output_spec": "Output the minimal amount of burles organizers should pay to satisfy all the delegations (i.e. to make the number of the boxes be divisible by $$$m$$$). It is allowed that the final number of the boxes is equal to $$$0$$$.", "sample_inputs": ["9 7 3 8", "2 7 3 7", "30 6 17 19"], "sample_outputs": ["15", "14", "0"], "notes": "NoteIn the first example organizers can build $$$5$$$ boxes to make the total of $$$14$$$ paying $$$3$$$ burles for the each of them.In the second example organizers can demolish $$$2$$$ boxes to make the total of $$$0$$$ paying $$$7$$$ burles for the each of them.In the third example organizers are already able to distribute all the boxes equally among the delegations, each one get $$$5$$$ boxes."}, "src_uid": "c05d753b35545176ad468b99ff13aa39"}
{"nl": {"description": "Petr wants to make a calendar for current month. For this purpose he draws a table in which columns correspond to weeks (a week is seven consequent days from Monday to Sunday), rows correspond to weekdays, and cells contain dates. For example, a calendar for January 2017 should look like on the picture:  Petr wants to know how many columns his table should have given the month and the weekday of the first date of that month? Assume that the year is non-leap.", "input_spec": "The only line contain two integers m and d (1\u2009\u2264\u2009m\u2009\u2264\u200912, 1\u2009\u2264\u2009d\u2009\u2264\u20097)\u00a0\u2014 the number of month (January is the first month, December is the twelfth) and the weekday of the first date of this month (1 is Monday, 7 is Sunday).", "output_spec": "Print single integer: the number of columns the table should have.", "sample_inputs": ["1 7", "1 1", "11 6"], "sample_outputs": ["6", "5", "5"], "notes": "NoteThe first example corresponds to the January 2017 shown on the picture in the statements.In the second example 1-st January is Monday, so the whole month fits into 5 columns.In the third example 1-st November is Saturday and 5 columns is enough."}, "src_uid": "5b969b6f564df6f71e23d4adfb2ded74"}
{"nl": {"description": "Theatre Square in the capital city of Berland has a rectangular shape with the size n\u2009\u00d7\u2009m meters. On the occasion of the city's anniversary, a decision was taken to pave the Square with square granite flagstones. Each flagstone is of the size a\u2009\u00d7\u2009a.What is the least number of flagstones needed to pave the Square? It's allowed to cover the surface larger than the Theatre Square, but the Square has to be covered. It's not allowed to break the flagstones. The sides of flagstones should be parallel to the sides of the Square.", "input_spec": "The input contains three positive integer numbers in the first line: n,\u2009\u2009m and a (1\u2009\u2264\u2009\u2009n,\u2009m,\u2009a\u2009\u2264\u2009109).", "output_spec": "Write the needed number of flagstones.", "sample_inputs": ["6 6 4"], "sample_outputs": ["4"], "notes": null}, "src_uid": "ef971874d8c4da37581336284b688517"}
{"nl": {"description": "The following problem is well-known: given integers n and m, calculate , where 2n\u2009=\u20092\u00b72\u00b7...\u00b72 (n factors), and  denotes the remainder of division of x by y.You are asked to solve the \"reverse\" problem. Given integers n and m, calculate . ", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009108). The second line contains a single integer m (1\u2009\u2264\u2009m\u2009\u2264\u2009108).", "output_spec": "Output a single integer\u00a0\u2014 the value of .", "sample_inputs": ["4\n42", "1\n58", "98765432\n23456789"], "sample_outputs": ["10", "0", "23456789"], "notes": "NoteIn the first example, the remainder of division of 42 by 24\u2009=\u200916 is equal to 10.In the second example, 58 is divisible by 21\u2009=\u20092 without remainder, and the answer is 0."}, "src_uid": "c649052b549126e600691931b512022f"}
{"nl": {"description": "Imp is watching a documentary about cave painting.  Some numbers, carved in chaotic order, immediately attracted his attention. Imp rapidly proposed a guess that they are the remainders of division of a number n by all integers i from 1 to k. Unfortunately, there are too many integers to analyze for Imp.Imp wants you to check whether all these remainders are distinct. Formally, he wants to check, if all , 1\u2009\u2264\u2009i\u2009\u2264\u2009k, are distinct, i.\u00a0e. there is no such pair (i,\u2009j) that:   1\u2009\u2264\u2009i\u2009<\u2009j\u2009\u2264\u2009k,  , where  is the remainder of division x by y. ", "input_spec": "The only line contains two integers n, k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u20091018).", "output_spec": "Print \"Yes\", if all the remainders are distinct, and \"No\" otherwise. You can print each letter in arbitrary case (lower or upper).", "sample_inputs": ["4 4", "5 3"], "sample_outputs": ["No", "Yes"], "notes": "NoteIn the first sample remainders modulo 1 and 4 coincide."}, "src_uid": "5271c707c9c72ef021a0baf762bf3eb2"}
{"nl": {"description": "Sergey is testing a next-generation processor. Instead of bytes the processor works with memory cells consisting of n bits. These bits are numbered from 1 to n. An integer is stored in the cell in the following way: the least significant bit is stored in the first bit of the cell, the next significant bit is stored in the second bit, and so on; the most significant bit is stored in the n-th bit.Now Sergey wants to test the following instruction: \"add 1 to the value of the cell\". As a result of the instruction, the integer that is written in the cell must be increased by one; if some of the most significant bits of the resulting number do not fit into the cell, they must be discarded.Sergey wrote certain values \u200b\u200bof the bits in the cell and is going to add one to its value. How many bits of the cell will change after the operation?", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of bits in the cell. The second line contains a string consisting of n characters \u2014 the initial state of the cell. The first character denotes the state of the first bit of the cell. The second character denotes the second least significant bit and so on. The last character denotes the state of the most significant bit.", "output_spec": "Print a single integer \u2014 the number of bits in the cell which change their state after we add 1 to the cell.", "sample_inputs": ["4\n1100", "4\n1111"], "sample_outputs": ["3", "4"], "notes": "NoteIn the first sample the cell ends up with value 0010, in the second sample \u2014 with 0000."}, "src_uid": "54cb2e987f2cc06c02c7638ea879a1ab"}
{"nl": {"description": "You won't find this sequence on OEIS.", "input_spec": "One integer $$$r$$$ ($$$-45 \\le r \\le 2999$$$).", "output_spec": "One integer.", "sample_inputs": ["2999"], "sample_outputs": ["3000"], "notes": null}, "src_uid": "22725effa6dc68b9c2a499d148e613c2"}
{"nl": {"description": "Polycarpus has recently got interested in sequences of pseudorandom numbers. He learned that many programming languages generate such sequences in a similar way:  (for i\u2009\u2265\u20091). Here a, b, m are constants, fixed for the given realization of the pseudorandom numbers generator, r0 is the so-called randseed (this value can be set from the program using functions like RandSeed(r) or srand(n)), and  denotes the operation of taking the remainder of division.For example, if a\u2009=\u20092,\u2009b\u2009=\u20096,\u2009m\u2009=\u200912,\u2009r0\u2009=\u200911, the generated sequence will be: 4,\u20092,\u200910,\u20092,\u200910,\u20092,\u200910,\u20092,\u200910,\u20092,\u200910,\u2009....Polycarpus realized that any such sequence will sooner or later form a cycle, but the cycle may occur not in the beginning, so there exist a preperiod and a period. The example above shows a preperiod equal to 1 and a period equal to 2.Your task is to find the period of a sequence defined by the given values of a,\u2009b,\u2009m and r0. Formally, you have to find such minimum positive integer t, for which exists such positive integer k, that for any i\u2009\u2265\u2009k: ri\u2009=\u2009ri\u2009+\u2009t.", "input_spec": "The single line of the input contains four integers a, b, m and r0 (1\u2009\u2264\u2009m\u2009\u2264\u2009105,\u20090\u2009\u2264\u2009a,\u2009b\u2009\u2264\u20091000,\u20090\u2009\u2264\u2009r0\u2009<\u2009m), separated by single spaces.", "output_spec": "Print a single integer \u2014 the period of the sequence.", "sample_inputs": ["2 6 12 11", "2 3 5 1", "3 6 81 9"], "sample_outputs": ["2", "4", "1"], "notes": "NoteThe first sample is described above. In the second sample the sequence is (starting from the first element): 0,\u20093,\u20094,\u20091,\u20090,\u20093,\u20094,\u20091,\u20090,\u2009...In the third sample the sequence is (starting from the first element): 33,\u200924,\u200978,\u200978,\u200978,\u200978,\u2009..."}, "src_uid": "9137197ee1b781cd5cc77c46f50b9012"}
{"nl": {"description": "Flatland is inhabited by pixels of three colors: red, green and blue. We know that if two pixels of different colors meet in a violent fight, only one of them survives the fight (that is, the total number of pixels decreases by one). Besides, if pixels of colors x and y (x\u2009\u2260\u2009y) meet in a violent fight, then the pixel that survives the fight immediately changes its color to z (z\u2009\u2260\u2009x;\u00a0z\u2009\u2260\u2009y). Pixels of the same color are friends, so they don't fight.The King of Flatland knows that his land will be peaceful and prosperous when the pixels are of the same color. For each of the three colors you know the number of pixels of this color that inhabit Flatland. Help the king and determine whether fights can bring peace and prosperity to the country and if it is possible, find the minimum number of fights needed to make the land peaceful and prosperous. ", "input_spec": "The first line contains three space-separated integers a, b and c (0\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u2009231;\u00a0a\u2009+\u2009b\u2009+\u2009c\u2009>\u20090) \u2014 the number of red, green and blue pixels, correspondingly.", "output_spec": "Print a single number \u2014 the minimum number of pixel fights before the country becomes peaceful and prosperous. If making the country peaceful and prosperous is impossible, print -1.", "sample_inputs": ["1 1 1", "3 1 0"], "sample_outputs": ["1", "3"], "notes": "NoteIn the first test sample the country needs only one fight to achieve peace and prosperity. Besides, it can be any fight whatsoever. For example, let's assume that the green and the blue pixels fight, then the surviving pixel will be red. As a result, after the fight there are two red pixels. There won't be other pixels.In the second sample the following sequence of fights is possible: red and blue, green and red, red and blue. As a result, after all fights there is one green pixel left."}, "src_uid": "b8008caf788336775cb8ebb76478b04c"}
{"nl": {"description": "Recall that a binary search tree is a rooted binary tree, whose nodes each store a key and each have at most two distinguished subtrees, left and right. The key in each node must be greater than any key stored in the left subtree, and less than any key stored in the right subtree.The depth of a vertex is the number of edges on the simple path from the vertex to the root. In particular, the depth of the root is $$$0$$$.Let's call a binary search tree perfectly balanced if there doesn't exist a binary search tree with the same number of vertices that has a strictly smaller sum of depths of its vertices.Let's call a binary search tree with integer keys striped if both of the following conditions are satisfied for every vertex $$$v$$$:   If $$$v$$$ has a left subtree whose root is $$$u$$$, then the parity of the key of $$$v$$$ is different from the parity of the key of $$$u$$$.  If $$$v$$$ has a right subtree whose root is $$$w$$$, then the parity of the key of $$$v$$$ is the same as the parity of the key of $$$w$$$. You are given a single integer $$$n$$$. Find the number of perfectly balanced striped binary search trees with $$$n$$$ vertices that have distinct integer keys between $$$1$$$ and $$$n$$$, inclusive. Output this number modulo $$$998\\,244\\,353$$$.", "input_spec": "The only line contains a single integer $$$n$$$ ($$$1 \\le n \\le 10^6$$$), denoting the required number of vertices.", "output_spec": "Output the number of perfectly balanced striped binary search trees with $$$n$$$ vertices and distinct integer keys between $$$1$$$ and $$$n$$$, inclusive, modulo $$$998\\,244\\,353$$$.", "sample_inputs": ["4", "3"], "sample_outputs": ["1", "0"], "notes": "NoteIn the first example, this is the only tree that satisfies the conditions: In the second example, here are various trees that don't satisfy some condition: "}, "src_uid": "821409c1b9bdcd18c4dcf35dc5116501"}
{"nl": {"description": "The Holmes children are fighting over who amongst them is the cleverest.Mycroft asked Sherlock and Eurus to find value of f(n), where f(1)\u2009=\u20091 and for n\u2009\u2265\u20092, f(n) is the number of distinct ordered positive integer pairs (x,\u2009y) that satisfy x\u2009+\u2009y\u2009=\u2009n and gcd(x,\u2009y)\u2009=\u20091. The integer gcd(a,\u2009b) is the greatest common divisor of a and b.Sherlock said that solving this was child's play and asked Mycroft to instead get the value of . Summation is done over all positive integers d that divide n.Eurus was quietly observing all this and finally came up with her problem to astonish both Sherlock and Mycroft.She defined a k-composite function Fk(n) recursively as follows:She wants them to tell the value of Fk(n) modulo 1000000007.", "input_spec": "A single line of input contains two space separated integers n (1\u2009\u2264\u2009n\u2009\u2264\u20091012) and k (1\u2009\u2264\u2009k\u2009\u2264\u20091012) indicating that Eurus asks Sherlock and Mycroft to find the value of Fk(n) modulo 1000000007.", "output_spec": "Output a single integer\u00a0\u2014 the value of Fk(n) modulo 1000000007.", "sample_inputs": ["7 1", "10 2"], "sample_outputs": ["6", "4"], "notes": "NoteIn the first case, there are 6 distinct ordered pairs (1,\u20096), (2,\u20095), (3,\u20094), (4,\u20093), (5,\u20092) and (6,\u20091) satisfying x\u2009+\u2009y\u2009=\u20097 and gcd(x,\u2009y)\u2009=\u20091. Hence, f(7)\u2009=\u20096. So, F1(7)\u2009=\u2009f(g(7))\u2009=\u2009f(f(7)\u2009+\u2009f(1))\u2009=\u2009f(6\u2009+\u20091)\u2009=\u2009f(7)\u2009=\u20096."}, "src_uid": "0591ade5f9a69afcbecd80402493f975"}
{"nl": {"description": "A and B are preparing themselves for programming contests.An important part of preparing for a competition is sharing programming knowledge from the experienced members to those who are just beginning to deal with the contests. Therefore, during the next team training A decided to make teams so that newbies are solving problems together with experienced participants.A believes that the optimal team of three people should consist of one experienced participant and two newbies. Thus, each experienced participant can share the experience with a large number of people.However, B believes that the optimal team should have two experienced members plus one newbie. Thus, each newbie can gain more knowledge and experience.As a result, A and B have decided that all the teams during the training session should belong to one of the two types described above. Furthermore, they agree that the total number of teams should be as much as possible.There are n experienced members and m newbies on the training session. Can you calculate what maximum number of teams can be formed?", "input_spec": "The first line contains two integers n and m (0\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20095\u00b7105) \u2014 the number of experienced participants and newbies that are present at the training session. ", "output_spec": "Print the maximum number of teams that can be formed.", "sample_inputs": ["2 6", "4 5"], "sample_outputs": ["2", "3"], "notes": "NoteLet's represent the experienced players as XP and newbies as NB.In the first test the teams look as follows: (XP, NB, NB), (XP, NB, NB).In the second test sample the teams look as follows: (XP, NB, NB), (XP, NB, NB), (XP, XP, NB)."}, "src_uid": "0718c6afe52cd232a5e942052527f31b"}
{"nl": {"description": "Roman is a young mathematician, very famous in Uzhland. Unfortunately, Sereja doesn't think so. To make Sereja change his mind, Roman is ready to solve any mathematical problem. After some thought, Sereja asked Roma to find, how many numbers are close to number n, modulo m.Number x is considered close to number n modulo m, if:  it can be obtained by rearranging the digits of number n,  it doesn't have any leading zeroes,  the remainder after dividing number x by m equals 0. Roman is a good mathematician, but the number of such numbers is too huge for him. So he asks you to help him. ", "input_spec": "The first line contains two integers: n (1\u2009\u2264\u2009n\u2009<\u20091018) and m (1\u2009\u2264\u2009m\u2009\u2264\u2009100).", "output_spec": "In a single line print a single integer \u2014 the number of numbers close to number n modulo m.", "sample_inputs": ["104 2", "223 4", "7067678 8"], "sample_outputs": ["3", "1", "47"], "notes": "NoteIn the first sample the required numbers are: 104, 140, 410.In the second sample the required number is 232."}, "src_uid": "5eb90c23ffa3794fdddc5670c0373829"}
{"nl": {"description": "Bob and Alice are often participating in various programming competitions. Like many competitive programmers, Alice and Bob have good and bad days. They noticed, that their lucky and unlucky days are repeating with some period. For example, for Alice days $$$[l_a; r_a]$$$ are lucky, then there are some unlucky days: $$$[r_a + 1; l_a + t_a - 1]$$$, and then there are lucky days again: $$$[l_a + t_a; r_a + t_a]$$$ and so on. In other words, the day is lucky for Alice if it lies in the segment $$$[l_a + k t_a; r_a + k t_a]$$$ for some non-negative integer $$$k$$$.The Bob's lucky day have similar structure, however the parameters of his sequence are different: $$$l_b$$$, $$$r_b$$$, $$$t_b$$$. So a day is a lucky for Bob if it lies in a segment $$$[l_b + k t_b; r_b + k t_b]$$$, for some non-negative integer $$$k$$$.Alice and Bob want to participate in team competitions together and so they want to find out what is the largest possible number of consecutive days, which are lucky for both Alice and Bob.", "input_spec": "The first line contains three integers $$$l_a$$$, $$$r_a$$$, $$$t_a$$$ ($$$0 \\le l_a \\le r_a \\le t_a - 1, 2 \\le t_a \\le 10^9$$$) and describes Alice's lucky days. The second line contains three integers $$$l_b$$$, $$$r_b$$$, $$$t_b$$$ ($$$0 \\le l_b \\le r_b \\le t_b - 1, 2 \\le t_b \\le 10^9$$$) and describes Bob's lucky days. It is guaranteed that both Alice and Bob have some unlucky days.", "output_spec": "Print one integer: the maximum number of days in the row that are lucky for both Alice and Bob.", "sample_inputs": ["0 2 5\n1 3 5", "0 1 3\n2 3 6"], "sample_outputs": ["2", "1"], "notes": "NoteThe graphs below correspond to the two sample tests and show the lucky and unlucky days of Alice and Bob as well as the possible solutions for these tests."}, "src_uid": "faa75751c05c3ff919ddd148c6784910"}
{"nl": {"description": "Sasha and Ira are two best friends. But they aren\u2019t just friends, they are software engineers and experts in artificial intelligence. They are developing an algorithm for two bots playing a two-player game. The game is cooperative and turn based. In each turn, one of the players makes a move (it doesn\u2019t matter which player, it's possible that players turns do not alternate). Algorithm for bots that Sasha and Ira are developing works by keeping track of the state the game is in. Each time either bot makes a move, the state changes. And, since the game is very dynamic, it will never go back to the state it was already in at any point in the past.Sasha and Ira are perfectionists and want their algorithm to have an optimal winning strategy. They have noticed that in the optimal winning strategy, both bots make exactly N moves each. But, in order to find the optimal strategy, their algorithm needs to analyze all possible states of the game (they haven\u2019t learned about alpha-beta pruning yet) and pick the best sequence of moves.They are worried about the efficiency of their algorithm and are wondering what is the total number of states of the game that need to be analyzed? ", "input_spec": "The first and only line contains integer N.   1\u2009\u2264\u2009N\u2009\u2264\u2009106 ", "output_spec": "Output should contain a single integer \u2013 number of possible states modulo 109\u2009+\u20097.", "sample_inputs": ["2"], "sample_outputs": ["19"], "notes": "NoteStart: Game is in state A.   Turn 1: Either bot can make a move (first bot is red and second bot is blue), so there are two possible states after the first turn \u2013 B and C.  Turn 2: In both states B and C, either bot can again make a turn, so the list of possible states is expanded to include D, E, F and G.  Turn 3: Red bot already did N=2 moves when in state D, so it cannot make any more moves there. It can make moves when in state E, F and G, so states I, K and M are added to the list. Similarly, blue bot cannot make a move when in state G, but can when in D, E and F, so states H, J and L are added.  Turn 4: Red bot already did N=2 moves when in states H, I and K, so it can only make moves when in J, L and M, so states P, R and S are added. Blue bot cannot make a move when in states J, L and M, but only when in H, I and K, so states N, O and Q are added. Overall, there are 19 possible states of the game their algorithm needs to analyze."}, "src_uid": "a18833c987fd7743e8021196b5dcdd1b"}
{"nl": {"description": "What joy! Petya's parents went on a business trip for the whole year and the playful kid is left all by himself. Petya got absolutely happy. He jumped on the bed and threw pillows all day long, until... Today Petya opened the cupboard and found a scary note there. His parents had left him with duties: he should water their favourite flower all year, each day, in the morning, in the afternoon and in the evening. \"Wait a second!\" \u2014 thought Petya. He know for a fact that if he fulfills the parents' task in the i-th (1\u2009\u2264\u2009i\u2009\u2264\u200912) month of the year, then the flower will grow by ai centimeters, and if he doesn't water the flower in the i-th month, then the flower won't grow this month. Petya also knows that try as he might, his parents won't believe that he has been watering the flower if it grows strictly less than by k centimeters. Help Petya choose the minimum number of months when he will water the flower, given that the flower should grow no less than by k centimeters.", "input_spec": "The first line contains exactly one integer k (0\u2009\u2264\u2009k\u2009\u2264\u2009100). The next line contains twelve space-separated integers: the i-th (1\u2009\u2264\u2009i\u2009\u2264\u200912) number in the line represents ai (0\u2009\u2264\u2009ai\u2009\u2264\u2009100). ", "output_spec": "Print the only integer \u2014 the minimum number of months when Petya has to water the flower so that the flower grows no less than by k centimeters. If the flower can't grow by k centimeters in a year, print -1.", "sample_inputs": ["5\n1 1 1 1 2 2 3 2 2 1 1 1", "0\n0 0 0 0 0 0 0 1 1 2 3 0", "11\n1 1 4 1 1 5 1 1 4 1 1 1"], "sample_outputs": ["2", "0", "3"], "notes": "NoteLet's consider the first sample test. There it is enough to water the flower during the seventh and the ninth month. Then the flower grows by exactly five centimeters.In the second sample Petya's parents will believe him even if the flower doesn't grow at all (k\u2009=\u20090). So, it is possible for Petya not to water the flower at all."}, "src_uid": "59dfa7a4988375febc5dccc27aca90a8"}
{"nl": {"description": "Consider a billiard table of rectangular size $$$n \\times m$$$ with four pockets. Let's introduce a coordinate system with the origin at the lower left corner (see the picture).   There is one ball at the point $$$(x, y)$$$ currently. Max comes to the table and strikes the ball. The ball starts moving along a line that is parallel to one of the axes or that makes a $$$45^{\\circ}$$$ angle with them. We will assume that:   the angles between the directions of the ball before and after a collision with a side are equal,  the ball moves indefinitely long, it only stops when it falls into a pocket,  the ball can be considered as a point, it falls into a pocket if and only if its coordinates coincide with one of the pockets,  initially the ball is not in a pocket. Note that the ball can move along some side, in this case the ball will just fall into the pocket at the end of the side.Your task is to determine whether the ball will fall into a pocket eventually, and if yes, which of the four pockets it will be.", "input_spec": "The only line contains $$$6$$$ integers $$$n$$$, $$$m$$$, $$$x$$$, $$$y$$$, $$$v_x$$$, $$$v_y$$$ ($$$1 \\leq n, m \\leq 10^9$$$, $$$0 \\leq x \\leq n$$$; $$$0 \\leq y \\leq m$$$; $$$-1 \\leq v_x, v_y \\leq 1$$$; $$$(v_x, v_y) \\neq (0, 0)$$$)\u00a0\u2014 the width of the table, the length of the table, the $$$x$$$-coordinate of the initial position of the ball, the $$$y$$$-coordinate of the initial position of the ball, the $$$x$$$-component of its initial speed and the $$$y$$$-component of its initial speed, respectively. It is guaranteed that the ball is not initially in a pocket.", "output_spec": "Print the coordinates of the pocket the ball will fall into, or $$$-1$$$ if the ball will move indefinitely.", "sample_inputs": ["4 3 2 2 -1 1", "4 4 2 0 1 1", "10 10 10 1 -1 0"], "sample_outputs": ["0 0", "-1", "-1"], "notes": "NoteThe first sample:   The second sample:   In the third sample the ball will never change its $$$y$$$ coordinate, so the ball will never fall into a pocket."}, "src_uid": "6c4ddc688c5aab1432e7328d27c4d8ee"}
{"nl": {"description": "The Smart Beaver from ABBYY was offered a job of a screenwriter for the ongoing TV series. In particular, he needs to automate the hard decision: which main characters will get married by the end of the series.There are n single men and n single women among the main characters. An opinion poll showed that viewers like several couples, and a marriage of any of them will make the audience happy. The Smart Beaver formalized this fact as k triples of numbers (h,\u2009w,\u2009r), where h is the index of the man, w is the index of the woman, and r is the measure of the audience's delight in case of the marriage of this couple. The same poll showed that the marriage of any other couple will leave the audience indifferent, so the screenwriters decided not to include any such marriages in the plot.The script allows you to arrange several marriages between the heroes or not to arrange marriages at all. A subset of some of the k marriages is considered acceptable if each man and each woman is involved in at most one marriage of the subset (the series won't allow any divorces). The value of the acceptable set of marriages is the total delight the spectators will get from the marriages included in this set.Obviously, there is a finite number of acceptable sets, and they all describe some variants of the script. The screenwriters do not want to choose a set with maximum value \u2014 it would make the plot too predictable. So the Smart Beaver offers the following option: sort all the acceptable sets in increasing order of value and choose the t-th set from the sorted list. Thus, t\u2009=\u20091 corresponds to a plot without marriages, t\u2009=\u20092 \u2014 to a single marriage resulting in minimal delight for the audience, and so on.Help the Beaver to implement the algorithm for selecting the desired set.", "input_spec": "The first input line contains integers n, k and t (1\u2009\u2264\u2009k\u2009\u2264\u2009min(100,\u2009n2), 1\u2009\u2264\u2009t\u2009\u2264\u20092\u00b7105), separated by single spaces. Next k lines contain triples of integers (h,\u2009w,\u2009r) (1\u2009\u2264\u2009h,\u2009w\u2009\u2264\u2009n;\u00a01\u2009\u2264\u2009r\u2009\u2264\u20091000), separated by single spaces, which describe the possible marriages. It is guaranteed that the input data is correct: t doesn't exceed the total number of acceptable sets, and each pair (h,\u2009w) is present in at most one triple. The input limitations for getting 30 points are:    1\u2009\u2264\u2009n\u2009\u2264\u20095  The input limitations for getting 100 points are:    1\u2009\u2264\u2009n\u2009\u2264\u200920 ", "output_spec": "Print a single number \u2014 the value of the t-th acceptable variant.", "sample_inputs": ["2 4 3\n1 1 1\n1 2 2\n2 1 3\n2 2 7", "2 4 7\n1 1 1\n1 2 2\n2 1 3\n2 2 7"], "sample_outputs": ["2", "8"], "notes": "NoteThe figure shows 7 acceptable sets of marriages that exist in the first sample.   "}, "src_uid": "7348b5644f232bf377a4834eded42e4b"}
{"nl": {"description": "You are given a binary string $$$s$$$.Find the number of distinct cyclical binary strings of length $$$n$$$ which contain $$$s$$$ as a substring.The cyclical string $$$t$$$ contains $$$s$$$ as a substring if there is some cyclical shift of string $$$t$$$, such that $$$s$$$ is a substring of this cyclical shift of $$$t$$$.For example, the cyclical string \"000111\" contains substrings \"001\", \"01110\" and \"10\", but doesn't contain \"0110\" and \"10110\".Two cyclical strings are called different if they differ from each other as strings. For example, two different strings, which differ from each other by a cyclical shift, are still considered different cyclical strings.", "input_spec": "The first line contains a single integer $$$n$$$ ($$$1 \\le n \\le 40$$$)\u00a0\u2014 the length of the target string $$$t$$$. The next line contains the string $$$s$$$ ($$$1 \\le |s| \\le n$$$)\u00a0\u2014 the string which must be a substring of cyclical string $$$t$$$. String $$$s$$$ contains only characters '0' and '1'.", "output_spec": "Print the only integer\u00a0\u2014 the number of distinct cyclical binary strings $$$t$$$, which contain $$$s$$$ as a substring.", "sample_inputs": ["2\n0", "4\n1010", "20\n10101010101010"], "sample_outputs": ["3", "2", "962"], "notes": "NoteIn the first example, there are three cyclical strings, which contain \"0\"\u00a0\u2014 \"00\", \"01\" and \"10\".In the second example, there are only two such strings\u00a0\u2014 \"1010\", \"0101\"."}, "src_uid": "0034806908c9794086736a2d07fc654c"}
{"nl": {"description": "The 9-th grade student Gabriel noticed a caterpillar on a tree when walking around in a forest after the classes. The caterpillar was on the height h1 cm from the ground. On the height h2 cm (h2\u2009>\u2009h1) on the same tree hung an apple and the caterpillar was crawling to the apple.Gabriel is interested when the caterpillar gets the apple. He noted that the caterpillar goes up by a cm per hour by day and slips down by b cm per hour by night.In how many days Gabriel should return to the forest to see the caterpillar get the apple. You can consider that the day starts at 10 am and finishes at 10 pm. Gabriel's classes finish at 2 pm. You can consider that Gabriel noticed the caterpillar just after the classes at 2 pm.Note that the forest is magic so the caterpillar can slip down under the ground and then lift to the apple.", "input_spec": "The first line contains two integers h1,\u2009h2 (1\u2009\u2264\u2009h1\u2009<\u2009h2\u2009\u2264\u2009105) \u2014 the heights of the position of the caterpillar and the apple in centimeters. The second line contains two integers a,\u2009b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009105) \u2014 the distance the caterpillar goes up by day and slips down by night, in centimeters per hour.", "output_spec": "Print the only integer k \u2014 the number of days Gabriel should wait to return to the forest and see the caterpillar getting the apple. If the caterpillar can't get the apple print the only integer \u2009-\u20091.", "sample_inputs": ["10 30\n2 1", "10 13\n1 1", "10 19\n1 2", "1 50\n5 4"], "sample_outputs": ["1", "0", "-1", "1"], "notes": "NoteIn the first example at 10 pm of the first day the caterpillar gets the height 26. At 10 am of the next day it slips down to the height 14. And finally at 6 pm of the same day the caterpillar gets the apple.Note that in the last example the caterpillar was slipping down under the ground and getting the apple on the next day."}, "src_uid": "2c39638f07c3d789ba4c323a205487d7"}
{"nl": {"description": "Each of you probably has your personal experience of riding public transportation and buying tickets. After a person buys a ticket (which traditionally has an even number of digits), he usually checks whether the ticket is lucky. Let us remind you that a ticket is lucky if the sum of digits in its first half matches the sum of digits in its second half.But of course, not every ticket can be lucky. Far from it! Moreover, sometimes one look at a ticket can be enough to say right away that the ticket is not lucky. So, let's consider the following unluckiness criterion that can definitely determine an unlucky ticket. We'll say that a ticket is definitely unlucky if each digit from the first half corresponds to some digit from the second half so that each digit from the first half is strictly less than the corresponding digit from the second one or each digit from the first half is strictly more than the corresponding digit from the second one. Each digit should be used exactly once in the comparisons. In other words, there is such bijective correspondence between the digits of the first and the second half of the ticket, that either each digit of the first half turns out strictly less than the corresponding digit of the second half or each digit of the first half turns out strictly more than the corresponding digit from the second half.For example, ticket 2421 meets the following unluckiness criterion and will not be considered lucky (the sought correspondence is 2\u2009>\u20091 and 4\u2009>\u20092), ticket 0135 also meets the criterion (the sought correspondence is 0\u2009<\u20093 and 1\u2009<\u20095), and ticket 3754 does not meet the criterion. You have a ticket in your hands, it contains 2n digits. Your task is to check whether it meets the unluckiness criterion.", "input_spec": "The first line contains an integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100). The second line contains a string that consists of 2n digits and defines your ticket.", "output_spec": "In the first line print \"YES\" if the ticket meets the unluckiness criterion. Otherwise, print \"NO\" (without the quotes).", "sample_inputs": ["2\n2421", "2\n0135", "2\n3754"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "e4419bca9d605dbd63f7884377e28769"}
{"nl": {"description": "The only difference between easy and hard versions is the constraints.Polycarp has to write a coursework. The coursework consists of $$$m$$$ pages.Polycarp also has $$$n$$$ cups of coffee. The coffee in the $$$i$$$-th cup has $$$a_i$$$ caffeine in it. Polycarp can drink some cups of coffee (each one no more than once). He can drink cups in any order. Polycarp drinks each cup instantly and completely (i.e. he cannot split any cup into several days).Surely, courseworks are not usually being written in a single day (in a perfect world of Berland, at least). Some of them require multiple days of hard work.Let's consider some day of Polycarp's work. Consider Polycarp drinks $$$k$$$ cups of coffee during this day and caffeine dosages of cups Polycarp drink during this day are $$$a_{i_1}, a_{i_2}, \\dots, a_{i_k}$$$. Then the first cup he drinks gives him energy to write $$$a_{i_1}$$$ pages of coursework, the second cup gives him energy to write $$$max(0, a_{i_2} - 1)$$$ pages, the third cup gives him energy to write $$$max(0, a_{i_3} - 2)$$$ pages, ..., the $$$k$$$-th cup gives him energy to write $$$max(0, a_{i_k} - k + 1)$$$ pages.If Polycarp doesn't drink coffee during some day, he cannot write coursework at all that day.Polycarp has to finish his coursework as soon as possible (spend the minimum number of days to do it). Your task is to find out this number of days or say that it is impossible.", "input_spec": "The first line of the input contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n \\le 100$$$, $$$1 \\le m \\le 10^4$$$) \u2014 the number of cups of coffee and the number of pages in the coursework. The second line of the input contains $$$n$$$ integers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 100$$$), where $$$a_i$$$ is the caffeine dosage of coffee in the $$$i$$$-th cup.", "output_spec": "If it is impossible to write the coursework, print -1. Otherwise print the minimum number of days Polycarp needs to do it.", "sample_inputs": ["5 8\n2 3 1 1 2", "7 10\n1 3 4 2 1 4 2", "5 15\n5 5 5 5 5", "5 16\n5 5 5 5 5", "5 26\n5 5 5 5 5"], "sample_outputs": ["4", "2", "1", "2", "-1"], "notes": "NoteIn the first example Polycarp can drink fourth cup during first day (and write $$$1$$$ page), first and second cups during second day (and write $$$2 + (3 - 1) = 4$$$ pages), fifth cup during the third day (and write $$$2$$$ pages) and third cup during the fourth day (and write $$$1$$$ page) so the answer is $$$4$$$. It is obvious that there is no way to write the coursework in three or less days in this test.In the second example Polycarp can drink third, fourth and second cups during first day (and write $$$4 + (2 - 1) + (3 - 2) = 6$$$ pages) and sixth cup during second day (and write $$$4$$$ pages) so the answer is $$$2$$$. It is obvious that Polycarp cannot write the whole coursework in one day in this test.In the third example Polycarp can drink all cups of coffee during first day and write $$$5 + (5 - 1) + (5 - 2) + (5 - 3) + (5 - 4) = 15$$$ pages of coursework.In the fourth example Polycarp cannot drink all cups during first day and should drink one of them during the second day. So during first day he will write $$$5 + (5 - 1) + (5 - 2) + (5 - 3) = 14$$$ pages of coursework and during second day he will write $$$5$$$ pages of coursework. This is enough to complete it.In the fifth example Polycarp cannot write the whole coursework at all, even if he will drink one cup of coffee during each day, so the answer is -1."}, "src_uid": "acb8a57c8cfdb849a55fa65aff86628d"}
{"nl": {"description": "One Khanate had a lot of roads and very little wood. Riding along the roads was inconvenient, because the roads did not have road signs indicating the direction to important cities.The Han decided that it's time to fix the issue, and ordered to put signs on every road. The Minister of Transport has to do that, but he has only k signs. Help the minister to solve his problem, otherwise the poor guy can lose not only his position, but also his head.More formally, every road in the Khanate is a line on the Oxy plane, given by an equation of the form Ax\u2009+\u2009By\u2009+\u2009C\u2009=\u20090 (A and B are not equal to 0 at the same time). You are required to determine whether you can put signs in at most k points so that each road had at least one sign installed.", "input_spec": "The input starts with two positive integers n, k (1\u2009\u2264\u2009n\u2009\u2264\u2009105,\u20091\u2009\u2264\u2009k\u2009\u2264\u20095) Next n lines contain three integers each, Ai,\u2009Bi,\u2009Ci, the coefficients of the equation that determines the road (|Ai|,\u2009|Bi|,\u2009|Ci|\u2009\u2264\u2009105, Ai2\u2009+\u2009Bi2\u2009\u2260\u20090). It is guaranteed that no two roads coincide.", "output_spec": "If there is no solution, print \"NO\" in the single line (without the quotes). Otherwise, print in the first line \"YES\" (without the quotes). In the second line print a single number m (m\u2009\u2264\u2009k) \u2014 the number of used signs. In the next m lines print the descriptions of their locations. Description of a location of one sign is two integers v,\u2009u. If u and v are two distinct integers between 1 and n, we assume that sign is at the point of intersection of roads number v and u. If u\u2009=\u2009\u2009-\u20091, and v is an integer between 1 and n, then the sign is on the road number v in the point not lying on any other road. In any other case the description of a sign will be assumed invalid and your answer will be considered incorrect. In case if v\u2009=\u2009u, or if v and u are the numbers of two non-intersecting roads, your answer will also be considered incorrect. The roads are numbered starting from 1 in the order in which they follow in the input.", "sample_inputs": ["3 1\n1 0 0\n0 -1 0\n7 -93 0", "3 1\n1 0 0\n0 1 0\n1 1 3", "2 3\n3 4 5\n5 6 7"], "sample_outputs": ["YES\n1\n1 2", "NO", "YES\n2\n1 -1\n2 -1"], "notes": "NoteNote that you do not have to minimize m, but it shouldn't be more than k.In the first test all three roads intersect at point (0,0).In the second test all three roads form a triangle and there is no way to place one sign so that it would stand on all three roads at once."}, "src_uid": "dea5c9eded04f1a900c37571d20b34e2"}
{"nl": {"description": "Your security guard friend recently got a new job at a new security company. The company requires him to patrol an area of the city encompassing exactly N city blocks, but they let him choose which blocks. That is, your friend must walk the perimeter of a region whose area is exactly N blocks. Your friend is quite lazy and would like your help to find the shortest possible route that meets the requirements. The city is laid out in a square grid pattern, and is large enough that for the sake of the problem it can be considered infinite.", "input_spec": "Input will consist of a single integer N (1\u2009\u2264\u2009N\u2009\u2264\u2009106), the number of city blocks that must be enclosed by the route.", "output_spec": "Print the minimum perimeter that can be achieved.", "sample_inputs": ["4", "11", "22"], "sample_outputs": ["8", "14", "20"], "notes": "NoteHere are some possible shapes for the examples:"}, "src_uid": "414cc57550e31d98c1a6a56be6722a12"}
{"nl": {"description": "The only king stands on the standard chess board. You are given his position in format \"cd\", where c is the column from 'a' to 'h' and d is the row from '1' to '8'. Find the number of moves permitted for the king.Check the king's moves here https://en.wikipedia.org/wiki/King_(chess).  King moves from the position e4 ", "input_spec": "The only line contains the king's position in the format \"cd\", where 'c' is the column from 'a' to 'h' and 'd' is the row from '1' to '8'.", "output_spec": "Print the only integer x \u2014 the number of moves permitted for the king.", "sample_inputs": ["e4"], "sample_outputs": ["8"], "notes": null}, "src_uid": "6994331ca6282669cbb7138eb7e55e01"}
{"nl": {"description": "Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.One day Petya came across an interval of numbers [a,\u2009a\u2009+\u2009l\u2009-\u20091]. Let F(x) be the number of lucky digits of number x. Find the minimum b (a\u2009<\u2009b) such, that F(a) = F(b), F(a\u2009+\u20091) = F(b\u2009+\u20091), ..., F(a\u2009+\u2009l\u2009-\u20091) = F(b\u2009+\u2009l\u2009-\u20091).", "input_spec": "The single line contains two integers a and l (1\u2009\u2264\u2009a,\u2009l\u2009\u2264\u2009109) \u2014 the interval's first number and the interval's length correspondingly.", "output_spec": "On the single line print number b \u2014 the answer to the problem.", "sample_inputs": ["7 4", "4 7"], "sample_outputs": ["17", "14"], "notes": "NoteConsider that [a,\u2009b] denotes an interval of integers; this interval includes the boundaries. That is, "}, "src_uid": "649e9f477b97c1f72b05d409b4a99d59"}
{"nl": {"description": "Year 2118. Androids are in mass production for decades now, and they do all the work for humans. But androids have to go to school to be able to solve creative tasks. Just like humans before.It turns out that high school struggles are not gone. If someone is not like others, he is bullied. Vasya-8800 is an economy-class android which is produced by a little-known company. His design is not perfect, his characteristics also could be better. So he is bullied by other androids.One of the popular pranks on Vasya is to force him to compare $$$x^y$$$ with $$$y^x$$$. Other androids can do it in milliseconds while Vasya's memory is too small to store such big numbers.Please help Vasya! Write a fast program to compare $$$x^y$$$ with $$$y^x$$$ for Vasya, maybe then other androids will respect him.", "input_spec": "On the only line of input there are two integers $$$x$$$ and $$$y$$$ ($$$1 \\le x, y \\le 10^{9}$$$).", "output_spec": "If $$$x^y < y^x$$$, then print '<' (without quotes). If $$$x^y > y^x$$$, then print '>' (without quotes). If $$$x^y = y^x$$$, then print '=' (without quotes).", "sample_inputs": ["5 8", "10 3", "6 6"], "sample_outputs": [">", "<", "="], "notes": "NoteIn the first example $$$5^8 = 5 \\cdot 5 \\cdot 5 \\cdot 5 \\cdot 5 \\cdot 5 \\cdot 5 \\cdot 5 = 390625$$$, and $$$8^5 = 8 \\cdot 8 \\cdot 8 \\cdot 8 \\cdot 8 = 32768$$$. So you should print '>'.In the second example $$$10^3 = 1000 < 3^{10} = 59049$$$.In the third example $$$6^6 = 46656 = 6^6$$$."}, "src_uid": "ec1e44ff41941f0e6436831b5ae543c6"}
{"nl": {"description": "Jon fought bravely to rescue the wildlings who were attacked by the white-walkers at Hardhome. On his arrival, Sam tells him that he wants to go to Oldtown to train at the Citadel to become a maester, so he can return and take the deceased Aemon's place as maester of Castle Black. Jon agrees to Sam's proposal and Sam sets off his journey to the Citadel. However becoming a trainee at the Citadel is not a cakewalk and hence the maesters at the Citadel gave Sam a problem to test his eligibility. Initially Sam has a list with a single element n. Then he has to perform certain operations on this list. In each operation Sam must remove any element x, such that x\u2009>\u20091, from the list and insert at the same position , ,  sequentially. He must continue with these operations until all the elements in the list are either 0 or 1.Now the masters want the total number of 1s in the range l to r (1-indexed). Sam wants to become a maester but unfortunately he cannot solve this problem. Can you help Sam to pass the eligibility test?", "input_spec": "The first line contains three integers n, l, r (0\u2009\u2264\u2009n\u2009<\u2009250, 0\u2009\u2264\u2009r\u2009-\u2009l\u2009\u2264\u2009105, r\u2009\u2265\u20091, l\u2009\u2265\u20091) \u2013 initial element and the range l to r. It is guaranteed that r is not greater than the length of the final list.", "output_spec": "Output the total number of 1s in the range l to r in the final sequence.", "sample_inputs": ["7 2 5", "10 3 10"], "sample_outputs": ["4", "5"], "notes": "NoteConsider first example:Elements on positions from 2-nd to 5-th in list is [1,\u20091,\u20091,\u20091]. The number of ones is 4.For the second example:Elements on positions from 3-rd to 10-th in list is [1,\u20091,\u20091,\u20090,\u20091,\u20090,\u20091,\u20090]. The number of ones is 5."}, "src_uid": "3ac61b1f8deee7911b1055c243f5eb6a"}
{"nl": {"description": "Students in a class are making towers of blocks. Each student makes a (non-zero) tower by stacking pieces lengthwise on top of each other. n of the students use pieces made of two blocks and m of the students use pieces made of three blocks.The students don\u2019t want to use too many blocks, but they also want to be unique, so no two students\u2019 towers may contain the same number of blocks. Find the minimum height necessary for the tallest of the students' towers.", "input_spec": "The first line of the input contains two space-separated integers n and m (0\u2009\u2264\u2009n,\u2009m\u2009\u2264\u20091\u2009000\u2009000, n\u2009+\u2009m\u2009>\u20090)\u00a0\u2014 the number of students using two-block pieces and the number of students using three-block pieces, respectively.", "output_spec": "Print a single integer, denoting the minimum possible height of the tallest tower.", "sample_inputs": ["1 3", "3 2", "5 0"], "sample_outputs": ["9", "8", "10"], "notes": "NoteIn the first case, the student using two-block pieces can make a tower of height 4, and the students using three-block pieces can make towers of height 3, 6, and 9 blocks. The tallest tower has a height of 9 blocks.In the second case, the students can make towers of heights 2, 4, and 8 with two-block pieces and towers of heights 3 and 6 with three-block pieces, for a maximum height of 8 blocks."}, "src_uid": "23f2c8cac07403899199abdcfd947a5a"}
{"nl": {"description": "Wet Shark asked Rat Kwesh to generate three positive real numbers x, y and z, from 0.1 to 200.0, inclusive. Wet Krash wants to impress Wet Shark, so all generated numbers will have exactly one digit after the decimal point.Wet Shark knows Rat Kwesh will want a lot of cheese. So he will give the Rat an opportunity to earn a lot of cheese. He will hand the three numbers x, y and z to Rat Kwesh, and Rat Kwesh will pick one of the these twelve options:  a1\u2009=\u2009xyz;  a2\u2009=\u2009xzy;  a3\u2009=\u2009(xy)z;  a4\u2009=\u2009(xz)y;  a5\u2009=\u2009yxz;  a6\u2009=\u2009yzx;  a7\u2009=\u2009(yx)z;  a8\u2009=\u2009(yz)x;  a9\u2009=\u2009zxy;  a10\u2009=\u2009zyx;  a11\u2009=\u2009(zx)y;  a12\u2009=\u2009(zy)x. Let m be the maximum of all the ai, and c be the smallest index (from 1 to 12) such that ac\u2009=\u2009m. Rat's goal is to find that c, and he asks you to help him. Rat Kwesh wants to see how much cheese he gets, so he you will have to print the expression corresponding to that ac. ", "input_spec": "The only line of the input contains three space-separated real numbers x, y and z (0.1\u2009\u2264\u2009x,\u2009y,\u2009z\u2009\u2264\u2009200.0). Each of x, y and z is given with exactly one digit after the decimal point.", "output_spec": "Find the maximum value of expression among xyz, xzy, (xy)z, (xz)y, yxz, yzx, (yx)z, (yz)x, zxy, zyx, (zx)y, (zy)x and print the corresponding expression. If there are many maximums, print the one that comes first in the list.  xyz should be outputted as x^y^z (without brackets), and (xy)z should be outputted as (x^y)^z (quotes for clarity). ", "sample_inputs": ["1.1 3.4 2.5", "2.0 2.0 2.0", "1.9 1.8 1.7"], "sample_outputs": ["z^y^x", "x^y^z", "(x^y)^z"], "notes": null}, "src_uid": "a71cb5cda754ad2bf479bc3b0164fc4c"}
{"nl": {"description": "Jamie loves sleeping. One day, he decides that he needs to wake up at exactly hh:\u2009mm. However, he hates waking up, so he wants to make waking up less painful by setting the alarm at a lucky time. He will then press the snooze button every x minutes until hh:\u2009mm is reached, and only then he will wake up. He wants to know what is the smallest number of times he needs to press the snooze button.A time is considered lucky if it contains a digit '7'. For example, 13:\u200907 and 17:\u200927 are lucky, while 00:\u200948 and 21:\u200934 are not lucky.Note that it is not necessary that the time set for the alarm and the wake-up time are on the same day. It is guaranteed that there is a lucky time Jamie can set so that he can wake at hh:\u2009mm.Formally, find the smallest possible non-negative integer y such that the time representation of the time x\u00b7y minutes before hh:\u2009mm contains the digit '7'.Jamie uses 24-hours clock, so after 23:\u200959 comes 00:\u200900.", "input_spec": "The first line contains a single integer x (1\u2009\u2264\u2009x\u2009\u2264\u200960). The second line contains two two-digit integers, hh and mm (00\u2009\u2264\u2009hh\u2009\u2264\u200923,\u200900\u2009\u2264\u2009mm\u2009\u2264\u200959).", "output_spec": "Print the minimum number of times he needs to press the button.", "sample_inputs": ["3\n11 23", "5\n01 07"], "sample_outputs": ["2", "0"], "notes": "NoteIn the first sample, Jamie needs to wake up at 11:23. So, he can set his alarm at 11:17. He would press the snooze button when the alarm rings at 11:17 and at 11:20.In the second sample, Jamie can set his alarm at exactly at 01:07 which is lucky."}, "src_uid": "5ecd569e02e0164a5da9ff549fca3ceb"}
{"nl": {"description": "Mishka is decorating the Christmas tree. He has got three garlands, and all of them will be put on the tree. After that Mishka will switch these garlands on.When a garland is switched on, it periodically changes its state \u2014 sometimes it is lit, sometimes not. Formally, if i-th garland is switched on during x-th second, then it is lit only during seconds x, x\u2009+\u2009ki, x\u2009+\u20092ki, x\u2009+\u20093ki and so on.Mishka wants to switch on the garlands in such a way that during each second after switching the garlands on there would be at least one lit garland. Formally, Mishka wants to choose three integers x1, x2 and x3 (not necessarily distinct) so that he will switch on the first garland during x1-th second, the second one \u2014 during x2-th second, and the third one \u2014 during x3-th second, respectively, and during each second starting from max(x1,\u2009x2,\u2009x3) at least one garland will be lit.Help Mishka by telling him if it is possible to do this!", "input_spec": "The first line contains three integers k1, k2 and k3 (1\u2009\u2264\u2009ki\u2009\u2264\u20091500) \u2014 time intervals of the garlands.", "output_spec": "If Mishka can choose moments of time to switch on the garlands in such a way that each second after switching the garlands on at least one garland will be lit, print YES. Otherwise, print NO.", "sample_inputs": ["2 2 3", "4 2 3"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example Mishka can choose x1\u2009=\u20091, x2\u2009=\u20092, x3\u2009=\u20091. The first garland will be lit during seconds 1,\u20093,\u20095,\u20097,\u2009..., the second \u2014 2,\u20094,\u20096,\u20098,\u2009..., which already cover all the seconds after the 2-nd one. It doesn't even matter what x3 is chosen. Our choice will lead third to be lit during seconds 1,\u20094,\u20097,\u200910,\u2009..., though.In the second example there is no way to choose such moments of time, there always be some seconds when no garland is lit."}, "src_uid": "df48af9f5e68cb6efc1214f7138accf9"}
{"nl": {"description": "Finished her homework, Nastya decided to play computer games. Passing levels one by one, Nastya eventually faced a problem. Her mission is to leave a room, where a lot of monsters live, as quickly as possible.There are $$$n$$$ manholes in the room which are situated on one line, but, unfortunately, all the manholes are closed, and there is one stone on every manhole. There is exactly one coin under every manhole, and to win the game Nastya should pick all the coins. Initially Nastya stands near the $$$k$$$-th manhole from the left. She is thinking what to do.In one turn, Nastya can do one of the following:   if there is at least one stone on the manhole Nastya stands near, throw exactly one stone from it onto any other manhole (yes, Nastya is strong).  go to a neighboring manhole;  if there are no stones on the manhole Nastya stays near, she can open it and pick the coin from it. After it she must close the manhole immediately (it doesn't require additional moves).     The figure shows the intermediate state of the game. At the current position Nastya can throw the stone to any other manhole or move left or right to the neighboring manholes. If she were near the leftmost manhole, she could open it (since there are no stones on it). Nastya can leave the room when she picks all the coins. Monsters are everywhere, so you need to compute the minimum number of moves Nastya has to make to pick all the coins.Note one time more that Nastya can open a manhole only when there are no stones onto it.", "input_spec": "The first and only line contains two integers $$$n$$$ and $$$k$$$, separated by space ($$$2 \\leq n \\leq 5000$$$, $$$1 \\leq k \\leq n$$$)\u00a0\u2014 the number of manholes and the index of manhole from the left, near which Nastya stays initially. Initially there is exactly one stone near each of the $$$n$$$ manholes. ", "output_spec": "Print a single integer\u00a0\u2014 minimum number of moves which lead Nastya to pick all the coins.", "sample_inputs": ["2 2", "4 2", "5 1"], "sample_outputs": ["6", "13", "15"], "notes": "NoteLet's consider the example where $$$n = 2$$$, $$$k = 2$$$. Nastya should play as follows:  At first she throws the stone from the second manhole to the first. Now there are two stones on the first manhole.  Then she opens the second manhole and pick the coin from it.  Then she goes to the first manhole, throws two stones by two moves to the second manhole and then opens the manhole and picks the coin from it. So, $$$6$$$ moves are required to win."}, "src_uid": "24b02afe8d86314ec5f75a00c72af514"}
{"nl": {"description": "Last summer Peter was at his granny's in the country, when a wolf attacked sheep in the nearby forest. Now he fears to walk through the forest, to walk round the forest, even to get out of the house. He explains this not by the fear of the wolf, but by a strange, in his opinion, pattern of the forest that has n levels, where n is an even number.In the local council you were given an area map, where the granny's house is marked by point H, parts of dense forest are marked grey (see the picture to understand better).After a long time at home Peter decided to yield to his granny's persuasions and step out for a breath of fresh air. Being prudent, Peter plans the route beforehand. The route, that Peter considers the most suitable, has the following characteristics:   it starts and ends in the same place \u2014 the granny's house;  the route goes along the forest paths only (these are the segments marked black in the picture);  the route has positive length (to step out for a breath of fresh air Peter has to cover some distance anyway);  the route cannot cross itself;  there shouldn't be any part of dense forest within the part marked out by this route; You should find the amount of such suitable oriented routes modulo 1000000009.  The example of the area map for n\u2009=\u200912 is given in the picture. Since the map has a regular structure, you can construct it for other n by analogy using the example.", "input_spec": "The input data contain the only even integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009106).", "output_spec": "Output the only number \u2014 the amount of Peter's routes modulo 1000000009.", "sample_inputs": ["2", "4"], "sample_outputs": ["10", "74"], "notes": null}, "src_uid": "dbcb1077e7421554ba5d69b64d22c937"}
{"nl": {"description": "Robbers, who attacked the Gerda's cab, are very successful in covering from the kingdom police. To make the goal of catching them even harder, they use their own watches.First, as they know that kingdom police is bad at math, robbers use the positional numeral system with base 7. Second, they divide one day in n hours, and each hour in m minutes. Personal watches of each robber are divided in two parts: first of them has the smallest possible number of places that is necessary to display any integer from 0 to n\u2009-\u20091, while the second has the smallest possible number of places that is necessary to display any integer from 0 to m\u2009-\u20091. Finally, if some value of hours or minutes can be displayed using less number of places in base 7 than this watches have, the required number of zeroes is added at the beginning of notation.Note that to display number 0 section of the watches is required to have at least one place.Little robber wants to know the number of moments of time (particular values of hours and minutes), such that all digits displayed on the watches are distinct. Help her calculate this number.", "input_spec": "The first line of the input contains two integers, given in the decimal notation, n and m (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009109)\u00a0\u2014 the number of hours in one day and the number of minutes in one hour, respectively.", "output_spec": "Print one integer in decimal notation\u00a0\u2014 the number of different pairs of hour and minute, such that all digits displayed on the watches are distinct.", "sample_inputs": ["2 3", "8 2"], "sample_outputs": ["4", "5"], "notes": "NoteIn the first sample, possible pairs are: (0:\u20091), (0:\u20092), (1:\u20090), (1:\u20092).In the second sample, possible pairs are: (02:\u20091), (03:\u20091), (04:\u20091), (05:\u20091), (06:\u20091)."}, "src_uid": "0930c75f57dd88a858ba7bb0f11f1b1c"}
{"nl": {"description": "The final round of Bayan Programming Contest will be held in Tehran, and the participants will be carried around with a yellow bus. The bus has 34 passenger seats: 4 seats in the last row and 3 seats in remaining rows.   The event coordinator has a list of k participants who should be picked up at the airport. When a participant gets on the bus, he will sit in the last row with an empty seat. If there is more than one empty seat in that row, he will take the leftmost one. In order to keep track of the people who are on the bus, the event coordinator needs a figure showing which seats are going to be taken by k participants. Your task is to draw the figure representing occupied seats.", "input_spec": "The only line of input contains integer k, (0\u2009\u2264\u2009k\u2009\u2264\u200934), denoting the number of participants.", "output_spec": "Print the figure of a bus with k passengers as described in sample tests. Character '#' denotes an empty seat, while 'O' denotes a taken seat. 'D' is the bus driver and other characters in the output are for the purpose of beautifying the figure. Strictly follow the sample test cases output format. Print exactly six lines. Do not output extra space or other characters.", "sample_inputs": ["9", "20"], "sample_outputs": ["+------------------------+\n|O.O.O.#.#.#.#.#.#.#.#.|D|)\n|O.O.O.#.#.#.#.#.#.#.#.|.|\n|O.......................|\n|O.O.#.#.#.#.#.#.#.#.#.|.|)\n+------------------------+", "+------------------------+\n|O.O.O.O.O.O.O.#.#.#.#.|D|)\n|O.O.O.O.O.O.#.#.#.#.#.|.|\n|O.......................|\n|O.O.O.O.O.O.#.#.#.#.#.|.|)\n+------------------------+"], "notes": null}, "src_uid": "075f83248f6d4d012e0ca1547fc67993"}
{"nl": {"description": "Stepan is a very experienced olympiad participant. He has n cups for Physics olympiads and m cups for Informatics olympiads. Each cup is characterized by two parameters \u2014 its significance ci and width wi.Stepan decided to expose some of his cups on a shelf with width d in such a way, that:  there is at least one Physics cup and at least one Informatics cup on the shelf,  the total width of the exposed cups does not exceed d,  from each subjects (Physics and Informatics) some of the most significant cups are exposed (i. e. if a cup for some subject with significance x is exposed, then all the cups for this subject with significance greater than x must be exposed too). Your task is to determine the maximum possible total significance, which Stepan can get when he exposes cups on the shelf with width d, considering all the rules described above. The total significance is the sum of significances of all the exposed cups.", "input_spec": "The first line contains three integers n, m and d (1\u2009\u2264\u2009n,\u2009m\u2009\u2264\u2009100\u2009000, 1\u2009\u2264\u2009d\u2009\u2264\u2009109) \u2014 the number of cups for Physics olympiads, the number of cups for Informatics olympiads and the width of the shelf. Each of the following n lines contains two integers ci and wi (1\u2009\u2264\u2009ci,\u2009wi\u2009\u2264\u2009109) \u2014 significance and width of the i-th cup for Physics olympiads. Each of the following m lines contains two integers cj and wj (1\u2009\u2264\u2009cj,\u2009wj\u2009\u2264\u2009109) \u2014 significance and width of the j-th cup for Informatics olympiads.", "output_spec": "Print the maximum possible total significance, which Stepan can get exposing cups on the shelf with width d, considering all the rules described in the statement. If there is no way to expose cups on the shelf, then print 0.", "sample_inputs": ["3 1 8\n4 2\n5 5\n4 2\n3 2", "4 3 12\n3 4\n2 4\n3 5\n3 4\n3 5\n5 2\n3 4", "2 2 2\n5 3\n6 3\n4 2\n8 1"], "sample_outputs": ["8", "11", "0"], "notes": "NoteIn the first example Stepan has only one Informatics cup which must be exposed on the shelf. Its significance equals 3 and width equals 2, so after Stepan exposes it, the width of free space on the shelf becomes equal to 6. Also, Stepan must expose the second Physics cup (which has width 5), because it is the most significant cup for Physics (its significance equals 5). After that Stepan can not expose more cups on the shelf, because there is no enough free space. Thus, the maximum total significance of exposed cups equals to 8."}, "src_uid": "da573a39459087ed7c42f70bc1d0e8ff"}
{"nl": {"description": "Memory is now interested in the de-evolution of objects, specifically triangles. He starts with an equilateral triangle of side length x, and he wishes to perform operations to obtain an equilateral triangle of side length y.In a single second, he can modify the length of a single side of the current triangle such that it remains a non-degenerate triangle (triangle of positive area). At any moment of time, the length of each side should be integer.What is the minimum number of seconds required for Memory to obtain the equilateral triangle of side length y?", "input_spec": "The first and only line contains two integers x and y (3\u2009\u2264\u2009y\u2009<\u2009x\u2009\u2264\u2009100\u2009000)\u00a0\u2014 the starting and ending equilateral triangle side lengths respectively.", "output_spec": "Print a single integer\u00a0\u2014 the minimum number of seconds required for Memory to obtain the equilateral triangle of side length y if he starts with the equilateral triangle of side length x.", "sample_inputs": ["6 3", "8 5", "22 4"], "sample_outputs": ["4", "3", "6"], "notes": "NoteIn the first sample test, Memory starts with an equilateral triangle of side length 6 and wants one of side length 3. Denote a triangle with sides a, b, and c as (a,\u2009b,\u2009c). Then, Memory can do .In the second sample test, Memory can do .In the third sample test, Memory can do: ."}, "src_uid": "8edf64f5838b19f9a8b19a14977f5615"}
{"nl": {"description": "Two boys decided to compete in text typing on the site \"Key races\". During the competition, they have to type a text consisting of s characters. The first participant types one character in v1 milliseconds and has ping t1 milliseconds. The second participant types one character in v2 milliseconds and has ping t2 milliseconds.If connection ping (delay) is t milliseconds, the competition passes for a participant as follows:   Exactly after t milliseconds after the start of the competition the participant receives the text to be entered.  Right after that he starts to type it.  Exactly t milliseconds after he ends typing all the text, the site receives information about it. The winner is the participant whose information on the success comes earlier. If the information comes from both participants at the same time, it is considered that there is a draw.Given the length of the text and the information about participants, determine the result of the game.", "input_spec": "The first line contains five integers s, v1, v2, t1, t2 (1\u2009\u2264\u2009s,\u2009v1,\u2009v2,\u2009t1,\u2009t2\u2009\u2264\u20091000)\u00a0\u2014 the number of characters in the text, the time of typing one character for the first participant, the time of typing one character for the the second participant, the ping of the first participant and the ping of the second participant.", "output_spec": "If the first participant wins, print \"First\". If the second participant wins, print \"Second\". In case of a draw print \"Friendship\".", "sample_inputs": ["5 1 2 1 2", "3 3 1 1 1", "4 5 3 1 5"], "sample_outputs": ["First", "Second", "Friendship"], "notes": "NoteIn the first example, information on the success of the first participant comes in 7 milliseconds, of the second participant\u00a0\u2014 in 14 milliseconds. So, the first wins.In the second example, information on the success of the first participant comes in 11 milliseconds, of the second participant\u00a0\u2014 in 5 milliseconds. So, the second wins.In the third example, information on the success of the first participant comes in 22 milliseconds, of the second participant\u00a0\u2014 in 22 milliseconds. So, it is be a draw."}, "src_uid": "10226b8efe9e3c473239d747b911a1ef"}
{"nl": {"description": "Misha and Vanya have played several table tennis sets. Each set consists of several serves, each serve is won by one of the players, he receives one point and the loser receives nothing. Once one of the players scores exactly k points, the score is reset and a new set begins.Across all the sets Misha scored a points in total, and Vanya scored b points. Given this information, determine the maximum number of sets they could have played, or that the situation is impossible.Note that the game consisted of several complete sets.", "input_spec": "The first line contains three space-separated integers k, a and b (1\u2009\u2264\u2009k\u2009\u2264\u2009109, 0\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109, a\u2009+\u2009b\u2009>\u20090).", "output_spec": "If the situation is impossible, print a single number -1. Otherwise, print the maximum possible number of sets.", "sample_inputs": ["11 11 5", "11 2 3"], "sample_outputs": ["1", "-1"], "notes": "NoteNote that the rules of the game in this problem differ from the real table tennis game, for example, the rule of \"balance\" (the winning player has to be at least two points ahead to win a set) has no power within the present problem."}, "src_uid": "6e3b8193d1ca1a1d449dc7a4ad45b8f2"}
{"nl": {"description": "One day Alex was creating a contest about his friends, but accidentally deleted it. Fortunately, all the problems were saved, but now he needs to find them among other problems.But there are too many problems, to do it manually. Alex asks you to write a program, which will determine if a problem is from this contest by its name.It is known, that problem is from this contest if and only if its name contains one of Alex's friends' name exactly once. His friends' names are \"Danil\", \"Olya\", \"Slava\", \"Ann\" and \"Nikita\".Names are case sensitive.", "input_spec": "The only line contains string from lowercase and uppercase letters and \"_\" symbols of length, not more than 100 \u2014 the name of the problem.", "output_spec": "Print \"YES\", if problem is from this contest, and \"NO\" otherwise.", "sample_inputs": ["Alex_and_broken_contest", "NikitaAndString", "Danil_and_Olya"], "sample_outputs": ["NO", "YES", "NO"], "notes": null}, "src_uid": "db2dc7500ff4d84dcc1a37aebd2b3710"}
{"nl": {"description": "Tonight is brain dinner night and all zombies will gather together to scarf down some delicious brains. The artful Heidi plans to crash the party, incognito, disguised as one of them. Her objective is to get away with at least one brain, so she can analyze the zombies' mindset back home and gain a strategic advantage.They will be N guests tonight: N\u2009-\u20091 real zombies and a fake one, our Heidi. The living-dead love hierarchies as much as they love brains: each one has a unique rank in the range 1 to N\u2009-\u20091, and Heidi, who still appears slightly different from the others, is attributed the highest rank, N. Tonight there will be a chest with brains on display and every attendee sees how many there are. These will then be split among the attendees according to the following procedure:The zombie of the highest rank makes a suggestion on who gets how many brains (every brain is an indivisible entity). A vote follows. If at least half of the attendees accept the offer, the brains are shared in the suggested way and the feast begins. But if majority is not reached, then the highest-ranked zombie is killed, and the next zombie in hierarchy has to make a suggestion. If he is killed too, then the third highest-ranked makes one, etc. (It's enough to have exactly half of the votes \u2013 in case of a tie, the vote of the highest-ranked alive zombie counts twice, and he will of course vote in favor of his own suggestion in order to stay alive.)You should know that zombies are very greedy and sly, and they know this too \u2013 basically all zombie brains are alike. Consequently, a zombie will never accept an offer which is suboptimal for him. That is, if an offer is not strictly better than a potential later offer, he will vote against it. And make no mistake: while zombies may normally seem rather dull, tonight their intellects are perfect. Each zombie's priorities for tonight are, in descending order:   survive the event (they experienced death already once and know it is no fun),  get as many brains as possible. Heidi goes first and must make an offer which at least half of the attendees will accept, and which allocates at least one brain for Heidi herself.What is the smallest number of brains that have to be in the chest for this to be possible?", "input_spec": "The only line of input contains one integer: N, the number of attendees (1\u2009\u2264\u2009N\u2009\u2264\u2009109).", "output_spec": "Output one integer: the smallest number of brains in the chest which allows Heidi to take one brain home.", "sample_inputs": ["1", "4"], "sample_outputs": ["1", "2"], "notes": "Note"}, "src_uid": "30e95770f12c631ce498a2b20c2931c7"}
{"nl": {"description": "Vasya will fancy any number as long as it is an integer power of two. Petya, on the other hand, is very conservative and only likes a single integer $$$p$$$ (which may be positive, negative, or zero). To combine their tastes, they invented $$$p$$$-binary numbers of the form $$$2^x + p$$$, where $$$x$$$ is a non-negative integer.For example, some $$$-9$$$-binary (\"minus nine\" binary) numbers are: $$$-8$$$ (minus eight), $$$7$$$ and $$$1015$$$ ($$$-8=2^0-9$$$, $$$7=2^4-9$$$, $$$1015=2^{10}-9$$$).The boys now use $$$p$$$-binary numbers to represent everything. They now face a problem: given a positive integer $$$n$$$, what's the smallest number of $$$p$$$-binary numbers (not necessarily distinct) they need to represent $$$n$$$ as their sum? It may be possible that representation is impossible altogether. Help them solve this problem.For example, if $$$p=0$$$ we can represent $$$7$$$ as $$$2^0 + 2^1 + 2^2$$$.And if $$$p=-9$$$ we can represent $$$7$$$ as one number $$$(2^4-9)$$$.Note that negative $$$p$$$-binary numbers are allowed to be in the sum (see the Notes section for an example).", "input_spec": "The only line contains two integers $$$n$$$ and $$$p$$$ ($$$1 \\leq n \\leq 10^9$$$, $$$-1000 \\leq p \\leq 1000$$$).", "output_spec": "If it is impossible to represent $$$n$$$ as the sum of any number of $$$p$$$-binary numbers, print a single integer $$$-1$$$. Otherwise, print the smallest possible number of summands.", "sample_inputs": ["24 0", "24 1", "24 -1", "4 -7", "1 1"], "sample_outputs": ["2", "3", "4", "2", "-1"], "notes": "Note$$$0$$$-binary numbers are just regular binary powers, thus in the first sample case we can represent $$$24 = (2^4 + 0) + (2^3 + 0)$$$.In the second sample case, we can represent $$$24 = (2^4 + 1) + (2^2 + 1) + (2^0 + 1)$$$.In the third sample case, we can represent $$$24 = (2^4 - 1) + (2^2 - 1) + (2^2 - 1) + (2^2 - 1)$$$. Note that repeated summands are allowed.In the fourth sample case, we can represent $$$4 = (2^4 - 7) + (2^1 - 7)$$$. Note that the second summand is negative, which is allowed.In the fifth sample case, no representation is possible."}, "src_uid": "9e86d87ce5a75c6a982894af84eb4ba8"}
{"nl": {"description": "The new operating system BerOS has a nice feature. It is possible to use any number of characters '/' as a delimiter in path instead of one traditional '/'. For example, strings //usr///local//nginx/sbin// and /usr/local/nginx///sbin are equivalent. The character '/' (or some sequence of such characters) at the end of the path is required only in case of the path to the root directory, which can be represented as single character '/'.A path called normalized if it contains the smallest possible number of characters '/'.Your task is to transform a given path to the normalized form.", "input_spec": "The first line of the input contains only lowercase Latin letters and character '/'\u00a0\u2014 the path to some directory. All paths start with at least one character '/'. The length of the given line is no more than 100 characters, it is not empty.", "output_spec": "The path in normalized form.", "sample_inputs": ["//usr///local//nginx/sbin"], "sample_outputs": ["/usr/local/nginx/sbin"], "notes": null}, "src_uid": "6c2e658ac3c3d6b0569dd373806fa031"}
{"nl": {"description": "Just in case somebody missed it: this winter is totally cold in Nvodsk! It is so cold that one gets funny thoughts. For example, let's say there are strings with the length exactly n, based on the alphabet of size m. Any its substring with length equal to k is a palindrome. How many such strings exist? Your task is to find their quantity modulo 1000000007 (109\u2009+\u20097). Be careful and don't miss a string or two!Let us remind you that a string is a palindrome if it can be read the same way in either direction, from the left to the right and from the right to the left.", "input_spec": "The first and only line contains three integers: n, m and k (1\u2009\u2264\u2009n,\u2009m,\u2009k\u2009\u2264\u20092000).", "output_spec": "Print a single integer \u2014 the number of strings of the described type modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["1 1 1", "5 2 4"], "sample_outputs": ["1", "2"], "notes": "NoteIn the first sample only one string is valid: \"a\" (let's denote the only letter of our alphabet as \"a\").In the second sample (if we denote the alphabet letters as \"a\" and \"b\") the following strings are valid: \"aaaaa\" and \"bbbbb\"."}, "src_uid": "1f9107e8d1d8aebb1f4a1707a6cdeb6d"}
{"nl": {"description": "You can find anything whatsoever in our Galaxy! A cubical planet goes round an icosahedral star. Let us introduce a system of axes so that the edges of the cubical planet are parallel to the coordinate axes and two opposite vertices lay in the points (0,\u20090,\u20090) and (1,\u20091,\u20091). Two flies live on the planet. At the moment they are sitting on two different vertices of the cubical planet. Your task is to determine whether they see each other or not. The flies see each other when the vertices they occupy lie on the same face of the cube.", "input_spec": "The first line contains three space-separated integers (0 or 1) \u2014 the coordinates of the first fly, the second line analogously contains the coordinates of the second fly.", "output_spec": "Output \"YES\" (without quotes) if the flies see each other. Otherwise, output \"NO\".", "sample_inputs": ["0 0 0\n0 1 0", "1 1 0\n0 1 0", "0 0 0\n1 1 1"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "91c9dbbceb467d5fd420e92c2919ecb6"}
{"nl": {"description": "Grigoriy, like the hero of one famous comedy film, found a job as a night security guard at the museum. At first night he received embosser and was to take stock of the whole exposition.Embosser is a special devise that allows to \"print\" the text of a plastic tape. Text is printed sequentially, character by character. The device consists of a wheel with a lowercase English letters written in a circle, static pointer to the current letter and a button that print the chosen letter. At one move it's allowed to rotate the alphabetic wheel one step clockwise or counterclockwise. Initially, static pointer points to letter 'a'. Other letters are located as shown on the picture:  After Grigoriy add new item to the base he has to print its name on the plastic tape and attach it to the corresponding exhibit. It's not required to return the wheel to its initial position with pointer on the letter 'a'.Our hero is afraid that some exhibits may become alive and start to attack him, so he wants to print the names as fast as possible. Help him, for the given string find the minimum number of rotations of the wheel required to print it.", "input_spec": "The only line of input contains the name of some exhibit\u00a0\u2014 the non-empty string consisting of no more than 100 characters. It's guaranteed that the string consists of only lowercase English letters.", "output_spec": "Print one integer\u00a0\u2014 the minimum number of rotations of the wheel, required to print the name given in the input.", "sample_inputs": ["zeus", "map", "ares"], "sample_outputs": ["18", "35", "34"], "notes": "Note\u00a0  To print the string from the first sample it would be optimal to perform the following sequence of rotations:   from 'a' to 'z' (1 rotation counterclockwise),  from 'z' to 'e' (5 clockwise rotations),  from 'e' to 'u' (10 rotations counterclockwise),  from 'u' to 's' (2 counterclockwise rotations).  In total, 1\u2009+\u20095\u2009+\u200910\u2009+\u20092\u2009=\u200918 rotations are required."}, "src_uid": "ecc890b3bdb9456441a2a265c60722dd"}
{"nl": {"description": "Petya has equal wooden bars of length n. He wants to make a frame for two equal doors. Each frame has two vertical (left and right) sides of length a and one top side of length b. A solid (i.e. continuous without breaks) piece of bar is needed for each side.Determine a minimal number of wooden bars which are needed to make the frames for two doors. Petya can cut the wooden bars into any parts, but each side of each door should be a solid piece of a wooden bar (or a whole wooden bar).", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091\u2009000) \u2014 the length of each wooden bar. The second line contains a single integer a (1\u2009\u2264\u2009a\u2009\u2264\u2009n) \u2014 the length of the vertical (left and right) sides of a door frame. The third line contains a single integer b (1\u2009\u2264\u2009b\u2009\u2264\u2009n) \u2014 the length of the upper side of a door frame.", "output_spec": "Print the minimal number of wooden bars with length n which are needed to make the frames for two doors.", "sample_inputs": ["8\n1\n2", "5\n3\n4", "6\n4\n2", "20\n5\n6"], "sample_outputs": ["1", "6", "4", "2"], "notes": "NoteIn the first example one wooden bar is enough, since the total length of all six sides of the frames for two doors is 8.In the second example 6 wooden bars is enough, because for each side of the frames the new wooden bar is needed."}, "src_uid": "1a50fe39e18f86adac790093e195979a"}
{"nl": {"description": "HAII HAS A TUXGIMMEH TUXI HAS A FOO ITS 0I HAS A BAR ITS 0I HAS A BAZ ITS 0I HAS A QUZ ITS 1TUX IS NOW A NUMBRIM IN YR LOOP NERFIN YR TUX TIL BOTH SAEM TUX AN 0I HAS A PURGIMMEH PURPUR IS NOW A NUMBRFOO R SUM OF FOO AN PURBAR R SUM OF BAR AN 1BOTH SAEM BIGGR OF PRODUKT OF FOO AN QUZ AN PRODUKT OF BAR BAZ AN PRODUKT OF FOO AN QUZO RLY?YA RLYBAZ R FOOQUZ R BAROICIM OUTTA YR LOOPBAZ IS NOW A NUMBARVISIBLE SMOOSH QUOSHUNT OF BAZ QUZKTHXBYE", "input_spec": "The input contains between 1 and 10 lines, i-th line contains an integer number xi (0\u2009\u2264\u2009xi\u2009\u2264\u20099).", "output_spec": "Output a single real number. The answer is considered to be correct if its absolute or relative error does not exceed 10\u2009-\u20094.", "sample_inputs": ["3\n0\n1\n1"], "sample_outputs": ["0.666667"], "notes": null}, "src_uid": "32fc378a310ca15598377f7b638eaf26"}
{"nl": {"description": "\"Contestant who earns a score equal to or greater than the k-th place finisher's score will advance to the next round, as long as the contestant earns a positive score...\" \u2014 an excerpt from contest rules.A total of n participants took part in the contest (n\u2009\u2265\u2009k), and you already know their scores. Calculate how many participants will advance to the next round.", "input_spec": "The first line of the input contains two integers n and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u200950) separated by a single space. The second line contains n space-separated integers a1,\u2009a2,\u2009...,\u2009an (0\u2009\u2264\u2009ai\u2009\u2264\u2009100), where ai is the score earned by the participant who got the i-th place. The given sequence is non-increasing (that is, for all i from 1 to n\u2009-\u20091 the following condition is fulfilled: ai\u2009\u2265\u2009ai\u2009+\u20091).", "output_spec": "Output the number of participants who advance to the next round.", "sample_inputs": ["8 5\n10 9 8 7 7 7 5 5", "4 2\n0 0 0 0"], "sample_outputs": ["6", "0"], "notes": "NoteIn the first example the participant on the 5th place earned 7 points. As the participant on the 6th place also earned 7 points, there are 6 advancers.In the second example nobody got a positive score."}, "src_uid": "193ec1226ffe07522caf63e84a7d007f"}
{"nl": {"description": "Life in Bertown has become hard. The city has too many roads and the government spends too much to maintain them. There are n junctions and m two way roads, at which one can get from each junction to any other one. The mayor wants to close some roads so that the number of roads left totaled to n\u2009-\u20091 roads and it were still possible to get from each junction to any other one. Besides, the mayor is concerned with the number of dead ends which are the junctions from which only one road goes. There shouldn't be too many or too few junctions. Having discussed the problem, the mayor and his assistants decided that after the roads are closed, the road map should contain exactly k dead ends. Your task is to count the number of different ways of closing the roads at which the following conditions are met:   There are exactly n\u2009-\u20091 roads left.  It is possible to get from each junction to any other one.  There are exactly k dead ends on the resulting map. Two ways are considered different if there is a road that is closed in the first way, and is open in the second one.", "input_spec": "The first line contains three integers n, m and k (3\u2009\u2264\u2009n\u2009\u2264\u200910,\u2009n\u2009-\u20091\u2009\u2264\u2009m\u2009\u2264\u2009n\u00b7(n\u2009-\u20091)\u2009/\u20092,\u20092\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009-\u20091) which represent the number of junctions, roads and dead ends correspondingly. Then follow m lines each containing two different integers v1 and v2 (1\u2009\u2264\u2009v1,\u2009v2\u2009\u2264\u2009n,\u2009v1\u2009\u2260\u2009v2) which represent the number of junctions connected by another road. There can be no more than one road between every pair of junctions. The junctions are numbered with integers from 1 to n. It is guaranteed that it is possible to get from each junction to any other one along the original roads.", "output_spec": "Print a single number \u2014 the required number of ways.", "sample_inputs": ["3 3 2\n1 2\n2 3\n1 3", "4 6 2\n1 2\n2 3\n3 4\n4 1\n1 3\n2 4", "4 6 3\n1 2\n2 3\n3 4\n4 1\n1 3\n2 4"], "sample_outputs": ["3", "12", "4"], "notes": null}, "src_uid": "8087605a8f316150372cc4627f26231d"}
{"nl": {"description": "You are given a chessboard of size 1\u2009\u00d7\u2009n. It is guaranteed that n is even. The chessboard is painted like this: \"BWBW...BW\".Some cells of the board are occupied by the chess pieces. Each cell contains no more than one chess piece. It is known that the total number of pieces equals to .In one step you can move one of the pieces one cell to the left or to the right. You cannot move pieces beyond the borders of the board. You also cannot move pieces to the cells that are already occupied.Your task is to place all the pieces in the cells of the same color using the minimum number of moves (all the pieces must occupy only the black cells or only the white cells after all the moves are made).", "input_spec": "The first line of the input contains one integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100, n is even) \u2014 the size of the chessboard.  The second line of the input contains  integer numbers  (1\u2009\u2264\u2009pi\u2009\u2264\u2009n) \u2014 initial positions of the pieces. It is guaranteed that all the positions are distinct.", "output_spec": "Print one integer \u2014 the minimum number of moves you have to make to place all the pieces in the cells of the same color.", "sample_inputs": ["6\n1 2 6", "10\n1 2 3 4 5"], "sample_outputs": ["2", "10"], "notes": "NoteIn the first example the only possible strategy is to move the piece at the position 6 to the position 5 and move the piece at the position 2 to the position 3. Notice that if you decide to place the pieces in the white cells the minimum number of moves will be 3.In the second example the possible strategy is to move  in 4 moves, then  in 3 moves,  in 2 moves and  in 1 move."}, "src_uid": "0efe9afd8e6be9e00f7949be93f0ca1a"}
{"nl": {"description": "The numbers of all offices in the new building of the Tax Office of IT City will have lucky numbers.Lucky number is a number that consists of digits 7 and 8 only. Find the maximum number of offices in the new building of the Tax Office given that a door-plate can hold a number not longer than n digits.", "input_spec": "The only line of input contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u200955) \u2014 the maximum length of a number that a door-plate can hold.", "output_spec": "Output one integer \u2014 the maximum number of offices, than can have unique lucky numbers not longer than n digits.", "sample_inputs": ["2"], "sample_outputs": ["6"], "notes": null}, "src_uid": "f1b43baa14d4c262ba616d892525dfde"}
{"nl": {"description": "There is an infinite board of square tiles. Initially all tiles are white.Vova has a red marker and a blue marker. Red marker can color $$$a$$$ tiles. Blue marker can color $$$b$$$ tiles. If some tile isn't white then you can't use marker of any color on it. Each marker must be drained completely, so at the end there should be exactly $$$a$$$ red tiles and exactly $$$b$$$ blue tiles across the board.Vova wants to color such a set of tiles that:  they would form a rectangle, consisting of exactly $$$a+b$$$ colored tiles;  all tiles of at least one color would also form a rectangle. Here are some examples of correct colorings:  Here are some examples of incorrect colorings:  Among all correct colorings Vova wants to choose the one with the minimal perimeter. What is the minimal perimeter Vova can obtain?It is guaranteed that there exists at least one correct coloring.", "input_spec": "A single line contains two integers $$$a$$$ and $$$b$$$ ($$$1 \\le a, b \\le 10^{14}$$$) \u2014 the number of tiles red marker should color and the number of tiles blue marker should color, respectively.", "output_spec": "Print a single integer \u2014 the minimal perimeter of a colored rectangle Vova can obtain by coloring exactly $$$a$$$ tiles red and exactly $$$b$$$ tiles blue. It is guaranteed that there exists at least one correct coloring.", "sample_inputs": ["4 4", "3 9", "9 3", "3 6", "506 2708"], "sample_outputs": ["12", "14", "14", "12", "3218"], "notes": "NoteThe first four examples correspond to the first picture of the statement.Note that for there exist multiple correct colorings for all of the examples.In the first example you can also make a rectangle with sides $$$1$$$ and $$$8$$$, though its perimeter will be $$$18$$$ which is greater than $$$8$$$.In the second example you can make the same resulting rectangle with sides $$$3$$$ and $$$4$$$, but red tiles will form the rectangle with sides $$$1$$$ and $$$3$$$ and blue tiles will form the rectangle with sides $$$3$$$ and $$$3$$$."}, "src_uid": "7d0c5f77bca792b6ab4fd4088fe18ff1"}
{"nl": {"description": "You are given two strings $$$s$$$ and $$$t$$$ consisting of lowercase Latin letters. The length of $$$t$$$ is $$$2$$$ (i.e. this string consists only of two characters).In one move, you can choose any character of $$$s$$$ and replace it with any lowercase Latin letter. More formally, you choose some $$$i$$$ and replace $$$s_i$$$ (the character at the position $$$i$$$) with some character from 'a' to 'z'.You want to do no more than $$$k$$$ replacements in such a way that maximizes the number of occurrences of $$$t$$$ in $$$s$$$ as a subsequence.Recall that a subsequence is a sequence that can be derived from the given sequence by deleting zero or more elements without changing the order of the remaining elements.", "input_spec": "The first line of the input contains two integers $$$n$$$ and $$$k$$$ ($$$2 \\le n \\le 200$$$; $$$0 \\le k \\le n$$$) \u2014 the length of $$$s$$$ and the maximum number of moves you can make. The second line of the input contains the string $$$s$$$ consisting of $$$n$$$ lowercase Latin letters. The third line of the input contains the string $$$t$$$ consisting of two lowercase Latin letters.", "output_spec": "Print one integer \u2014 the maximum possible number of occurrences of $$$t$$$ in $$$s$$$ as a subsequence if you replace no more than $$$k$$$ characters in $$$s$$$ optimally.", "sample_inputs": ["4 2\nbbaa\nab", "7 3\nasddsaf\nsd", "15 6\nqwertyhgfdsazxc\nqa", "7 2\nabacaba\naa"], "sample_outputs": ["3", "10", "16", "15"], "notes": "NoteIn the first example, you can obtain the string \"abab\" replacing $$$s_1$$$ with 'a' and $$$s_4$$$ with 'b'. Then the answer is $$$3$$$.In the second example, you can obtain the string \"ssddsdd\" and get the answer $$$10$$$.In the fourth example, you can obtain the string \"aaacaaa\" and get the answer $$$15$$$."}, "src_uid": "9c700390ac13942cbde7c3428965b18a"}
{"nl": {"description": "Vasya likes to solve equations. Today he wants to solve $$$(x~\\mathrm{div}~k) \\cdot (x \\bmod k) = n$$$, where $$$\\mathrm{div}$$$ and $$$\\mathrm{mod}$$$ stand for integer division and modulo operations (refer to the Notes below for exact definition). In this equation, $$$k$$$ and $$$n$$$ are positive integer parameters, and $$$x$$$ is a positive integer unknown. If there are several solutions, Vasya wants to find the smallest possible $$$x$$$. Can you help him?", "input_spec": "The first line contains two integers $$$n$$$ and $$$k$$$ ($$$1 \\leq n \\leq 10^6$$$, $$$2 \\leq k \\leq 1000$$$).", "output_spec": "Print a single integer $$$x$$$\u00a0\u2014 the smallest positive integer solution to $$$(x~\\mathrm{div}~k) \\cdot (x \\bmod k) = n$$$. It is guaranteed that this equation has at least one positive integer solution.", "sample_inputs": ["6 3", "1 2", "4 6"], "sample_outputs": ["11", "3", "10"], "notes": "NoteThe result of integer division $$$a~\\mathrm{div}~b$$$ is equal to the largest integer $$$c$$$ such that $$$b \\cdot c \\leq a$$$. $$$a$$$ modulo $$$b$$$ (shortened $$$a \\bmod b$$$) is the only integer $$$c$$$ such that $$$0 \\leq c < b$$$, and $$$a - c$$$ is divisible by $$$b$$$.In the first sample, $$$11~\\mathrm{div}~3 = 3$$$ and $$$11 \\bmod 3 = 2$$$. Since $$$3 \\cdot 2 = 6$$$, then $$$x = 11$$$ is a solution to $$$(x~\\mathrm{div}~3) \\cdot (x \\bmod 3) = 6$$$. One can see that $$$19$$$ is the only other positive integer solution, hence $$$11$$$ is the smallest one."}, "src_uid": "ed0ebc1e484fcaea875355b5b7944c57"}
{"nl": {"description": "A renowned abstract artist Sasha, drawing inspiration from nowhere, decided to paint a picture entitled \"Special Olympics\". He justly thought that, if the regular Olympic games have five rings, then the Special ones will do with exactly two rings just fine.Let us remind you that a ring is a region located between two concentric circles with radii r and R (r\u2009<\u2009R). These radii are called internal and external, respectively. Concentric circles are circles with centers located at the same point.Soon a white canvas, which can be considered as an infinite Cartesian plane, had two perfect rings, painted with solid black paint. As Sasha is very impulsive, the rings could have different radii and sizes, they intersect and overlap with each other in any way. We know only one thing for sure: the centers of the pair of rings are not the same.When Sasha got tired and fell into a deep sleep, a girl called Ilona came into the room and wanted to cut a circle for the sake of good memories. To make the circle beautiful, she decided to cut along the contour.We'll consider a contour to be a continuous closed line through which there is transition from one color to another (see notes for clarification). If the contour takes the form of a circle, then the result will be cutting out a circle, which Iona wants.But the girl's inquisitive mathematical mind does not rest: how many ways are there to cut a circle out of the canvas?", "input_spec": "The input contains two lines.  Each line has four space-separated integers xi, yi, ri, Ri, that describe the i-th ring; xi and yi are coordinates of the ring's center, ri and Ri are the internal and external radii of the ring correspondingly (\u2009-\u2009100\u2009\u2264\u2009xi,\u2009yi\u2009\u2264\u2009100;\u00a01\u2009\u2264\u2009ri\u2009<\u2009Ri\u2009\u2264\u2009100).  It is guaranteed that the centers of the rings do not coinside.", "output_spec": "A single integer \u2014 the number of ways to cut out a circle from the canvas.", "sample_inputs": ["60 60 45 55\n80 80 8 32", "60 60 45 55\n80 60 15 25", "50 50 35 45\n90 50 35 45"], "sample_outputs": ["1", "4", "0"], "notes": "NoteFigures for test samples are given below. The possible cuts are marked with red dotted line.     "}, "src_uid": "4c2865e4742a29460ca64860740b84f4"}
{"nl": {"description": "Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.Petya calls a mask of a positive integer n the number that is obtained after successive writing of all lucky digits of number n from the left to the right. For example, the mask of number 72174994 is number 7744, the mask of 7 is 7, the mask of 9999047 is 47. Obviously, mask of any number is always a lucky number.Petya has two numbers \u2014 an arbitrary integer a and a lucky number b. Help him find the minimum number c (c\u2009>\u2009a) such that the mask of number c equals b.", "input_spec": "The only line contains two integers a and b (1\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009105). It is guaranteed that number b is lucky.", "output_spec": "In the only line print a single number \u2014 the number c that is sought by Petya.", "sample_inputs": ["1 7", "100 47"], "sample_outputs": ["7", "147"], "notes": null}, "src_uid": "e5e4ea7a5bf785e059e10407b25d73fb"}
{"nl": {"description": "Polycarp plays \"Game 23\". Initially he has a number $$$n$$$ and his goal is to transform it to $$$m$$$. In one move, he can multiply $$$n$$$ by $$$2$$$ or multiply $$$n$$$ by $$$3$$$. He can perform any number of moves.Print the number of moves needed to transform $$$n$$$ to $$$m$$$. Print -1 if it is impossible to do so.It is easy to prove that any way to transform $$$n$$$ to $$$m$$$ contains the same number of moves (i.e. number of moves doesn't depend on the way of transformation).", "input_spec": "The only line of the input contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n \\le m \\le 5\\cdot10^8$$$).", "output_spec": "Print the number of moves to transform $$$n$$$ to $$$m$$$, or -1 if there is no solution.", "sample_inputs": ["120 51840", "42 42", "48 72"], "sample_outputs": ["7", "0", "-1"], "notes": "NoteIn the first example, the possible sequence of moves is: $$$120 \\rightarrow 240 \\rightarrow 720 \\rightarrow 1440 \\rightarrow 4320 \\rightarrow 12960 \\rightarrow 25920 \\rightarrow 51840.$$$ The are $$$7$$$ steps in total.In the second example, no moves are needed. Thus, the answer is $$$0$$$.In the third example, it is impossible to transform $$$48$$$ to $$$72$$$."}, "src_uid": "3f9980ad292185f63a80bce10705e806"}
{"nl": {"description": "\"This problem is rubbish! There is not statement, and there are only 5 test cases. The problemsetter took liberties with this problem!\" \u2014 people complained in the comments to one round on Codeforces. And even more... No, wait, the checker for the problem was alright, that's a mercy.", "input_spec": "The only line of the input contains an integer between 1 and 5, inclusive. All tests for this problem are different. The contents of the test case doesn't need to be equal to its index.", "output_spec": "The only line of the output contains an integer between 1 and 3, inclusive.", "sample_inputs": [], "sample_outputs": [], "notes": "NoteThis problem has no samples, since there so few test cases."}, "src_uid": "c702e07fed684b7741d8337aafa005fb"}
{"nl": {"description": "Reziba has many magic gems. Each magic gem can be split into $$$M$$$ normal gems. The amount of space each magic (and normal) gem takes is $$$1$$$ unit. A normal gem cannot be split.Reziba wants to choose a set of magic gems and split some of them, so the total space occupied by the resulting set of gems is $$$N$$$ units. If a magic gem is chosen and split, it takes $$$M$$$ units of space (since it is split into $$$M$$$ gems); if a magic gem is not split, it takes $$$1$$$ unit.How many different configurations of the resulting set of gems can Reziba have, such that the total amount of space taken is $$$N$$$ units? Print the answer modulo $$$1000000007$$$ ($$$10^9+7$$$). Two configurations are considered different if the number of magic gems Reziba takes to form them differs, or the indices of gems Reziba has to split differ.", "input_spec": "The input contains a single line consisting of $$$2$$$ integers $$$N$$$ and $$$M$$$ ($$$1 \\le N \\le 10^{18}$$$, $$$2 \\le M \\le 100$$$).", "output_spec": "Print one integer, the total number of configurations of the resulting set of gems, given that the total amount of space taken is $$$N$$$ units. Print the answer modulo $$$1000000007$$$ ($$$10^9+7$$$).", "sample_inputs": ["4 2", "3 2"], "sample_outputs": ["5", "3"], "notes": "NoteIn the first example each magic gem can split into $$$2$$$ normal gems, and we know that the total amount of gems are $$$4$$$.Let $$$1$$$ denote a magic gem, and $$$0$$$ denote a normal gem.The total configurations you can have is:   $$$1 1 1 1$$$ (None of the gems split);  $$$0 0 1 1$$$ (First magic gem splits into $$$2$$$ normal gems);  $$$1 0 0 1$$$ (Second magic gem splits into $$$2$$$ normal gems);  $$$1 1 0 0$$$ (Third magic gem splits into $$$2$$$ normal gems);  $$$0 0 0 0$$$ (First and second magic gems split into total $$$4$$$ normal gems). Hence, answer is $$$5$$$."}, "src_uid": "e7b9eec21d950f5d963ff50619c6f119"}
{"nl": {"description": "You are given a complete undirected graph. For each pair of vertices you are given the length of the edge that connects them. Find the shortest paths between each pair of vertices in the graph and return the length of the longest of them.", "input_spec": "The first line of the input contains a single integer N (3\u2009\u2264\u2009N\u2009\u2264\u200910). The following N lines each contain N space-separated integers. jth integer in ith line aij is the length of the edge that connects vertices i and j. aij\u2009=\u2009aji, aii\u2009=\u20090, 1\u2009\u2264\u2009aij\u2009\u2264\u2009100 for i\u2009\u2260\u2009j.", "output_spec": "Output the maximum length of the shortest path between any pair of vertices in the graph.", "sample_inputs": ["3\n0 1 1\n1 0 4\n1 4 0", "4\n0 1 2 3\n1 0 4 5\n2 4 0 6\n3 5 6 0"], "sample_outputs": ["2", "5"], "notes": "NoteYou're running short of keywords, so you can't use some of them:definedoforforeachwhilerepeatuntilifthenelseelifelsifelseifcaseswitch"}, "src_uid": "bbd210065f8b32de048a2d9b1b033ed5"}
{"nl": {"description": "Vitaly is a very weird man. He's got two favorite digits a and b. Vitaly calls a positive integer good, if the decimal representation of this integer only contains digits a and b. Vitaly calls a good number excellent, if the sum of its digits is a good number.For example, let's say that Vitaly's favourite digits are 1 and 3, then number 12 isn't good and numbers 13 or 311 are. Also, number 111 is excellent and number 11 isn't. Now Vitaly is wondering, how many excellent numbers of length exactly n are there. As this number can be rather large, he asks you to count the remainder after dividing it by 1000000007 (109\u2009+\u20097).A number's length is the number of digits in its decimal representation without leading zeroes.", "input_spec": "The first line contains three integers: a, b, n (1\u2009\u2264\u2009a\u2009<\u2009b\u2009\u2264\u20099,\u20091\u2009\u2264\u2009n\u2009\u2264\u2009106).", "output_spec": "Print a single integer \u2014 the answer to the problem modulo 1000000007 (109\u2009+\u20097).", "sample_inputs": ["1 3 3", "2 3 10"], "sample_outputs": ["1", "165"], "notes": null}, "src_uid": "d3e3da5b6ba37c8ac5f22b18c140ce81"}
{"nl": {"description": "One industrial factory is reforming working plan. The director suggested to set a mythical detail production norm. If at the beginning of the day there were x details in the factory storage, then by the end of the day the factory has to produce  (remainder after dividing x by m) more details. Unfortunately, no customer has ever bought any mythical detail, so all the details produced stay on the factory. The board of directors are worried that the production by the given plan may eventually stop (that means that there will be \u0430 moment when the current number of details on the factory is divisible by m). Given the number of details a on the first day and number m check if the production stops at some moment.", "input_spec": "The first line contains two integers a and m (1\u2009\u2264\u2009a,\u2009m\u2009\u2264\u2009105).", "output_spec": "Print \"Yes\" (without quotes) if the production will eventually stop, otherwise print \"No\".", "sample_inputs": ["1 5", "3 6"], "sample_outputs": ["No", "Yes"], "notes": null}, "src_uid": "f726133018e2149ec57e113860ec498a"}
{"nl": {"description": "Ilya is a very clever lion, he lives in an unusual city ZooVille. In this city all the animals have their rights and obligations. Moreover, they even have their own bank accounts. The state of a bank account is an integer. The state of a bank account can be a negative number. This means that the owner of the account owes the bank money.Ilya the Lion has recently had a birthday, so he got a lot of gifts. One of them (the gift of the main ZooVille bank) is the opportunity to delete the last digit or the digit before last from the state of his bank account no more than once. For example, if the state of Ilya's bank account is -123, then Ilya can delete the last digit and get his account balance equal to -12, also he can remove its digit before last and get the account balance equal to -13. Of course, Ilya is permitted not to use the opportunity to delete a digit from the balance.Ilya is not very good at math, and that's why he asks you to help him maximize his bank account. Find the maximum state of the bank account that can be obtained using the bank's gift.", "input_spec": "The single line contains integer n (10\u2009\u2264\u2009|n|\u2009\u2264\u2009109) \u2014 the state of Ilya's bank account.", "output_spec": "In a single line print an integer \u2014 the maximum state of the bank account that Ilya can get. ", "sample_inputs": ["2230", "-10", "-100003"], "sample_outputs": ["2230", "0", "-10000"], "notes": "NoteIn the first test sample Ilya doesn't profit from using the present.In the second test sample you can delete digit 1 and get the state of the account equal to 0."}, "src_uid": "4b0a8798a6d53351226d4f06e3356b1e"}
{"nl": {"description": "InputThe only line of the input contains a string of digits. The length of the string is between 1 and 10, inclusive.OutputOutput \"Yes\" or \"No\".ExamplesInput373OutputYesInput121OutputNoInput436OutputYes", "input_spec": "The only line of the input contains a string of digits. The length of the string is between 1 and 10, inclusive.", "output_spec": "Output \"Yes\" or \"No\".", "sample_inputs": ["373", "121", "436"], "sample_outputs": ["Yes", "No", "Yes"], "notes": null}, "src_uid": "0f11f41cefd7cf43f498e511405426c3"}
{"nl": {"description": "One day Misha and Andrew were playing a very simple game. First, each player chooses an integer in the range from 1 to n. Let's assume that Misha chose number m, and Andrew chose number a.Then, by using a random generator they choose a random integer c in the range between 1 and n (any integer from 1 to n is chosen with the same probability), after which the winner is the player, whose number was closer to c. The boys agreed that if m and a are located on the same distance from c, Misha wins.Andrew wants to win very much, so he asks you to help him. You know the number selected by Misha, and number n. You need to determine which value of a Andrew must choose, so that the probability of his victory is the highest possible.More formally, you need to find such integer a (1\u2009\u2264\u2009a\u2009\u2264\u2009n), that the probability that  is maximal, where c is the equiprobably chosen integer from 1 to n (inclusive).", "input_spec": "The first line contains two integers n and m (1\u2009\u2264\u2009m\u2009\u2264\u2009n\u2009\u2264\u2009109) \u2014 the range of numbers in the game, and the number selected by Misha respectively.", "output_spec": "Print a single number \u2014 such value a, that probability that Andrew wins is the highest. If there are multiple such values, print the minimum of them.", "sample_inputs": ["3 1", "4 3"], "sample_outputs": ["2", "2"], "notes": "NoteIn the first sample test: Andrew wins if c is equal to 2 or 3. The probability that Andrew wins is 2\u2009/\u20093. If Andrew chooses a\u2009=\u20093, the probability of winning will be 1\u2009/\u20093. If a\u2009=\u20091, the probability of winning is 0.In the second sample test: Andrew wins if c is equal to 1 and 2. The probability that Andrew wins is 1\u2009/\u20092. For other choices of a the probability of winning is less."}, "src_uid": "f6a80c0f474cae1e201032e1df10e9f7"}
{"nl": {"description": "Little girl Tanya is learning how to decrease a number by one, but she does it wrong with a number consisting of two or more digits. Tanya subtracts one from a number by the following algorithm:  if the last digit of the number is non-zero, she decreases the number by one;  if the last digit of the number is zero, she divides the number by 10 (i.e. removes the last digit). You are given an integer number $$$n$$$. Tanya will subtract one from it $$$k$$$ times. Your task is to print the result after all $$$k$$$ subtractions.It is guaranteed that the result will be positive integer number.", "input_spec": "The first line of the input contains two integer numbers $$$n$$$ and $$$k$$$ ($$$2 \\le n \\le 10^9$$$, $$$1 \\le k \\le 50$$$) \u2014 the number from which Tanya will subtract and the number of subtractions correspondingly.", "output_spec": "Print one integer number \u2014 the result of the decreasing $$$n$$$ by one $$$k$$$ times. It is guaranteed that the result will be positive integer number. ", "sample_inputs": ["512 4", "1000000000 9"], "sample_outputs": ["50", "1"], "notes": "NoteThe first example corresponds to the following sequence: $$$512 \\rightarrow 511 \\rightarrow 510 \\rightarrow 51 \\rightarrow 50$$$."}, "src_uid": "064162604284ce252b88050b4174ba55"}
{"nl": {"description": "Not so long ago company R2 bought company R1 and consequently, all its developments in the field of multicore processors. Now the R2 laboratory is testing one of the R1 processors.The testing goes in n steps, at each step the processor gets some instructions, and then its temperature is measured. The head engineer in R2 is keeping a report record on the work of the processor: he writes down the minimum and the maximum measured temperature in his notebook. His assistant had to write down all temperatures into his notebook, but (for unknown reasons) he recorded only m.The next day, the engineer's assistant filed in a report with all the m temperatures. However, the chief engineer doubts that the assistant wrote down everything correctly (naturally, the chief engineer doesn't doubt his notes). So he asked you to help him. Given numbers n, m, min, max and the list of m temperatures determine whether you can upgrade the set of m temperatures to the set of n temperatures (that is add n\u2009-\u2009m temperatures), so that the minimum temperature was min and the maximum one was max.", "input_spec": "The first line contains four integers n,\u2009m,\u2009min,\u2009max (1\u2009\u2264\u2009m\u2009<\u2009n\u2009\u2264\u2009100;\u00a01\u2009\u2264\u2009min\u2009<\u2009max\u2009\u2264\u2009100). The second line contains m space-separated integers ti (1\u2009\u2264\u2009ti\u2009\u2264\u2009100) \u2014 the temperatures reported by the assistant. Note, that the reported temperatures, and the temperatures you want to add can contain equal temperatures.", "output_spec": "If the data is consistent, print 'Correct' (without the quotes). Otherwise, print 'Incorrect' (without the quotes).", "sample_inputs": ["2 1 1 2\n1", "3 1 1 3\n2", "2 1 1 3\n2"], "sample_outputs": ["Correct", "Correct", "Incorrect"], "notes": "NoteIn the first test sample one of the possible initial configurations of temperatures is [1, 2].In the second test sample one of the possible initial configurations of temperatures is [2, 1, 3].In the third test sample it is impossible to add one temperature to obtain the minimum equal to 1 and the maximum equal to 3."}, "src_uid": "99f9cdc85010bd89434f39b78f15b65e"}
{"nl": {"description": "You are given a sequence a consisting of n integers. You may partition this sequence into two sequences b and c in such a way that every element belongs exactly to one of these sequences. Let B be the sum of elements belonging to b, and C be the sum of elements belonging to c (if some of these sequences is empty, then its sum is 0). What is the maximum possible value of B\u2009-\u2009C?", "input_spec": "The first line contains one integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009100) \u2014 the number of elements in a. The second line contains n integers a1, a2, ..., an (\u2009-\u2009100\u2009\u2264\u2009ai\u2009\u2264\u2009100) \u2014 the elements of sequence a.", "output_spec": "Print the maximum possible value of B\u2009-\u2009C, where B is the sum of elements of sequence b, and C is the sum of elements of sequence c.", "sample_inputs": ["3\n1 -2 0", "6\n16 23 16 15 42 8"], "sample_outputs": ["3", "120"], "notes": "NoteIn the first example we may choose b\u2009=\u2009{1,\u20090}, c\u2009=\u2009{\u2009-\u20092}. Then B\u2009=\u20091, C\u2009=\u2009\u2009-\u20092, B\u2009-\u2009C\u2009=\u20093.In the second example we choose b\u2009=\u2009{16,\u200923,\u200916,\u200915,\u200942,\u20098}, c\u2009=\u2009{} (an empty sequence). Then B\u2009=\u2009120, C\u2009=\u20090, B\u2009-\u2009C\u2009=\u2009120."}, "src_uid": "4b5d14833f9b51bfd336cc0e661243a5"}
{"nl": {"description": "Little Elephant loves magic squares very much.A magic square is a 3\u2009\u00d7\u20093 table, each cell contains some positive integer. At that the sums of integers in all rows, columns and diagonals of the table are equal. The figure below shows the magic square, the sum of integers in all its rows, columns and diagonals equals 15.  The Little Elephant remembered one magic square. He started writing this square on a piece of paper, but as he wrote, he forgot all three elements of the main diagonal of the magic square. Fortunately, the Little Elephant clearly remembered that all elements of the magic square did not exceed 105. Help the Little Elephant, restore the original magic square, given the Elephant's notes.", "input_spec": "The first three lines of the input contain the Little Elephant's notes. The first line contains elements of the first row of the magic square. The second line contains the elements of the second row, the third line is for the third row. The main diagonal elements that have been forgotten by the Elephant are represented by zeroes. It is guaranteed that the notes contain exactly three zeroes and they are all located on the main diagonal. It is guaranteed that all positive numbers in the table do not exceed 105.", "output_spec": "Print three lines, in each line print three integers \u2014 the Little Elephant's magic square. If there are multiple magic squares, you are allowed to print any of them. Note that all numbers you print must be positive and not exceed 105. It is guaranteed that there exists at least one magic square that meets the conditions.", "sample_inputs": ["0 1 1\n1 0 1\n1 1 0", "0 3 6\n5 0 5\n4 7 0"], "sample_outputs": ["1 1 1\n1 1 1\n1 1 1", "6 3 6\n5 5 5\n4 7 4"], "notes": null}, "src_uid": "0c42eafb73d1e30f168958a06a0f9bca"}
{"nl": {"description": "You stumbled upon a new kind of chess puzzles. The chessboard you are given is not necesserily $$$8 \\times 8$$$, but it still is $$$N \\times N$$$. Each square has some number written on it, all the numbers are from $$$1$$$ to $$$N^2$$$ and all the numbers are pairwise distinct. The $$$j$$$-th square in the $$$i$$$-th row has a number $$$A_{ij}$$$ written on it.In your chess set you have only three pieces: a knight, a bishop and a rook. At first, you put one of them on the square with the number $$$1$$$ (you can choose which one). Then you want to reach square $$$2$$$ (possibly passing through some other squares in process), then square $$$3$$$ and so on until you reach square $$$N^2$$$. In one step you are allowed to either make a valid move with the current piece or replace it with some other piece. Each square can be visited arbitrary number of times.A knight can move to a square that is two squares away horizontally and one square vertically, or two squares vertically and one square horizontally. A bishop moves diagonally. A rook moves horizontally or vertically. The move should be performed to a different square from the one a piece is currently standing on.You want to minimize the number of steps of the whole traversal. Among all the paths to have the same number of steps you want to choose the one with the lowest number of piece replacements.What is the path you should take to satisfy all conditions?", "input_spec": "The first line contains a single integer $$$N$$$ ($$$3 \\le N \\le 10$$$) \u2014 the size of the chessboard. Each of the next $$$N$$$ lines contains $$$N$$$ integers $$$A_{i1}, A_{i2}, \\dots, A_{iN}$$$ ($$$1 \\le A_{ij} \\le N^2$$$) \u2014 the numbers written on the squares of the $$$i$$$-th row of the board. It is guaranteed that all $$$A_{ij}$$$ are pairwise distinct.", "output_spec": "The only line should contain two integers \u2014 the number of steps in the best answer and the number of replacement moves in it.", "sample_inputs": ["3\n1 9 3\n8 6 7\n4 2 5"], "sample_outputs": ["12 1"], "notes": "NoteHere are the steps for the first example (the starting piece is a knight):  Move to $$$(3, 2)$$$  Move to $$$(1, 3)$$$  Move to $$$(3, 2)$$$  Replace the knight with a rook  Move to $$$(3, 1)$$$  Move to $$$(3, 3)$$$  Move to $$$(3, 2)$$$  Move to $$$(2, 2)$$$  Move to $$$(2, 3)$$$  Move to $$$(2, 1)$$$  Move to $$$(1, 1)$$$  Move to $$$(1, 2)$$$ "}, "src_uid": "5fe44b6cd804e0766a0e993eca1846cd"}
{"nl": {"description": "You are given three integers k, pa and pb.You will construct a sequence with the following algorithm: Initially, start with the empty sequence. Each second, you do the following. With probability pa\u2009/\u2009(pa\u2009+\u2009pb), add 'a' to the end of the sequence. Otherwise (with probability pb\u2009/\u2009(pa\u2009+\u2009pb)), add 'b' to the end of the sequence.You stop once there are at least k subsequences that form 'ab'. Determine the expected number of times 'ab' is a subsequence in the resulting sequence. It can be shown that this can be represented by P\u2009/\u2009Q, where P and Q are coprime integers, and . Print the value of .", "input_spec": "The first line will contain three integers integer k,\u2009pa,\u2009pb (1\u2009\u2264\u2009k\u2009\u2264\u20091\u2009000, 1\u2009\u2264\u2009pa,\u2009pb\u2009\u2264\u20091\u2009000\u2009000).", "output_spec": "Print a single integer, the answer to the problem.", "sample_inputs": ["1 1 1", "3 1 4"], "sample_outputs": ["2", "370000006"], "notes": "NoteThe first sample, we will keep appending to our sequence until we get the subsequence 'ab' at least once. For instance, we get the sequence 'ab' with probability 1/4, 'bbab' with probability 1/16, and 'aab' with probability 1/8. Note, it's impossible for us to end with a sequence like 'aabab', since we would have stopped our algorithm once we had the prefix 'aab'. The expected amount of times that 'ab' will occur across all valid sequences is 2. For the second sample, the answer is equal to ."}, "src_uid": "0dc9f5d75143a2bc744480de859188b4"}
{"nl": {"description": "You want to arrange n integers a1,\u2009a2,\u2009...,\u2009an in some order in a row. Let's define the value of an arrangement as the sum of differences between all pairs of adjacent integers.More formally, let's denote some arrangement as a sequence of integers x1,\u2009x2,\u2009...,\u2009xn, where sequence x is a permutation of sequence a. The value of such an arrangement is (x1\u2009-\u2009x2)\u2009+\u2009(x2\u2009-\u2009x3)\u2009+\u2009...\u2009+\u2009(xn\u2009-\u20091\u2009-\u2009xn).Find the largest possible value of an arrangement. Then, output the lexicographically smallest sequence x that corresponds to an arrangement of the largest possible value.", "input_spec": "The first line of the input contains integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100). The second line contains n space-separated integers a1, a2, ..., an (|ai|\u2009\u2264\u20091000).", "output_spec": "Print the required sequence x1,\u2009x2,\u2009...,\u2009xn. Sequence x should be the lexicographically smallest permutation of a that corresponds to an arrangement of the largest possible value.", "sample_inputs": ["5\n100 -100 50 0 -50"], "sample_outputs": ["100 -50 0 50 -100"], "notes": "NoteIn the sample test case, the value of the output arrangement is (100\u2009-\u2009(\u2009-\u200950))\u2009+\u2009((\u2009-\u200950)\u2009-\u20090)\u2009+\u2009(0\u2009-\u200950)\u2009+\u2009(50\u2009-\u2009(\u2009-\u2009100))\u2009=\u2009200. No other arrangement has a larger value, and among all arrangements with the value of 200, the output arrangement is the lexicographically smallest one.Sequence x1,\u2009x2,\u2009... ,\u2009xp is lexicographically smaller than sequence y1,\u2009y2,\u2009... ,\u2009yp if there exists an integer r (0\u2009\u2264\u2009r\u2009<\u2009p) such that x1\u2009=\u2009y1,\u2009x2\u2009=\u2009y2,\u2009... ,\u2009xr\u2009=\u2009yr and xr\u2009+\u20091\u2009<\u2009yr\u2009+\u20091."}, "src_uid": "4408eba2c5c0693e6b70bdcbe2dda2f4"}
{"nl": {"description": "Arthur and Alexander are number busters. Today they've got a competition. Arthur took a group of four integers a,\u2009b,\u2009w,\u2009x (0\u2009\u2264\u2009b\u2009<\u2009w,\u20090\u2009<\u2009x\u2009<\u2009w) and Alexander took integer \u0441. Arthur and Alexander use distinct approaches to number bustings. Alexander is just a regular guy. Each second, he subtracts one from his number. In other words, he performs the assignment: c\u2009=\u2009c\u2009-\u20091. Arthur is a sophisticated guy. Each second Arthur performs a complex operation, described as follows: if b\u2009\u2265\u2009x, perform the assignment b\u2009=\u2009b\u2009-\u2009x, if b\u2009<\u2009x, then perform two consecutive assignments a\u2009=\u2009a\u2009-\u20091;\u00a0b\u2009=\u2009w\u2009-\u2009(x\u2009-\u2009b).You've got numbers a,\u2009b,\u2009w,\u2009x,\u2009c. Determine when Alexander gets ahead of Arthur if both guys start performing the operations at the same time. Assume that Alexander got ahead of Arthur if c\u2009\u2264\u2009a.", "input_spec": "The first line contains integers a,\u2009b,\u2009w,\u2009x,\u2009c (1\u2009\u2264\u2009a\u2009\u2264\u20092\u00b7109,\u20091\u2009\u2264\u2009w\u2009\u2264\u20091000,\u20090\u2009\u2264\u2009b\u2009<\u2009w,\u20090\u2009<\u2009x\u2009<\u2009w,\u20091\u2009\u2264\u2009c\u2009\u2264\u20092\u00b7109).", "output_spec": "Print a single integer \u2014 the minimum time in seconds Alexander needs to get ahead of Arthur. You can prove that the described situation always occurs within the problem's limits.", "sample_inputs": ["4 2 3 1 6", "4 2 3 1 7", "1 2 3 2 6", "1 1 2 1 1"], "sample_outputs": ["2", "4", "13", "0"], "notes": null}, "src_uid": "a1db3dd9f8d0f0cad7bdeb1780707143"}
{"nl": {"description": "Let's analyze a program written on some strange programming language. The variables in this language have names consisting of $$$1$$$ to $$$4$$$ characters, and each character is a lowercase or an uppercase Latin letter, or a digit. There is an extra constraint that the first character should not be a digit.There are four types of operations in the program, each denoted by one of the characters: $, ^, # or &.Each line of the program has one of the following formats:   <lvalue>=<rvalue>, where <lvalue> and <rvalue> are valid variable names;  <lvalue>=<arg1><op><arg2>, where <lvalue>, <arg1> and <arg2> are valid variable names, and <op> is an operation character. The program is executed line-by-line, and the result of execution is stored in a variable having the name res. If res is never assigned in the program, then the result will be equal to the value of res before running the program.Two programs are called equivalent if no matter which operations do characters $, ^, # and & denote (but, obviously, performing the same operation on the same arguments gives the same result) and which values do variables have before execution of program, the value of res after running the first program is equal to the value of res after running the second program (the programs are executed independently).You are given a program consisting of $$$n$$$ lines. Your task is to write a program consisting of minimum possible number of lines that is equivalent to the program you are given.", "input_spec": "The first line contains one integer $$$n$$$ ($$$1 \\le n \\le 1000$$$) \u2014 the number of lines in the program. Then $$$n$$$ lines follow \u2014 the program itself. Each line corresponds to the format described in the statement and has no extra whitespaces.", "output_spec": "In the first line print $$$k$$$ \u2014 the minimum number of lines in the equivalent program. Then print $$$k$$$ lines without any whitespaces \u2014 an equivalent program having exactly $$$k$$$ lines, in the same format it is described in the statement.", "sample_inputs": ["4\nc=aa#bb\nd12=c\nres=c^d12\ntmp=aa$c", "2\nmax=aaaa$bbbb\nmin=bbbb^aaaa"], "sample_outputs": ["2\naaaa=aa#bb\nres=aaaa^aaaa", "0"], "notes": null}, "src_uid": "da40321d92baaef42c2840e45599294c"}
{"nl": {"description": "The cows have just learned what a primitive root is! Given a prime p, a primitive root  is an integer x (1\u2009\u2264\u2009x\u2009<\u2009p) such that none of integers x\u2009-\u20091,\u2009x2\u2009-\u20091,\u2009...,\u2009xp\u2009-\u20092\u2009-\u20091 are divisible by p, but xp\u2009-\u20091\u2009-\u20091 is. Unfortunately, computing primitive roots can be time consuming, so the cows need your help. Given a prime p, help the cows find the number of primitive roots .", "input_spec": "The input contains a single line containing an integer p (2\u2009\u2264\u2009p\u2009<\u20092000). It is guaranteed that p is a prime.", "output_spec": "Output on a single line the number of primitive roots .", "sample_inputs": ["3", "5"], "sample_outputs": ["1", "2"], "notes": "NoteThe only primitive root  is 2.The primitive roots  are 2 and 3."}, "src_uid": "3bed682b6813f1ddb54410218c233cff"}
{"nl": {"description": "You are given a positive (greater than zero) integer $$$n$$$.You have to represent $$$n$$$ as the sum of integers (possibly negative) consisting only of ones (digits '1'). For example, $$$24 = 11 + 11 + 1 + 1$$$ and $$$102 = 111 - 11 + 1 + 1$$$. Among all possible representations, you have to find the one that uses the minimum number of ones in total.", "input_spec": "The single line contains one integer $$$n$$$ ($$$1 \\le n < 10^{50}$$$).", "output_spec": "Print one integer $$$x$$$ \u2014 the minimum number of ones, such that there exist a representation of $$$n$$$ as the sum of integers (possibly negative) that uses $$$x$$$ ones in total.", "sample_inputs": ["24", "102"], "sample_outputs": ["6", "7"], "notes": null}, "src_uid": "1961e7c9120ff652b15cad5dd5ca0907"}
{"nl": {"description": "You are given a regular polygon with $$$n$$$ vertices labeled from $$$1$$$ to $$$n$$$ in counter-clockwise order. The triangulation of a given polygon is a set of triangles such that each vertex of each triangle is a vertex of the initial polygon, there is no pair of triangles such that their intersection has non-zero area, and the total area of all triangles is equal to the area of the given polygon. The weight of a triangulation is the sum of weigths of triangles it consists of, where the weight of a triagle is denoted as the product of labels of its vertices.Calculate the minimum weight among all triangulations of the polygon.", "input_spec": "The first line contains single integer $$$n$$$ ($$$3 \\le n \\le 500$$$) \u2014 the number of vertices in the regular polygon.", "output_spec": "Print one integer \u2014 the minimum weight among all triangulations of the given polygon.", "sample_inputs": ["3", "4"], "sample_outputs": ["6", "18"], "notes": "NoteAccording to Wiki: polygon triangulation is the decomposition of a polygonal area (simple polygon) $$$P$$$ into a set of triangles, i.\u2009e., finding a set of triangles with pairwise non-intersecting interiors whose union is $$$P$$$.In the first example the polygon is a triangle, so we don't need to cut it further, so the answer is $$$1 \\cdot 2 \\cdot 3 = 6$$$.In the second example the polygon is a rectangle, so it should be divided into two triangles. It's optimal to cut it using diagonal $$$1-3$$$ so answer is $$$1 \\cdot 2 \\cdot 3 + 1 \\cdot 3 \\cdot 4 = 6 + 12 = 18$$$."}, "src_uid": "1bd29d7a8793c22e81a1f6fd3991307a"}
{"nl": {"description": "Last week, Hamed learned about a new type of equations in his math class called Modular Equations. Lets define i modulo j as the remainder of division of i by j and denote it by . A Modular Equation, as Hamed's teacher described, is an equation of the form  in which a and b are two non-negative integers and x is a variable. We call a positive integer x for which  a solution of our equation.Hamed didn't pay much attention to the class since he was watching a movie. He only managed to understand the definitions of these equations.Now he wants to write his math exercises but since he has no idea how to do that, he asked you for help. He has told you all he knows about Modular Equations and asked you to write a program which given two numbers a and b determines how many answers the Modular Equation  has.", "input_spec": "In the only line of the input two space-separated integers a and b (0\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009109) are given.", "output_spec": "If there is an infinite number of answers to our equation, print \"infinity\" (without the quotes). Otherwise print the number of solutions of the Modular Equation .", "sample_inputs": ["21 5", "9435152 272", "10 10"], "sample_outputs": ["2", "282", "infinity"], "notes": "NoteIn the first sample the answers of the Modular Equation are 8 and 16 since "}, "src_uid": "6e0715f9239787e085b294139abb2475"}
{"nl": {"description": "It's one more school day now. Sasha doesn't like classes and is always bored at them. So, each day he invents some game and plays in it alone or with friends.Today he invented one simple game to play with Lena, with whom he shares a desk. The rules are simple. Sasha draws n sticks in a row. After that the players take turns crossing out exactly k sticks from left or right in each turn. Sasha moves first, because he is the inventor of the game. If there are less than k sticks on the paper before some turn, the game ends. Sasha wins if he makes strictly more moves than Lena. Sasha wants to know the result of the game before playing, you are to help him.", "input_spec": "The first line contains two integers n and k (1\u2009\u2264\u2009n,\u2009k\u2009\u2264\u20091018, k\u2009\u2264\u2009n)\u00a0\u2014 the number of sticks drawn by Sasha and the number k\u00a0\u2014 the number of sticks to be crossed out on each turn.", "output_spec": "If Sasha wins, print \"YES\" (without quotes), otherwise print \"NO\" (without quotes). You can print each letter in arbitrary case (upper of lower).", "sample_inputs": ["1 1", "10 4"], "sample_outputs": ["YES", "NO"], "notes": "NoteIn the first example Sasha crosses out 1 stick, and then there are no sticks. So Lena can't make a move, and Sasha wins.In the second example Sasha crosses out 4 sticks, then Lena crosses out 4 sticks, and after that there are only 2 sticks left. Sasha can't make a move. The players make equal number of moves, so Sasha doesn't win."}, "src_uid": "05fd61dd0b1f50f154eec85d8cfaad50"}
{"nl": {"description": "Vasya the programmer lives in the middle of the Programming subway branch. He has two girlfriends: Dasha and Masha, who live at the different ends of the branch, each one is unaware of the other one's existence.When Vasya has some free time, he goes to one of his girlfriends. He descends into the subway at some time, waits the first train to come and rides on it to the end of the branch to the corresponding girl. However, the trains run with different frequencies: a train goes to Dasha's direction every a minutes, but a train goes to Masha's direction every b minutes. If two trains approach at the same time, Vasya goes toward the direction with the lower frequency of going trains, that is, to the girl, to whose directions the trains go less frequently (see the note to the third sample).We know that the trains begin to go simultaneously before Vasya appears. That is the train schedule is such that there exists a moment of time when the two trains arrive simultaneously.Help Vasya count to which girlfriend he will go more often.", "input_spec": "The first line contains two integers a and b (a\u2009\u2260\u2009b,\u20091\u2009\u2264\u2009a,\u2009b\u2009\u2264\u2009106).", "output_spec": "Print \"Dasha\" if Vasya will go to Dasha more frequently, \"Masha\" if he will go to Masha more frequently, or \"Equal\" if he will go to both girlfriends with the same frequency.", "sample_inputs": ["3 7", "5 3", "2 3"], "sample_outputs": ["Dasha", "Masha", "Equal"], "notes": "NoteLet's take a look at the third sample. Let the trains start to go at the zero moment of time. It is clear that the moments of the trains' arrival will be periodic with period 6. That's why it is enough to show that if Vasya descends to the subway at a moment of time inside the interval (0,\u20096], he will go to both girls equally often. If he descends to the subway at a moment of time from 0 to 2, he leaves for Dasha on the train that arrives by the second minute.If he descends to the subway at a moment of time from 2 to 3, he leaves for Masha on the train that arrives by the third minute.If he descends to the subway at a moment of time from 3 to 4, he leaves for Dasha on the train that arrives by the fourth minute.If he descends to the subway at a moment of time from 4 to 6, he waits for both trains to arrive by the sixth minute and goes to Masha as trains go less often in Masha's direction.In sum Masha and Dasha get equal time \u2014 three minutes for each one, thus, Vasya will go to both girlfriends equally often."}, "src_uid": "06eb66df61ff5d61d678bbb3bb6553cc"}
{"nl": {"description": "Today an outstanding event is going to happen in the forest\u00a0\u2014 hedgehog Filya will come to his old fried Sonya!Sonya is an owl and she sleeps during the day and stay awake from minute l1 to minute r1 inclusive. Also, during the minute k she prinks and is unavailable for Filya.Filya works a lot and he plans to visit Sonya from minute l2 to minute r2 inclusive.Calculate the number of minutes they will be able to spend together.", "input_spec": "The only line of the input contains integers l1, r1, l2, r2 and k (1\u2009\u2264\u2009l1,\u2009r1,\u2009l2,\u2009r2,\u2009k\u2009\u2264\u20091018, l1\u2009\u2264\u2009r1, l2\u2009\u2264\u2009r2), providing the segments of time for Sonya and Filya and the moment of time when Sonya prinks.", "output_spec": "Print one integer\u00a0\u2014 the number of minutes Sonya and Filya will be able to spend together.", "sample_inputs": ["1 10 9 20 1", "1 100 50 200 75"], "sample_outputs": ["2", "50"], "notes": "NoteIn the first sample, they will be together during minutes 9 and 10.In the second sample, they will be together from minute 50 to minute 74 and from minute 76 to minute 100."}, "src_uid": "9a74b3b0e9f3a351f2136842e9565a82"}
{"nl": {"description": "It can be shown that any positive integer x can be uniquely represented as x\u2009=\u20091\u2009+\u20092\u2009+\u20094\u2009+\u2009...\u2009+\u20092k\u2009-\u20091\u2009+\u2009r, where k and r are integers, k\u2009\u2265\u20090, 0\u2009<\u2009r\u2009\u2264\u20092k. Let's call that representation prairie partition of x.For example, the prairie partitions of 12, 17, 7 and 1 are:  12\u2009=\u20091\u2009+\u20092\u2009+\u20094\u2009+\u20095,17\u2009=\u20091\u2009+\u20092\u2009+\u20094\u2009+\u20098\u2009+\u20092,7\u2009=\u20091\u2009+\u20092\u2009+\u20094,1\u2009=\u20091. Alice took a sequence of positive integers (possibly with repeating elements), replaced every element with the sequence of summands in its prairie partition, arranged the resulting numbers in non-decreasing order and gave them to Borys. Now Borys wonders how many elements Alice's original sequence could contain. Find all possible options!", "input_spec": "The first line contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u2009105)\u00a0\u2014 the number of numbers given from Alice to Borys. The second line contains n integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u20091012; a1\u2009\u2264\u2009a2\u2009\u2264\u2009...\u2009\u2264\u2009an)\u00a0\u2014 the numbers given from Alice to Borys.", "output_spec": "Output, in increasing order, all possible values of m such that there exists a sequence of positive integers of length m such that if you replace every element with the summands in its prairie partition and arrange the resulting numbers in non-decreasing order, you will get the sequence given in the input. If there are no such values of m, output a single integer -1.", "sample_inputs": ["8\n1 1 2 2 3 4 5 8", "6\n1 1 1 2 2 2", "5\n1 2 4 4 4"], "sample_outputs": ["2", "2 3", "-1"], "notes": "NoteIn the first example, Alice could get the input sequence from [6,\u200920] as the original sequence.In the second example, Alice's original sequence could be either [4,\u20095] or [3,\u20093,\u20093]."}, "src_uid": "fc29e8c1a9117c1dd307131d852b6088"}
{"nl": {"description": "You are given an array a consisting of n integers, and additionally an integer m. You have to choose some sequence of indices b1,\u2009b2,\u2009...,\u2009bk (1\u2009\u2264\u2009b1\u2009<\u2009b2\u2009<\u2009...\u2009<\u2009bk\u2009\u2264\u2009n) in such a way that the value of  is maximized. Chosen sequence can be empty.Print the maximum possible value of .", "input_spec": "The first line contains two integers n and m (1\u2009\u2264\u2009n\u2009\u2264\u200935, 1\u2009\u2264\u2009m\u2009\u2264\u2009109). The second line contains n integers a1, a2, ..., an (1\u2009\u2264\u2009ai\u2009\u2264\u2009109).", "output_spec": "Print the maximum possible value of .", "sample_inputs": ["4 4\n5 2 4 1", "3 20\n199 41 299"], "sample_outputs": ["3", "19"], "notes": "NoteIn the first example you can choose a sequence b\u2009=\u2009{1,\u20092}, so the sum  is equal to 7 (and that's 3 after taking it modulo 4).In the second example you can choose a sequence b\u2009=\u2009{3}."}, "src_uid": "d3a8a3e69a55936ee33aedd66e5b7f4a"}
{"nl": {"description": "Not so long ago the Codecraft-17 contest was held on Codeforces. The top 25 participants, and additionally random 25 participants out of those who got into top 500, will receive a Codeforces T-shirt.Unfortunately, you didn't manage to get into top 25, but you got into top 500, taking place p.Now the elimination round of 8VC Venture Cup 2017 is being held. It has been announced that the Codecraft-17 T-shirt winners will be chosen as follows. Let s be the number of points of the winner of the elimination round of 8VC Venture Cup 2017. Then the following pseudocode will be executed: i := (s div 50) mod 475repeat 25 times:    i := (i * 96 + 42) mod 475    print (26 + i)Here \"div\" is the integer division operator, \"mod\" is the modulo (the remainder of division) operator.As the result of pseudocode execution, 25 integers between 26 and 500, inclusive, will be printed. These will be the numbers of places of the participants who get the Codecraft-17 T-shirts. It is guaranteed that the 25 printed integers will be pairwise distinct for any value of s.You're in the lead of the elimination round of 8VC Venture Cup 2017, having x points. You believe that having at least y points in the current round will be enough for victory.To change your final score, you can make any number of successful and unsuccessful hacks. A successful hack brings you 100 points, an unsuccessful one takes 50 points from you. It's difficult to do successful hacks, though.You want to win the current round and, at the same time, ensure getting a Codecraft-17 T-shirt. What is the smallest number of successful hacks you have to do to achieve that?", "input_spec": "The only line contains three integers p, x and y (26\u2009\u2264\u2009p\u2009\u2264\u2009500; 1\u2009\u2264\u2009y\u2009\u2264\u2009x\u2009\u2264\u200920000)\u00a0\u2014 your place in Codecraft-17, your current score in the elimination round of 8VC Venture Cup 2017, and the smallest number of points you consider sufficient for winning the current round.", "output_spec": "Output a single integer\u00a0\u2014 the smallest number of successful hacks you have to do in order to both win the elimination round of 8VC Venture Cup 2017 and ensure getting a Codecraft-17 T-shirt. It's guaranteed that your goal is achievable for any valid input data.", "sample_inputs": ["239 10880 9889", "26 7258 6123", "493 8000 8000", "101 6800 6500", "329 19913 19900"], "sample_outputs": ["0", "2", "24", "0", "8"], "notes": "NoteIn the first example, there is no need to do any hacks since 10880 points already bring the T-shirt to the 239-th place of Codecraft-17 (that is, you). In this case, according to the pseudocode, the T-shirts will be given to the participants at the following places: 475 422 84 411 453 210 157 294 146 188 420 367 29 356 398 155 102 239 91 133 365 312 449 301 343In the second example, you have to do two successful and one unsuccessful hack to make your score equal to 7408.In the third example, you need to do as many as 24 successful hacks to make your score equal to 10400.In the fourth example, it's sufficient to do 6 unsuccessful hacks (and no successful ones) to make your score equal to 6500, which is just enough for winning the current round and also getting the T-shirt."}, "src_uid": "c9c22e03c70a94a745b451fc79e112fd"}
{"nl": {"description": "Kuro has recently won the \"Most intelligent cat ever\" contest. The three friends then decided to go to Katie's home to celebrate Kuro's winning. After a big meal, they took a small break then started playing games.Kuro challenged Katie to create a game with only a white paper, a pencil, a pair of scissors and a lot of arrows (you can assume that the number of arrows is infinite). Immediately, Katie came up with the game called Topological Parity.The paper is divided into $$$n$$$ pieces enumerated from $$$1$$$ to $$$n$$$. Shiro has painted some pieces with some color. Specifically, the $$$i$$$-th piece has color $$$c_{i}$$$ where $$$c_{i} = 0$$$ defines black color, $$$c_{i} = 1$$$ defines white color and $$$c_{i} = -1$$$ means that the piece hasn't been colored yet.The rules of the game is simple. Players must put some arrows between some pairs of different pieces in such a way that for each arrow, the number in the piece it starts from is less than the number of the piece it ends at. Also, two different pieces can only be connected by at most one arrow. After that the players must choose the color ($$$0$$$ or $$$1$$$) for each of the unpainted pieces. The score of a valid way of putting the arrows and coloring pieces is defined as the number of paths of pieces of alternating colors. For example, $$$[1 \\to 0 \\to 1 \\to 0]$$$, $$$[0 \\to 1 \\to 0 \\to 1]$$$, $$$[1]$$$, $$$[0]$$$ are valid paths and will be counted. You can only travel from piece $$$x$$$ to piece $$$y$$$ if and only if there is an arrow from $$$x$$$ to $$$y$$$.But Kuro is not fun yet. He loves parity. Let's call his favorite parity $$$p$$$ where $$$p = 0$$$ stands for \"even\" and $$$p = 1$$$ stands for \"odd\". He wants to put the arrows and choose colors in such a way that the score has the parity of $$$p$$$.It seems like there will be so many ways which satisfy Kuro. He wants to count the number of them but this could be a very large number. Let's help him with his problem, but print it modulo $$$10^{9} + 7$$$.", "input_spec": "The first line contains two integers $$$n$$$ and $$$p$$$ ($$$1 \\leq n \\leq 50$$$, $$$0 \\leq p \\leq 1$$$) \u2014 the number of pieces and Kuro's wanted parity. The second line contains $$$n$$$ integers $$$c_{1}, c_{2}, ..., c_{n}$$$ ($$$-1 \\leq c_{i} \\leq 1$$$) \u2014 the colors of the pieces.", "output_spec": "Print a single integer \u2014 the number of ways to put the arrows and choose colors so the number of valid paths of alternating colors has the parity of $$$p$$$.", "sample_inputs": ["3 1\n-1 0 1", "2 1\n1 0", "1 1\n-1"], "sample_outputs": ["6", "1", "2"], "notes": "NoteIn the first example, there are $$$6$$$ ways to color the pieces and add the arrows, as are shown in the figure below. The scores are $$$3, 3, 5$$$ for the first row and $$$5, 3, 3$$$ for the second row, both from left to right.  "}, "src_uid": "aaf5f8afa71d9d25ebab405dddec78cd"}
{"nl": {"description": "Since Grisha behaved well last year, at New Year's Eve he was visited by Ded Moroz who brought an enormous bag of gifts with him! The bag contains n sweet candies from the good ol' bakery, each labeled from 1 to n corresponding to its tastiness. No two candies have the same tastiness.The choice of candies has a direct effect on Grisha's happiness. One can assume that he should take the tastiest ones\u00a0\u2014 but no, the holiday magic turns things upside down. It is the xor-sum of tastinesses that matters, not the ordinary sum!A xor-sum of a sequence of integers a1,\u2009a2,\u2009...,\u2009am is defined as the bitwise XOR of all its elements: , here  denotes the bitwise XOR operation; more about bitwise XOR can be found here.Ded Moroz warned Grisha he has more houses to visit, so Grisha can take no more than k candies from the bag. Help Grisha determine the largest xor-sum (largest xor-sum means maximum happiness!) he can obtain.", "input_spec": "The sole string contains two integers n and k (1\u2009\u2264\u2009k\u2009\u2264\u2009n\u2009\u2264\u20091018).", "output_spec": "Output one number\u00a0\u2014 the largest possible xor-sum.", "sample_inputs": ["4 3", "6 6"], "sample_outputs": ["7", "7"], "notes": "NoteIn the first sample case, one optimal answer is 1, 2 and 4, giving the xor-sum of 7.In the second sample case, one can, for example, take all six candies and obtain the xor-sum of 7."}, "src_uid": "16bc089f5ef6b68bebe8eda6ead2eab9"}
{"nl": {"description": "I have an undirected graph consisting of n nodes, numbered 1 through n. Each node has at most two incident edges. For each pair of nodes, there is at most an edge connecting them. No edge connects a node to itself.I would like to create a new graph in such a way that:   The new graph consists of the same number of nodes and edges as the old graph.  The properties in the first paragraph still hold.  For each two nodes u and v, if there is an edge connecting them in the old graph, there is no edge connecting them in the new graph. Help me construct the new graph, or tell me if it is impossible.", "input_spec": "The first line consists of two space-separated integers: n and m (1\u2009\u2264\u2009m\u2009\u2264\u2009n\u2009\u2264\u2009105), denoting the number of nodes and edges, respectively. Then m lines follow. Each of the m lines consists of two space-separated integers u and v (1\u2009\u2264\u2009u,\u2009v\u2009\u2264\u2009n;\u00a0u\u2009\u2260\u2009v), denoting an edge between nodes u and v.", "output_spec": "If it is not possible to construct a new graph with the mentioned properties, output a single line consisting of -1. Otherwise, output exactly m lines. Each line should contain a description of edge in the same way as used in the input format.", "sample_inputs": ["8 7\n1 2\n2 3\n4 5\n5 6\n6 8\n8 7\n7 4", "3 2\n1 2\n2 3", "5 4\n1 2\n2 3\n3 4\n4 1"], "sample_outputs": ["1 4\n4 6\n1 6\n2 7\n7 5\n8 5\n2 8", "-1", "1 3\n3 5\n5 2\n2 4"], "notes": "NoteThe old graph of the first example:A possible new graph for the first example:In the second example, we cannot create any new graph.The old graph of the third example:A possible new graph for the third example:"}, "src_uid": "c4c85cde8a5bb5fefa4eb68fc68657d5"}
{"nl": {"description": "At a geometry lesson Gerald was given a task: to get vector B out of vector A. Besides, the teacher permitted him to perform the following operations with vector \u0410: Turn the vector by 90 degrees clockwise. Add to the vector a certain vector C.Operations could be performed in any order any number of times.Can Gerald cope with the task?", "input_spec": "The first line contains integers x1 \u0438 y1 \u2014 the coordinates of the vector A (\u2009-\u2009108\u2009\u2264\u2009x1,\u2009y1\u2009\u2264\u2009108). The second and the third line contain in the similar manner vectors B and C (their coordinates are integers; their absolute value does not exceed 108).", "output_spec": "Print \"YES\" (without the quotes) if it is possible to get vector B using the given operations. Otherwise print \"NO\" (without the quotes).", "sample_inputs": ["0 0\n1 1\n0 1", "0 0\n1 1\n1 1", "0 0\n1 1\n2 2"], "sample_outputs": ["YES", "YES", "NO"], "notes": null}, "src_uid": "cc8a8af1ba2b19bf081e379139542883"}
{"nl": {"description": "Two friends are on the coordinate axis Ox in points with integer coordinates. One of them is in the point x1\u2009=\u2009a, another one is in the point x2\u2009=\u2009b. Each of the friends can move by one along the line in any direction unlimited number of times. When a friend moves, the tiredness of a friend changes according to the following rules: the first move increases the tiredness by 1, the second move increases the tiredness by 2, the third\u00a0\u2014 by 3 and so on. For example, if a friend moves first to the left, then to the right (returning to the same point), and then again to the left his tiredness becomes equal to 1\u2009+\u20092\u2009+\u20093\u2009=\u20096.The friends want to meet in a integer point. Determine the minimum total tiredness they should gain, if they meet in the same point.", "input_spec": "The first line contains a single integer a (1\u2009\u2264\u2009a\u2009\u2264\u20091000) \u2014 the initial position of the first friend.  The second line contains a single integer b (1\u2009\u2264\u2009b\u2009\u2264\u20091000) \u2014 the initial position of the second friend. It is guaranteed that a\u2009\u2260\u2009b.", "output_spec": "Print the minimum possible total tiredness if the friends meet in the same point.", "sample_inputs": ["3\n4", "101\n99", "5\n10"], "sample_outputs": ["1", "2", "9"], "notes": "NoteIn the first example the first friend should move by one to the right (then the meeting happens at point 4), or the second friend should move by one to the left (then the meeting happens at point 3). In both cases, the total tiredness becomes 1.In the second example the first friend should move by one to the left, and the second friend should move by one to the right. Then they meet in the point 100, and the total tiredness becomes 1\u2009+\u20091\u2009=\u20092.In the third example one of the optimal ways is the following. The first friend should move three times to the right, and the second friend \u2014 two times to the left. Thus the friends meet in the point 8, and the total tiredness becomes 1\u2009+\u20092\u2009+\u20093\u2009+\u20091\u2009+\u20092\u2009=\u20099."}, "src_uid": "d3f2c6886ed104d7baba8dd7b70058da"}
{"nl": {"description": "As behooves any intelligent schoolboy, Kevin Sun is studying psycowlogy, cowculus, and cryptcowgraphy at the Bovinia State University (BGU) under Farmer Ivan. During his Mathematics of Olympiads (MoO) class, Kevin was confronted with a weird functional equation and needs your help. For two fixed integers k and p, where p is an odd prime number, the functional equation states that  for some function . (This equation should hold for any integer x in the range 0 to p\u2009-\u20091, inclusive.)It turns out that f can actually be many different functions. Instead of finding a solution, Kevin wants you to count the number of distinct functions f that satisfy this equation. Since the answer may be very large, you should print your result modulo 109\u2009+\u20097.", "input_spec": "The input consists of two space-separated integers p and k (3\u2009\u2264\u2009p\u2009\u2264\u20091\u2009000\u2009000, 0\u2009\u2264\u2009k\u2009\u2264\u2009p\u2009-\u20091) on a single line. It is guaranteed that p is an odd prime number.", "output_spec": "Print a single integer, the number of distinct functions f modulo 109\u2009+\u20097.", "sample_inputs": ["3 2", "5 4"], "sample_outputs": ["3", "25"], "notes": "NoteIn the first sample, p\u2009=\u20093 and k\u2009=\u20092. The following functions work:   f(0)\u2009=\u20090, f(1)\u2009=\u20091, f(2)\u2009=\u20092.  f(0)\u2009=\u20090, f(1)\u2009=\u20092, f(2)\u2009=\u20091.  f(0)\u2009=\u2009f(1)\u2009=\u2009f(2)\u2009=\u20090. "}, "src_uid": "580bf65af24fb7f08250ddbc4ca67e0e"}
{"nl": {"description": "Once again Tavas started eating coffee mix without water! Keione told him that it smells awful, but he didn't stop doing that. That's why Keione told his smart friend, SaDDas to punish him! SaDDas took Tavas' headphones and told him: \"If you solve the following problem, I'll return it to you.\"  The problem is: You are given a lucky number n. Lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.If we sort all lucky numbers in increasing order, what's the 1-based index of n? Tavas is not as smart as SaDDas, so he asked you to do him a favor and solve this problem so he can have his headphones back.", "input_spec": "The first and only line of input contains a lucky number n (1\u2009\u2264\u2009n\u2009\u2264\u2009109).", "output_spec": "Print the index of n among all lucky numbers.", "sample_inputs": ["4", "7", "77"], "sample_outputs": ["1", "2", "6"], "notes": null}, "src_uid": "6a10bfe8b3da9c11167e136b3c6fb2a3"}
{"nl": {"description": "\u2014 This is not playing but duty as allies of justice, Nii-chan!\u2014 Not allies but justice itself, Onii-chan!With hands joined, go everywhere at a speed faster than our thoughts! This time, the Fire Sisters\u00a0\u2014 Karen and Tsukihi\u00a0\u2014 is heading for somewhere they've never reached\u00a0\u2014 water-surrounded islands!There are three clusters of islands, conveniently coloured red, blue and purple. The clusters consist of a, b and c distinct islands respectively.Bridges have been built between some (possibly all or none) of the islands. A bridge bidirectionally connects two different islands and has length 1. For any two islands of the same colour, either they shouldn't be reached from each other through bridges, or the shortest distance between them is at least 3, apparently in order to prevent oddities from spreading quickly inside a cluster.The Fire Sisters are ready for the unknown, but they'd also like to test your courage. And you're here to figure out the number of different ways to build all bridges under the constraints, and give the answer modulo 998\u2009244\u2009353. Two ways are considered different if a pair of islands exist, such that there's a bridge between them in one of them, but not in the other.", "input_spec": "The first and only line of input contains three space-separated integers a, b and c (1\u2009\u2264\u2009a,\u2009b,\u2009c\u2009\u2264\u20095\u2009000)\u00a0\u2014 the number of islands in the red, blue and purple clusters, respectively.", "output_spec": "Output one line containing an integer\u00a0\u2014 the number of different ways to build bridges, modulo 998\u2009244\u2009353.", "sample_inputs": ["1 1 1", "1 2 2", "1 3 5", "6 2 9"], "sample_outputs": ["8", "63", "3264", "813023575"], "notes": "NoteIn the first example, there are 3 bridges that can possibly be built, and no setup of bridges violates the restrictions. Thus the answer is 23\u2009=\u20098.In the second example, the upper two structures in the figure below are instances of valid ones, while the lower two are invalid due to the blue and purple clusters, respectively.  "}, "src_uid": "b6dc5533fbf285d5ef4cf60ef6300383"}
{"nl": {"description": "The only difference between easy and hard versions is constraints.Ivan plays a computer game that contains some microtransactions to make characters look cooler. Since Ivan wants his character to be really cool, he wants to use some of these microtransactions \u2014 and he won't start playing until he gets all of them.Each day (during the morning) Ivan earns exactly one burle.There are $$$n$$$ types of microtransactions in the game. Each microtransaction costs $$$2$$$ burles usually and $$$1$$$ burle if it is on sale. Ivan has to order exactly $$$k_i$$$ microtransactions of the $$$i$$$-th type (he orders microtransactions during the evening).Ivan can order any (possibly zero) number of microtransactions of any types during any day (of course, if he has enough money to do it). If the microtransaction he wants to order is on sale then he can buy it for $$$1$$$ burle and otherwise he can buy it for $$$2$$$ burles.There are also $$$m$$$ special offers in the game shop. The $$$j$$$-th offer $$$(d_j, t_j)$$$ means that microtransactions of the $$$t_j$$$-th type are on sale during the $$$d_j$$$-th day.Ivan wants to order all microtransactions as soon as possible. Your task is to calculate the minimum day when he can buy all microtransactions he want and actually start playing.", "input_spec": "The first line of the input contains two integers $$$n$$$ and $$$m$$$ ($$$1 \\le n, m \\le 1000$$$) \u2014 the number of types of microtransactions and the number of special offers in the game shop. The second line of the input contains $$$n$$$ integers $$$k_1, k_2, \\dots, k_n$$$ ($$$0 \\le k_i \\le 1000$$$), where $$$k_i$$$ is the number of copies of microtransaction of the $$$i$$$-th type Ivan has to order. It is guaranteed that sum of all $$$k_i$$$ is not less than $$$1$$$ and not greater than $$$1000$$$. The next $$$m$$$ lines contain special offers. The $$$j$$$-th of these lines contains the $$$j$$$-th special offer. It is given as a pair of integers $$$(d_j, t_j)$$$ ($$$1 \\le d_j \\le 1000, 1 \\le t_j \\le n$$$) and means that microtransactions of the $$$t_j$$$-th type are on sale during the $$$d_j$$$-th day.", "output_spec": "Print one integer \u2014 the minimum day when Ivan can order all microtransactions he wants and actually start playing.", "sample_inputs": ["5 6\n1 2 0 2 0\n2 4\n3 3\n1 5\n1 2\n1 5\n2 3", "5 3\n4 2 1 3 2\n3 5\n4 2\n2 5"], "sample_outputs": ["8", "20"], "notes": null}, "src_uid": "2eb101dcfcc487fe6e44c9b4c0e4024d"}
{"nl": {"description": "Every year, hundreds of people come to summer camps, they learn new algorithms and solve hard problems.This is your first year at summer camp, and you are asked to solve the following problem. All integers starting with 1 are written in one line. The prefix of these line is \"123456789101112131415...\". Your task is to print the n-th digit of this string (digits are numbered starting with 1.", "input_spec": "The only line of the input contains a single integer n (1\u2009\u2264\u2009n\u2009\u2264\u20091000)\u00a0\u2014 the position of the digit you need to print.", "output_spec": "Print the n-th digit of the line.", "sample_inputs": ["3", "11"], "sample_outputs": ["3", "0"], "notes": "NoteIn the first sample the digit at position 3 is '3', as both integers 1 and 2 consist on one digit.In the second sample, the digit at position 11 is '0', it belongs to the integer 10."}, "src_uid": "2d46e34839261eda822f0c23c6e19121"}
{"nl": {"description": "Valera the Horse is going to the party with friends. He has been following the fashion trends for a while, and he knows that it is very popular to wear all horseshoes of different color. Valera has got four horseshoes left from the last year, but maybe some of them have the same color. In this case he needs to go to the store and buy some few more horseshoes, not to lose face in front of his stylish comrades.Fortunately, the store sells horseshoes of all colors under the sun and Valera has enough money to buy any four of them. However, in order to save the money, he would like to spend as little money as possible, so you need to help Valera and determine what is the minimum number of horseshoes he needs to buy to wear four horseshoes of different colors to a party.", "input_spec": "The first line contains four space-separated integers s1,\u2009s2,\u2009s3,\u2009s4 (1\u2009\u2264\u2009s1,\u2009s2,\u2009s3,\u2009s4\u2009\u2264\u2009109) \u2014 the colors of horseshoes Valera has. Consider all possible colors indexed with integers.", "output_spec": "Print a single integer \u2014 the minimum number of horseshoes Valera needs to buy.", "sample_inputs": ["1 7 3 3", "7 7 7 7"], "sample_outputs": ["1", "3"], "notes": null}, "src_uid": "38c4864937e57b35d3cce272f655e20f"}
{"nl": {"description": "Polycarpus has postcards and photos hung in a row on the wall. He decided to put them away to the closet and hang on the wall a famous painter's picture. Polycarpus does it like that: he goes from the left to the right and removes the objects consecutively. As Polycarpus doesn't want any mix-ups to happen, he will not carry in his hands objects of two different types. In other words, Polycarpus can't carry both postcards and photos simultaneously. Sometimes he goes to the closet and puts the objects there, thus leaving his hands free. Polycarpus must put all the postcards and photos to the closet. He cannot skip objects. What minimum number of times he should visit the closet if he cannot carry more than 5 items?", "input_spec": "The only line of the input data contains a non-empty string consisting of letters \"\u0421\" and \"P\" whose length does not exceed 100 characters. If the i-th character in the string is the letter \"\u0421\", that means that the i-th object (the numbering goes from the left to the right) on Polycarpus' wall is a postcard. And if the i-th character is the letter \"P\", than the i-th object on the wall is a photo.", "output_spec": "Print the only number \u2014 the minimum number of times Polycarpus has to visit the closet.", "sample_inputs": ["CPCPCPC", "CCCCCCPPPPPP", "CCCCCCPPCPPPPPPPPPP", "CCCCCCCCCC"], "sample_outputs": ["7", "4", "6", "2"], "notes": "NoteIn the first sample Polycarpus needs to take one item to the closet 7 times.In the second sample Polycarpus can first take 3 postcards to the closet; then 3 more. He can take the 6 photos that are left in the similar way, going to the closet twice.In the third sample Polycarpus can visit the closet twice, both times carrying 3 postcards. Then he can take there 2 photos at once, then one postcard and finally, he can carry the last 10 photos if he visits the closet twice.In the fourth sample Polycarpus can visit the closet twice and take there all 10 postcards (5 items during each go)."}, "src_uid": "5257f6b50f5a610a17c35a47b3a0da11"}
{"nl": {"description": "Vasya works as a DJ in the best Berland nightclub, and he often uses dubstep music in his performance. Recently, he has decided to take a couple of old songs and make dubstep remixes from them.Let's assume that a song consists of some number of words. To make the dubstep remix of this song, Vasya inserts a certain number of words \"WUB\" before the first word of the song (the number may be zero), after the last word (the number may be zero), and between words (at least one between any pair of neighbouring words), and then the boy glues together all the words, including \"WUB\", in one string and plays the song at the club.For example, a song with words \"I AM X\" can transform into a dubstep remix as \"WUBWUBIWUBAMWUBWUBX\" and cannot transform into \"WUBWUBIAMWUBX\".Recently, Petya has heard Vasya's new dubstep track, but since he isn't into modern music, he decided to find out what was the initial song that Vasya remixed. Help Petya restore the original song.", "input_spec": "The input consists of a single non-empty string, consisting only of uppercase English letters, the string's length doesn't exceed 200 characters. It is guaranteed that before Vasya remixed the song, no word contained substring \"WUB\" in it; Vasya didn't change the word order. It is also guaranteed that initially the song had at least one word.", "output_spec": "Print the words of the initial song that Vasya used to make a dubsteb remix. Separate the words with a space.", "sample_inputs": ["WUBWUBABCWUB", "WUBWEWUBAREWUBWUBTHEWUBCHAMPIONSWUBMYWUBFRIENDWUB"], "sample_outputs": ["ABC", "WE ARE THE CHAMPIONS MY FRIEND"], "notes": "NoteIn the first sample: \"WUBWUBABCWUB\" = \"WUB\" + \"WUB\" + \"ABC\" + \"WUB\". That means that the song originally consisted of a single word \"ABC\", and all words \"WUB\" were added by Vasya.In the second sample Vasya added a single word \"WUB\" between all neighbouring words, in the beginning and in the end, except for words \"ARE\" and \"THE\" \u2014 between them Vasya added two \"WUB\"."}, "src_uid": "edede580da1395fe459a480f6a0a548d"}
{"nl": {"description": "Limak is a grizzly bear who desires power and adoration. He wants to win in upcoming elections and rule over the Bearland.There are n candidates, including Limak. We know how many citizens are going to vote for each candidate. Now i-th candidate would get ai votes. Limak is candidate number 1. To win in elections, he must get strictly more votes than any other candidate.Victory is more important than everything else so Limak decided to cheat. He will steal votes from his opponents by bribing some citizens. To bribe a citizen, Limak must give him or her one candy - citizens are bears and bears like candies. Limak doesn't have many candies and wonders - how many citizens does he have to bribe?", "input_spec": "The first line contains single integer n (2\u2009\u2264\u2009n\u2009\u2264\u2009100) - number of candidates. The second line contains n space-separated integers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u20091000) - number of votes for each candidate. Limak is candidate number 1. Note that after bribing number of votes for some candidate might be zero or might be greater than 1000.", "output_spec": "Print the minimum number of citizens Limak must bribe to have strictly more votes than any other candidate.", "sample_inputs": ["5\n5 1 11 2 8", "4\n1 8 8 8", "2\n7 6"], "sample_outputs": ["4", "6", "0"], "notes": "NoteIn the first sample Limak has 5 votes. One of the ways to achieve victory is to bribe 4 citizens who want to vote for the third candidate. Then numbers of votes would be 9,\u20091,\u20097,\u20092,\u20098 (Limak would have 9 votes). Alternatively, Limak could steal only 3 votes from the third candidate and 1 vote from the second candidate to get situation 9,\u20090,\u20098,\u20092,\u20098.In the second sample Limak will steal 2 votes from each candidate. Situation will be 7,\u20096,\u20096,\u20096.In the third sample Limak is a winner without bribing any citizen."}, "src_uid": "aa8fabf7c817dfd3d585b96a07bb7f58"}
{"nl": {"description": "Ted has a pineapple. This pineapple is able to bark like a bulldog! At time t (in seconds) it barks for the first time. Then every s seconds after it, it barks twice with 1 second interval. Thus it barks at times t, t\u2009+\u2009s, t\u2009+\u2009s\u2009+\u20091, t\u2009+\u20092s, t\u2009+\u20092s\u2009+\u20091, etc.  Barney woke up in the morning and wants to eat the pineapple, but he can't eat it when it's barking. Barney plans to eat it at time x (in seconds), so he asked you to tell him if it's gonna bark at that time.", "input_spec": "The first and only line of input contains three integers t, s and x (0\u2009\u2264\u2009t,\u2009x\u2009\u2264\u2009109, 2\u2009\u2264\u2009s\u2009\u2264\u2009109)\u00a0\u2014 the time the pineapple barks for the first time, the pineapple barking interval, and the time Barney wants to eat the pineapple respectively.", "output_spec": "Print a single \"YES\" (without quotes) if the pineapple will bark at time x or a single \"NO\" (without quotes) otherwise in the only line of output.", "sample_inputs": ["3 10 4", "3 10 3", "3 8 51", "3 8 52"], "sample_outputs": ["NO", "YES", "YES", "YES"], "notes": "NoteIn the first and the second sample cases pineapple will bark at moments 3, 13, 14, ..., so it won't bark at the moment 4 and will bark at the moment 3.In the third and fourth sample cases pineapple will bark at moments 3, 11, 12, 19, 20, 27, 28, 35, 36, 43, 44, 51, 52, 59, ..., so it will bark at both moments 51 and 52."}, "src_uid": "3baf9d841ff7208c66f6de1b47b0f952"}
{"nl": {"description": "Polycarp has just invented a new binary protocol for data transmission. He is encoding positive integer decimal number to binary string using following algorithm:  Each digit is represented with number of '1' characters equal to the value of that digit (for 0 it is zero ones).  Digits are written one by one in order corresponding to number and separated by single '0' character. Though Polycarp learnt how to encode the numbers, he has no idea how to decode them back. Help him calculate the decoded number.", "input_spec": "The first line contains one integer number n (1\u2009\u2264\u2009n\u2009\u2264\u200989) \u2014 length of the string s. The second line contains string s \u2014 sequence of '0' and '1' characters, number in its encoded format. It is guaranteed that the number corresponding to the string is positive and doesn't exceed 109. The string always starts with '1'.", "output_spec": "Print the decoded number.", "sample_inputs": ["3\n111", "9\n110011101"], "sample_outputs": ["3", "2031"], "notes": null}, "src_uid": "a4b3da4cb9b6a7ed0a33a862e940cafa"}
{"nl": {"description": "You have a set of items, each having some integer weight not greater than $$$8$$$. You denote that a subset of items is good if total weight of items in the subset does not exceed $$$W$$$.You want to calculate the maximum possible weight of a good subset of items. Note that you have to consider the empty set and the original set when calculating the answer.", "input_spec": "The first line contains one integer $$$W$$$ ($$$0 \\le W \\le 10^{18}$$$) \u2014 the maximum total weight of a good subset. The second line denotes the set of items you have. It contains $$$8$$$ integers $$$cnt_1$$$, $$$cnt_2$$$, ..., $$$cnt_8$$$ ($$$0 \\le cnt_i \\le 10^{16}$$$), where $$$cnt_i$$$ is the number of items having weight $$$i$$$ in the set.", "output_spec": "Print one integer \u2014 the maximum possible weight of a good subset of items.", "sample_inputs": ["10\n1 2 3 4 5 6 7 8", "0\n0 0 0 0 0 0 0 0", "3\n0 4 1 0 0 9 8 3"], "sample_outputs": ["10", "0", "3"], "notes": null}, "src_uid": "8097e10157320524c0faed56f2bc4880"}
{"nl": {"description": "There are three doors in front of you, numbered from $$$1$$$ to $$$3$$$ from left to right. Each door has a lock on it, which can only be opened with a key with the same number on it as the number on the door.There are three keys\u00a0\u2014 one for each door. Two of them are hidden behind the doors, so that there is no more than one key behind each door. So two doors have one key behind them, one door doesn't have a key behind it. To obtain a key hidden behind a door, you should first unlock that door. The remaining key is in your hands.Can you open all the doors?", "input_spec": "The first line contains a single integer $$$t$$$ ($$$1 \\le t \\le 18$$$)\u00a0\u2014 the number of testcases. The first line of each testcase contains a single integer $$$x$$$ ($$$1 \\le x \\le 3$$$)\u00a0\u2014 the number on the key in your hands. The second line contains three integers $$$a, b$$$ and $$$c$$$ ($$$0 \\le a, b, c \\le 3$$$)\u00a0\u2014 the number on the key behind each of the doors. If there is no key behind the door, the number is equal to $$$0$$$. Values $$$1, 2$$$ and $$$3$$$ appear exactly once among $$$x, a, b$$$ and $$$c$$$.", "output_spec": "For each testcase, print \"YES\" if you can open all the doors. Otherwise, print \"NO\".", "sample_inputs": ["4\n\n3\n\n0 1 2\n\n1\n\n0 3 2\n\n2\n\n3 1 0\n\n2\n\n1 3 0"], "sample_outputs": ["YES\nNO\nYES\nNO"], "notes": null}, "src_uid": "5cd113a30bbbb93d8620a483d4da0349"}
{"nl": {"description": "Vasya studies music. He has learned lots of interesting stuff. For example, he knows that there are 12 notes: C, C#, D, D#, E, F, F#, G, G#, A, B, H. He also knows that the notes are repeated cyclically: after H goes C again, and before C stands H. We will consider the C note in the row's beginning and the C note after the H similar and we will identify them with each other. The distance between the notes along the musical scale is measured in tones: between two consecutive notes there's exactly one semitone, that is, 0.5 tone. The distance is taken from the lowest tone to the uppest one, that is, the distance between C and E is 4 semitones and between E and C is 8 semitonesVasya also knows what a chord is. A chord is an unordered set of no less than three notes. However, for now Vasya only works with triads, that is with the chords that consist of exactly three notes. He can already distinguish between two types of triads \u2014 major and minor.Let's define a major triad. Let the triad consist of notes X, Y and Z. If we can order the notes so as the distance along the musical scale between X and Y equals 4 semitones and the distance between Y and Z is 3 semitones, then the triad is major. The distance between X and Z, accordingly, equals 7 semitones.A minor triad is different in that the distance between X and Y should be 3 semitones and between Y and Z \u2014 4 semitones.For example, the triad \"C E G\" is major: between C and E are 4 semitones, and between E and G are 3 semitones. And the triplet \"C# B F\" is minor, because if we order the notes as \"B C# F\", than between B and C# will be 3 semitones, and between C# and F \u2014 4 semitones.Help Vasya classify the triad the teacher has given to him.", "input_spec": "The only line contains 3 space-separated notes in the above-given notation.", "output_spec": "Print \"major\" if the chord is major, \"minor\" if it is minor, and \"strange\" if the teacher gave Vasya some weird chord which is neither major nor minor. Vasya promises you that the answer will always be unambiguous. That is, there are no chords that are both major and minor simultaneously.", "sample_inputs": ["C E G", "C# B F", "A B H"], "sample_outputs": ["major", "minor", "strange"], "notes": null}, "src_uid": "6aa83c2f6e095848bc63aba7d013aa58"}
{"nl": {"description": "Polycarp invited all his friends to the tea party to celebrate the holiday. He has n cups, one for each of his n friends, with volumes a1,\u2009a2,\u2009...,\u2009an. His teapot stores w milliliters of tea (w\u2009\u2264\u2009a1\u2009+\u2009a2\u2009+\u2009...\u2009+\u2009an). Polycarp wants to pour tea in cups in such a way that:  Every cup will contain tea for at least half of its volume  Every cup will contain integer number of milliliters of tea  All the tea from the teapot will be poured into cups  All friends will be satisfied. Friend with cup i won't be satisfied, if there exists such cup j that cup i contains less tea than cup j but ai\u2009>\u2009aj.For each cup output how many milliliters of tea should be poured in it. If it's impossible to pour all the tea and satisfy all conditions then output -1.", "input_spec": "The first line contains two integer numbers n and w (1\u2009\u2264\u2009n\u2009\u2264\u2009100, ). The second line contains n numbers a1,\u2009a2,\u2009...,\u2009an (1\u2009\u2264\u2009ai\u2009\u2264\u2009100).", "output_spec": "Output how many milliliters of tea every cup should contain. If there are multiple answers, print any of them. If it's impossible to pour all the tea and satisfy all conditions then output -1.", "sample_inputs": ["2 10\n8 7", "4 4\n1 1 1 1", "3 10\n9 8 10"], "sample_outputs": ["6 4", "1 1 1 1", "-1"], "notes": "NoteIn the third example you should pour to the first cup at least 5 milliliters, to the second one at least 4, to the third one at least 5. It sums up to 14, which is greater than 10 milliliters available."}, "src_uid": "5d3bb9e03f4c5c8ecb6233bd5f90f3a3"}
{"nl": {"description": "You have two integers $$$l$$$ and $$$r$$$. Find an integer $$$x$$$ which satisfies the conditions below:  $$$l \\le x \\le r$$$.  All digits of $$$x$$$ are different. If there are multiple answers, print any of them.", "input_spec": "The first line contains two integers $$$l$$$ and $$$r$$$ ($$$1 \\le l \\le r \\le 10^{5}$$$).", "output_spec": "If an answer exists, print any of them. Otherwise, print $$$-1$$$.", "sample_inputs": ["121 130", "98766 100000"], "sample_outputs": ["123", "-1"], "notes": "NoteIn the first example, $$$123$$$ is one of the possible answers. However, $$$121$$$ can't be the answer, because there are multiple $$$1$$$s on different digits.In the second example, there is no valid answer."}, "src_uid": "3041b1240e59341ad9ec9ac823e57dd7"}
{"nl": {"description": "In the city of Saint Petersburg, a day lasts for $$$2^{100}$$$ minutes. From the main station of Saint Petersburg, a train departs after $$$1$$$ minute, $$$4$$$ minutes, $$$16$$$ minutes, and so on; in other words, the train departs at time $$$4^k$$$ for each integer $$$k \\geq 0$$$. Team BowWow has arrived at the station at the time $$$s$$$ and it is trying to count how many trains have they missed; in other words, the number of trains that have departed strictly before time $$$s$$$. For example if $$$s = 20$$$, then they missed trains which have departed at $$$1$$$, $$$4$$$ and $$$16$$$. As you are the only one who knows the time, help them!Note that the number $$$s$$$ will be given you in a binary representation without leading zeroes.", "input_spec": "The first line contains a single binary number $$$s$$$ ($$$0 \\leq s < 2^{100}$$$) without leading zeroes.", "output_spec": "Output a single number\u00a0\u2014 the number of trains which have departed strictly before the time $$$s$$$.", "sample_inputs": ["100000000", "101", "10100"], "sample_outputs": ["4", "2", "3"], "notes": "NoteIn the first example $$$100000000_2 = 256_{10}$$$, missed trains have departed at $$$1$$$, $$$4$$$, $$$16$$$ and $$$64$$$.In the second example $$$101_2 = 5_{10}$$$, trains have departed at $$$1$$$ and $$$4$$$.The third example is explained in the statements."}, "src_uid": "d8ca1c83b431466eff6054d3b422ab47"}