<commit_before>package main

import (
	"fmt"
	"sort"
)

func threeSum(nums []int) [][]int {

	if len(nums) < 3 {
		return make([][]int, 0)
	}

	uniq := make([]int, 0)
	count := make([]int, 0)

	sort.Ints(nums)
	n := len(nums)
	cur := nums[0] - 1
	curCount := 1
	for i := 0; i < n; i++ {
		if nums[i] == cur {
			curCount++
		} else {
			uniq = append(uniq, cur)
			count = append(count, curCount)
			cur = nums[i]
			curCount = 1
		}
	}
	uniq = append(uniq, cur)
	count = append(count, curCount)
	uniq = uniq[1:]
	count = count[1:]
	n = len(uniq)

	rangeExisted := make([]map[int]bool, n)
	// rangeExisted[i][v] means v existed in range [i+1, n)
	for i := 0; i < n; i++ {
		rangeExisted[i] = make(map[int]bool)
		for j := i + 1; j < n; j++ {
			rangeExisted[i][uniq[j]] = true
		}
	}

	result := make([][]int, 0)
	var sum1, sum2 int
	// each number appear exactly once
	for i := 0; i < n-2; i++ {
		sum1 = uniq[i]
		if sum1 > 0 {
			break
		}

		for j := i + 1; j < n-1; j++ {
			sum2 = sum1 + uniq[j]
			if sum2 > 0 {
				break
			}
			if rangeExisted[j][0-sum2] {
				result = append(result, []int{uniq[i], uniq[j], 0 - sum2})
			}
		}
	}

	existed := make(map[int]bool, 0)
	for i := 0; i < n; i++ {
		existed[uniq[i]] = true
		// fmt.Printf("v = %d, count = %d\n", uniq[i], count[i])
	}

	// some number repeat 2 times
	for i := 0; i < n; i++ {
		if count[i] >= 2 {
			sum2 = uniq[i] + uniq[i]
			if existed[0-sum2] {
				if uniq[i] == 0 {
					// 0 repeat 3 times
					if count[i] >= 3 {
						result = append(result, []int{0, 0, 0})
					}
				} else {
					result = append(result, []int{uniq[i], uniq[i], 0 - sum2})
				}
			}
		}
	}

	return result
}

func main() {
	fmt.Println(threeSum([]int{-1, 0, 1, 2, -1, 4}))
	fmt.Println(threeSum([]int{0, 0, 0, 0}))
	fmt.Println(threeSum([]int{-1, -1, 2, -4, 2}))
	fmt.Println(threeSum([]int{-1, 2, -4, 2}))
	fmt.Println(threeSum([]int{-1, -1, 2, -4}))
	fmt.Println(threeSum([]int{}))
	fmt.Println(threeSum([]int{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}))
}<commit_msg>3sum: n^2 solution from wikipedia<commit_after>package main

import (
	"fmt"
	"sort"
)

func threeSum(nums []int) [][]int {

	if len(nums) < 3 {
		return make([][]int, 0)
	}

	sort.Ints(nums)
	n := len(nums)
	result := make([][]int, 0)
	for i := 0; i < n-2; i++ {
		if i > 0 && nums[i] == nums[i-1] {
			continue
		}
		j := i + 1
		k := n - 1
		for j < k {
			s := nums[i] + nums[j] + nums[k]
			if s == 0 {
				result = append(result, []int{nums[i], nums[j], nums[k]})
				j++
				for j < k && nums[j] == nums[j-1] {
					j++
				}
				k--
				for j < k && nums[k] == nums[k+1] {
					k--
				}
			} else if s > 0 {
				k--
				for j < k && nums[k] == nums[k+1] {
					k--
				}
			} else {
				j++
				for j < k && nums[j] == nums[j-1] {
					j++
				}
			}
		}
	}

	return result
}

func main() {
	fmt.Println(threeSum([]int{-1, 0, 1, 2, -1, 4}))
	fmt.Println(threeSum([]int{0, 0, 0, 0}))
	fmt.Println(threeSum([]int{-1, -1, 2, -4, 2}))
	fmt.Println(threeSum([]int{-1, 2, -4, 2}))
	fmt.Println(threeSum([]int{-1, -1, 2, -4}))
	fmt.Println(threeSum([]int{}))
	fmt.Println(threeSum([]int{-2, 0, 0, 2, 2}))
	fmt.Println(threeSum([]int{-2, 0, 1, 1, 2}))
}
{'fraction_non_alphanumeric': 0.307064545379606, 'fraction_numerical': 0.2573571840738604, 'mean_word_length': 2.1219763252702006, 'pattern_counts': {'":': 0, '<': 18, '<?xml version=': 0, '>': 9, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '715181', 'n_tokens_mistral': 10691, 'n_tokens_neox': 7451, 'n_words': 3351}