We have N colored balls arranged in a row from left to right; the color of the i-th ball from the left is c_i.

You are given Q queries. The i-th query is as follows: how many different colors do the l_i-th through r_i-th balls from the left have?

Constraints

* 1\leq N,Q \leq 5 \times 10^5
* 1\leq c_i \leq N
* 1\leq l_i \leq r_i \leq N
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


N Q
c_1 c_2 \cdots c_N
l_1 r_1
l_2 r_2
:
l_Q r_Q


Output

Print Q lines. The i-th line should contain the response to the i-th query.

Examples

Input

4 3
1 2 1 3
1 3
2 4
3 3


Output

2
3
1


Input

10 10
2 5 6 5 2 1 7 9 7 2
5 5
2 4
6 7
2 2
7 8
7 9
1 8
6 9
8 10
6 8


Output

1
2
2
1
2
2
6
3
3
3
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)
class Query:
    def __init__(self, r,l, idx):
        self.l = l
        self.r = r
        self.idx = idx

def solve(case):
    n,q = map(int,input().split())
    c = list(map(int,input().split()))
    query = []
    for i in range(q):
        l,r = map(int,input().split())
        query.append(Query(r,l,i))

    query.sort(key = lambda x:x.r)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind].r == i+1):
            ans[query[ind].idx] = (bit.sum(i+1) - bit.sum(query[ind].l-1))
            ind+=1

    # print('\n'.join(str(ans[i]) for i in range(len(ans))))
    for i in range(q):
        print(ans[i])
solve(1)
