// #define _GLIBCXX_DEBUG // for STL debug (optional)
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <cfloat>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <fstream>
#include <functional>
#include <bitset>
using namespace std;
using ll = long long int;
using int64 = long long int;
 
template<typename T> void chmax(T &a, T b) {a = max(a, b);}
template<typename T> void chmin(T &a, T b) {a = min(a, b);}
template<typename T> void chadd(T &a, T b) {a = a + b;}
 
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
const int INF = 1LL << 29;
const ll LONGINF = 1LL << 60;
const ll MOD = 1000000007LL;

// @category セグメント木 (Segment Tree)
// @title セグメント木 (Segment Tree)
// 抽象 SegmentTree (0-indexed・一点更新・区間取得)
template <typename MonoidType>
struct SegmentTree {
    using Function = function< MonoidType(MonoidType, MonoidType) >;

    // node, identity element
    int n;
    vector<MonoidType> node;
    MonoidType E0;

    // update / combine function
    Function upd_f, cmb_f;

    void build(int m, vector<MonoidType> v = vector<MonoidType>()) {
        if(v != vector<MonoidType>()) m = v.size();
        n = 1; while(n < m) n *= 2;

        node = vector<MonoidType>(2*n-1, E0);
        if(v != vector<MonoidType>()) {
            for(int i=0; i<m; i++) {
                node[n-1+i] = v[i];
            }
            for(int i=n-2; i>=0; i--) {
                node[i] = cmb_f(node[2*i+1], node[2*i+2]);
            }
        }
    }

    // initialize
    SegmentTree() {}
    SegmentTree(int n_, MonoidType E0_,
                Function upd_f_, Function cmb_f_,
                vector<MonoidType> v = vector<MonoidType>()) :
        E0(E0_), upd_f(upd_f_), cmb_f(cmb_f_) {
        build(n_, v);
    }

    // update k-th element (applied value: x)
    void update(int k, MonoidType x) {
        k += n - 1;
        node[k] = upd_f(node[k], x);
        while(k > 0) {
            k = (k - 1) / 2;
            node[k] = cmb_f(node[2*k+1], node[2*k+2]);
        }
    }

    // range query for [a, b)
    // 非再帰のアイデア: http://d.hatena.ne.jp/komiyam/20131202/1385992406
    MonoidType query(int a, int b) {
        MonoidType vl = E0, vr = E0;
        for(int l=a+n, r=b+n; l<r; l>>=1, r>>=1) {
            if(l & 1) vl = cmb_f(vl, node[(l++)-1]);
            if(r & 1) vr = cmb_f(node[(--r)-1], vr);
        }
        return cmb_f(vl, vr);
    }
};

int main() {
    int N, Q; scanf("%d%d", &N, &Q);
    vector<int> A(N);
    vector< vector<int> > vals(N);
    for(int i=0; i<N; i++) {
        scanf("%d", &A[i]), A[i]--;
        vals[ A[i] ].emplace_back(i);
    }

    SegmentTree<int> seg(N, 0,
                         [](int a, int b) { return a + b; },
                         [](int a, int b) { return a + b; });
    vector<int> ptr(N);
    for(int i=0; i<N; i++) {
        if(ptr[i] < vals[i].size()) seg.update(vals[i][ ptr[i]++ ], +1);
    }
    
    vector< vector< pair<int, int> > > queries(N);
    for(int i=0; i<Q; i++) {
        int l, r; scanf("%d%d", &l, &r);
        l--;
        queries[l].emplace_back(r, i);        
    }

    vector<int> ans(Q);
    for(int l=0; l<N; l++) {
        for(auto q : queries[l]) {
            int r, k; tie(r, k) = q;
            // fprintf(stderr, "k = %d\n", k);
            ans[k] = seg.query(l, r);
        }

        int v = A[l];
        if(vals[v].size()) {
            seg.update(vals[v][ ptr[v] - 1 ], -1);
        }
        if(ptr[v] < vals[v].size()) {
            seg.update(vals[v][ ptr[v]++ ], +1);
        }
        // for(int i=0; i<N; i++) fprintf(stderr, "%d ", seg.query(i, i+1));
        // fprintf(stderr, "\n");
    }
    for(int i=0; i<Q; i++) printf("%d\n", ans[i]);
    return 0;
}


Measured memory_bytes: 62704