#include <bits/stdc++.h>
using namespace std;
// #define LOCAL // 提出時はコメントアウト
#define DEBUG_

typedef long long ll;
const double EPS = 1e-9;
const ll INF = ((1LL<<62)-(1LL<<31));
typedef vector<ll> vecl;
typedef pair<ll, ll> pairl;
template<typename T, typename U> using mapv = map<T,vector<U>>;

#define ALL(v) v.begin(), v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i, n) REP(i, 0, n)
#define contains(S,x) find(ALL(S),x) != S.end()
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> vector<vector<T>> genarr(ll n, ll m, T init) { return vector<vector<T>>(n,vector<T>(m,init)); }

///// DEBUG
#define DUMPOUT cerr
#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)
template<typename T>istream&operator>>(istream&is,vector<T>&vec){for(T&x:vec)is>>x;return is;}
template<typename T,typename U>ostream&operator<<(ostream&os,pair<T,U>&pair_var){os<<"("<<pair_var.first<<", "<<pair_var.second<<")";return os;}
template<typename T>ostream&operator<<(ostream&os,const vector<T>&vec){os<<"{";for(int i=0;i<vec.size();i++){os<<vec[i]<<(i+1==vec.size()?"":", ");}
os<<"}";return os;}
template<typename T,typename U>ostream&operator<<(ostream&os,map<T,U>&map_var){os<<"{";repi(itr,map_var){os<<*itr;itr++;if(itr!=map_var.end())os<<", ";itr--;}
os<<"}";return os;}
template<typename T>ostream&operator<<(ostream&os,set<T>&set_var){os<<"{";repi(itr,set_var){os<<*itr;itr++;if(itr!=set_var.end())os<<", ";itr--;}
os<<"}";return os;}
void dump_func(){DUMPOUT<<endl;}
template<class Head,class...Tail>void dump_func(Head&&head,Tail&&...tail){DUMPOUT<<head;if(sizeof...(Tail)>0){DUMPOUT<<", ";}
dump_func(std::move(tail)...);}
#ifndef LOCAL
#undef DEBUG_
#endif
#ifdef DEBUG_
#define DEB
#define dump(...)                                                          \
DUMPOUT << "  " << string(#__VA_ARGS__) << ": "                            \
        << "[" << to_string(__LINE__) << ":" << __FUNCTION__ << "]"        \
        << endl                                                            \
        << "    ",                                                         \
    dump_func(__VA_ARGS__)
#else
#define DEB if (false)
#define dump(...)
#endif

//////////

struct Mo { // O(k(N+Q)√N)
    int n;
    vector<pair<int, int> > lr;

    explicit Mo(int n) : n(n) {}

    // クエリの半開区間[l,r)をaddする
    void add(int l, int r) {
        lr.emplace_back(l, r);
    }


    // sqrt(N)の区間でソートして、要素変更時にadd, eraseを、クエリ完遂時にout(クエリの番号)を呼ぶ
    template <typename AL, typename AR, typename EL, typename ER, typename O>
    void build(const AL &add_left, const AR &add_right, const EL &erase_left,
               const ER &erase_right, const O &out) {
        int q = (int)lr.size();
        int bs = n / min<int>(n, sqrt(q));
        vector<int> ord(q);
        iota(begin(ord), end(ord), 0);
        sort(begin(ord), end(ord), [&](int a, int b) {
            int ablock = lr[a].first / bs, bblock = lr[b].first / bs;
            if (ablock != bblock) return ablock < bblock;
            return (ablock & 1) ? lr[a].second > lr[b].second
                                : lr[a].second < lr[b].second;
        });
        int l = 0, r = 0;
        for (auto idx : ord) {
            while (l > lr[idx].first) add_left(--l);
            while (r < lr[idx].second) add_right(r++);
            while (l < lr[idx].first) erase_left(l++);
            while (r > lr[idx].second) erase_right(--r);
            out(idx);
        }
    }

    template <typename A, typename E, typename O>
    void build(const A &add, const E &erase, const O &out) {
        build(add, add, erase, erase, out);
    }
};


int main() {
    #ifdef LOCAL
    ifstream in("../../Atcoder/input.txt");
    cin.rdbuf(in.rdbuf());
    #endif

    ll N,Q;
    cin>>N>>Q;
    vecl C(N);
    rep(i,N) {
        cin>>C[i];
    }

    Mo mo(N+1);
    vector<pairl> query(Q);
    rep(i,Q) {
        cin>>query[i].first>>query[i].second; // [l,r)
        query[i].first--;
        mo.add(query[i].first,query[i].second);
    }  
    
    vecl count(N+1,0);
    ll sum = 0;
    vecl ans(Q,0);

    auto add = [&count,&sum,&C](auto _id) {
        auto id = C[_id];
        count[id]++;
        if (count[id] == 1) {
            sum++;
        }
    };

    auto erase = [&count,&sum,&C](auto _id) {
        auto id = C[_id];
        count[id]--;
        if (count[id] == 0) {
            sum--;
        }
    };

    auto out = [&ans,&sum](auto query_id) {
        ans[query_id] = sum;
    };

    mo.build(add,erase,out);
    
    rep(q,Q) {
        cout << ans[q] << endl;
    }

    return 0;
}


Measured memory_bytes: 29172