#include <algorithm>
#include <iostream>
#include <stack>
#include <queue>
#include <cmath>
#include <string>
#include <iterator>
#include <map>
#include <set>
#include <iomanip>
#include <vector>
#include <cstdint>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Graph = vector<vector<int>>;
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};
#define rep(i, N) for(int i = 0; i < N; i++)
#define rep2(i, l, r) for (ll i = (ll)l; i < (ll)(r); i++)
#define INF 1000000000000000000
#define MAX 200001

const int MOD = 1000000007;

template <typename T > inline string toString(const T &a) {ostringstream oss; oss << a; return oss.str();};

template<int MOD> struct Fp {
    long long val;
    constexpr Fp(long long v = 0) noexcept : val(v % MOD) {
        if (val < 0) v += MOD;
    }
    constexpr int getmod() { return MOD; }
    constexpr Fp operator - () const noexcept {
        return val ? MOD - val : 0;
    }
    constexpr Fp operator + (const Fp& r) const noexcept { return Fp(*this) += r; }
    constexpr Fp operator - (const Fp& r) const noexcept { return Fp(*this) -= r; }
    constexpr Fp operator * (const Fp& r) const noexcept { return Fp(*this) *= r; }
    constexpr Fp operator / (const Fp& r) const noexcept { return Fp(*this) /= r; }
    constexpr Fp& operator += (const Fp& r) noexcept {
        val += r.val;
        if (val >= MOD) val -= MOD;
        return *this;
    }
    constexpr Fp& operator -= (const Fp& r) noexcept {
        val -= r.val;
        if (val < 0) val += MOD;
        return *this;
    }
    constexpr Fp& operator *= (const Fp& r) noexcept {
        val = val * r.val % MOD;
        return *this;
    }
    constexpr Fp& operator /= (const Fp& r) noexcept {
        long long a = r.val, b = MOD, u = 1, v = 0;
        while (b) {
            long long t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        val = val * u % MOD;
        if (val < 0) val += MOD;
        return *this;
    }
    constexpr bool operator == (const Fp& r) const noexcept {
        return this->val == r.val;
    }
    constexpr bool operator != (const Fp& r) const noexcept {
        return this->val != r.val;
    }
    friend constexpr ostream& operator << (ostream &os, const Fp<MOD>& x) noexcept {
        return os << x.val;
    }
    friend constexpr istream& operator >> (istream &is, Fp<MOD>& x) noexcept {
        return is >> x.val;
    }
    friend constexpr Fp<MOD> modpow(const Fp<MOD> &a, long long n) noexcept {
        if (n == 0) return 1;
        auto t = modpow(a, n / 2);
        t = t * t;
        if (n & 1) t = t * a;
        return t;
    }
};

using mint = Fp<MOD>;
int bit[500005], N;

int sum(int a){
    int res = 0;
    for(int x = a; x > 0; x-=x&-x) res += bit[x];
    return res;
}

void add(int a, int w){
    for(int x = a; x <= N; x+=x&-x) bit[x] += w;
}

int main(){
    int Q;
    cin >> N >> Q;
    vector<int> c(N);
    vector<tuple<int,int,int>> rl(Q);
    vector<int> ans(Q);
    rep(i,N) cin >> c[i];
    rep(i,Q) {int r,l; cin >> l >> r; rl[i] = {r,l,i};}
    sort(rl.begin(), rl.end());
    int idx = 0;
    vector<int> tama(N+1,0);
    for(int i = 1; i < N+1; i++){
        if(tama[c[i-1]] == 0){
            add(i,1);
        }
        else{
            add(tama[c[i-1]],-1);
            add(i,1);
        }
        tama[c[i-1]] = i;
        while(get<0>(rl[idx]) == i) {
            int r = get<0>(rl[idx]);
            int l = get<1>(rl[idx]);
            ans[get<2>(rl[idx])] = sum(r) - sum(l-1);
            idx++;
        }
    }
    for(auto a:ans) cout << a << endl;
}


Measured memory_bytes: 17424