#include <bits/stdc++.h>
#define _GLIBCXX_DEBUG
using namespace std;
using ll = long long;
using vec = vector<ll>;
using vect = vector<double>;
using Graph = vector<vector<ll>>;
#define loop(i, n) for (ll i = 0; i < n; i++)
#define Loop(i, m, n) for (ll i = m; i < n; i++)
#define pool(i, n) for (ll i = n; i >= 0; i--)
#define Pool(i, m, n) for (ll i = n; i >= m; i--)
#define mod 1000000007ll
//#define mod 998244353ll
#define flagcount __builtin_popcount
#define flag(x) (1ll << x)
#define flagadd(bit, x) bit |= flag(x)
#define flagpop(bit, x) bit &= ~flag(x)
#define flagon(bit, i) bit &flag(i)
#define flagoff(bit, i) !(bit & (1ll << i))
#define all(v) v.begin(), v.end()
#define low2way(v, x) lower_bound(all(v), x)
#define high2way(v, x) upper_bound(all(v), x)
#define idx_lower(v, x) (distance(v.begin(), low2way(v, x)))  //配列vでx未満の要素数を返す
#define idx_upper(v, x) (distance(v.begin(), high2way(v, x))) //配列vでx以下の要素数を返す
#define idx_lower2(v, x) (v.size() - idx_lower(v, x))         //配列vでx以上の要素数を返す
#define idx_upper2(v, x) (v.size() - idx_upper(v, x))         //配列vでxより大きい要素の数を返す
#define putout(a) cout << a << endl
#define Sum(v) accumulate(all(v), 0ll)
#define gcd(x, y) __gcd(x, y)
ll ctoi(char c)
{
    if (c >= '0' && c <= '9')
    {
        return c - '0';
    }
    return -1;
}
template <typename T>
T lcm(T x, T y)
{
    T z = gcd(x, y);
    return x * y / z;
}
template <typename T>
bool primejudge(T n)
{
    if (n < 2)
        return false;
    else if (n == 2)
        return true;
    else if (n % 2 == 0)
        return false;
    double sqrtn = sqrt(n);
    for (T i = 3; i < sqrtn + 1; i++)
    {
        if (n % i == 0)
        {
            return false;
        }
        i++;
    }
    return true;
}
template <typename T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b; // aをbで更新
        return true;
    }
    return false;
}
template <typename T>
bool chmin(T &a, const T &b)
{
    if (a > b)
    {
        a = b; // aをbで更新
        return true;
    }
    return false;
}
//場合によって使い分ける
//const ll dx[4]={1,0,-1,0};
//const ll dy[4]={0,1,0,-1};
const ll dx[8] = {1, 1, 0, -1, -1, -1, 0, 1};
const ll dy[8] = {0, 1, 1, 1, 0, -1, -1, -1};
//2次元配列の宣言
//vector<vector<ll>> field(h, vector<ll>(w));
template <typename T>
struct BIT
{
    int n;            // 要素数
    vector<T> bit[2]; // データの格納先
    BIT(int n_) { init(n_); }
    void init(int n_)
    {
        n = n_ + 1;
        for (int p = 0; p < 2; p++)
            bit[p].assign(n, 0);
    }

    void add_sub(int p, int i, T x)
    {
        for (int idx = i; idx < n; idx += (idx & -idx))
        {
            bit[p][idx] += x;
        }
    }
    void add(int l, int r, T x)
    { // [l,r) に加算
        add_sub(0, l, -x * (l - 1));
        add_sub(0, r, x * (r - 1));
        add_sub(1, l, x);
        add_sub(1, r, -x);
    }

    T sum_sub(int p, int i)
    {
        T s(0);
        for (int idx = i; idx > 0; idx -= (idx & -idx))
        {
            s += bit[p][idx];
        }
        return s;
    }
    T sum(int i) { return sum_sub(0, i) + sum_sub(1, i) * i; }

    // [l,r) の区間和を取得
    T query(int l, int r) { return sum(r - 1) - sum(l - 1); }
};
int main()
{
    ll N, Q;
    cin >> N >> Q;
    vec A(N);
    loop(i, N) cin >> A[i];
    vec L(Q), R(Q), ind(Q);
    vector<pair<ll, ll>> pairs(Q);
    loop(i, Q)
    {
        cin >> L[i] >> R[i];
        pairs[i] = make_pair(R[i], i);
    }
    sort(all(pairs));
    loop(i, Q)
    {
        ind[i] = pairs[i].second;
    }
    BIT<ll> data(N + 10);
    vector<ll> las(N + 1, 0);
    vector<ll> ans(Q);
    ll RR = 0;
    loop(i, Q)
    {
        ll idx = ind[i];
        Loop(j, RR, R[idx])
        {
            data.add(las[A[j]] + 1, j + 2, 1);
            las[A[j]] = j + 1;
        }
        RR = R[idx];
        ll z = data.query(L[idx], L[idx] + 1);
        ans[idx] = z;
    }
    loop(i, Q) putout(ans[i]);
    return 0;
}

Measured memory_bytes: 42892