#pragma region template 2.4
#include <bits/stdc++.h>
using namespace std;
template <typename T>
using pq_asc = priority_queue<T, vector<T>, greater<T>>;
typedef long long ll;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> ii;
typedef vector<ii> vii;
typedef vector<string> vs;
#define REP(i, n) for (ll i = 0; i < (n); ++i)
#define REP1(i, n) for (ll i = 1; i <= (n); ++i)
#define FOR(i, a) for (auto &i : a)
#define CH(f, x, y) x = f(x, y)
#define IN(T, x) \
    T x;         \
    cin >> x;
#define AIN(T, a, n) \
    vector<T> a(n);  \
    FOR(i, a)        \
    cin >> i;
#define A2IN(T1, a, T2, b, n) \
    vector<T1> a(n);          \
    vector<T2> b(n);          \
    REP(i, n)                 \
    cin >> a[i] >> b[i];
#define OUT(x) cout << (x) << endl;
#define FOUT(x) cout << fixed << setprecision(15) << (x) << endl;
#define ALL(a) (a).begin(), (a).end()
#define SORT(a) sort(ALL(a))
#define RSORT(a) \
    SORT(a);     \
    reverse(ALL(a))
#define DUMP(x) cout << #x << " = " << (x) << endl;
#define DUMPA(a)          \
    cout << #a << " = {"; \
    JOUT(ALL(a), ", ", cout) << "}" << endl;

template <typename T>
ostream &JOUT(T s, T e, string sep = " ", ostream &os = cout)
{
    if (s != e)
    {
        os << *s;
        ++s;
    }
    while (s != e)
    {
        os << sep << *s;
        ++s;
    }
    return os;
}

ostream &YES(bool cond, string yes = "Yes", string no = "No", ostream &os = cout)
{
    if (cond)
    {
        os << yes << endl;
    }
    else
    {
        os << no << endl;
    }
    return os;
}

template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p)
{
    os << '(' << p.first << ", " << p.second << ')';
    return os;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v)
{
    os << '[';
    JOUT(ALL(v), ", ", os) << ']';
    return os;
}

const ll INF = 1e18;
const ll MOD = 1e9 + 7;
#pragma endregion template
#pragma region bit 1.0
template <typename T>
struct bit
{
    ll n;
    vector<T> a;

    bit() {}

    bit(ll n) : n(n)
    {
        a.assign(n + 1, 0);
    }

    void add(ll i, T x)
    {
        ++i;
        while (i <= n)
        {
            a[i] += x;
            i += i & -i;
        }
    }

    T sum(ll i)
    {
        T s = 0;
        while (i > 0)
        {
            s += a[i];
            i -= i & -i;
        }
        return s;
    }
};
#pragma endregion bit

int main()
{
    IN(ll, N);
    IN(ll, Q);
    AIN(ll, c, N);
    A2IN(ll, l, ll, r, Q);
    vvi G(N + 1);
    REP(i, N)
    {
        G[c[i]].push_back(i + 1);
    }
    REP(i, N + 1)
    {
        reverse(ALL(G[i]));
    }
    bit<ll> bit(N + 1);
    REP(i, N)
    {
        if (i + 1 == G[c[i]].back())
        {
            bit.add(i + 1, 1);
        }
    }
    vector<tuple<ll, ll, ll>> p(Q);
    REP(i, Q)
    {
        p[i] = {l[i], r[i], i};
    }
    SORT(p);
    ll j = 1;
    vi ans(Q);
    REP(i, Q)
    {
        auto [L, R, q] = p[i];
        while (j < L)
        {
            bit.add(j, -1);
            G[c[j - 1]].pop_back();
            if (!G[c[j - 1]].empty())
            {
                bit.add(G[c[j - 1]].back(), 1);
            }
            ++j;
        }
        ans[q] = bit.sum(R + 1);
    }
    REP(i, Q)
    {
        OUT(ans[i]);
    }
}

Measured memory_bytes: 62404