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// #pragma GCC optimize(2)
// #pragma GCC optimize(3)
// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
// #pragma GCC target("avx,avx2,fma")
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
typedef pair<ll, ll> ppl;
#define ain(a,n) for(ll i=0;i<(n);++i)	cin>>(a)[i];
#define DEBUG(x) cout << '>' << #x << ':' << x << endl;
#define loop(i,n) for(ll i=0;i<(n);++i)
#define FOR(i,a,b) for(ll i=(a);i<=(b);++i)
#define FORD(i,a,b) for(ll i=(a);i>=(b);--i)
#define cases ll T=0;cin>>T;while(T--)
#define ff first
#define ss second
#define all(v) v.begin(),v.end()
#define END "\n"
#define pb push_back
#define mp make_pair
#define go(c,itr) for(auto itr=(c).begin(); itr!=(c).end(); ++itr)
// #define back(c,itr) for(auto itr=(c).rbegin(); itr!=(c).rend(); ++itr)
#define PI 3.14159265359
#define inf 9e18
#define MOD 1000000007
#define MODU 998244353
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define MAXN 500005
const ll B = 707;
#define block(i) (i/B)
const string alpha = "abcdefghijklmnopqrstuvwxyz";
const ll N = 200005;
const long double epsilon = 1e-9;
ll binexp(ll a, ll b, ll m) {
	a %= m;
	ll res = 1;
	while (b > 0) {
		if (b & 1)
			res = res * a % m;
		a = a * a % m;
		b >>= 1;
	}
	return res;
}
ll modinvfermat(ll a, ll m)
{
	return binexp(a, m - 2, m);
}
void task(bool flag)
{
	if (flag)
		cout << "YES\n";
	else
		cout << "NO\n";
}
ll lcm(ll a, ll b)
{
	return ((1LL * a * b) / (__gcd(a, b)));
}

struct query {
	int l;
	int r;
	int i;
  	bool operator < (const query& q) {
        if(block(l) != block(q.l)) return block(l) < block(q.l);
        return (block(l) & 1) ? (r < q.r) : (r > q.r);
    }
};
vector<query> Q(MAXN);
vl ar(MAXN), ans(MAXN), fre(MAXN);
ll cnt = 0;

void add(int pos)
{
	fre[ar[pos]]++;
	if (fre[ar[pos]] == 1)
		cnt++;
}

void remove(int pos)
{
	fre[ar[pos]]--;
	if (fre[ar[pos]] == 0)
		cnt--;
}

signed main() {
// #ifndef ONLINE_JUDGE
// 	freopen("input.txt", "r", stdin);
// 	freopen("output.txt", "w", stdout);
// #endif
	fast
	ll n , q;
	cin >> n >> q;
	ain(ar, n);
	loop(i, q)
	{
		cin >> Q[i].l >> Q[i].r;
		Q[i].i = i , Q[i].l-- , Q[i].r--;
	}

	sort(Q.begin() , Q.begin() + q);
	ll ML = 0 , MR = -1;
	loop(i, q)
	{
		int L = Q[i].l;
		int R = Q[i].r;

		while (ML > L)
			ML-- , add(ML);

		while (MR < R)
			MR++ , add(MR);

		while (ML < L)
			remove(ML) , ML++;

		while (MR > R)
			remove(MR) , MR--;

		ans[Q[i].i] = cnt;
	}

	loop(i, q)	cout << ans[i] << END;



// #ifndef ONLINE_JUDGE
// 	cout << "\nTime Elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " sec\n";
// #endif
	return 0;
}


Measured memory_bytes: 21280