/**
* author: TomDev - Tran Hoang Quan
* created: 2026-04-19 07:30:12
* country: Vietnam - VNM
* ----------------------------------------------------------
* title: COCI 2016/2017 - Contest 5 - Poklon
* source: https://oj.uz/problem/view/COCI17_poklon
* submission:
* status: WIP
* ----------------------------------------------------------
* tags:
* complexity:
* note:
**/
#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdio>
#include <utility>
using namespace std;
// --- [ DEBUGGING & LOCAL CONFIG ] ---
#if __has_include("TomDev.h") && defined(LOCAL)
#include "TomDev.h"
#define dbg(x,i) cerr << "BreakPoint(" << i << ") -> " << #x << " = " << (x) << '\n'
#else
#define dbg(x,i)
#endif
#define NAH_I_WOULD_WIN 0
// --- [ MACROS ] ---
#define all(x,bonus) (x).begin()+(bonus),(x).end()
#define range(x,st,ed) (x).begin()+(st),(x).begin()+(ed)+1
#define filter(x,bonus) (x).erase(unique((x).begin()+(bonus), (x).end()), (x).end())
#define rall(x,bonus) (x).rbegin(),(x).rend()-(bonus)
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);
#define fi first
#define se second
#define eb emplace_back
#define sz(x) (int)(x).size()
// --- [ TYPES & ALIASES ] ---
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pll = pair<long long,long long>;
using pld = pair<long double,long double>;
using pii = pair<int,int>;
using pill = pair<int,long long>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vll = vector<long long>;
using vvll = vector<vector<long long>>;
using vpii = vector<pair<int,int>>;
using vpill = vector<pair<int,long long>>;
using vpll = vector<pair<long long,long long>>;
void setup(){
if(!fopen("COCI17_poklon.INP", "r")) return;
freopen("COCI17_poklon.INP", "r", stdin);
freopen("COCI17_poklon.OUT", "w", stdout);
}
// ----------------------- [ CONFIG & CONSTANTS ] -----------------------
const int N = 5e5+2;
int n,q;
int suff[N], pos[N], pos2[N], a[N], pre[N], bit[N], ans[N];
struct Query{
int l,r,id;
Query(int _l = 0, int _r = 0, int _id = 0) : l(_l), r(_r), id(_id) {};
bool operator<(const Query& other){
return l < other.l;
}
};
// ----------------------- [ FUNCTIONS ] -----------------------
void update(int x, int val){
for(; x <= n; x += x&-x){
bit[x] += val;
}
}
int get(int x){
int res = 0;
for(; x ; x -= x&-x) res += bit[x];
return res;
}
int query(int l, int r){
return get(r) - get(l-1);
}
// ----------------------- [ MAIN ] -----------------------
int main(){
fastio;
setup();
cin >> n >> q;
for(int i = 1; i<= n; i++) cin >> a[i];
for(int i = 1; i <= n; i++) suff[i] = n+1, pos[a[i]] = pos2[a[i]] = n+1;
for(int i = n; i >= 1; i--){
if(pos[a[i]] && pos2[a[i]]) suff[i] = pos2[a[i]];
pos2[a[i]] = pos[a[i]];
pre[i] = pos[a[i]];
pos[a[i]] = i;
}
for(int i = 1; i <= n; i++){
if(pos[a[i]] == i){
update(pre[i], 1);
update(suff[i], -1);
}
}
vector<Query> queries(q+1);
for(int i = 1; i <= q; i++){
cin >> queries[i].l >> queries[i].r;
queries[i].id = i;
}
sort(all(queries,1));
int cur = 1;
for(int i = 1; i <= q; i++){
for(; cur < queries[i].l; cur++){
update(pre[cur], -1);
update(suff[cur], 2);
update(pre[suff[cur]], -1);
}
ans[queries[i].id] = query(queries[i].l, queries[i].r);
}
for(int i = 1; i <= q; i++){
cout << ans[i] << '\n';
}
return NAH_I_WOULD_WIN;
}
