Submission #987642

#	Time	Username	Problem	Language	Result	Execution time	Memory
987642		tamthegod	Poklon (COCI17_poklon)	C++17	98 / 140	240 ms	13516 KiB

poklon

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll maxn = 2e5 + 5, maxsz = 1e6 + 5, b = 500;
ll n, q, a[maxn], res = 0;
ll cnt[maxsz], ans[maxn];
struct Query
{
    ll l, r, id;
} qu[maxn];
void add(ll x) {
    res -= (cnt[x] == 2);
    cnt[x]++;
    res += (cnt[x] == 2);
}
void del(ll x) {
    res -= (cnt[x] == 2);
    cnt[x]--;
    res += (cnt[x] == 2);
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> q;
    for (ll i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (ll i = 1; i <= q; i++) {
        cin >> qu[i].l >> qu[i].r;
        qu[i].id = i;
    }
    sort(qu + 1, qu + q + 1, [](Query p, Query q) {
        ll x = ((p.l - 1) / b + 1), y = (q.l - 1) / b + 1;
        return (x < y || (x == y && p.r < q.r));
    });
    ll l = 1, r = 0;
    for (ll i = 1; i <= q; i++) {
        while(l < qu[i].l) {
            del(a[l]);
            l++;
        }
        while(l > qu[i].l) {
            l--;
            add(a[l]);
        }
        while(r < qu[i].r) {
            r++;
            add(a[r]);
        }
        while(r > qu[i].r) {
            del(a[r]);
            r--;
        }
        ans[qu[i].id] = res;
    }
    for (ll i = 1; i <= q; i++) {
        cout << ans[i] << '\n';
    }
}

• Subtask 1: 98 / 140