제출 #730680

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
730680		vjudge1	Izbori (COCI22_izbori)	C++17	40 / 110	3050 ms	10048 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define ll long long

const int NM = 2e5, SZ = 450;

int n, a[NM+5], cnt[NM+5];
bool type[NM+5];
vector <int> v;
ll ans = 0;
int pref[NM+5];
int st[8*NM+5];

void compress(){
	for (int i = 1; i <= n; i++)
		v.push_back(a[i]);
	sort(v.begin(), v.end());
	for (int i = 1; i <= n; i++)
		a[i] = lower_bound(v.begin(), v.end(), a[i])-v.begin();
}

void solve1(){
	memset(cnt, 0, sizeof(cnt));
	for (int i = 1; i <= n; i++){
		int best = -1;
		for (int j = i; j < min(i+2*SZ, n+1); j++){
			if (type[a[j]] == 0) cnt[a[j]]++;
			if (best == -1 || cnt[a[j]] > cnt[best]) best = a[j];
			if (cnt[best]*2 > j-i+1){
				ans++;
			}
		}
		for (int j = i; j < min(i+2*SZ, n+1); j++)
			if (type[a[j]] == 0) cnt[a[j]]--;
	}
}

void update(int id, int l, int r, int i){
	if (i < l || i > r) return;
	if (l == r){
		st[id]++;
		return;
	}
	int mid = (l+r)/2;
	update(2*id, l, mid, i);
	update(2*id+1, mid+1, r, i);
	st[id] = st[2*id]+st[2*id+1];
}

int get(int id, int l, int r, int u, int v){
	if (u > v || v < l || u > r) return 0;
	if (l >= u && r <= v) return st[id];
	int mid = (l+r)/2;
	return get(2*id, l, mid, u, v)+get(2*id+1, mid+1, r, u, v);
}

void solve2(int s){
	pref[0] = 0;
	for (int i = 1; i <= n; i++){
		pref[i] = pref[i-1];
		if (a[i] == s) pref[i]++;
	}
	memset(st, 0, sizeof(st));
	update(1, 0, 2*n, n);
	for (int i = 1; i <= n; i++){
		ans += get(1, 0, 2*n, 0, 2*pref[i]-i-1+n);
		update(1, 0, 2*n, 2*pref[i]-i+n);
	}
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	compress();
	for (int i = 1; i <= n; i++)
		cnt[a[i]]++;
	for (int i = 0; i < n; i++)
		if (cnt[i] > SZ) type[i] = 1;
	solve1();
	for (int i = 0; i < n; i++)
		if (type[i]) solve2(i);
	cout << ans;
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 0 / 70