oj.uz

답안 #730673

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
730673 2023-04-26T09:06:13 Z vjudge1 Izbori (COCI22_izbori) C++17
25 / 110
 8 ms 3924 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long

const int NM = 1e5, SZ = 320;

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 (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
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 724 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 3 ms 756 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 8 ms 772 KB Output is correct
10 Correct 8 ms 772 KB Output is correct
11 Correct 8 ms 724 KB Output is correct
12 Correct 8 ms 724 KB Output is correct
13 Correct 8 ms 776 KB Output is correct
14 Correct 8 ms 724 KB Output is correct
15 Correct 8 ms 736 KB Output is correct
16 Correct 8 ms 724 KB Output is correct
17 Correct 5 ms 3924 KB Output is correct

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 1028 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 724 KB Output is correct
7 Correct 3 ms 756 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 8 ms 772 KB Output is correct
10 Correct 8 ms 772 KB Output is correct
11 Correct 8 ms 724 KB Output is correct
12 Correct 8 ms 724 KB Output is correct
13 Correct 8 ms 776 KB Output is correct
14 Correct 8 ms 724 KB Output is correct
15 Correct 8 ms 736 KB Output is correct
16 Correct 8 ms 724 KB Output is correct
17 Correct 5 ms 3924 KB Output is correct
18 Incorrect 5 ms 1028 KB Output isn't correct
19 Halted 0 ms 0 KB -