Submission #1231895

#	Time	Username	Problem	Language	Result	Execution time	Memory
1231895		countless	삶의 질 (IOI10_quality)	C++20	100 / 100	1119 ms	70896 KiB

quality

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

typedef long long ll;
typedef long double ld;

#define sp <<" "<<
#define endl "\n"

const int MAXN = 3001;

int pref[MAXN][MAXN];

int rectangle(int R, int C, int H, int W, int Q[MAXN][MAXN]) {
	int lo = 0, hi = R*C;
	while (hi - lo > 1) {
		int mid = (lo+hi) / 2;
		for (int i = 1; i <= R; i++) {
			for (int j = 1; j <= C; j++) {
				pref[i][j] = Q[i-1][j-1] <= mid;
				pref[i][j] += pref[i-1][j] + pref[i][j-1] - pref[i-1][j-1];
			}
		}

		int mx = 0;
		for (int i = H; i <= R; i++) {
			for (int j = W; j <= C; j++) {
				mx = max(mx, pref[i][j] - pref[i - H][j] - pref[i][j - W] + pref[i - H][j - W]);
			}
		}

		if (mx >= (H*W+1)/2) {
			hi = mid;
		} else {
			lo = mid;
		}
	}

  // ok now it's tested
	return hi;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20