Submission #310121

#	Time	Username	Problem	Language	Result	Execution time	Memory
310121		Temmie	Quality Of Living (IOI10_quality)	C++17	100 / 100	2017 ms	70956 KiB

quality

#include "quality.h"
#include <bits/stdc++.h>

bool f(int r, int c, int h, int w, int q[3001][3001], int mid) {
	int g[3001][3001];
	for (int i = 0; i <= r; i++)
		for (int j = 0; j <= c; j++)
			g[i][j] = 0;
	for (int i = 0; i < r; i++)
		for (int j = 0; j < c; j++)
			g[i + 1][j + 1] = g[i][j + 1] + g[i + 1][j] - g[i][j] + (q[i][j] <= mid);
	for (int i = h; i <= r; i++)
		for (int j = w; j <= c; j++)
			if (g[i][j] - g[i - h][j] - g[i][j - w] + g[i - h][j - w] > h * w / 2) return true;
	return false;
}

int rectangle(int r, int c, int h, int w, int q[3001][3001]) {
	int L = 0, R = r * c;
	while (R - L - 1) {
		int mid = (L + R) >> 1;
		if (f(r, c, h, w, q, mid)) R = mid;
		else L = mid;
	}
	return R;
}

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