Submission #998734

#	Time	Username	Problem	Language	Result	Execution time	Memory
998734		ZeroCool	Quality Of Living (IOI10_quality)	C++14	0 / 100	1 ms	6492 KiB

quality

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

#define ar array
#define ll long long

int n, m, h, w;

const int N = 3005;

int A[N][N];
int B[N][N];

int query(int x1, int y1, int x2, int y2){
	int res = B[x2][y2];
	if(x1)res -= B[x1-1][y2];
	if(y1)res -= B[x2][y1-1];
	if(x1 && y1)res += B[x1-1][y1-1];
	return res;
}

bool check(int k){
	for(int i = 0;i<n;i++){
		for(int j = 0;j<m;j++){
			B[i][j] = (A[i][j] <= k);
		}
	}
	
	for(int i = 1;i<n;i++){
		for(int j = 1;j<m;j++){
			B[i][j] += B[i-1][j];
			B[i][j] += B[i][j-1];
			B[i][j] -= B[i-1][j-1];
		}
	}
	
	
	for(int i = 0;i + h - 1 < n;i++){
		for(int j = 0;j + w - 1 < m;j++){
			if(query(i, j, i + h - 1, j + w - 1) >= (w * h) / 2 + 1)return 1;
			
		}
	}
	return 0;
}

int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
	n = R;
	m = C;
	h = H;
	w = W;
	for(int i = 0;i<n;i++){
		for(int j = 0;j<m;j++){
			A[i][j] = Q[i][j];
		}
	}
	
	int lo = 1;
	int hi = n * m;
	int ans = -1;
	while(lo <= hi){
		int mid = (lo + hi) / 2;
		if(check(mid)){
			ans = mid;
			hi = mid - 1;
		}else lo = mid + 1;
	}
	return ans;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20