Submission #512652

#	Time	Username	Problem	Language	Result	Execution time	Memory
512652		algorithm16	Quality Of Living (IOI10_quality)	C++14	100 / 100	1515 ms	89364 KiB

quality

#include "quality.h"
int sum[3005][3005];
int get_sum(int x1,int y1,int x2,int y2) {
	int ret=sum[x2][y2];
	if(x1) ret-=sum[x1-1][y2];
	if(y1) ret-=sum[x2][y1-1];
	if(x1 && y1) ret+=sum[x1-1][y1-1];
	return ret;
}
int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
	int r=R,c=C,h=H,w=W;
	int lo=1,hi=r*c;
	while(lo<hi) {
		int mid=(lo+hi)/2;
		int s=0,cnt=0;
		for(int i=0;i<r;i++) {
			s=0;
			for(int j=0;j<c;j++) {
				if(Q[i][j]<=mid) s+=1;
				else s-=1;
				sum[i][j]=s;
				if(i) sum[i][j]+=sum[i-1][j];
			}
		}
		for(int i=0;i+h-1<r;i++) {
			for(int j=0;j+w-1<c;j++) {
				if(get_sum(i,j,i+h-1,j+w-1)>0) cnt+=1;
			}
		}
		if(cnt) hi=mid;
		else lo=mid+1;
	}
	return lo;
}

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