Submission #545242

#	Time	Username	Problem	Language	Result	Execution time	Memory
545242		AbdelmagedNour	Quality Of Living (IOI10_quality)	C++17	100 / 100	1702 ms	106080 KiB

quality

#include<bits/stdc++.h>
#include "quality.h"
//#include "grader.cpp"
int a[3001][3001],pre[3001][3001];
int n,m,x,y;
int sum(int x1,int x2,int y1,int y2){
    int sum1=pre[x2][y2];
    int sum2=(y1?pre[x2][y1-1]:0);
    int sum3=(x1?pre[x1-1][y2]:0);
    int sum4=(x1&&y1?pre[x1-1][y1-1]:0);
    return sum1-sum2-sum3+sum4;
}
bool f(int X){
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            pre[i][j]=(i?pre[i-1][j]:0)+(j?pre[i][j-1]:0)-(i&&j?pre[i-1][j-1]:0)+(a[i][j]<=X?1:-1);
        }
    }
    for(int i=x-1;i<n;i++){
        for(int j=y-1;j<m;j++){
            if(sum(i-x+1,i,j-y+1,j)>=1){
                return 1;
            }
        }
    }
    return 0;
}
int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
	n=R;m=C;x=H;y=W;
	for(int i=0;i<n;i++)for(int j=0;j<m;j++)a[i][j]=Q[i][j];
	int l=1,r=n*m,res=INT_MAX;
	while(l<=r){
        int md=(l+r)>>1;
        if(f(md))r=(res=md)-1;
        else l=md+1;
	}
	return res;
}

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