Submission #906131

#	Time	Username	Problem	Language	Result	Execution time	Memory
906131		JakobZorz	Quality Of Living (IOI10_quality)	C++17	100 / 100	1355 ms	140144 KiB

quality

#include"quality.h"
#include<iostream>
#include<vector>
using namespace std;

int w2,h2,w,h;
int mat[3000][3000];

bool check(int val){
    vector<int>cols(w2);
    
    int cube=0;
    
    for(int y=0;y<=h2-h;y++){
        if(y==0){
            for(int x2=0;x2<w-1;x2++)
                for(int y2=0;y2<h;y2++)
                    cube+=(mat[x2][y2]<=val);
            
            for(int x=0;x<w2;x++)
                for(int y2=0;y2<h;y2++)
                    cols[x]+=(mat[x][y2]<=val);
        }else{
            for(int x2=0;x2<w-1;x2++){
                cube-=(mat[x2][y-1]<=val);
                cube+=(mat[x2][y+h-1]<=val);
            }
            
            for(int x=0;x<w2;x++){
                cols[x]-=(mat[x][y-1]<=val);
                cols[x]+=(mat[x][y+h-1]<=val);
            }
        }
        
        int low=cube;
        
        for(int x=0;x<=w2-w;x++){
            if(x)
                low-=cols[x-1];
            low+=cols[x+w-1];
            if(low>=(w*h+1)/2){
                return true;
            }
        }
    }
    return false;
}

int rectangle(int R,int C,int H,int W,int Q[3001][3001]){
    w2=R;
    h2=C;
    w=H;
    h=W;
    for(int x=0;x<w2;x++)
        for(int y=0;y<h2;y++)
            mat[x][y]=Q[x][y];
            
    int bl=0,br=w2*h2;
    while(bl<br-1){
        int mid=(bl+br)/2;
        if(check(mid))
            br=mid;
        else
            bl=mid;
    }
    
	return br;
}

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