Submission #388747

#	Time	Username	Problem	Language	Result	Execution time	Memory
388747		Pichon5	Quality Of Living (IOI10_quality)	C++17	100 / 100	2450 ms	140244 KiB

quality

#include "quality.h"
#include <bits/stdc++.h>
#define vi vector<vi>
#define ll long long int
#define pb push_back
using namespace std;
int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
    //R rows
    //C columns
    // H de hight
    //W de weihght

    int M[3001][3001];
    int b=1,e=C*R;
    int res;
    while(b<=e){
        int i=(b+e)/2;
        for(int j=0;j<R;j++){
            for(int k=0;k<C;k++){
                M[j][k]=0;
                if(Q[j][k]>i)M[j][k]=1;
                if(Q[j][k]<i)M[j][k]=-1;
            }
        }
        for(int j=0;j<R;j++){
            for(int k=0;k<C;k++){
                if(j)M[j][k]+=M[j-1][k];
                if(k)M[j][k]+=M[j][k-1];
                if(j>0 && k>0)M[j][k]-=M[j-1][k-1];
            }
        }
        bool ok=false;
        for(int j=0;j+H<=R;j++){
            for(int k=0;k+W<=C;k++){
                int sum=M[j+H-1][k+W-1];
                if(j)sum-=M[j-1][k+W-1];
                if(k)sum-=M[j+H-1][k-1];
                if(j>0 && k>0)sum+=M[j-1][k-1];
                if(sum<=0)ok=1;
            }
        }
        if(ok){
            res=i;
            e=i-1;
        }else{
            b=i+1;
        }
    }
    return res;
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:49:12: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |     return res;
      |            ^~~

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