Submission #734890

#	Time	Username	Problem	Language	Result	Execution time	Memory
734890		phoebe	Quality Of Living (IOI10_quality)	C++17	100 / 100	1761 ms	122328 KiB

quality

#include <bits/stdc++.h>
#include "quality.h"
using namespace std;

int prefix[3001][3001] = {0};

int rectangle(int R, int C, int H, int W, int Q[3001][3001]){
    int l = 0, r = 3001 * 3001, ans;
    while (l <= r){
        int mid = (l + r) / 2;
        for (int i = 1; i <= R; i++){
            for (int j = 1; j <= C; j++){
                if (Q[i - 1][j - 1] <= mid) prefix[i][j] = 1;
                else prefix[i][j] = -1;
                prefix[i][j] += prefix[i][j - 1];
            }
        }
        for (int i = 1; i <= R; i++){
            for (int j = 1; j <= C; j++) 
                prefix[i][j] += prefix[i - 1][j];
        }
        bool pos = false;
        for (int i = H; i <= R; i++){
            for (int j = W; j <= C; j++){
                int val = prefix[i][j] - prefix[i - H][j] 
                - prefix[i][j - W] + prefix[i - H][j - W];
                if (val > 0) pos = true;
            }
        }
        if (pos) ans = mid, r = mid - 1;
        else l = mid + 1;
    }
    return ans;
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:33:12: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   33 |     return ans;
      |            ^~~

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