Submission #1009159

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009159		Muaath_5	Quality Of Living (IOI10_quality)	C++17	100 / 100	1157 ms	140332 KiB

quality

#include "quality.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 3003;
int pref[N][N];
int query(int x1, int y1, int x2, int y2) {
    return pref[x2][y2] - pref[x2][y1-1] - pref[x1-1][y2] + pref[x1-1][y1-1];
}
int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
    int l = 1, r = R*C;
    while (l < r) {
        const int mid = (l+r)/2;
        for (int i = 1; i <= R; i++) {
            for (int j = 1; j <= C; j++) {
                pref[i][j] = (Q[i-1][j-1] <= mid ? 1 : 0);
                pref[i][j] += pref[i][j-1];
            }
        }
        for (int i = 1; i <= R; i++) {
            for (int j = 1; j <= C; j++) {
                pref[i][j] += pref[i-1][j];
            }
        }
        int sum = 0;
        bool ok = false;
        for (int i = 1; i <= R-H+1; i++) {
            for (int j = 1; j <= C-W+1; j++) {
                if (query(i, j, i+H-1, j+W-1) >= H*W/2 + (H*W%2)) {
                    ok = true;
                }
            }
        }
        if (ok)
            r = mid;
        else
            l = mid+1;
    }
    return l;
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:24:13: warning: unused variable 'sum' [-Wunused-variable]
   24 |         int sum = 0;
      |             ^~~

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