Submission #519503

#	Time	Username	Problem	Language	Result	Execution time	Memory
519503		fabijan_cikac	Quality Of Living (IOI10_quality)	C++17	100 / 100	2121 ms	101456 KiB

quality

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 3001;

int pref[MAXN][MAXN];
bool check(int x, int n, int m, int h, int w, int a[MAXN][MAXN]){
    int px, py;
    for (int i = 0; i <= max(n, m); ++i){
        pref[0][i] = 0; pref[i][0] = 0;
    }
    for (int i = 1; i <= n; ++i){
        for (int j = 1; j <= m; ++j){
            pref[i][j] = pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1];
            if (a[i - 1][j - 1] < x)
                --pref[i][j];
            else if (a[i - 1][j - 1] > x)
                ++pref[i][j];
            else{
                px = i; py = j;
            }
         }
    }
    for (int i = 1; i <= n - h + 1; ++i){
        for (int j = 1; j <= m - w + 1; ++j){
            if ((pref[i + h - 1][j + w - 1] - pref[i - 1][j + w - 1] - pref[i + h - 1][j - 1] + pref[i - 1][j - 1] == 0 && (px >= i && px <= i + h - 1 && py >= j && py <= j + w - 1)) || pref[i + h - 1][j + w - 1] - pref[i - 1][j + w - 1] - pref[i + h - 1][j - 1] + pref[i - 1][j - 1] < 0)
                return 1;
        }
    }
    return 0;
}

int bins(int l, int r, int n, int m, int h, int w, int a[MAXN][MAXN]){
    int mid = (l + r - 1) / 2;
    if (l == r)
        return l;
    else if (check(mid, n, m, h, w, a))
        return bins(l, mid, n, m, h, w, a);
    return bins(mid + 1, r, n, m, h, w, a);
}

int rectangle(int R, int C, int H, int W, int Q[MAXN][MAXN]){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    return bins(1, R * C, R, C, H, W, Q);
}

Compilation message (stderr)

quality.cpp: In function 'bool check(int, int, int, int, int, int (*)[3001])':
quality.cpp:27:163: warning: 'py' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |             if ((pref[i + h - 1][j + w - 1] - pref[i - 1][j + w - 1] - pref[i + h - 1][j - 1] + pref[i - 1][j - 1] == 0 && (px >= i && px <= i + h - 1 && py >= j && py <= j + w - 1)) || pref[i + h - 1][j + w - 1] - pref[i - 1][j + w - 1] - pref[i + h - 1][j - 1] + pref[i - 1][j - 1] < 0)
      |                                                                                                                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
quality.cpp:27:121: warning: 'px' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |             if ((pref[i + h - 1][j + w - 1] - pref[i - 1][j + w - 1] - pref[i + h - 1][j - 1] + pref[i - 1][j - 1] == 0 && (px >= i && px <= i + h - 1 && py >= j && py <= j + w - 1)) || pref[i + h - 1][j + w - 1] - pref[i - 1][j + w - 1] - pref[i + h - 1][j - 1] + pref[i - 1][j - 1] < 0)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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