Submission #925495

#	Time	Username	Problem	Language	Result	Execution time	Memory
925495		VMaksimoski008	Quality Of Living (IOI10_quality)	C++14	Compilation error	0 ms	0 KiB

quality

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

int pref[3005][3005];

int rectangle(int n, int m, int r, int c, int q[3005][3005]) {
    int l=0, r=1e9;
    int ans = 0;

    int mat[n+1][m+1];
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++) mat[i][j] = q[i-1][j-1];

    while(l <= r) {
        int mid = (l + r) / 2;
        bool ok = 0;

        for(int i=1; i<=n; i++)
            for(int j=1; j<=m; j++)
                pref[i][j] = (mat[i][j] >= mid) + pref[i][j-1] + pref[i-1][j] - pref[i-1][j-1];

        for(int i=1; i+r-1<=n; i++) {
            if(ok) break;
            for(int j=1; j+c-1<=m; j++) {
                if(ok) break;
                ll res = pref[i+r-1][j+c-1] - pref[i-1][j+c-1] - pref[i+r-1][j-1] + pref[i-1][j-1];
                if(2 * res >= r * c) ok = 1;
            }
        }

        if(ok) ans = mid, l = mid + 1;
        else r = mid - 1;
    }

    return ans;
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3005])':
quality.cpp:9:14: error: declaration of 'int r' shadows a parameter
    9 |     int l=0, r=1e9;
      |              ^
quality.cpp:8:33: note: 'int r' previously declared here
    8 | int rectangle(int n, int m, int r, int c, int q[3005][3005]) {
      |                             ~~~~^