Submission #1085032

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085032		Sunbae	Quality Of Living (IOI10_quality)	C++17	Compilation error	0 ms	0 KiB

quality

#include <bits/stdc++.h>
#define z exit(0)
using namespace std;
const int N = 3005;
int qs[N][N], a[N][N];
bool V(int i, int j, int m, int n){ return i>=0 && j>=0 && i<m && j<n;}
int f(int i, int j, int m, int n){ return V(i, j, m, n) ? qs[i][j] : 0;}
int rectangle(int m, int n, int kx, int ky, int a[][N]){
	int low = 0, high = 1e9, ans;
	while(low <= high){
		int mid = low + ((high-low)>>1);
		for(int i = 0; i<m; ++i) for(int j = 0; j<n; ++j) qs[i][j] = f(i-1, j, m, n) + f(i, j-1, m, n) + (a[i][j] <= mid) - f(i-1, j-1, m, n);
		bool ch = false;
		for(int i = kx-1; i<m; ++i){
			for(int j = ky-1; j<n; ++j) if(qs[i][j] - f(i-kx, j, m, n) - f(i, j-ky, m, n) + f(i-kx, j-ky, m, n) > (kx*ky-1)/2){ch = true; break;}
			if(ch) break;
		}
		if(ch) high = mid-1, ans = mid;
		else low = mid+1;
	}
	return ans;
}
/*
signed main(){
	int m, n, kx, ky; scanf("%d %d %d %d", &m, &n, &kx, &ky);
	for(int i = 0; i<m; ++i){
		for(int j = 0; j<n; ++j) scanf("%d", &a[i][j]);
	}
	printf("%d", rectangle(m, n, kx, ky, a));
}
*/

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3005])':
quality.cpp:21:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   21 |  return ans;
      |         ^~~
/usr/bin/ld: /tmp/ccJva3ji.o: in function `main':
grader.cpp:(.text.startup+0xe9): undefined reference to `rectangle(int, int, int, int, int (*) [3001])'
collect2: error: ld returned 1 exit status