#include <bits/stdc++.h>
#define DIM 3010
using namespace std;
int n,m,h,w,i,j,k,a[DIM][DIM],sp[DIM][DIM],sp2[DIM][DIM],v[DIM*DIM];
int verif (int n, int m, int h, int w, int a[DIM][DIM], int val){
for (int i=1;i<=n;i++)
for (int j=1;j<=m;j++)
sp[i][j] = sp2[i][j] = 0;
for (int i=1;i<=n;i++)
for (int j=1;j<=m;j++){
sp[i][j] = sp[i-1][j] + sp[i][j-1] - sp[i-1][j-1];
sp2[i][j] = sp2[i-1][j] + sp2[i][j-1] - sp2[i-1][j-1];
if (a[i-1][j-1] < val)
sp[i][j]++;
if (a[i-1][j-1] == val)
sp2[i][j]++;
}
for (i=1;i<=n-h+1;i++)
for (j=1;j<=m-w+1;j++){
int sum = sp2[i+h-1][j+w-1] - sp2[i+h-1][j-1] - sp2[i-1][j+w-1] + sp2[i-1][j-1];
if (!sum)
continue;
sum = sp[i+h-1][j+w-1] - sp[i+h-1][j-1] - sp[i-1][j+w-1] + sp[i-1][j-1];
if (sum >= h*w / 2)
return 1;
}
return 0;
}
int rectangle (int n, int m, int h, int w, int a[DIM][DIM]){
for (int i=0;i<n;i++)
for (int j=0;j<m;j++)
v[++k] = a[i][j];
sort (v+1,v+k+1);
int st = 1, dr = n*m, sol;
while (st <= dr){
int mid = (st+dr)>>1;
if (verif(n,m,h,w,a,v[mid])){
sol = v[mid];
dr = mid-1;
} else st = mid+1;
}
return sol;
}
Compilation message
quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3010])':
quality.cpp:54:12: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized]
return sol;
^~~
/tmp/cchi8Qpa.o: In function `main':
grader.cpp:(.text.startup+0xcd): undefined reference to `rectangle(int, int, int, int, int (*) [3001])'
collect2: error: ld returned 1 exit status
