#include "quality.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(v) v.begin(),v.end()
int rectangle(int n, int m, int h, int w, int a[3001][3001]) {
auto check = [&](int x) {
vector<vector<int>> g(n, vector<int>(m, 0));
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
g[i][j] = a[i][j] <= x ? 1 : -1;
if(i != 0) g[i][j] += g[i-1][j];
if(j != 0) g[i][j] += g[i][j-1];
if(i != 0 && j != 0) g[i][j] -= g[i-1][j-1];
}
}
auto sum = [&](int x1, int y1, int x2, int y2) {
int sum = g[x2][y2];
if(x1 != 0) sum -= g[x1 - 1][y2];
if(y1 != 0) sum -= g[x2][y1 - 1];
if(x1 != 0 && y1 != 0) sum += g[x1 - 1][y1 - 1];
return sum;
};
int mx = -h*w;
for(int x1 = 0, x2 = h-1; x2 < n; x1++, x2++) {
for(int y1 = 0, y2 = w-1; y2 < m; y1++, y2++) {
int s = sum(x1, y1, x2, y2);
mx = max(mx, s);
}
}
return mx > 0;
};
int ans = 0;
int l = 1, r = n*m;
while(l < r) {
int mid = (l+r)/2;
if (check(mid)) r = mid;
else l = mid + 1;
}
return l;
}
