#include "quality.h"
#include <bits/stdc++.h>
using namespace std;
int R, C, H, W;
int Q[3001][3001];
bool check(int k) {
vector< vector<int> > pre(R + 1, vector<int>(C + 1, 0));
for (int i = 0; i < R; i++) for (int j = 0; j < C; j++) if (Q[i][j] <= k) pre[i + 1][j + 1] = 1;
for (int i = 1; i <= R; i++) for (int j = 1; j <= C; j++) pre[i][j] += pre[i - 1][j] + pre[i][j - 1] - pre[i - 1][j - 1];
for (int i = H; i <= R; i++) {
for (int j = W; j <= C; j++) {
if (pre[i][j] - pre[i - H][j] - pre[i][j - W] + pre[i - H][j - W] >= (H * W + 1) / 2) return true;
}
}
return false;
}
int rectangle(int _R, int _C, int _H, int _W, int _Q[3001][3001]) {
R = _R, C = _C, H = _H, W = _W;
for (int i = 0; i < R; i++) for (int j = 0; j < C; j++) Q[i][j] = _Q[i][j];
int lo = 1, hi = R * C;
while (lo < hi) {
//cerr << lo << endl;
int mid = (lo + hi) / 2;
if (check(mid)) hi = mid;
else lo = mid + 1;
}
return lo;
}
