#include "quality.h"
#include <vector>
#include <set>
using namespace std;
int rectangle(int n, int m, int h, int w, int q[3001][3001]) {
//const int n = R, m = C, h = H, w = W;
const int MAX = 9000012, MAX_INT = 2000000024;
int i, j, k, l;
int t = (h*w)/2, min_ = MAX_INT, c;
set<int> arr;
for(i = 0; i <= n - h; i++) {
arr.clear();
for(k = i; k < i + h; k++) {
for(l = 0; l < w; l++) {
arr.insert(q[k][l]);
}
}
c = *next(arr.begin(), t);
if(c < min_) min_ = c;
for(j = 0; j < m - w; j++) {
for(k = i; k < i + w; k++) {
auto it = lower_bound(arr.begin(), arr.end(), q[k][j]);
arr.erase(it);
arr.insert(q[k][j+w]);
}
c = *next(arr.begin(), t);
if(c < min_) min_ = c;
}
}
return min_;
}
