This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include "quality.h"
using namespace std;
#define ll long long
//#define int ll
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int x[3001][3001];
bool c(int k,int R,int C,int H,int W,int Q[3001][3001]){
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
x[i][j]=0;
}
}
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
x[i][j]=Q[i][j]<k;
if(j>0)x[i][j]+=x[i][j-1];
}
}
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
if(i>0)x[i][j]+=x[i-1][j];
}
}
for(int i=H-1;i<R;i++){
for(int j=W-1;j<C;j++){
int z=x[i][j];
if(i>H-1)z-=x[i-H][j];
if(j>W-1)z-=x[i][j-W];
if(i>=H && j>=W)z+=x[i-H][j-W];
if(z>=(H*W/2)){
return 1;
}
}
}
return 0;
}
int sol(int k,int R,int C,int H,int W,int Q[3001][3001]){
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
x[i][j]=0;
}
}
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
x[i][j]=Q[i][j]<k;
if(j>0)x[i][j]+=x[i][j-1];
}
}
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
if(i>0)x[i][j]+=x[i-1][j];
}
}
int mi=1000000000;
for(int i=H-1;i<R;i++){
for(int j=W-1;j<C;j++){
int z=x[i][j];
if(i>H-1)z-=x[i-H][j];
if(j>W-1)z-=x[i][j-W];
if(i>=H && j>=W)z+=x[i-H][j-W];
if(z>=(H*W/2)){
for(int a=i-H+1;a<=i;a++){
for(int b=j-W+1;b<=j;b++){
if(Q[a][b]>=k)mi=min(mi,Q[a][b]);
}
}
}
}
}
return mi;
}
int rectangle(int R,int C,int H,int W,int Q[3001][3001]) {
int l=1,r=R*C+1;
while(l<r-1){
int m=(l+r)/2;
if(c(m,R,C,H,W,Q))r=m;
else l=m;
}
return sol(r,R,C,H,W,Q);
}/*
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);
int R,C,H,W;
cin>>R>>C>>H>>W;
int Q[3001][3001];
for(int i=0;i<R;i++){
for(int j=0;j<C;j++){
cin>>Q[i][j];
}
}
cout<<rectangle(R,C,H,W,Q);
}*/
/*
5 5 3 3
5 11 12 16 25
17 18 2 7 10
4 23 20 3 1
24 21 19 14 9
6 22 8 13 15
*/
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