#include <bits/stdc++.h>
typedef long long ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)
using namespace std;
int pos[9000001][2];
int pref[3001][3001];
int r,c,h,w;
bool check(int x){
FOR(i,0,3001){
FOR(j,0,3001){
pref[i][j] = 0;
}
}
FOR(i,1,x+1){
int a = pos[i][0]; int b=pos[i][1];
FORNEG(j,a,max(-1, a-h)){
pref[j][b+1] -= 1;
}
b = max(0, b-(w-1));
FORNEG(j,a,max(-1, a-h)){
pref[j][b] += 1;
}
}
FOR(i,0,r-h+1){
if (pref[i][0] > int(h*w/2)) return true;
FOR(j,1,c-w+1){
pref[i][j] += pref[i][j-1];
if (pref[i][j]> int(h*w/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(i,0,R){
FOR(j,0,C){
pos[Q[i][j]][0] = i;
pos[Q[i][j]][1] = j;
}
}
int lo = 0;
int hi = int(R*C/2)+1;
while (lo < hi) {
int mid = lo + (hi - lo) / 2;
if (check(mid)) {
hi = mid;
} else {
lo = mid + 1;
}
}
return lo;
}
int Q[3001][3001];
int main(){
cin.tie(0)->sync_with_stdio(0);
freopen("input.txt", "r", stdin);
int R,C,H,W;
cin >> R >> C >> H >> W;
r = R; c = C; h = H; w = W;
FOR(i,0,R){
FOR(j,0,C){
cin >> Q[i][j];
}
}
FOR(i,0,R){
FOR(j,0,C){
pos[Q[i][j]][0] = i;
pos[Q[i][j]][1] = j;
}
}
//cout << rectangle(R,C,H,W,Q);
}
Compilation message
quality.cpp: In function 'int main()':
quality.cpp:66:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
66 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccpWXq8L.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccJUVsGL.o:quality.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
