考虑这组数据：
```
3 3
1 1 0
1 1 1
0 1 1
```
by _Lyk_def @ 2023-06-10 22:36:40
@[chenhaofeng](/user/664921)
```cpp
#include<bits/stdc++.h>
using namespace std;
long long int n,m,a,f[1005][1005],ans;
bool flag[1005][1005];
int main(){
cin>>n>>m;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
cin>>a;
if(a==0){
flag[i][j]=true;
}
}
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(!flag[i][j]){
f[i][j]=min(f[i-1][j-1],min(f[i-1][j],f[i][j-1]))+1;
ans=max(ans,f[i][j]);
}
}
}
cout<<ans;
return 0;
}
```
by zhouzihe @ 2023-06-10 22:42:14
@[_Lyk_def](/user/769863) 谢谢
by liang_bs @ 2023-06-11 15:06:32
@[zhouzihe](/user/798537) 谢谢
by liang_bs @ 2023-06-11 15:06:52