@[pengqiushi](/user/735164)
```cpp
#include <bits/stdc++.h>
using namespace std;
int a[35][35],n;
bool w[35][35];
void dfs(int x,int y)
{
if(w[x][y]==true||x>n+1||y>n+1||x<0||y<0)return ;
w[x][y]=true;
if(w[x+1][y]==false)dfs(x+1,y);
if(w[x-1][y]==false)dfs(x-1,y);
if(w[x][y+1]==false)dfs(x,y+1);
if(w[x][y-1]==false)dfs(x,y-1);
}
int main()
{
cin>>n;
for(int i=1; i<=n; i++)
{
for(int j=1; j<=n; j++)
{
cin>>a[i][j];
if(a[i][j]==1)w[i][j]=true;
}
}
dfs(0,0);
for(int i=1; i<=n; i++)
{
for(int j=1; j<=n; j++)
{
if(w[i][j]==false)cout<<2<<" ";
else cout<<a[i][j]<<" ";
}
cout<<endl;
}
return 0;
}
```
lz康康这个
希望能有所启发
by with_no_signal @ 2022-09-25 21:00:46
@[with_no_signal](/user/302803) 谢谢。
by pengqiushi @ 2022-09-25 21:10:31