```cpp
#include<bits/stdc++.h>
using namespace std;
const int N=510;
char g[N][N];
bool vis[N][N],flag;
int dx[4]={1,-1,0,0},dy[4]={0,0,1,-1},n,m,cnt;
bool check(int x,int y)
{
return x>=1&&x<=n&&y>=1&&y<=m &&g[x][y]!='*' &&!vis[x][y];
}
void dfs(int x,int y)
{
vis[x][y]=1;
for(int i=0;i<4;i++)
{
int nx=x+dx[i],ny=y+dy[i];
if(check(nx,ny))dfs(nx,ny);
}
}
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
cin>>g[i][j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if((i==1||i==n||j==1||j==m)&&!vis[i][j]&&g[i][j]=='0')
dfs(i,j);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(!vis[i][j]&&g[i][j]=='0')cnt++;
cout<<cnt;
return 0;
}
```
@[huangxinhao](/user/673638) 一种可行修改
by 杜都督 @ 2024-03-13 20:03:33
@[杜都督](/user/39279) 谢谢已过已关注
by huangxinhao @ 2024-03-17 15:16:33
此帖结
by huangxinhao @ 2024-03-17 15:17:43