~~布灰~~
by 这有只蒟蒻呢_ @ 2021-06-05 15:20:16
```#include <iostream>
using namespace std;
int n,m,x1,y1,ans;
bool vis[25][25];
char c[25][25];
void dfs(int x,int y){
if(x < 1 || x > n || y < 1 || y > m) return;
if(vis[x][y]) return;
if(c[x][y] != 'X') return;
vis[x][y] = 1;
dfs(x + 1,y - 1);
dfs(x - 1,y + 1);
dfs(x,y + 1);
dfs(x,y - 1);
dfs(x + 1,y + 1);
dfs(x - 1,y);
dfs(x - 1,y - 1);
dfs(x + 1,y);
}
int main(){
cin >> n >> m >> x1 >> y1;
for(int i = 1;i <= n;i++)
for(int j = 1;j <= m;j++)
cin >> c[i][j];
dfs(x1,y1);
for(int i = 1;i <= n;i++){
for(int j = 1;j <= m;j++){
if(vis[i][j]){
ans += 4;
if(vis[i - 1][j]) ans--;
if(vis[i + 1][j]) ans--;
if(vis[i][j + 1]) ans--;
if(vis[i][j - 1]) ans--;
}
}
}
cout << ans;
return 0;
}
by LYM20114 @ 2022-06-14 14:03:06