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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5. #define F first
  6. #define S second
  7. #define ii pair < int , int >
  8. #define ever (;;)
  9.  
  10. const int N = 1010;
  11.  
  12. bool vis[N][N];
  13. int n,m,movex[4]={1,-1,0,0},movey[4]={0,0,1,-1};
  14. char a[N][N];
  15.  
  16. void dfs(int x,int y)
  17. {
  18.     vis[x][y] = 1;
  19.  
  20.     for(int i=0;i<4;i++)
  21.     {
  22.         int newx = x + movex[i];
  23.         int newy = y + movey[i];
  24.  
  25.         if( !vis[newx][newy] && a[newx][newy] == '.' )
  26.             dfs(newx,newy);
  27.     }
  28. }
  29.  
  30. int main()
  31. {
  32.     cin>>n>>m;
  33.     for(int i=1;i<=n;i++)
  34.         for(int j=1;j<=m;j++)
  35.             cin>>a[i][j];
  36.  
  37.     for(int i=1;i<=n;i++)
  38.         for(int j=1;j<=m;j++)
  39.             if( !vis[i][j] && a[i][j] == '.' )
  40.                 dfs(i,j);
  41. }
  42.  
Success #stdin #stdout 0s 4280KB
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https://ideone.com/w8Uszb
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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