/in/foo.cc: In function 'bool rec(int, int)':
/in/foo.cc:40:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:44:41: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[1010]' [-Wformat=]
     for(int i=0;i<n;i++)scanf("%s",&a[i]);
                                         ^
/in/foo.cc:47:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
             if(a[i][j]=='#'&&vis[i][j]==0)
               ^