foo.cc: In function ‘int main()’:
foo.cc:20:9: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
   20 |         for(int i=1;i<=r;i++)
      |         ^~~
foo.cc:23:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
   23 |                 q.push(node(1,1,1));
      |                 ^
foo.cc:38:33: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
   38 |                                 if(nx>=1&&nx<=r&&ny>=1&&ny<=c&&ch[nx][ny]=='.')
      |                                 ^~
foo.cc:40:41: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
   40 |                                         ch[nx][ny]='#';
      |                                         ^~