/in/foo.cc: In function 'int main()':
/in/foo.cc:57:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(rg i=1;i<=col;i++)
  ^~~
/in/foo.cc:59:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(ans==1) printf("0\n");
   ^~
/in/foo.cc:51:6: warning: unused variable 'cnt' [-Wunused-variable]
  int cnt=0;
      ^~~