/in/foo.cc: In function 'int main()':
/in/foo.cc:18:1: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
 else  printf("%.6lf",ans);
 ^~~~
/in/foo.cc:19:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
  return 0;
  ^~~~~~