foo.cc:1:2: error: 'cin' does not name a type
  cin>>x;
  ^~~
foo.cc:2:6: error: expected constructor, destructor, or type conversion before '(' token
  fblq(x);
      ^
foo.cc:3:2: error: expected unqualified-id before 'return'
  return 0;
  ^~~~~~
foo.cc:4:1: error: expected declaration before '}' token
 }
 ^

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。