foo.cc:6:10: error: stray '\357' in program
  return 0；
          ^
foo.cc:6:11: error: stray '\274' in program
  return 0；
           ^
foo.cc:6:12: error: stray '\233' in program
  return 0；
            ^
foo.cc: In function 'int main()':
foo.cc:5:17: error: expected primary-expression before ';' token
  cout<<"ha on"<<;
                 ^
foo.cc:7:1: error: expected ';' before '}' token
 }
 ^

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