foo.cc: In function 'int main()':
foo.cc:6:10: error: expected ';' before numeric constant
  cout<<3 5 1 <<endl;
          ^
foo.cc:7:10: error: expected ';' before numeric constant
  cout<<4 2<<endl; 
          ^

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