foo.cc: In function 'int main()':
foo.cc:5:6: error: expected ';' before '{' token
  cout{
      ^
foo.cc:15:3: warning: statement has no effect [-Wunused-value]
   }
   ^

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