foo.cc: In function 'int main()':
foo.cc:10:9: warning: unused variable 't' [-Wunused-variable]
     int t=0;
         ^
foo.cc:12:9: warning: unused variable 'T' [-Wunused-variable]
     int T = 3;
         ^

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