Wrong Answer
foo.cc: In function 'int main()':
foo.cc:19:7: warning: unused variable 'a' [-Wunused-variable]
int a, b;
^
foo.cc:19:10: warning: unused variable 'b' [-Wunused-variable]
int a, b;
^
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。