foo.cc: In function 'int main()':
foo.cc:7:6: warning: variable 's' set but not used [-Wunused-but-set-variable]
  int s;
      ^

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

{"receive":"2020-07-23T14:53:07.315Z","handle":"2020-07-23T14:53:07.315Z","cache_start":"2020-07-23T14:53:07.321Z","read_cases":"2020-07-23T14:53:07.431Z","judge":"2020-07-23T14:53:07.432Z","done":"2020-07-23T14:53:07.910Z"}