foo.cc: In function 'int main()':
foo.cc:7:6: warning: variable 's' set but not used [-Wunused-but-set-variable]
  int s=0;
      ^

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

{"receive":"2020-07-23T14:56:45.447Z","handle":"2020-07-23T14:56:45.447Z","cache_start":"2020-07-23T14:56:45.453Z","read_cases":"2020-07-23T14:56:45.583Z","judge":"2020-07-23T14:56:45.583Z","done":"2020-07-23T14:56:46.121Z"}