foo.cc: In function 'int main()':
foo.cc:30:7: warning: unused variable 'ok' [-Wunused-variable]
   int ok=0;
       ^~

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

{"receive":"2020-08-10T03:33:49.823Z","handle":"2020-08-10T03:33:49.823Z","cache_start":"2020-08-10T03:33:49.832Z","read_cases":"2020-08-10T03:33:49.950Z","judge":"2020-08-10T03:33:49.953Z","done":"2020-08-10T03:33:50.285Z"}