foo.cc: In function 'int main()':
foo.cc:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&a,&b);
     ~~~~~^~~~~~~~~~~~~~~

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

{"receive":"2020-07-23T09:00:22.253Z","handle":"2020-07-23T09:00:22.253Z","cache_start":"2020-07-23T09:00:22.259Z","read_cases":"2020-07-23T09:00:22.400Z","judge":"2020-07-23T09:00:22.402Z","done":"2020-07-23T09:00:22.497Z"}