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":"2020-07-30T06:45:42.230Z","handle":"2020-07-30T06:45:42.230Z","cache_start":"2020-07-30T06:45:42.247Z","read_cases":"2020-07-30T06:45:42.379Z","judge":"2020-07-30T06:45:42.383Z","done":"2020-07-30T06:45:43.071Z"}