foo.cc: In function 'int main()':
foo.cc:5:10: 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":"2020-08-08T14:56:27.562Z","handle":"2020-08-08T14:56:27.562Z","cache_start":"2020-08-08T14:56:27.606Z","read_cases":"2020-08-08T14:56:27.712Z","judge":"2020-08-08T14:56:27.714Z","done":"2020-08-08T14:56:28.358Z"}