foo.cc: In function 'int main()':
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~

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

{"receive":"2020-08-10T04:21:39.875Z","handle":"2020-08-10T04:21:39.876Z","cache_start":"2020-08-10T04:21:39.884Z","read_cases":"2020-08-10T04:21:40.018Z","judge":"2020-08-10T04:21:40.020Z","done":"2020-08-10T04:21:40.234Z"}