foo.cc: In function 'int main()':
foo.cc:340:7: 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":"2020-08-14T23:16:30.446Z","handle":"2020-08-14T23:16:30.446Z","cache_start":"2020-08-14T23:16:30.454Z","read_cases":"2020-08-14T23:16:30.585Z","judge":"2020-08-14T23:16:30.586Z","done":"2020-08-14T23:16:45.790Z"}