foo.cc: In function 'int main()':
foo.cc:54:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~

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

{"receive":"2020-08-08T11:48:34.107Z","handle":"2020-08-08T11:48:34.107Z","cache_start":"2020-08-08T11:48:34.114Z","read_cases":"2020-08-08T11:48:34.221Z","judge":"2020-08-08T11:48:34.222Z","done":"2020-08-08T11:48:34.351Z"}