foo.cc: In function 'int main()':
foo.cc:56:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:63:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&cache);
    ~~~~~^~~~~~~~~~~~~

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

{"receive":"2020-08-07T12:54:27.756Z","handle":"2020-08-07T12:54:27.756Z","cache_start":"2020-08-07T12:54:27.763Z","read_cases":"2020-08-07T12:54:27.871Z","judge":"2020-08-07T12:54:27.874Z","done":"2020-08-07T12:54:28.121Z"}