foo.cc: In function 'int main()':
foo.cc:33:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:35:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
   ~~~~~^~~~~~~~~~~~

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

{"receive":"2020-07-25T03:06:03.893Z","handle":"2020-07-25T03:06:03.893Z","cache_start":"2020-07-25T03:06:03.901Z","read_cases":"2020-07-25T03:06:04.086Z","judge":"2020-07-25T03:06:04.087Z","done":"2020-07-25T03:06:04.783Z"}