foo.cc: In function 'int main()':
foo.cc:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:22:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(i=1;i<=n;i++)scanf("%d",&a[i]);
                   ~~~~~^~~~~~~~~~~~

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

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{"receive":"2020-07-27T11:46:17.732Z","handle":"2020-07-27T11:46:17.732Z","cache_start":"2020-07-27T11:46:17.739Z","read_cases":"2020-07-27T11:46:18.336Z","judge":"2020-07-27T11:46:18.337Z","done":"2020-07-27T11:46:18.814Z"}