foo.cc: In function 'int main()':
foo.cc:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
foo.cc:15:14: 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)

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{"receive":"2020-07-22T08:11:35.819Z","handle":"2020-07-22T08:11:35.819Z","cache_start":"2020-07-22T08:11:35.825Z","read_cases":"2020-07-22T08:11:39.441Z","judge":"2020-07-22T08:11:39.442Z","done":"2020-07-22T08:11:41.185Z"}