foo.cc: In function 'int main()':
foo.cc:38:8: 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":"2020-07-22T01:18:34.651Z","handle":"2020-07-22T01:18:34.651Z","cache_start":"2020-07-22T01:18:34.658Z","read_cases":"2020-07-22T01:18:34.784Z","judge":"2020-07-22T01:18:34.785Z","done":"2020-07-22T01:18:35.798Z"}