foo.cc: In function 'int main()':
foo.cc:4:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~

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

{"receive":"2020-05-28T08:08:35.957Z","handle":"2020-05-28T08:08:35.957Z","cache_start":"2020-05-28T08:08:35.966Z","read_cases":"2020-05-28T08:08:36.456Z","judge":"2020-05-28T08:08:36.456Z","done":"2020-05-28T08:08:36.566Z"}