foo.cc: In function 'int main()':
foo.cc:12:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",a);
  ~~~~~^~~~~~~~

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

{"receive":"2020-06-29T15:04:58.989Z","handle":"2020-06-29T15:04:58.989Z","cache_start":"2020-06-29T15:04:58.998Z","read_cases":"2020-06-29T15:04:59.128Z","judge":"2020-06-29T15:04:59.131Z","done":"2020-06-29T15:04:59.649Z"}