foo.c: In function 'main':
foo.c:48:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&a);
  ^

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

{"receive":"2020-04-27T10:37:54.387Z","handle":"2020-04-27T10:37:54.387Z","done":"2020-04-27T10:37:54.868Z"}