foo.c: In function 'buildFBItree':
foo.c:35:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
foo.c: In function 'main':
foo.c:42:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ^
foo.c:45:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", str);
  ^

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

{"receive":"2020-03-30T13:52:36.508Z","handle":"2020-03-30T13:52:36.508Z","cache_start":"2020-03-30T13:52:36.516Z","read_cases":"2020-03-30T13:52:36.624Z","judge":"2020-03-30T13:52:36.634Z","done":"2020-03-30T13:52:37.035Z"}