foo.cc: In function 'bool check(int, int)':
foo.cc:91:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
foo.cc: In function 'int main()':
foo.cc:115:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", s);
  ~~~~~^~~~~~~~~

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

{"receive":"2020-07-16T13:18:05.666Z","handle":"2020-07-16T13:18:05.666Z","cache_start":"2020-07-16T13:18:05.673Z","read_cases":"2020-07-16T13:18:05.792Z","judge":"2020-07-16T13:18:05.792Z","done":"2020-07-16T13:18:07.515Z"}