foo.cc: In function 'int main()':
foo.cc:5:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &L, &M);
  ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:10:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &b, &e);
   ~~~~~^~~~~~~~~~~~~~~~~

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

{"receive":"2020-06-27T05:47:27.844Z","handle":"2020-06-27T05:47:27.844Z","cache_start":"2020-06-27T05:47:27.856Z","read_cases":"2020-06-27T05:47:27.996Z","judge":"2020-06-27T05:47:28.003Z","done":"2020-06-27T05:47:28.517Z"}