foo.cc: In function 'int main()':
foo.cc:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&L,&M);
     ~~~~~^~~~~~~~~~~~~~~
foo.cc:13:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d %d",&start,&end);
      ~~~~~^~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-07T12:42:47.038Z","handle":"2020-08-07T12:42:47.038Z","cache_start":"2020-08-07T12:42:47.086Z","read_cases":"2020-08-07T12:42:47.213Z","judge":"2020-08-07T12:42:47.216Z","done":"2020-08-07T12:42:48.392Z"}