foo.cc: In function 'int main(int, char**)':
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld%lld", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-10T03:45:45.874Z","handle":"2020-08-10T03:45:45.874Z","cache_start":"2020-08-10T03:45:45.882Z","read_cases":"2020-08-10T03:45:45.986Z","judge":"2020-08-10T03:45:45.987Z","done":"2020-08-10T03:45:52.436Z"}