foo.cc: In function 'int main()':
foo.cc:38:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld%lld%lld%lld",&n,&m,&k,&x);
                                          ^

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

{"receive":"2020-03-26T10:52:56.827Z","handle":"2020-03-26T10:52:56.827Z","cache_start":"2020-03-26T10:52:56.835Z","read_cases":"2020-03-26T10:52:57.319Z","judge":"2020-03-26T10:52:57.320Z","done":"2020-03-26T10:52:58.138Z"}