foo.cc: In function 'int main()':
foo.cc:57:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld", &n, &s);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:60:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld %lld", &u, &v, &w);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-05-28T03:30:58.147Z","handle":"2020-05-28T03:30:58.147Z","cache_start":"2020-05-28T03:30:58.154Z","read_cases":"2020-05-28T03:30:58.264Z","judge":"2020-05-28T03:30:58.266Z","done":"2020-05-28T03:31:01.448Z"}