foo.cc: In function 'void init()':
foo.cc:67:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&e1[i].from,&e1[i].to,&e1[i].w);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-09T13:17:25.917Z","handle":"2020-08-09T13:17:25.917Z","cache_start":"2020-08-09T13:17:25.924Z","read_cases":"2020-08-09T13:17:26.055Z","judge":"2020-08-09T13:17:26.058Z","done":"2020-08-09T13:17:26.662Z"}