foo.cc: In function 'int main()':
foo.cc:62:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
foo.cc:65:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&u,&v,&w);
         ~~~~~^~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-10T03:30:33.291Z","handle":"2020-08-10T03:30:33.291Z","cache_start":"2020-08-10T03:30:33.298Z","read_cases":"2020-08-10T03:30:33.415Z","judge":"2020-08-10T03:30:33.416Z","done":"2020-08-10T03:30:34.534Z"}