foo.cc: In function 'void dfs1(int, int)':
foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[x].size();i++)
              ~^~~~~~~~~~~~
foo.cc: In function 'void dfs2(int, int)':
foo.cc:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[x].size();i++)
              ~^~~~~~~~~~~~

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

正在同步测试数据，请稍后
{"receive":"2020-07-02T12:36:50.129Z","handle":"2020-07-02T12:36:50.129Z","cache_start":"2020-07-02T12:36:50.136Z","read_cases":"2020-07-02T12:36:52.197Z","judge":"2020-07-02T12:36:52.197Z","done":"2020-07-02T12:36:54.352Z"}