foo.cc: In function 'void dfs(int, int, int)':
foo.cc:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<roud[x].size();i++)dfs(roud[x][i],minc,x);
                  ^

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

{"receive":"2020-04-08T02:31:53.222Z","handle":"2020-04-08T02:31:53.222Z","cache_start":"2020-04-08T02:31:53.230Z","read_cases":"2020-04-08T02:31:55.769Z","judge":"2020-04-08T02:31:55.769Z","done":"2020-04-08T02:31:57.592Z"}