foo.cc: In function 'int main()':
foo.cc:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i=0;i<g[k].size();i++)
                         ~^~~~~~~~~~~~

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

{"receive":"2020-05-27T02:41:23.685Z","handle":"2020-05-27T02:41:23.685Z","cache_start":"2020-05-27T02:41:23.693Z","read_cases":"2020-05-27T02:41:24.192Z","judge":"2020-05-27T02:41:24.193Z","done":"2020-05-27T02:41:24.915Z"}