foo.cc: In function 'int mt(int, int)':
foo.cc:14:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int kx=k;kx<(tr[x].size());kx++){
                      ~~^~~~~~~~~~~~~~~
foo.cc: In function 'void dfs(int)':
foo.cc:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(yc[p][j]==(tr[p].size()) || yc[p][j]==(tr[j].size())) continue;//两者存在包含关系就跳过 
            ~~~~~~~~^~~~~~~~~~~~~~~~
foo.cc:35:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(yc[p][j]==(tr[p].size()) || yc[p][j]==(tr[j].size())) continue;//两者存在包含关系就跳过 
                                        ~~~~~~~~^~~~~~~~~~~~~~~~

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-26T02:56:54.687Z","handle":"2020-02-26T02:56:54.687Z","cache_start":"2020-02-26T02:56:54.694Z","read_cases":"2020-02-26T02:56:54.956Z","judge":"2020-02-26T02:56:54.957Z","done":"2020-02-26T02:56:56.855Z"}