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:14:44: error: expected primary-expression before '/' token
         for(int kx=k;kx<tr[x].size();kx++){/
                                            ^
foo.cc:15:13: error: expected primary-expression before 'if'
             if(tr[x][kx]!=tr[y][ky++]){
             ^~
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:35:46: 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)