/in/foo.cc: In function 'int mt(int, int)':
/in/foo.cc:14:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int kx=k;kx<tr[x].size();kx++){
                      ~~^~~~~~~~~~~~~
/in/foo.cc: In function 'void dfs(int)':
/in/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 
            ~~~~~~~~^~~~~~~~~~~~~~
/in/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 
                                      ~~~~~~~~^~~~~~~~~~~~~~