对于一棵无向树，我们可以选择它的任意节点作为根。
For a undirected graph with tree characteristics, we can choose any node as the root.
算法来找到一个层次树在一个有向无环图吗？
Algorithm to find a hierarchy tree in a directed acyclic graph?
文章描述采用计算树的方法求解无向图的生成树，这种方法是通过列举生成树之间的差别来实现的。
The paper presents the method of seeking spanning trees of undirected graphs by adopting calculating trees which is realized by enumerating the difference among spanning trees.
求无向图的生成树是在网络和回路分析中经常遇到的重要问题。
To enumerate all spanning trees in undirected graphs is an important problem that people frequently encounter in the analysis of network and cycle.
给定一个无向图，编写函数找出所有的最小高度树，并返回其根标号的列表。
Given such a graph, write a function to find all the MHTs and return a list of their root labels.
给定一个无向图，编写函数找出所有的最小高度树，并返回其根标号的列表。
Given such a graph, write a function to find all the MHTs and return a list of their root labels.
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