建立哈夫曼树，哈夫曼树，即最优树，是带权路径长度最短的树。有着广泛的应用。在解决某些判定问题上，及字符编码上，有着重要的价值。 -Establish hoffmann tree, the tree of hoffmann, namely, the right path is parent-stand shortest length of the tree. A wide range of applications. In solving some problems, and judge th