最优二叉树或哈夫曼树 　在权为wl，w2，…，wn的n个叶子所构成的所有二叉树中，带权路径长度最小(即代价最小)的二叉树称为最优二叉树或哈夫曼树。-Optimal Huffman tree or trees in the right for wl, w2, ..., wn are the n-leaf binary tree consisting of all with the right to a minimum path length (that is, the minimum pri