huffman树可以通过输入的权值和结点值来唯一确定。然后根据最优二叉树原理来编码。左孩子的路径上记下0,右孩子记下1-Huffman tree can be imported duty and the right node only to determine value. According to the principle of optimal encoding binary tree. Children left on the path down 0 and the right note of a child