本算法的作用是利用建立的huffman编码进行编码和译码。首先要建立huffman树，其主要的思想是权大的外结点靠近根，权小的远离根。大体的算法是在n个结点中不断的选取两个相对小的结点建立huffman树，直到全部结点都在huffman树中。-The role of this algorithm is the use of established code huffman encoding and decoding. First of all, to establish huffman tree