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, its main idea is right outside the large node near the root, the right to stay away from small root. In general the algorithm is in the n nodes constantly relatively small selection of the two nodes to establish huffman tree, until all nodes in the huffman tree.