根据最常用的链表法进行huffman编码，可以手工预制权重，例如n=8的时候即可以在文件中写入，输出相应的编码结果-According to the most commonly used method of Chain Huffman coding, manual can be prefabricated weight, For example, n = 8 when it is written in the document, the output corresponding to the coding results