哈弗曼树编码，给定电文进行哈夫曼编码，给定编码进行哈夫曼译码。要求电文存储在文件1中，编码后的结果存储在文件2中，给定编码存储在文件3中，译码后的结果存储在文件4中。-Ha Fuman tree coding, given the message to Huffman coding, Huffman coding given decoding. Requested message is stored in the file 1, the encoded result is stored in a file 2, for a given code is stored in the file 3, the decoding results stored in the file after the 4.