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-Given message Huffman coding, Huffman decoding given code. The result is stored in the message storage requirements Document 1, the encoded file 2, a given code is stored in