说明：  利用Huffman进行通信可以提高信道利用率、缩短传输时间。要求为使用Huffman编码的通信系统实现信息收发编写程序，以顺序存储结构方式存储二叉树，实现Huffman编译码。
(Huffman used to communicate channel utilization can be improved to shorten the transmission time. Requirements for the use of Huffman coding of communications systems send and receive programming information to be stored in binary storage structure in order to achieve Huffman encoding and decoding.)