利用哈夫曼编码进行通信可以大大提高信道利用率，缩短信息传输时间，降低传输成 本。但是，这要求在发送端通过一个编码系统对待传数据预先编码，在接收端将传来的数据进行译码(复原)。对于双工信道(即可以双向传输信息的信道)，每端都需要一个完整的编 /译码系统。试为这样的信息收发站写一个哈夫曼码的编/译码系统。-The use of Huffman coding can greatly improve the communication channel utilization, shorten the transmission time information, reducing transmission costs. However, this requires the sending end through a coding system for mass treatment of pre-encoded data in the receiver will decode the data from (to recover). The duplex channel (that is, to a two-way channel of information transmission), each client requires a full encoder/decoder system. Test for this kind of information hubs and write a Huffman code encoder/decoder system.