在数据通信中，需要将传送的文字转换成二进制的字符串，用0，1码的不同排列来表示字符。例如，需传送的报文为“AFTER DATA EAR ARE ART AREA”，这里用到的字符集为“A，E，R，T，F，D”，各字母出现的次数为{8，4，5，3，1，1}。现要求为这些字母设计编码。-In data communications, the need to send the text converted into a binary string, with the 0,1 code arranged to represent different characters. For example, the need to send the message as " AFTER DATA EAR ARE ART AREA" , where the character set used for the " A, E, R, T, F, D" , the number of times each letter appears as (8,4,5 , 3,1,1). Now required to design codes for these letters.