程序实现如下功能：输入一段长度不超过100的字符串，将其进行霍夫曼编码并输出。将编好的霍夫曼码再次输入，输出解码后的字符串。-The program to achieve the following functions: enter a period does not exceed the length of the string of 100, Huffman encoded and output. The programmed the Huffman code again input, output the decoded string.