Huffman~

  树的哈夫曼编码。在文档文件中每行以“a:”“b：”的形式输入多个字符及其出现频率。在界 面上点击获取编码，界面上输入数字进行哈夫曼的编码，输入字母可以实现哈夫曼的译码。输入错误字符是提示输入有误。 (Huffman tree. Each line in the document file to " a:" " b:" Enter the number of characters in the form of its frequency. Click for code in the interface, the interface input Huffman coding numbers, enter letters, Huffman decoding can be achieved. Input error is prompted to enter the wrong character.)