实现哈夫曼树，可以动态演示，当输入一个字符型串，就可以生成哈夫曼树-Achieve Huffman tree can be dynamic presentation, when to enter a character string, you can generate Huffman trees

基于改进哈夫曼编码的大规模动态图可达查询方法研究 -Based on the improved Huffman encoding of large-scale dynamic figure of query methods research