为了最大程度地节约存储空间，经常需要把信息进行编码。一种很有效的编码方法是用数字来表示一串字符。假设这些字符串都是由不重复的英文小写字母组成的，且每个字符串中的英文字母都是从小到大排列的。



这个编码系统按照如下的方式工作：



◦ 字符串是按照长度从小到大的顺序排列的

◦ 长度相同的字符串，是按照字典序排列的

-In order to save storage space to the greatest extent, often need to information coding. A very effective method of encoding numbers represent a string of characters. Assuming that these strings are not repeat the lowercase letters of the English, and each string of letters of the alphabet are arranged from small to large. This coding system work in accordance with the following: ◦　string in accordance with the length of the small to order ◦　length strings arranged in lexicographical