外部资料索引

1 trie树和tenary search数

1).http://igoro.com/archive/efficient-auto-complete-with-a-ternary-search-tree/
2).http://www.cnblogs.com/rush/archive/2012/12/30/2839996.html

2 字符编码笔记：ASCII，Unicode和UTF-8

http://www.ruanyifeng.com/blog/2007/10/ascii_unicode_and_utf-8.html