用C语言实现词法分析，是生成编译器的基础，很实用。-Lexical analysis, using C language is the basis to generate the compiler, it is practical.

c++动态规划问题之多边形游戏，输出游戏的可能最大值，很不错的资源-problem of polygon c++ dynamic programming game, the game possible maximum output, very good resource