说明：  动态编程算法比较全面的简介，从低阶到高阶逐渐提升，有助于对于理解动态编程算法。文档中对于某些算法还给出了相应源代码
(The document is a introduce of dynamic programming algorithm easy to difficulty. It is useful for understanding the dynamic programming algorithm. Especially, the document give some sources of progamm.)