Needleman 和 Wunsch 提出的动态规划算法，这个算法是最早的最经典的双序列比对算法，就是针对寻求全局最佳序列比对这一问题所设计的动态规划寻优策略。(Needleman and Wunsch proposed a dynamic programming algorithm, this algorithm is the most classical algorithm of double sequence alignment of the earliest, is to seek th