最长公共子序列的Nakatsu算法

　　最长公共子序列(Longest Common Subsequence，LCS)是将两个给定字符串分别删去零个或多个字符后得到的长度最长的相同字符序列。

-Nakatsu longest common subsequence algorithm is the longest common subsequence (Longest Common Subsequence, LCS) is given two strings are deleting zero or the same as the length of the longest sequence of characters obtained after multiple characters.