Chapter 2: Getting Started Hello World Hello World Enhanced A simple "Hello World" application that shows the basics of how to use an Actionscr ipt 3.0 class in an application. The Enhanced version adds a name-checking feature. These exam

求两个字符串的最大公共子串的问题，用矩阵法得到复杂度O(M*N)-Find the two largest public string substring problem obtained with the matrix complexity O (M* N)

/* * 题目：如果把明文字母按一定顺序排列成矩阵形式，用另一种顺序选择相应的列输出得到密文，如用“china”为秘钥，对”this is * a book mark“排成矩阵如下： * t h i s i * s a b o o * k m a r k */ -/** Topic: If the plaintext letters arranged in a matrix form according to a certain order, in an