2020 HDU多校 第二场 12-String Distance（DP + 序列自动机）

题目连接: 12-String Distancephp Description 题意：给出串a, b, 求给定询问长度的a串与b串的距离html For two strings S and T, you can do the following operation for arbitrary number of times: Select a string S or T, insert or de

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