2020 HDU多校 第二場 12-String Distance（DP + 序列自動機）

題目連接: 12-String Distancephp Description 題意：給出串a, b, 求給定詢問長度的a串與b串的距離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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