LeetCode:Distinct Subsequences
我的LeetCode解題報告索引 題目鏈接 Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new ...
原文：UVa 10069 Distinct Subsequences（經典DP）
題意： 給定 個字符串a, b，求b在a中出現的次數。要求可以是不連續的，但是b在a中的順序必須和b以前的一致。 思路： 類似於數字分解的題目。dp i j 表示：b的前j個字符在a的前i個字符中出現的次數。 似乎這種表示方法司空見慣，但是一開始我還真沒能搞懂如何去遞推。事情的真相是： 如果a i b j 則 dp i j dp i j dp i j 如果a i b j 則 dp i j dp i ...
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