LeetCode:Distinct Subsequences
我的LeetCode解题报告索引 题目链接 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（经典DP）
题意： 给定 个字符串a, b，求b在a中出现的次数。要求可以是不连续的，但是b在a中的顺序必须和b以前的一致。 思路： 类似于数字分解的题目。dp i j 表示：b的前j个字符在a的前i个字符中出现的次数。 似乎这种表示方法司空见惯，但是一开始我还真没能搞懂如何去递推。事情的真相是： 如果a i b j 则 dp i j dp i j dp i j 如果a i b j 则 dp i j dp i ...
2012-11-16 11:26 0 4384 推荐指数：
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