反演套 DP 的好题(不用反演貌似也能做 Description Vivek initially has an empty array \(a\) and some integer constant \(m\). He performs the following algorithm: Select a random integer \(x\) uniformly in range from \(1\) to \(m\) and append it to the end of \(a\). Co…
问题描述: 你正在爬楼梯. 它需要n步才能达到顶峰. 每次你可以爬1或2步. 您可以通过多少不同的方式登顶? 注意:给定n将是一个正整数. Example 1: Input: 2 Output: 2 Explanation: There are two ways to climb to the top. 1. 1 step + 1 step 2. 2 steps Example 2: Input: 3 Output: 3 Explanation: There are three ways to…
2020-01-05 11:52:40 问题描述: 问题求解: 好像多次碰到类似的lcs的变种题了,都是套上了回文的壳.这里再次记录一下. 其实本质就是裸的lcs,就出结果了. public int minInsertions(String s) { StringBuffer sb = new StringBuffer(s); String b = sb.reverse().toString(); return s.length() - lcs(s, b); } public int lcs(S…