本题主要是求构造一棵Trie树,即词典树用于统计单词. C#代码如下: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace TestOJ { public class AplusB { static void Main() { TestTrie1(); } private static void T…
原文名称: An Efficient Digital Search Algorithm by Using a Double-Array Structure 作者: JUN-ICHI AOE 译文: 使用双数组结构的一个高效的Digital Search算法 摘要: 本文介绍了一种新的内部(内部排序的内部,也就是在内存里)数组结构的digital search算法,叫做双数组,结合了数组存取的快速和链式存储的压缩.Digital search树的每一条弧在双数组中都可以以O(1)的时间复杂度计算得…
D. Acyclic Organic Compounds You are given a tree T with n vertices (numbered 1 through n) and a letter in each vertex. The tree is rooted at vertex 1. Let's look at the subtree Tv of some vertex v. It is possible to read a string along each simple…