题目链接 写一个数据结构, 支持两种操作. 加入一个字符串, 查找一个字符串是否存在.查找的时候, '.'可以代表任意一个字符. 显然是Trie树, 添加就是正常的添加, 查找的时候只要dfs查找就可以. 具体dfs方法看代码. struct node { node *next[]; int idEnd; node() { memset(next, NULL, sizeof(next)); idEnd = ; } }; class WordDictionary { public: // Adds…

Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any one letter…

Description: Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent a…

我要在这里装个逼啦 class WordDictionary(object): def __init__(self): """ initialize your data structure here. """ self._dict = {} def addWord(self, word): """ Adds a word into the data structure. :type word: str :rtype:…

题意:实现添加单词和查找单词的作用,即实现字典功能. 思路:'.' 可以代表一个任何小写字母,可能是".abc"或者"a.bc"或者"abc.",能应对这三种就没有问题了.在每个单词的尾字母上标上tag=1,代表从树根到此节点有一个单词.暂时想不到更快的办法. class WordDictionary { public: WordDictionary(){ tree=create(); } void addWord(string word) {…

leetcode面试准备:Add and Search Word - Data structure design 1 题目 Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing on…

字典树(查找树) 26个分支作用:检测字符串是否在这个字典里面插入.查找 字典树与哈希表的对比:时间复杂度:以字符来看:O(N).O(N) 以字符串来看:O(1).O(1)空间复杂度:字典树远远小于哈希表 前缀相关的题目字典树优于哈希表字典树可以查询abc是否有ab的前缀 字典树常考点:1.字典树实现2.利用字典树前缀特性解题3.矩阵类字符串一个一个字符深度遍历的问题(DFS+trie) dfs树和trie树同时遍历 word searchIIdfs+hash:时间复杂度大,后面遍历到有些字符就…

Add and Search Word - Data structure design Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or …

Add and Search Word - Data structure design Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or…

字典树(Trie树相关) 208. Implement Trie (Prefix Tree) Implement a trie with insert, search, and startsWith methods. (Medium) Note:You may assume that all inputs are consist of lowercase letters a-z. 分析: 字典树即前缀匹配树,在空间不是很影响的情况下一般采用如下数据结构存储Trie节点 class TrieNod…