标签:port class 第一个字符 设置 bool one sel repr letters
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.
For example:
addWord("bad") addWord("dad") addWord("mad") search("pad") -> false search("bad") -> true search(".ad") -> true search("b..") -> true
实现字典树,其中search可以实现正则表达式中的.功能
这个题重点在正则表达式,如果一个单词中第一个字符为. 那么就用.之后的所有字符和字典中的所有字典树进行匹配
1 class WordDictionary(object): 2 3 def __init__(self): 4 self.root = {} 5 6 7 def addWord(self, word): 8 cur = self.root 9 for c in word: 10 cur = cur.setdefault(c,{}) 11 cur[None] = None 12 13 14 def search(self, word): 15 def find(word,node): 16 if not word: 17 return None in node 18 c,w = word[0],word[1:] 19 if c != ‘.‘: 20 return c in node and find(w,node[c]) 21 return any(find(w,nd) for nd in node.values() if nd) 22 return find(word,self.root)
不明白为什么设置node.is_word会错误。。
[leetcode trie]211. Add and Search Word - Data structure design
标签:port class 第一个字符 设置 bool one sel repr letters
原文地址:http://www.cnblogs.com/fcyworld/p/6516556.html