class TrieNode:
def __init__(self):
self.is_string=False
self.leaves={}
class WordDictionary(object):
def __init__(self):
"""
initialize your data structure here.
"""
self.root=TrieNode()
def addWord(self, word):
"""
Adds a word into the data structure.
:type word: str
:rtype: void
"""
cur=self.root
for c in word:
if c not in cur.leaves:
cur.leaves[c]=TrieNode()
cur=cur.leaves[c]
cur.is_string=True
def search(self, word):
"""
Returns if the word is in the data structure. A word could
contain the dot character '.' to represent any one letter.
:type word: str
:rtype: bool
"""
return self.recursion(word,0,self.root)
def recursion(self,word,start,cur):
if start==len(word):
return cur.is_string
if word[start] in cur.leaves:
return self.recursion(word,start+1,cur.leaves[word[start]])
elif word[start]=='.':
for c in cur.leaves:
if self.recursion(word,start+1,cur.leaves[c]):
return True
return False
# Your WordDictionary object will be instantiated and called as such:
# wordDictionary = WordDictionary()
# wordDictionary.addWord("word")
# wordDictionary.search("pattern")
211. Add and Search Word - Data structure design
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