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.
Example:
addWord("bad")
addWord("dad")
addWord("mad")
search("pad") -> false
search("bad") -> true
search(".ad") -> true
search("b..") -> true
Note:
You may assume that all words are consist of lowercase letters a-z.
Accepted
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Submissions
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Solution1:(TLE)
class WordDictionary:
def __init__(self):
"""
Initialize your data structure here.
"""
self.l = []
def addWord(self, word):
"""
Adds a word into the data structure.
:type word: str
:rtype: void
"""
self.l.append(word)
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
"""
def judge(a,b):
if len(a)!=len(b):
return False
i = 0
while i<len(word):
if a[i]==b[i]:
i += 1
continue
if b[i]=='.':
i += 1
continue
return False
return True
for w in self.l:
if judge(w,word):
return True
return False
# Your WordDictionary object will be instantiated and called as such:
# obj = WordDictionary()
# obj.addWord(word)
# param_2 = obj.search(word)
12 / 13 test cases passed.
Solution2:
import collections
class Node:
def __init__(self):
self.children = collections.defaultdict(Node)
self.isword = False
class WordDictionary:
def __init__(self):
"""
Initialize your data structure here.
"""
self.root = Node()
def addWord(self, word):
"""
Adds a word into the data structure.
:type word: str
:rtype: void
"""
current = self.root
for w in word:
current = current.children[w]
current.isword = True
return
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.match(word,0,self.root)
def match(self,word,index,root):
if root==None:
return False
if index== len(word):
return root.isword
if word[index] != '.':
return root != None and self.match(word,index+1,root.children.get(word[index]))
else:
for child in root.children.values():
if self.match(word,index+1,child):
return True
return False
# Your WordDictionary object will be instantiated and called as such:
# obj = WordDictionary()
# obj.addWord(word)
# param_2 = obj.search(word)