[알고리즘] 트라이 구현

트라이 구현

책 풀이

class TrieNode:
    def __init__(self):
        self.word = False
        self.children = collections.defaultdict(TrieNode)

class Trie:
    def __init__(self):
        self.root = TrieNode()

    # 단어 삽입
    def insert(self, word: str) -> None:
        node = self.root
        for char in word:
            node = node.children[char]
        node.word = True

    def search(self, word: str) -> bool:
        node = self.root
        for char in word:
            if char not in node.children:
                return False
            node = node.children[char]

        return node.word

    def startsWith(self, prefix: str) -> bool:
        node = self.root
        for char in prefix:
            if char not in node.children:
                return False
            node = node.children[char]
        return True