208. Implement Trie (Prefix Tree)

원문: https://doljae.tistory.com/144

[Implement Trie (Prefix Tree) - LeetCode

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leetcode.com](https://leetcode.com/problems/implement-trie-prefix-tree/)

1. Trie 자료구조 구현

class Trie:
    def __init__(self):
        self.head = Node()

    def insert(self, word: str) -> None:
        cur = self.head
        for char in word:
            if char not in cur.child:
                new_node = Node(char)
                cur.child[char] = new_node
            cur = cur.child[char]
        cur.child["*"] = "!"

    def search(self, word: str) -> bool:
        cur = self.head
        for char in word:
            if char not in cur.child:
                return False
            cur = cur.child[char]
        if "*" in cur.child:
            return True

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

class Node:
    def __init__(self, val="0"):
        self.val = val
        self.child = {}

    def __str__(self):
        return f"val: {self.val}, child:{self.child}"

스스로도 한 번에 통과해서 놀랐다.

Trie 정도는 어느샌가 그냥 구현할 수 있게 되어서 나름대로 만족한다.