"""
Trie (Prefix Tree) implementation.
Used for efficient string prefix searches and autocomplete.
"""

from typing import Dict, List, Optional


class TrieNode:
    """Node in the trie."""

    def __init__(self):
        self.children: Dict[str, 'TrieNode'] = {}
        self.is_end = False


class Trie:
    """Trie data structure for string storage and prefix search."""

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

    def insert(self, word: str) -> None:
        """Insert a word into the trie."""
        pass

    def delete(self, word: str) -> None:
        """Delete a word from the trie."""
        pass

    def find(self, prefix: str) -> List[str]:
        """Find all words with the given prefix."""
        pass
