Python Snippet

Trie Implementation in Python

Difficulty: Medium

A trie (prefix tree) stores strings character-by-character so prefix queries run in O(length) instead of O(N * length). The Pythonic shape uses a dict of dicts plus a sentinel key for 'word ends here'. This entry covers the dict-of-dicts trie, a class-based variant with explicit nodes, and the autocomplete query you build it for.