Approach Summary
Insert all words into a Trie, marking word ends. BFS/DFS through Trie: only traverse edges where a word ends. Track the longest path.
How to Recognize This Pattern
- Word is valid only if every prefix is also a word
- Trie traversal: only follow complete-word nodes
Complexity Analysis
Time Complexity
O(∑ word lengths)
Space Complexity
O(∑ word lengths)
Tags
Array Hash Table String Trie Sorting