AlgoSolveoRoadmap › Stage 10: Tries & Bits › Pattern 50 of 53
DSA pattern guide
Trie — Basic & Word Break
Prefix search, autocomplete, many words to match.
Use it when
Prefix search, autocomplete, many words to match.
Key idea
Children map per node plus an end-of-word flag. Walk character by character.
Practice problems, in order
- Implement Trie (Prefix Tree)Medium
- Add and Search WordMedium
- Longest Common PrefixMedium
- Search Suggestions SystemMedium
- Word BreakMedium
- Replace WordsMedium
- Concatenated WordsHard
- Word Search IIHard
How to practise this pattern
- Read the problem and look for the signal above before writing any code.
- Say the brute force out loud, with its time complexity, then ask what work it repeats.
- Apply the key idea and write the optimised version yourself.
- If you're stuck for more than 10 minutes, take one small hint, not the full solution.
- Move to the next problem only when you can explain why this pattern fits.
Stuck on one of these?
The AlgoSolveo extension (free, launching soon) sits beside the LeetCode problem and gives the smallest hint that gets you moving, never the full answer. Solved problems tick off on your roadmap.
Join the extension waitlistTrack it on the roadmap