Pattern 10: Trie
Comes up in: DSA, Frontend system design
This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.
What it covers
- insert/search/startsWith
- storing counts or top results per node for autocomplete
- memory trade-offs
- trie + DFS on a board
Words you will know
What you will practise
- implement-trie (M)
- autocomplete-system (M, design flavour)
- word-search-ii (H)
Interview questions this answers
- How would you build autocomplete with a trie? How do you return the top suggestions quickly?