Tries

Prefix trees for autocomplete and word search.

Foundation

Learn the invariant, apply it independently, then pass the Tries checkpoint.

Implement trie methods (Medium)

Checkpoint

A graded check of the core Tries reasoning skills.

Pattern Quest

Practice recognizing tries problem shapes.

Tries

Practice representing shared prefixes as paths, distinguishing complete words from prefixes, and using trie traversal for dictionary and search tasks.

Find Distinct Palindromic Substrings (Hard)
Longest repeated substring (Medium)