Trie Topics

Master essential trie problems and patterns frequently asked in interviews.

•   01 Insert & Search in Trie Basic operations: insert words and search prefixes
•   02 Prefix Count Count number of words with given prefix using trie
•   03 Longest Common Prefix Find common prefix of multiple strings efficiently
•   04 Word Search / Dictionary Matching Use trie to match multiple patterns in a grid or text
•   05 Autocomplete / Suggestion System Return all words starting with given prefix efficiently

WONDERING, HOW DOES IT COVER PATTERNS?
These problems cover the most important trie patterns for interviews:

Insert & Search in Trie → Basic trie construction and prefix search operations.
Prefix Count → Track count of words sharing a prefix using node counts.
Longest Common Prefix → Traverse trie until branching to find shared prefix.
Word Search / Dictionary Matching → Use trie to match multiple patterns efficiently in a grid or text.
Autocomplete / Suggestion System → DFS/BFS from prefix node to find all valid completions.

Together, they ensure you understand trie construction, prefix counting, common prefix extraction, pattern matching, and autocomplete systems.