Tag

Hash Table Problems

Problems solved with hash maps or sets for O(1) lookup, deduplication, or grouping. (13 problems)

Easy · 3

Two Sumeasy Contains Duplicateeasy Valid Anagrameasy

Medium · 9

Longest Consecutive Sequencemedium Top K Frequent Elementsmedium Group Anagramsmedium Set Matrix Zeroesmedium Longest Substring Without Repeating Charactersmedium Longest Repeating Character Replacementmedium Construct Binary Tree from Preorder and Inorder Traversalmedium Clone Graphmedium Word Breakmedium

Hard · 1

Minimum Window Substringhard