Practice Problems
Sharpen your coding skills with our collection of practice problems.
Two Sum
Easy
1250 solvedFind two numbers in an array that add up to a target value.
ArraysLinked List Cycle
Easy
980 solvedDetermine if a linked list has a cycle in it.
Linked ListsBinary Tree Level Order Traversal
Medium
756 solvedReturn the level order traversal of a binary tree's values.
TreesMerge Intervals
Medium
689 solvedMerge all overlapping intervals and return the non-overlapping intervals.
ArraysWord Search
Medium
542 solvedFind if a word exists in a 2D board of characters.
BacktrackingLRU Cache
Hard
421 solvedDesign and implement a data structure for Least Recently Used (LRU) cache.
Design
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