Master Data Structures & Algorithms
Visually intuitive explanations for complex DSA concepts. Search for a problem or explore our curated list.
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View all →Two Sum
EasyFind two numbers that add up to a target using hash map.
Valid Parentheses
EasyCheck if parentheses string is valid using stack approach.
Add Two Numbers
MediumAdd two numbers represented as linked lists with carry.
Binary Tree Inorder Traversal
EasyTraverse binary tree inorder using recursive and iterative approaches.
Reverse a Linked List
EasyReverse a singly linked list.
Longest Substring Without Repeating Characters
MediumFind the longest substring without repeating characters using sliding window.
Maximum Depth of Binary Tree
EasyCalculate the maximum depth of a binary tree using recursive approach.
Merge Intervals
MediumMerge all overlapping intervals using sorting approach.
Length of Last Word
EasyFind the length of the last word in a string using reverse traversal.