DSA Visualizer

Master algorithm patterns through interactive animations for 180+ problems. Learn core patterns in arrays, trees, graphs, dynamic programming, and more.

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Array & Hashing(17 problems)

Contains Duplicate

Easyarrayhash-tablesorting
AmazonAppleMicrosoftGoogle
→

Valid Anagram

Easystringhash-tablesorting
AmazonFacebookBloombergGoogle
→

Two Sum

Easyarrayhash-table
AmazonGoogleFacebookMicrosoftApple
→

Group Anagrams

Mediumarrayhash-tablestringsorting
AmazonFacebookGoogleMicrosoftBloomberg
→

Top K Frequent Elements

Mediumarrayhash-tableheapbucket-sort
AmazonFacebookGoogleMicrosoftUber
→

Encode and Decode Strings

Mediumarraystringdesign
GoogleFacebookAmazonMicrosoft
→

Product of Array Except Self

MediumArrayPrefix Sum
AmazonFacebookMicrosoftAppleGoogle
→

Valid Sudoku

MediumHash TableMatrix
AmazonGoogleFacebookApple
→

Longest Consecutive Sequence

Mediumarrayhash-tableunion-find
AmazonGoogleFacebookMicrosoftBloomberg
→

Contains Duplicate II

Easyhash-tablesliding-window
AmazonGoogleApple
→

Majority Element

Easyarrayhash-tabledivide-and-conquer
AmazonGoogleAdobeApple
→

Intersection of Two Arrays

Easyarrayhash-tabletwo-pointersbinary-search
AmazonFacebookGoogle
→

Isomorphic Strings

Easyhash-tablestring
AmazonLinkedInGoogle
→

Word Pattern

Easyhash-tablestring
AmazonGoogleUber
→

Summary Ranges

Easyarray
AmazonGoogle
→

Move Zeroes

Easyarraytwo-pointers
FacebookAmazonBloomberg
→

Remove Element

Easyarraytwo-pointers
AmazonGoogleMicrosoft
→

Two Pointers(5 problems)

Valid Palindrome

Easystringtwo-pointers
FacebookAmazonMicrosoftBloomberg
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Two Sum II - Input Array Is Sorted

Easytwo-pointersarray
AmazonGoogleFacebookMicrosoft
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3Sum

Mediumtwo-pointersarraysorting
AmazonFacebookMicrosoftGoogleApple
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Container With Most Water

Mediumtwo-pointersarraygreedy
AmazonFacebookBloombergGoogle
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Trapping Rain Water

Hardarraytwo-pointersstackdynamic-programming
AmazonGoogleFacebookMicrosoftApple
→

Sliding Window(7 problems)

Best Time to Buy and Sell Stock

EasyArrayGreedySliding Window
AmazonFacebookMicrosoftBloombergGoogle
→

Longest Substring Without Repeating Characters

Mediumsliding-windowhash-tablestring
AmazonFacebookGoogleMicrosoftBloomberg
→

Longest Repeating Character Replacement

Mediumstringsliding-windowhash-table
AmazonGoogleFacebook
→

Permutation in String

Mediumstringsliding-windowhash-tabletwo-pointers
AmazonFacebookMicrosoftGoogle
→

Minimum Window Substring

Hardsliding-windowhash-tablestring
FacebookAmazonGoogleMicrosoftUber
→

Sliding Window Maximum

Hardsliding-windowdequearraymonotonic-queue
AmazonGoogleFacebookMicrosoft
→

Minimum Size Subarray Sum

Mediumsliding-windowarrayprefix-sum
AmazonFacebookGoogle
→

Stack(6 problems)

Valid Parentheses

Easystackstring
AmazonFacebookGoogleMicrosoftBloomberg
→

Min Stack

Easystackdesign
AmazonGoogleFacebookBloomberg
→

Evaluate Reverse Polish Notation

Mediumstackarray
AmazonFacebookLinkedIn
→

Generate Parentheses

Mediumstackbacktrackingrecursion
AmazonFacebookGoogleMicrosoft
→

Daily Temperatures

Mediumarraystackmonotonic-stack
AmazonFacebookGoogleBloomberg
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Car Fleet

Mediumarraystacksortingmonotonic-stack
AmazonGoogleFacebook
→

Binary Search(8 problems)

Binary Search

Easyarraybinary-search
AmazonMicrosoftGoogleFacebook
→

Search a 2D Matrix

Mediumbinary-searchmatrixarray
AmazonGoogleFacebookMicrosoft
→

Koko Eating Bananas

Mediumbinary-searcharray
AmazonGoogleFacebook
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Find Minimum in Rotated Sorted Array

Mediumbinary-searcharray
AmazonMicrosoftFacebookGoogle
→

Search in Rotated Sorted Array

Mediumbinary-searcharray
AmazonMicrosoftFacebookLinkedInBloomberg
→

Search in Rotated Sorted Array II

Mediumbinary-searcharray
AmazonMicrosoftFacebook
→

Time Based Key-Value Store

Mediumbinary-searchhash-tabledesign
AmazonGoogleFacebook
→

Median of Two Sorted Arrays

Hardbinary-searcharraydivide-and-conquer
GoogleAmazonMicrosoftFacebookApple
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Linked List(13 problems)

Reverse Linked List

EasyLinked ListRecursion
AmazonMicrosoftFacebookGoogleApple
→

Merge Two Sorted Lists

Easylinked-listrecursion
AmazonMicrosoftFacebookGoogle
→

Reorder List

Mediumlinked-listtwo-pointersrecursion
AmazonFacebookGoogleMicrosoft
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Remove Nth Node From End of List

Mediumlinked-listtwo-pointers
AmazonMicrosoftFacebookGoogle
→

Copy List with Random Pointer

Mediumlinked-listhash-table
AmazonMicrosoftFacebookGoogle
→

Add Two Numbers

Mediumlinked-listmath
AmazonMicrosoftFacebookBloombergGoogle
→

Linked List Cycle

Easylinked-listtwo-pointers
AmazonMicrosoftFacebookGoogleYahoo
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Linked List Cycle II

Mediumlinked-listtwo-pointers
AmazonMicrosoftFacebookGoogle
→

Find the Duplicate Number

Mediumarraytwo-pointersbinary-search
AmazonMicrosoftFacebookGoogle
→

Remove Duplicates from Sorted List II

Mediumlinked-listtwo-pointers
AmazonMicrosoftBloomberg
→

LRU Cache

MediumDesignHash TableLinked ListDoubly-Linked List
AmazonFacebookGoogleMicrosoftApple
→

Merge K Sorted Lists

Hardlinked-listheapdivide-and-conquer
AmazonFacebookGoogleMicrosoftUber
→

Reverse Nodes in k-Group

Hardlinked-listrecursion
AmazonFacebookGoogleMicrosoft
→

Trees(16 problems)

Invert Binary Tree

Easytreedepth-first-searchrecursion
GoogleAmazonFacebookMicrosoft
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Maximum Depth of Binary Tree

Easytreedepth-first-searchrecursion
AmazonMicrosoftFacebookGoogleLinkedIn
→

Diameter of Binary Tree

Easytreedepth-first-searchrecursion
AmazonFacebookGoogleMicrosoft
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Balanced Binary Tree

Easytreedepth-first-searchrecursion
AmazonFacebookBloombergMicrosoft
→

Same Tree

Easytreedepth-first-searchrecursion
AmazonGoogleFacebookBloomberg
→

Subtree of Another Tree

Easytreedepth-first-searchrecursion
AmazonFacebookGoogleMicrosoft
→

Lowest Common Ancestor of a Binary Search Tree

Mediumtreebinary-search-treedepth-first-search
AmazonFacebookMicrosoftGoogleLinkedIn
→

Binary Tree Level Order Traversal

Mediumtreebreadth-first-searchqueue
AmazonFacebookMicrosoftGoogleLinkedIn
→

Binary Tree Right Side View

Mediumtreebreadth-first-searchdepth-first-search
AmazonFacebookGoogleMicrosoft
→

Count Good Nodes in Binary Tree

Mediumtreedepth-first-searchrecursion
AmazonMicrosoftFacebook
→

Validate Binary Search Tree

Mediumtreebinary-search-treedepth-first-search
AmazonFacebookMicrosoftGoogleBloomberg
→

Kth Smallest Element in a BST

Mediumtreebinary-search-treein-order-traversal
AmazonGoogleFacebookMicrosoft
→

Construct Binary Tree from Preorder and Inorder

Mediumtreearraydivide-and-conquerrecursion
AmazonMicrosoftFacebookGoogleBloomberg
→

Construct Binary Tree from Preorder and Inorder Traversal

Mediumtreearraydivide-and-conquerrecursion
AmazonMicrosoftFacebookGoogleBloomberg
→

Binary Tree Maximum Path Sum

Hardtreedepth-first-searchrecursiondynamic-programming
AmazonFacebookGoogleMicrosoftApple
→

Serialize and Deserialize Binary Tree

Hardtreedesigndepth-first-searchbreadth-first-search
AmazonFacebookGoogleMicrosoftBloomberg
→

Tries(1 problems)

Implement Trie (Prefix Tree)

MediumTrieDesignString
AmazonGoogleFacebookMicrosoftUber
→

Heap / Priority Queue(7 problems)

Kth Largest Element in an Array

Mediumheapquickselectsorting
AmazonFacebookGoogleMicrosoftApple
→

Last Stone Weight

Easyheappriority-queuesimulation
AmazonFacebookGoogle
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K Closest Points to Origin

Mediumheapsortinggeometry
AmazonFacebookGoogleMicrosoftAsana
→

Kth Largest Element in a Stream

Easyheappriority-queuedesign
AmazonFacebookGoogle
→

Task Scheduler

Mediumheapgreedyhash-table
AmazonFacebookGoogleMicrosoft
→

Design Twitter

Mediumheaphash-tabledesign
AmazonTwitterFacebookGoogle
→

Find Median from Data Stream

Hardheapdesigntwo-heaps
AmazonGoogleFacebookMicrosoftApple
→

Backtracking(9 problems)

Subsets

Mediumbacktrackingrecursionbit-manipulation
AmazonFacebookGoogleMicrosoftBloomberg
→

Combination Sum

Mediumbacktrackingrecursion
AmazonFacebookGoogleMicrosoft
→

Permutations

Mediumbacktrackingrecursion
AmazonFacebookGoogleMicrosoftLinkedIn
→

Subsets II

Mediumbacktrackingrecursion
AmazonFacebookGoogleMicrosoft
→

Combination Sum II

Mediumbacktrackingrecursion
AmazonFacebookGoogle
→

Word Search

Mediumbacktrackingmatrixdepth-first-search
AmazonFacebookGoogleMicrosoftBloomberg
→

Palindrome Partitioning

Mediumbacktrackingstringdynamic-programming
AmazonGoogleFacebookMicrosoft
→

Letter Combinations of a Phone Number

Mediumbacktrackingstring
AmazonFacebookGoogleMicrosoftUber
→

N-Queens

Hardbacktrackingmatrix
AmazonGoogleFacebookMicrosoft
→

Graphs(12 problems)

Number of Islands

MediumGraphDFSBFSMatrix
AmazonFacebookGoogleMicrosoftBloomberg
→

Clone Graph

MediumGraphDFSBFSHash Table
AmazonFacebookGoogleMicrosoftBloomberg
→

Max Area of Island

MediumGraphDFSMatrixIsland
AmazonFacebookGoogleMicrosoftDoorDash
→

Pacific Atlantic Water Flow

MediumGraphDFSMatrixMulti-Source DFS
AmazonGoogleFacebookMicrosoftUber
→

Surrounded Regions

MediumGraphDFSBFSMatrixBorder Traversal
AmazonGoogleFacebookMicrosoftUber
→

Rotting Oranges

MediumGraphBFSMatrixMulti-Source BFS
AmazonFacebookMicrosoftBloombergApple
→

Walls and Gates

MediumGraphBFSMatrixMulti-Source BFS
FacebookGoogleAmazonMicrosoftUber
→

Course Schedule

MediumGraphDFSBFSTopological Sort
AmazonFacebookGoogleMicrosoftUber
→

Course Schedule II

MediumGraphTopological SortDFSBFSCycle Detection
AmazonFacebookGoogleMicrosoftUber
→

Redundant Connection

MediumGraphUnion FindDFSCycle Detection
AmazonGoogleFacebookMicrosoftBloomberg
→

Graph Valid Tree

MediumGraphDFSBFSUnion FindCycle Detection
GoogleFacebookAmazonZenefitsMicrosoft
→

Number of Connected Components In An Undirected Graph

MediumGraphDFSBFSUnion FindConnected Components
GoogleAmazonFacebookMicrosoftLinkedIn
→

1-D Dynamic Programming(13 problems)

Climbing Stairs

EasyDynamic ProgrammingMathMemoization
AmazonGoogleMicrosoftAdobeApple
→

Min Cost Climbing Stairs

EasyDynamic ProgrammingArray
AmazonGoogleMicrosoft
→

House Robber

MediumDynamic ProgrammingArray
AmazonGoogleFacebookMicrosoftLinkedIn
→

House Robber II

MediumDynamic ProgrammingArray
AmazonMicrosoftGoogleFacebook
→

Longest Palindromic Substring

MediumDynamic ProgrammingStringTwo Pointers
AmazonMicrosoftFacebookGoogleApple
→

Palindromic Substrings

MediumDynamic ProgrammingString
FacebookAmazonGoogleMicrosoft
→

Decode Ways

MediumDynamic ProgrammingStringRecursion
AmazonFacebookGoogleMicrosoftUber
→

Coin Change

MediumDynamic ProgrammingArrayBreadth-First Search
AmazonGoogleFacebookMicrosoftBloomberg
→

Maximum Product Subarray

MediumDynamic ProgrammingArray
AmazonMicrosoftLinkedInFacebook
→

Word Break

MediumDynamic ProgrammingStringTrieMemoization
AmazonGoogleFacebookMicrosoftBloomberg
→

Word Break II

HardBacktrackingDynamic ProgrammingStringMemoization
AmazonGoogleFacebookMicrosoftUber
→

Longest Increasing Subsequence

MediumDynamic ProgrammingBinary SearchArray
AmazonGoogleFacebookMicrosoftBloomberg
→

Partition Equal Subset Sum

MediumDynamic ProgrammingArray0/1 Knapsack
AmazonFacebookGoogle
→

2-D Dynamic Programming(11 problems)

Unique Paths

MediumDynamic ProgrammingMathCombinatorics
AmazonGoogleFacebookMicrosoftBloomberg
→

Longest Common Subsequence

MediumDynamic ProgrammingString
AmazonGoogleFacebookMicrosoftBloomberg
→

Best Time to Buy and Sell Stock with Cooldown

MediumDynamic ProgrammingState Machine
AmazonGoogleFacebookMicrosoftBloomberg
→

Coin Change II

MediumDynamic ProgrammingArray
AmazonGoogleFacebook
→

Target Sum

MediumDynamic ProgrammingArrayBacktracking
AmazonFacebookGoogle
→

Interleaving String

MediumDynamic ProgrammingString
AmazonGoogleFacebook
→

Longest Increasing Path in Matrix

HardDynamic ProgrammingDepth-First SearchMatrixMemoization
AmazonGoogleFacebookMicrosoft
→

Distinct Subsequences

HardDynamic ProgrammingString
AmazonGoogleFacebook
→

Edit Distance

HardDynamic ProgrammingString2D DP
AmazonGoogleFacebookMicrosoftBloomberg
→

Burst Balloons

HardDynamic ProgrammingDivide and ConquerInterval DP
GoogleAmazonFacebook
→

Regular Expression Matching

HardDynamic ProgrammingStringRecursionBacktracking
FacebookGoogleAmazonMicrosoftUber
→

Greedy(13 problems)

Maximum Subarray

Mediumarraydynamic-programminggreedy
AmazonMicrosoftLinkedInBloombergApple
→

Jump Game

MediumGreedyArrayDynamic Programming
AmazonGoogleFacebookMicrosoftBloomberg
→

Jump Game II

MediumGreedyArrayDynamic Programming
AmazonGoogleFacebookMicrosoftApple
→

Gas Station

MediumGreedyArray
AmazonGoogleFacebook
→

Hand of Straights

MediumGreedyArrayHash TableSorting
AmazonGoogleMicrosoft
→

Merge Intervals

MediumArraySortingIntervals
AmazonFacebookGoogleMicrosoftBloomberg
→

Merge Triplets to Form Target Triplet

MediumGreedyArray
AmazonGoogleFacebook
→

Insert Interval

MediumArrayIntervals
AmazonFacebookGoogleMicrosoftLinkedIn
→

Non-overlapping Intervals

MediumGreedyArraySortingIntervals
AmazonFacebookGoogleMicrosoft
→

Meeting Rooms

EasyIntervalsSortingArray
AmazonFacebookGoogleBloomberg
→

Meeting Rooms II

MediumIntervalsHeapSortingGreedy
AmazonFacebookGoogleMicrosoftBloomberg
→

Partition Labels

MediumGreedyHash TableTwo PointersString
AmazonGoogleMicrosoftFacebookBloomberg
→

Valid Parenthesis String

MediumGreedyStringStack
AmazonFacebookGoogle
→

Math & Geometry(8 problems)

Rotate Image

MediumArrayMathMatrix
AmazonMicrosoftFacebookGoogleApple
→

Spiral Matrix

MediumMatrixSimulation
AmazonMicrosoftGoogleFacebookApple
→

Set Matrix Zeroes

MediumMatrixArray
AmazonMicrosoftFacebookAppleBloomberg
→

Happy Number

Easyhash-tablemathtwo-pointers
AmazonGoogleFacebookUber
→

Pow(x, n)

MediumMathRecursionDivide and Conquer
AmazonFacebookGoogleMicrosoftBloomberg
→

Multiply Strings

MediumMathStringSimulation
FacebookAmazonGoogleMicrosoftApple
→

Plus One

Easyarraymath
GoogleAmazonFacebook
→

Detect Squares

MediumHash TableDesignCounting
AmazonGoogleFacebookMicrosoft
→

Bit Manipulation(7 problems)

Single Number

Easyarraybit-manipulation
AmazonGoogleFacebookMicrosoftApple
→

Number of 1 Bits

Easybit-manipulation
AmazonAppleFacebookGoogle
→

Counting Bits

Easybit-manipulationdynamic-programming
AmazonGoogleFacebookMicrosoft
→

Reverse Bits

Easybit-manipulation
AmazonAppleFacebook
→

Missing Number

Easyarraymathbit-manipulation
AmazonMicrosoftFacebookGoogleBloomberg
→

Reverse Integer

Mediummath
AmazonGoogleFacebookBloomberg
→

Sum of Two Integers

Mediumbit-manipulationmath
AmazonFacebookGoogleMicrosoft
→

Fundamentals(21 problems)

Fizz Buzz

Easymathsimulation
→

Palindrome Number

Easymath
AmazonGoogle
→

Add Digits

Easymath
→

Power of Two

Easymathbit-manipulation
AmazonGoogle
→

Power of Three

Easymath
AmazonGoogle
→

Power of Four

Easybit-manipulationmath
→

Ugly Number

Easymath
→

Count Primes

Mediummatharray
AmazonMicrosoftGoogle
→

Pascal's Triangle

Easyarraydynamic-programming
AmazonGoogleApple
→

Add Binary

Easystringmathbit-manipulation
AmazonFacebookGoogle
→

Reverse String

Easytwo-pointersstring
AmazonMicrosoftGoogle
→

Length of Last Word

Easystring
→

Longest Common Prefix

Easystring
AmazonGoogleFacebook
→

Excel Sheet Column Number

Easymathstring
AmazonMicrosoft
→

Roman to Integer

Easyhash-tablestringmath
AmazonMicrosoftGoogleFacebook
→

Integer to Roman

Mediumhash-tablestringmath
AmazonMicrosoftGoogle
→

First Bad Version

Easybinary-search
AmazonFacebookGoogle
→

Guess Number Higher or Lower

Easybinary-search
→

Sqrt(x)

Easybinary-searchmath
AmazonGoogleFacebookBloomberg
→

Valid Perfect Square

Easybinary-searchmath
AmazonGoogle
→

Find the Index of the First Occurrence in a String

Easystringtwo-pointers
AmazonFacebookMicrosoft
→

System Design(5 problems)

Design HashMap

Easyhash-tabledesign
AmazonGoogle
→

Design HashSet

Easyhash-tabledesign
AmazonGoogle
→

Implement Stack using Queues

Easystackdesignqueue
AmazonMicrosoftBloomberg
→

Implement Queue using Stacks

Easystackdesignqueue
AmazonMicrosoftBloomberg
→

Range Sum Query - Immutable

Easyarrayprefix-sum
AmazonGoogle
→