AlgoMaster DSA Animations

Interactive visualizations for data structures and algorithms

Array

Easy

Move Zeros

Move all zeros to end while maintaining relative order

Medium

Best Time to Buy and Sell Stock II

Find maximum profit from multiple buy and sell transactions

Two Pointers

Medium

Container with Most Water

Find two lines that form a container with maximum water capacity

Hard

Trapping Rain Water

Calculate total water trapped between elevation bars after raining

Prefix Sum

Medium

Subarray Sum Equals K

Find subarrays with sum equal to target using prefix sums

Sliding Window

Medium

Longest Substring Without Repeating Characters

Find the length of the longest substring without repeating characters

Hard

Minimum Window Substring

Find the minimum window in string that contains all characters of target

Kadane's Algorithm

Medium

Maximum Subarray

Find the contiguous subarray with the largest sum (Kadane's Algorithm)

Matrix

Medium

Spiral Matrix

Traverse matrix in spiral order from outer to inner layers

Linked List

Easy

Reverse Linked List

Reverse a singly linked list using three pointers

Medium

Remove Duplicates from Sorted List II

Remove all nodes with duplicate values from a sorted linked list

Medium

Linked List Cycle II

Detect cycle and find entry point using Floyd's algorithm

Medium

Swap Nodes in Pairs

Swap every two adjacent nodes in a linked list

Stack

Easy

Valid Parentheses

Determine if a string of brackets is properly balanced using a stack

Medium

Daily Temperatures

Find how many days until a warmer temperature using monotonic stack

Hard

Largest Rectangle in Histogram

Find the largest rectangle area in a histogram using a monotonic stack

Queue

Medium

Reveal Cards In Increasing Order

Arrange deck so cards are revealed in increasing order using queue simulation

Hard

Sliding Window Maximum

Find maximum in each sliding window using monotonic deque

Binary Search

Medium

Search in Rotated Sorted Array

Find target in rotated sorted array using modified binary search

Medium

Search in 2D Matrix

Find target in sorted 2D matrix using binary search

Backtracking

Medium

Subsets

Generate all subsets using recursive backtracking with decision tree

Medium

Permutations

Generate all permutations by choosing unused elements recursively

Tree

Medium

Binary Tree Zigzag Level Order Traversal

Traverse tree level by level in zigzag pattern using BFS and queue

Medium

Populating Next Right Pointers in Each Node II

Connect nodes at same level using BFS with queue

Medium

Path Sum III

Count downward paths that sum to target using prefix sums and DFS

Medium

Validate Binary Search Tree

Check if a binary tree satisfies BST properties using recursive DFS

Medium

Flatten Binary Tree to Linked List

Flatten tree to right-skewed linked list in-place using Morris Traversal

Hard

Binary Tree Maximum Path Sum

Find maximum path sum in tree where path can start and end at any node

BST

Medium

Trim Binary Search Tree

Trim BST to range [low, high] using recursive pruning and restructuring

Tries

Medium

Search Suggestions System

Generate product suggestions for each prefix using binary search

Hard

Word Search II

Find all words from dictionary in board using Trie and DFS backtracking

Heap

Medium

Furthest Building You Can Reach

Find furthest building reachable with bricks and ladders using min-heap

Hard

IPO

Maximize capital by selecting k most profitable projects using max-heap

Medium

K Closest Points to Origin

Find k closest points to origin using max-heap to track distances

Intervals

Medium

Merge Intervals

Merge all overlapping intervals on a timeline

Medium

Minimum Number of Arrows to Burst Balloons

Find minimum arrows needed to burst all balloons using greedy algorithm

Medium

Kth Smallest Element in Sorted Matrix

Find kth smallest element using binary search on value range

Greedy

Medium

Jump Game II

Find minimum jumps to reach the end using greedy BFS approach

Medium

Gas Station

Find starting gas station to complete circular route using greedy algorithm

Graph

Medium

Number of Islands

Count separate islands in a 2D grid using BFS flood-fill

Medium

All Nodes Distance K in Binary Tree

Find all nodes exactly K edges away from target using BFS with parent links

Medium

Rotting Oranges

Find minimum time for all oranges to rot using multi-source BFS

Hard

Word Ladder

Find shortest word transformation sequence using BFS

Medium

Course Schedule II

Find valid course order using DFS topological sort on prerequisite graph

Medium

Number of Provinces

Count connected components in adjacency matrix using DFS

Dynamic Programming

Medium

House Robber II

Find maximum money to rob from houses in a circle using dynamic programming

Medium

Longest Common Subsequence

Find length of longest subsequence common to both strings using dynamic programming

Medium

Coin Change II

Count number of ways to make amount using coins with dynamic programming

Medium

Minimum Path Sum

Find path with minimum sum from top-left to bottom-right in grid

49 of 49 algorithms visualized