Sorting

• Conditional Statements in DSA
• For Loop
• While Loop
• Functions
• Classes and Objects in DSA
• Order of Growth
• Asymptotic Analysis
• Big-O Notation
• Theta Notation
• Big-Omega Notation
• Time Complexity
• Space Complexity
• Input and Output

All 13 lessons →

• Recursion
• Analysis of Recursion
• Even or Odd
• Sum of Natural Numbers
• Closest Number
• Sum of Consecutive Numbers
• Solid Rectangle
• Floyd's Triangle
• Hollow Rectangle
• Print 1 to N
• Print N to 1
• Factorial
• GCD
• Power
• Pyramid
• Hollow Diamond
• Count Digits
• Prime Testing
• Armstrong Number
• Trailing Zeros
• Prime Factors
• All Divisors
• Butterfly Pattern
• Palindrome Number
• Tower of Hanoi
• Non-Attacking Knights
• Josephus Problem
• Water Jug Problem

All 28 lessons →

• Array Basics
• String Basics
• Matrix Basics
• Is Sorted
• Multiply with Adjacent
• Reverse Array
• Reverse in Groups
• Rotate Array
• Generate All Subarrays
• Arrange by Sign
• Stock Buy/Sell - One Transaction
• Stock Buy/Sell - Multiple Transactions
• Leaders in Array
• Same Strings
• Palindrome String
• Toggle Case
• Remove Occurrences
• Remove Spaces
• Check Subsequence
• First Non-Repeating Character
• Pangram
• Majority Element
• Majority Element II
• Sorted Subsequence of 3
• Count Strictly Increasing Subarrays
• Next Permutation
• Kadane's Algorithm
• Sum of All Subarrays
• Maximum Product Subarray
• Implement atoi
• URLify
• Multiply Large Numbers
• Diagonal Traversal
• Magic Square
• Boundary Traversal
• Spiral Matrix
• Toeplitz Matrix
• Matrix Zig-Zag
• Transpose of Matrix
• Rotate Matrix by 90 Degrees
• Conway's Game of Life
• Queries in a Matrix
• Set Matrix Zeroes
• Maximum Circular Subarray Sum
• Next Smallest Palindrome
• Lexicographic Rank
• Text Justification

All 47 lessons →

• Linked List Basics
• Singly Linked List
• Doubly Linked List
• Circular Linked List
• Reverse Singly Linked List
• Reverse Doubly Linked List
• Reverse in Groups
• Reorder List
• Find Middle
• Remove Nth From End
• Check Palindrome
• Detect Cycle
• Intersection of Y-Shaped Lists
• Sort 0s 1s 2s
• Add Two Numbers
• Merge K Sorted Lists
• Browser History
• Twitter Design
• LRU Cache
• LFU Cache
• Flatten Linked List
• Clone Linked List With Random Pointer

All 22 lessons →

• Stack Basics
• Reverse Stack
• Sort Stack
• Balanced Parentheses
• Postfix Evaluation
• Infix Evaluation
• Infix to Postfix
• Redundant Brackets
• Longest Valid Parentheses
• Stack Using Queues
• Two Stacks in an Array
• K Stacks in an Array
• Stack With getMin
• Remove K Digits
• Next Greater Element
• Stock Span Problem
• Previous Smaller Element
• Largest Rectangle in Histogram
• Trapping Rain Water
• Decode String

All 20 lessons →

• Queue Basics
• Circular Queue
• Queue Using Stacks
• FIFO Page Replacement
• Reverse a Queue
• Reverse First K Elements
• Interleave Queue
• K Queues in an Array
• First Non-Repeating Character in a Stream
• Minimum Knight Steps

All 10 lessons →

• Deque Basics
• Circular Array Implementation
• Lexicographically Largest Permutation
• Generate Bitonic Sequence
• Sliding Window Maximum
• Longest Subarray With Difference <= X
• Minimum Deques to Sort Array

All 7 lessons →

• Hashing Basics
• Linear Probing
• Separate Chaining
• Quadratic Probing
• Distinct in Array
• Is Subset
• Union of Arrays
• Intersection of Arrays
• Two Sum
• Fizz Buzz
• Pair Sums Divisible by K
• Roman to Integer
• Isomorphic Strings
• Count Frequencies
• Most Frequent Element
• Maximum Subsets
• Anagrams
• Longest Consecutive Subsequence
• Consecutive Subsequence

All 19 lessons →

• Heap Basics
• Check for Heap
• Heap Sort
• Kth Largest
• K Largest Elements
• Height of Heap
• Connect N Ropes
• Nearly Sorted Array
• BST to Min Heap
• K Max Sum Combinations
• Median in a Stream
• Kth Largest in a Stream
• Merge K Sorted Arrays/Lists
• Range Covering K Sorted Lists
• Skyline Problem
• Sort by Frequency

All 16 lessons →

• Binary Tree Basics
• Inorder Traversal
• Preorder Traversal
• Postorder Traversal
• Level Order Traversal
• Size of Tree
• Depth of Tree
• Maximum Width
• Check Balanced Tree
• Identical Trees
• Mirror Tree
• Sum Tree
• Left View
• Right View
• Path Sum
• Maximum Path Sum
• Serialize and Deserialize
• Iterative Inorder
• Iterative Preorder
• Iterative Postorder
• Morris Inorder
• Diameter of Tree
• Boundary Traversal
• Tree From Preorder and Inorder
• Connect Nodes at Same Level
• Invert Tree
• Flatten Tree
• Vertical Traversal
• Bottom View
• Top View
• Spiral Level Order
• Lowest Common Ancestor
• Distance K
• Subtree Check

All 34 lessons →

• BST Basics
• Search in BST
• Insert in BST
• Delete in BST
• Ceil in BST
• Floor in BST
• Predecessor and Successor
• Kth Smallest Element
• Two Sum in BST
• Sorted Array to BST
• Merge Two BSTs
• Validate BST
• Lowest Common Ancestor
• Recover BST
• Largest BST Subtree

All 15 lessons →

• Implement Trie
• Longest Word With All Prefixes
• Count Distinct Substrings
• Maximum XOR of Two Numbers
• Maximum XOR Queries
• Pairs With XOR Less Than K
• Search Suggestions System
• Palindrome Pairs

All 8 lessons →

• Graph Representation
• BFS Traversal
• DFS Traversal
• Flood Fill
• Number of Islands
• Connected Components in Undirected Graph
• Cycle in Undirected Graph
• Cycle in Directed Graph
• Bipartite Graph
• Rotten Oranges
• Topological Sort
• Course Schedule I
• Course Schedule II
• Alien Dictionary
• Dijkstra's Algorithm
• Floyd Warshall
• Bellman-Ford
• Minimum Cost Path
• Shortest Cycle in Undirected Graph
• Distance of Nearest 1
• Word Ladder
• Prim's Algorithm
• Disjoint Set Union
• Kruskal's Algorithm
• Detect Cycle Using DSU
• Number of Connected Components

All 26 lessons →

• Two-Pointer Technique
• Two Sum in Sorted Array
• Smallest Subarray
• Unique Elements
• Sentence Palindrome
• Three Sum
• Celebrity Problem
• Closest Pair from Two Arrays
• Container With Most Water
• Common Elements in Three Arrays
• Reverse Words
• Four Sum
• Closest Triplet
• Count Triplets

All 14 lessons →

• Sliding Window Technique
• Maximum Sum Subarray of Size K
• Maximum XOR of K Size
• Distinct in Every Window
• MEX of Subarrays
• Minimum Swaps to Group All 1s
• First Negative in Every Window
• Chocolate Distribution
• Maximize Ones
• Equal Substring With Cost <= K
• Fruit Into Baskets
• Subarray With Given Sum
• Smallest Subarray With Sum Greater Than X
• Minimum Window Subsequence
• Minimum Window Substring
• Subarrays With K Odds
• Subarrays Less Than K
• Longest Substring With Distinct Characters
• Longest Substring With K Unique Characters
• Count Anagrams

All 20 lessons →

• Prefix Sum Basics
• Prefix Sum Array
• 2D Prefix Sum
• Range Queries
• Equilibrium Index
• Product of Array Except Self
• Difference Array
• 2D Difference Array
• Subarray With Zero Sum
• Largest Subarray With Zero Sum
• Largest Subarray With Equal 0s and 1s
• Longest Subarray With Sum K
• Count Subarrays With Sum K
• Count Subarrays With Given XOR

All 14 lessons →

• Bit Manipulation Basics
• Swap Without Third Variable
• Kth Set Bit
• Only Set Bit
• Power of Two
• Sort by Set Bits
• Power of Four
• Binary Palindrome
• Rotate Bits
• Swap Odd and Even Bits
• Count Set Bits
• Count Total Set Bits
• Maximum Consecutive 1s
• Missing Number
• One Odd Occurring
• Two Odd Occurring
• Missing and Repeating
• Unique Numbers II
• Gray Codes
• Hamming Distance
• Sum of Pair XORs
• Sum of Subset XORs
• Subarray XORs
• Subsets
• Subsequences

All 25 lessons →

• Backtracking Basics
• Permutations
• Rat in a Maze
• Word Search
• N-Queen Problem
• Sudoku Solver
• Word Break
• Knight's Tour
• Palindromic Partitions
• M-Coloring

All 10 lessons →

• Greedy Algorithm Basics
• Fractional Knapsack
• Assign Cookies
• Smallest Subset With Greater Sum
• Minimum Notes With Given Sum
• Activity Selection
• Huffman Coding
• Jump Game
• Job Sequencing
• Non-Overlapping Intervals
• Gas Station
• Stable Marriage
• Minimize Maximum Height Difference
• No Two Adjacent Same
• Minimize Cash Flow
• Min Time to Finish Jobs With Constraints

All 16 lessons →

• Searching Basics
• Largest Element
• Second Largest
• Local Min and Max
• Search Insert Position
• Lower Bound
• Upper Bound
• Single Element in Sorted Array
• Missing Natural Number
• Count Occurrences
• Search in 2D Matrix
• Search in Sorted and Rotated Array
• Search in Sorted and Rotated Array II
• K Closest Elements
• Search in Almost Sorted Array
• Peak Element
• Peak Element in 2D
• Range Based Counts
• Kth Missing Positive
• Search in Row-Column Sorted Matrix
• Square Root
• Nth Root
• Check Power
• Book Allocation
• Koko Eating Bananas
• Aggressive Cows
• Median in Row Sorted Matrix
• Kth Smallest in Row and Column Sorted Matrix
• M Bouquets
• Kth in Multiplication Table
• Median of Two Sorted Arrays
• Kth Element of Two Sorted Arrays

All 32 lessons →

• Sorting Basics
• Wave Form
• Sort by Length
• Minimum Difference Pair
• Merge Overlapping Intervals
• Form Largest Number
• Meeting Rooms
• Insert and Merge Intervals
• Minimize Moves
• Quick Sort
• Sort Binary Array
• Move Zeroes to End
• Sort Ternary Array
• Merge Sort
• Union of Two Sorted Arrays
• Intersection of Two Sorted Arrays
• Merge Without Extra Space
• Minimum Platforms
• Inversion Count
• Cycle Sort
• Minimum Missing Positive
• Minimum Swaps to Sort

All 22 lessons →

• Dynamic Programming Basics
• Climbing Stairs
• Count Without Consecutive 1s
• Frog Jump
• House Robber
• Maximum Segments
• Coin Change
• Decode Ways
• Word Break
• Unique Paths
• Minimum Cost Path
• Longest Common Subsequence
• Edit Distance
• Distinct Subsequences
• Largest Square Submatrix of 1s
• Partition Equal Subset Sum
• Subset Sum
• Count Subsets With Given Sum
• Target Sum
• 0/1 Knapsack
• Coin Change II
• Rod Cutting
• Unique Paths in a Grid
• Maximum Path Sum in Matrix
• Longest Increasing Path
• Longest Common Substring
• Shortest Common Supersequence
• Interleaving String
• Wildcard Matching
• Longest Palindromic Substring
• Buy/Sell With Cooldown
• Buy/Sell With At Most Two Transactions
• Buy/Sell With K Transactions
• Buy/Sell With Transaction Fee
• Longest Increasing Subsequence
• Number of LIS
• Longest Bitonic Subsequence
• Longest String Chain
• Matrix Chain Multiplication
• Minimum Cost to Cut a Stick
• Palindrome Partitioning
• Boolean Parenthesization
• Partition Array for Maximum Sum
• Egg Dropping

All 44 lessons →

• Substring Search
• Rabin-Karp
• KMP Algorithm
• Z Algorithm
• Longest Prefix Suffix
• Manacher's Algorithm
• Longest Palindromic Substring
• Palindrome Substring Queries
• Minimum Repeats for Substring

All 9 lessons →

• nCr
• Euler's Totient
• Sieve of Eratosthenes
• Pascal's Triangle
• Modular Exponentiation
• Segmented Sieve

All 6 lessons →

• Segment Tree
• Min-Max Range Queries
• Range LCM Queries
• Range XOR Queries
• Lazy Propagation
• Flipping Sign
• Segment Tree on N-ary Rooted Tree
• Fenwick Tree
• Sum and Update Queries on 3D Matrix

All 9 lessons →