Course Content
Data Structures & Algorithms
Number Theory
0/19
Number of Common Factors
Add Two Integers
Product of factors of number
Repeating GCD
Sieve of Eratosthenes
Exponentiation
Factorial
GCD & LCM
Prime Numbers and Primality Check
Sieve of Eratosthenes
Binary Exponentiation
Modulo Arithmetic
Inverse Modulo
nCr Computations using inverse modulo
Find all factorial numbers less than or equal to N
GCD, LCM and Distributive Property
Product of Prime Factors
Find Prime numbers in a range
HackerRank Test
Math
0/15
Plus One
Sqrt(x)
Power of Four
Excel Sheet Column Title
Reverse Integer
Factorial Trailing Zeroes
Fibonacci Number
Palindrome Number
Check If It Is a Straight Line
Count Days Spent Together
Minimum Sum of Four Digit Number After Splitting Digits
Day of the Year
Subtract the Product and Sum of Digits of an Integer
Prime Arrangements
HackerRank Test
Bit Manipulation
0/14
Single Number
XOR Operation in an Array
Sum of All Subset XOR totals
Convert a number to hexadecimal
Prime Number of Set Bits in Binary Representation
Maximum XOR of Two Numbers in an Array
XOR Queries of a Subarray
Total Hamming Distance
Single Number II
Find Sum Of Different Corresponding Bits For All Pairs
Divide Two Integers
Bitwise ORs of Subarrays
Bit Manipulation Quiz
HackerRank Test
Searching (Beginner)
0/16
sqrt(x)
Binary Search
Intersection of Two Array II
Count Negative Numbers in a Sorted Matrix
Check if Array is Sorted and Rotated
Rotate String
Find Peak Element
Single Element in a Sorted Array
Minimum Swaps to Sort
Matrix Median
Search in Rotated Sorted Array
Minimum Size Subarray Sum
Maximum Height Of The Staircase
Median Of Two Sorted Arrays
Searching Quiz
HackerRank Test
Searching (Advanced)
0/13
Reach a Number
Most Profit Assigning Work
Ways to Split Array Into Three Subarrays
Plates between Candles
Aggressive Cows
Smallest Good Base
Allocate Books
Nth Magical Number
Painters Partition Problem
Matrix Search
Rotate Image
Find Minimum In Rotated Sorted Array
HackerRank Test
Recursion
0/15
Fibonacci Number
Power of Four
Merge Two Sorted Lists
Power of Two
All Unique Permutations
Combination Sum
Permutations
Subsets
Combination Sum ii
Gray Code
Subsets ii
Permutation Sequence
Find the Winner of the Circular Game
Recursion Quiz
HackerRank Test
Backtracking
0/14
Sum of All Subset XOR Totals
Binary Watch
Letter Tile Possibilities
Generate Parantheses
Unique Paths III
NQueens
Permutations II
Number Of Squareful Arrays
Palindrome Partitioning
Gray Code
N-Queens II
Numbers With Same Consecutive Differences
Backtracking Quiz
HackerRank Test
Sorting (Beginner)
0/14
Third Largest Number
Sort Array By Parity II
How Many Numbers are smaller than the current Number?
Fair Candy Swap
K Closest Points to Origin
Maximum Difference
Maximum Difference Between Increasing Elements
Number of sextuplets
Corporate Flight Bookings
Chocolate Distribution Problem
Sum Special Triplets Elements 3 Arrays
Find Right Interval
Sorting Algorithms Quiz
HackerRank Test
Sorting (Advanced)
0/13
Find the Distance value between Two Arrays
Merge Similar items
Split with Minimum Sum
Sort Even and Odd Indices Independently
Count of smaller numbers after self
Count of Range Sum
Reverse pairs
Lexicographically largest permutation of the array such that a[i] = a[i-1] + gcd(a[i-1], a[i-2])
Possible Arrangement Of Persons Waiting To Sit In A Hall
Inversion count in an array
Max Chunks To Make Sorted II
Reducing Dishes
HackerRank Test
Two Pointer
0/15
Find the Index of the First Occurrence in a String
Is Subsequence?
Check if N and its Double exist
Squares of a Sorted Array
Count of pairs with the given sum
Minimum Size Subarray Sum
Minimize the absolute difference
Smallest sequence with given Primes
Container With Most Water
Given Two Sorted Arrays Number X Find Pair Whose Sum Closest X
Counting Triangles
Trapping Rain Water
Longest Chunked Palindrome Decomposition
Two-Pointer Approach Quiz
HackerRank Test
Hashing (Beginner)
0/14
Two Sum
Find the Difference
Fair Candy Swap
Maximum Number of Ballons
Subarray with 0 sum
Subarray Sum Equals K
Largest Continuous Sequence Zero Sum
Longest Consecutive Sequence
Equal
Anagrams
Valid Sudoku
00:00
Set Matrix Zeros
Find Pairs In Array Whose Sums Already Exist In Array
Hashing Quiz
Hashing (Advanced)
0/14
Check if N and its Double exist
How many Numbers are Smaller than the current number
Sum of Unique Elements
Decode the Message
Palindrome Pairs
Window String
Longest Substring Without Repeat
Points on same line
Count Right Triangles
Diffk ii
Grid Illumination
Find rectangle with corners as 1
Random Pick with Blacklist
HackerRank Test
Strings
0/15
Repeated Substring Pattern
Valid Palindrome II
Find Common characters
Check if a word occurs as a Prefix of any word in a sentence
Day of the Year
Longest Common Prefix
Compare Version Numbers
Compare Version Numbers
Reverse the String
Implement Strstr
Integer To Roman
Roman To Integer
Pretty Json
String Operations Quiz
HackerRank Test
Stacks
0/14
Valid Parentheses
Next Greater Element I
Number of Students unable to eat Lunch
Remove all Adjacent Duplicates in String
Evaluate Expression
Min Stack
Largest Rectangle in Histogram
Trapping Rain Water
Nearest Smaller Element
Brace Expansion II
Maximal Rectangle
Stack Operations Quiz
Stack Operations Quiz
HackerRank Test
Queues
0/14
Implement Stack using Queues
First Unique Character in a String
Implement Queue using Stacks
Time needed to Buy Tickets
Sum of min and max
Reversing the first K elements of a Queue
N integers containing only 1, 2 & 3
Gas Station
Sliding Window Maximum
Given A String Find Its First Non Repeating Character
Max Value of Equation
Shortest Subarray with Sum at Least K
Queues Quiz
HackerRank Test
Linked List (Beginner)
0/10
Merge Two Sorted Lists
Palindrome Linked List
Intersection of Two Linked Lists
Middle of the Linked List
Remove Nth Node From End of List
List Cycle
Reverse Linked List Ii
Populating Next Right Pointers in Each Node
Linked List Quiz
HackerRank Test
Linked List (Advanced)
0/12
Design Hashmap
Remove Duplicates from Sorted List
Linked List Cycle
Merge Two Sorted Lists
Flatten a Multilevel Doubly Linked List
Clone a Linked List
Intersection of Linked Lists
Remove Duplicates From Sorted List ii
Remove Duplicates From Sorted List
Length Longest Palindrome List Linked List Using O(1) Extra Space
Design a Text Editor
Linked List Quiz 2
Trees (Beginner)
0/13
Same Tree
Maximum Depth of Binary Tree
Binary Tree Inorder Traversal
Binary Tree Preorder Traversal
Binary Tree Postorder Traversal
Binary Tree From Inorder And Postorder
Balanced Binary Tree
Check Tree Traversal
Binary Tree Zigzag Level Order Traversal
Construct Binary Tree From Preorder And Inorder Traversal
Binary Tree Level Order Traversal
Populating Next Right Pointers in Each Node
HackerRank Test
Trees (Intermediate)
0/12
Symmetric Tree
Invert Binary Tree
Binary Tree Tilt
Evaluate Boolean Binary Tree
Vertical Order traversal
Binary Tree Right Side View
Sum Tree
2-Sum Binary Tree
TOP VIEW
Boundary Traversal Of Binary Tree
Add One Row to Tree
Serialize and Deserialize Binary Tree
Trees & BST
0/18
Convert Sorted Array to BST
Find Mode in BST
Minimum Absolute difference in BST
Two Sum IV – Input is a BST
Search in a BST
Kth Largest Element in a Stream
Recover Binary Search Tree
Sorted Array To Balanced BST
BST Iterator
Left view of binary tree
Least Common Ancestor
Invert the Binary Tree
Valid Binary Search Tree
Binary Tree to CDLL
Sum Root To Leaf Numbers
Symmetric Binary Tree
Identical Binary Trees
Path Sum
BST (Advanced)
0/11
Minimum Distance between BST nodes
Increasing order BST
Range Sum of BST
Leaf nodes from Preorder of a Binary Search Tree
Odd even level difference
Minimum Distance between Nodes of BST
Boundary Traversal Of Binary Tree
2sum Binary Tree
Binary Tree Paths
All Nodes Distance K In Binary Tree
Binary Search Tree (BST) Quiz
Heap
0/14
Take Gifts from the Richest Pile
Delete greatest value in each row
Make Array zero by Subtracting equal amounts
Minimum amount of time to fill cups
N max pair combinations
Kth Largest Element in an Array
Merge k Sorted Lists
B Closest Points to Origin
Ways To Form Max Heap
Kth Largest Element In An Array
Magician And Chocolates
Sliding Window Median
Binary Heap Quiz
HackerRank Test
Greedy
0/14
Largest Perimeter Triangle
Longest Palindrome
Maximum Sum with exactly K elements
Minimum Moves to convert string
Maximize Sum Of Array After K Negations
Assign Mice to Holes
Seats
Meeting rooms
Job Sequencing Problem
Task Scheduler
Kth Smallest Element In A Sorted Matrix
Minimum Number of Refueling Stops
Reducing Dishes
Greedy Algorithm Quiz
Dynamic Programming (Beginner)
0/13
Pascal’s Triangle
Best time to Buy and Sell Stock
Fibbonacci Number
Best Time to Buy and Sell Stock II
House Robber
Climbing Stairs
Length of Longest Fibonacci Subsequence
Min Jumps Array
Coins in a Line
Longest Increasing Subsequence
Tiling A Rectangle With The Fewest Squares
Max Sum Without Adjacent Elements
Dynamic Programming Quiz
Dynamic Programming (Intermediate)
0/14
Pascal’s Triangle II
Counting Bits
Is Subsequence?
Perfect Squares
Minimum cost for tickets
Min Sum Path in Matrix
Longest Palindromic Subsequence
Longest Common Subsequence
Longest Increasing Subsequence
Unique Paths In A Grid
Coin Sum Infinite
Coins In A Line
Regular Expression Matching
Dynamic Programming Concepts
Dynamic Programming (Advanced)
0/27
Divisor Game
N-th Tribonacci Number
Get Maximum in Generated Array
Predict the Winner
Maximum length of Pair Chain
Longest String chain
Minimum Time to make Rope colorful
Nth Fibbonacci Number
Get Maximum in Generated Array
Divisor Game
Edit Distance
Word Break
Regular Expression Matching
Regular Expression ii
Interleaving String
Palindrome Partitioning II
Longest Palindromic Substring
Matrix chain multiplication
Unique Binary Search Trees ii
Tushars Birthday Party
Distinct Subsequences
Evaluate Expression To True
Russian Doll Envelopes
Word Break II
Palindrome Partitioning II
Word Break
Stock Trading Dynamic Programming Problems
Graph (Beginner)
0/14
Find if Path exists in Graph
Find Center of Star Graph
Island Perimeter
Minimum Depth of Binary Tree
Rotting Oranges
Capture Regions on Board
Black Shapes
Frog Position After T Seconds
Smallest Multiple With 0 And 1
Number Of Islands
Jump Game IV
Shortest Path Visiting All Nodes
Graph Theory Concepts
Graph Types and Algorithms
Graph (Advanced)
0/12
Min Cost to Connect All points
Find All Possible recipes from Given Supplies
All Ancestos of a Node in a Directed Acyclic Graph
Number of Provinces
Possibility of finishing all courses given pre-requisites
Commutable Islands
Knight On Chess Board
Dijkstra
Word Ladder I
Word Ladder II
Is Graph Bipartite?
Graph Algorithms
Trie
0/6
Longest Common Prefix
Shortest Unique Prefix
Maximum XOR of Two Numbers in an Array
Subarrays Xor Less Than B
Distinct Echo Substrings
Concatenated Words
Segment Tree
0/5
Good Ranges
Falling Squares
Bob and Queries
Number of Longest Increasing Subsequence
Range Frequency Queries
Low Level System Design
Low Level Design (Basic Building Blocks)
0/5
Inheritence
Association
Composition
Aggregation
LLD Quiz
Solid Principles
0/6
Single Responsibility Principle
Open closed Principle
Dependency Inversion Principle
Liskov’s substitution Principle
Interface Segregation Principle
SOLID Principles Quiz
Creational Design Patterns
0/5
Factory
Abstract Factory
Builder
Singleton
Creational Design Quiz
Structural Design Patterns
0/5
Decorator
Facade
Adapter
Bridge
Structural Design Quiz
Behavioural Design Patterns
0/5
Command
Observer
State
Strategy
Behavioural Design Quiz
LLD Topics
Pizza factory
0/7
Requirements
Identification of actors
Use case diagram
Class diagram
QnA
⁠Activity Diagram
Code
SQL Query builder
0/7
Requirements
⁠Identification of actors
Use case diagram
Class diagram
QnA
⁠Activity Diagram
Code
Logger
0/11
Introduction & Class Diagram
03:03
Code Part 01
10:45
Singleton Logger
02:39
Code Part 02
02:01
Requirements
⁠Identification of actors
⁠Use case diagram
Class diagram
QnA
Activity Diagram
Code
Car Price Calculator
0/12
Car Price Calculator LLD Chapter 1
00:00
Car Price Calculator LLD Chapter 2
00:00
Car Price Calculator LLD Chapter 3
00:00
Car Price Calculator LLD Chapter 4
00:00
Car Price Calculator LLD Chapter 5
00:00
Requirements
Identification of actors
⁠Use case diagram
Class Diagram
QnA
Activity Diagram
Code
Weather Station
0/7
Requirements
⁠Identification of actors
Use case diagram
Class diagram
QnA
Activity Diagram
Code
Ticket management system
0/7
Requirements
⁠Identification of actors
⁠Use case diagram
Class diagram
QnA
Activity Diagram
Code
Payment processor
0/11
Payment Processor LLD Chapter 1
02:47
Payment Processor LLD Chapter 2
03:49
Payment Processor LLD Chapter 3
06:51
Payment Processor LLD Chapter 4
00:00
Requirements
Identification of actors
Use case diagram
Class diagram
QnA
Activity Diagram
Code
Elevator System
0/7
Requirements
⁠Identification of actors
Use case diagram
⁠Class diagram
QnA
Activity Diagram
Code
Car parking
0/20
Introduction Video
00:55
Use Case Diagram
03:44
Class Diagram
06:07
Class Diagram continued
05:30
Services
09:57
Parking Service
07:59
Discussion on Parking Spots and Parking Service
08:13
Activity Diagram
00:00
Coding Part 1
34:45
How to add Logging in the system
00:00
Coding Part 2 (Adding Logging in the system)
00:00
Implementing Parking pots using Decorator Design pattern
02:35
Coding Part 3
00:00
Requirements
⁠Identification of actors
Use case diagram
Class diagram
⁠QnA
⁠Activity Diagram
Code
Social media
0/7
Requirements
⁠Identification of actors
Use case diagram
⁠Class diagram
QnA
Activity Diagram
Code
WhatsApp
0/7
Requirements
⁠Identification of actors
00:00
⁠Use case diagram
00:00
Class diagram
QnA
Activity Diagram
Code
Amazon
0/7
Requirements
Identification of actors
Use case diagram
Class diagram
QnA
⁠Activity Diagram
Code
PayPal
0/8
Introduction to Paypal
Requirements
⁠Identification of actors
Use case diagram
Class diagram
⁠QnA
Activity Diagram
Code
Assignment
0/2
Design Patterns
Snakes and Ladders Game Implementation
High Level Design
High Level Design ( Building Blocks )
0/11
What is HLD?
Consistent Hashing
Caching
Load Balancing
CAP Theorem
Indexes
Redundancy and Replication
SQL vs NoSQL
Data Partitioning
Long Polling and WebSockets
Quorum
TinyURL
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High-Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Rate Limiter
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Typeahead suggestion (Google queries)
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Pastebin
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
DropBox
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Instagram
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Messenger
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
BookMyShow
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Uber/Ola
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Newsfeed
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
Youtube/Netflix
0/10
Introduction
Requirements & Goals of the System
Capacity Estimations & Constraints
System APIs
Database design & Schema
High Level Design
QnA
Purging & Db Cleanup
Database Partitioning & Replication
Cache & Load Balancing
DSA, High & Low Level System Designs

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