HackerRank Test - Get SDE Ready

Factorial Trailing Zeroes

Math

0/15

Plus One

Sqrt(x)

Power of Four

Excel Sheet Column Title

Reverse Integer

Palindrome Number

Fibonacci 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

XOR Operation in an Array

Bit Manipulation

0/15

Single Number

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

Single Number iii

Bitwise ORs of Subarrays

Bit Manipulation Quiz

Intersection of Two Array II

Searching (Beginner)

0/17

sqrt(x)

Binary Search

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

Search in Rotated Sorted Array II

Searching Quiz

Most Profit Assigning Work

Searching (Advanced)

0/14

Reach a Number

Ways to Split Array Into Three Subarrays

Plates between Candles

Painters Partition Problem

Square Root

Matrix Search

Rotate Image

Find Minimum In Rotated Sorted Array

Find the Winner of the Circular Game

Recursion

0/15

Fibonacci Number

Power of Four

Merge Two Sorted Lists

Power of Two

All Unique Permutations

Recursion Quiz

Sum of All Subset XOR Totals

Backtracking

0/13

Binary Watch

Letter Tile Possibilities

Number Of Squareful Arrays

Palindrome Partitioning

N-Queens II

Numbers With Same Consecutive Differences

Backtracking Quiz

How Many Numbers are smaller than the current Number?

Sorting (Beginner)

0/13

Third Largest Number

Sort Array By Parity II

Fair Candy Swap

K Closest Points to Origin

Maximum Difference

Maximum Difference Between Increasing Elements

Number of sextuplets

Chocolate Distribution Problem

Sum Special Triplets Elements 3 Arrays

Find Right Interval

Sorting Algorithms Quiz

Find the Distance value between Two Arrays

Sorting (Advanced)

0/13

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

Find the Index of the First Occurrence in a String

Two Pointer

0/15

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

Maximum Number of Ballons

Hashing (Beginner)

0/14

Two Sum

Find the Difference

Fair Candy Swap

Subarray with 0 sum

Subarray Sum Equals K

Largest Continuous Sequence Zero Sum

Longest Consecutive Sequence

Find Pairs In Array Whose Sums Already Exist In Array

Hashing Quiz

Hashing (Advanced)

0/13

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

Diffk ii

Grid Illumination

Find rectangle with corners as 1

Random Pick with Blacklist

Repeated Substring Pattern

Strings

0/14

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

String Operations Quiz

Number of Students unable to eat Lunch

Stacks

0/13

Valid Parentheses

Next Greater Element I

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

Implement Stack using Queues

Queues

0/14

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

Intersection of Two Linked Lists

Linked List (Beginner)

0/10

Merge Two Sorted Lists

Palindrome Linked List

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

Remove Duplicates from Sorted List

Linked List (Advanced)

0/12

Design Hashmap

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)

0/12

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

Populating Next Right Pointers in Each Node

Evaluate Boolean Binary Tree

Trees (Intermediate)

0/12

Symmetric Tree

Invert Binary Tree

Binary Tree Tilt

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

Largest Perimeter Triangle

Greedy

0/14

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

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)

0/21

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

Edit Distance

Regular Expression ii

Interleaving String

Palindrome Partitioning II

Word Break

Longest Palindromic Substring

Unique Binary Search Trees ii

Matrix chain multiplication

Tushars Birthday Party

Distinct Subsequences

Evaluate Expression To True

Russian Doll Envelopes

Word Break II

Stock Trading Dynamic Programming Problems

Graph (Beginner)

0/14

Find if Path exists in Graph

Find Center of Star Graph

Island Perimeter

Rotting Oranges

Minimum Depth of Binary Tree

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

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

Full Stack Web Development

Full-Stack Web Development ( Introduction to Web Development)

0/5

Internet Basics

Understanding Client-Server Architecture

Overview of Web Development

What happens when you visit a webpage

Setting up a Development Environment

HTML (HyperText Markup Language)

0/33

HTML Basics (What, why and how)

What are HTML Tags?

HTML Tags and Elements

div

span

label

Heading (h1, h2, h3, h4, h5, h6)

br tag

hr tag

Attributes (name, id, class, style)

Anchor tag (a)

Ordered list and type (ol)

Unordered list (ul)

List items

Displaying Images (img)

Displaying Videos (video)

Embedding another website or its portion into your page (iframe)

Creating Tables (table, thead, th, tr, td, tbody, tfooter)

Creating Forms (form)

Filling forms with inputs

Inline and Block elements (div VS span and more)

Semantic and non semantic tags (header, footer, etc / div, p, etc)

Importing/including content from other sources using link, script

HTML5 Features

Table exercise: Homework

Design this HTML Page: Homework

CSS (Cascading Style Sheets) Basics

0/19

CSS Basics

Different ways to write CSS: class

Different ways to write CSS: id

Different ways to write CSS: inline

Units: px vs em vs rem

Revive this dead HTML Page: Homework

CSS Advanced

0/15

Transitions

Transformations

Transformations: translate

Transformations: scale

Transformations: rotate

Transformations: skew

Animations

The Flexbox!

Responsive Design with Media Queries

CSS Preprocessors

CSS Frameworks

CSS Frameworks: Bootstrap

CSS Frameworks: Tailwind CSS

CSS Best Practices

Creating these transforms: Homework

Getting started with JavaScript (JS)

0/3

Introduction and history of JavaScript

Where to start from and experiment

Which IDEs to use for optimal productivity

Fundamentals of JavaScript

0/3

Basic JS syntax

Data types

Variables: let, const and var

Stepping up with JavaScript

0/15

Basic JS syntax and data types

Control flow (if statements, loops)

Functions: Legacy

Functions: arrow

Functions: function expression

Functions: IIFE

Arrays

Arrays: common methods (length, slice, splice, concat, reverse)

Arrays: map, reduce and filter

Objects

Objects: Deep copy

Objects: Shallow copy

Destructuring

Maps and Sets

ES6 features (let/const vs var, arrow functions, promises, async/await)

Understanding and playing with DOM (Document Object Model)

0/2

Introduction to DOM

DOM manipulation (Dynamically changing the UI)

Event listeners in JS

0/6

Event handling (onclick)

Event handling (onsubmit)

Event handling (onmouseover)

addEventListener

Event bubbling

Event capturing

Fetching data in JS

0/3

AJAX and Fetch API

Sending and receiving payload

HTTP headers

Timing Events in JS

0/4

setTimeout

setInterval

Invoke an alert box after 3 seconds: Homework

Create seconds counter with play and pause functionality: Homework

Advanced JavaScript

0/10

Closures

Callbacks and Promises

Higher Order Functions

Asynchronous JavaScript

Modules and import/export

Creating the TODO App: Homework

JS Project

0/2

Weather App

Ticket Management Application

Frontend with React

0/34

Introduction to React

SPAs vs MPAs

How react works?

JSX and Rendering Elements

Components and Props

State and Lifecycle Methods

React Hooks!

React Hooks: useEffect

React Hooks: useState

React Hooks: useMemo

React Hooks: useCallback

React Hooks: useRef

Make custom hooks

Handling Events

Conditional Rendering

Lists and Keys

Forms in React

Lifting State Up

Composition vs Inheritance

React Router

ContextAPI vs Redux

ContextAPI for State Management

Redux for State Management

Connecting React with Express

Adding libraries to your React App!

Axios for API calls

Styled components

Recreating a TODO App: Homework

Add redux to the TODO app: Homework

Styling with React

0/5

Styled components: dynamic styling

Component Lifecycle in React

0/5

What is Component Lifecycle?

Introduction to Node.js

0/3

Introduction to Node.js and NPM (How nodejs works, why is it required)

Learn how to install libraries and use them

Create a server

Modules in Node.js

0/6

What are modules?

Filesystem and path modules

npm, nvm and nodemon

HTTP module

events in Node.js

Create your own module

Introduction to express.js

0/5

Understanding Express.js

Creating APIs with Express

0/10

Introduction to REST APIs

Routing with Express.js (Make your first route!)

Controllers in Express.js (Handle your first route request!)

Middleware in Express.js (Protect your routes, mutate/modify requests on go!)

Error Handling

Building a REST API with Express.js

Data Storage with MongoDB

0/11

Introduction to Databases

SQL vs NoSQL

Introduction to MongoDB (What is MongoDB (NoSQL DB), what are document based databases?)

Integrating MongoDB with Node.js (connecting your database to your backend)

Introduction to Mongoose

Data Modeling and Validation with Mongoose

Stitching all together: Understanding MERN Stack

0/8

Overview of MERN Stack

Setting up the Development Environment (Using VSCode)

Managing the structure

Understanding the connection state

MERN project

0/2

Instagram

Amazon

Git and GitHub

0/4

Introduction to Version Control

Git Basics

Branching and Merging

Collaborating on GitHub

Deployment

0/2

Introduction to Deployment and Hosting

Deployment of MERN applications

Low Level System Design

Low Level Design (Basic Building Blocks)

0/5

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

Creational Design Quiz

Structural Design Patterns

0/5

Structural Design Quiz

Behavioural Design Patterns

0/5

Behavioural Design Quiz

LLD Topics

Pizza factory

0/7

SQL Query builder

0/7

Introduction & Class Diagram

Logger

0/11

Car Price Calculator LLD Chapter 1

Car Price Calculator

0/12

Car Price Calculator LLD Chapter 2

Car Price Calculator LLD Chapter 3

Car Price Calculator LLD Chapter 4

Car Price Calculator LLD Chapter 5

Weather Station

0/7

Ticket management system

0/7

Payment Processor LLD Chapter 1

Payment processor

0/11

02:48

Payment Processor LLD Chapter 2

Payment Processor LLD Chapter 3

Payment Processor LLD Chapter 4

Elevator System

0/7

Discussion on Parking Spots and Parking Service

Car parking

0/20

Class Diagram continued

How to add Logging in the system

Coding Part 2 (Adding Logging in the system)

Implementing Parking pots using Decorator Design pattern

0/7

Amazon

0/7

PayPal

0/8

Introduction to Paypal

Snakes and Ladders Game Implementation

Assignment

0/2

Design Patterns

High Level System Design

High Level Design ( Building Blocks )

0/11

Redundancy and Replication

SQL vs NoSQL

Data Partitioning