Coding Interview Resources
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This channel contains the free resources and solution of coding problems which are usually asked in the interviews.

Managed by: @love_data
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Join this coding WhatsApp group πŸ‘‡ You will thank me later πŸ˜ŠπŸ‘‡

https://whatsapp.com/channel/0029VahiFZQ4o7qN54LTzB17
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Top Libraries & Frameworks by Language πŸ“šπŸ’»

❯ Python
 ‒ Pandas ➟ Data Analysis
 ‒ NumPy ➟ Math & Arrays
 ‒ Scikit-learn ➟ Machine Learning
 ‒ TensorFlow / PyTorch ➟ Deep Learning
 ‒ Flask / Django ➟ Web Development
 ‒ OpenCV ➟ Image Processing

❯ JavaScript / TypeScript
 ‒ React ➟ UI Development
 ‒ Vue ➟ Lightweight SPAs
 ‒ Angular ➟ Enterprise Apps
 ‒ Next.js ➟ Full-Stack Web
 ‒ Express ➟ Backend APIs
 ‒ Three.js ➟ 3D Web Graphics

❯ Java
 ‒ Spring Boot ➟ Microservices
 ‒ Hibernate ➟ ORM
 ‒ Apache Maven ➟ Build Automation
 ‒ Apache Kafka ➟ Real-Time Data

❯ C++
 ‒ Boost ➟ Utility Libraries
 ‒ Qt ➟ GUI Applications
 ‒ Unreal Engine ➟ Game Development

❯ C#
 ‒ .NET / ASP.NET ➟ Web Apps
 ‒ Unity ➟ Game Development
 ‒ Entity Framework ➟ ORM

❯ R
 ‒ ggplot2 ➟ Data Visualization
 ‒ dplyr ➟ Data Manipulation
 ‒ caret ➟ Machine Learning
 ‒ Shiny ➟ Interactive Dashboards

❯ PHP
 ‒ Laravel ➟ Full-Stack Web
 ‒ Symfony ➟ Web Framework
 ‒ PHPUnit ➟ Testing

❯ Go (Golang)
 ‒ Gin ➟ Web Framework
 ‒ Gorilla ➟ Web Toolkit
 ‒ GORM ➟ ORM for Go

❯ Rust
 ‒ Actix ➟ Web Framework
 ‒ Rocket ➟ Web Development
 ‒ Tokio ➟ Async Runtime

Coding Resources: https://whatsapp.com/channel/0029VahiFZQ4o7qN54LTzB17

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πŸ’» Popular Coding Languages & Their Uses πŸš€

There are many programming languages, each serving different purposes. Here are some key ones you should know:

πŸ”Ή 1. Python – Beginner-friendly, versatile, and widely used in data science, AI, web development, and automation.

πŸ”Ή 2. JavaScript – Essential for frontend and backend web development, powering interactive websites and applications.

πŸ”Ή 3. Java – Used for enterprise applications, Android development, and large-scale systems due to its stability.

πŸ”Ή 4. C++ – High-performance language ideal for game development, operating systems, and embedded systems.

πŸ”Ή 5. C# – Commonly used in game development (Unity), Windows applications, and enterprise software.

πŸ”Ή 6. Swift – The go-to language for iOS and macOS development, known for its efficiency.

πŸ”Ή 7. Go (Golang) – Designed for high-performance applications, cloud computing, and network programming.

πŸ”Ή 8. Rust – Focuses on memory safety and performance, making it great for system-level programming.

πŸ”Ή 9. SQL – Essential for database management, allowing efficient data retrieval and manipulation.

πŸ”Ή 10. Kotlin – Popular for Android app development, offering modern features compared to Java.

πŸ”₯ React ❀️ for more πŸ˜ŠπŸš€
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Algorithms for Coding Interviews πŸ‘†
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πŸ”° Frontend Web Development Roadmap 2025 (With Mini Projects)

β”œβ”€β”€ 🧠 Basics of How the Web Works (HTTP, DNS, Hosting)
β”œβ”€β”€ πŸ“„ HTML5 (Structure, Forms, Media)
β”œβ”€β”€ 🎨 CSS3 (Box Model, Flexbox, Grid, Animations)
β”œβ”€β”€ πŸ–± Mini Project: Personal Portfolio Website
β”œβ”€β”€ ⚑️ JavaScript Fundamentals (Events, DOM, Arrays, Functions)
β”œβ”€β”€ πŸ§ͺ Mini Project: Interactive Quiz App
β”œβ”€β”€ βš™οΈ Version Control with Git & GitHub
β”œβ”€β”€ πŸ“± Responsive Design with Media Queries
β”œβ”€β”€ πŸ§ͺ Mini Project: Responsive Blog Homepage
β”œβ”€β”€ πŸ“¦ Introduction to NPM, VS Code Shortcuts, Emmet
β”œβ”€β”€ βš› Intro to Frontend Frameworks: React/Vue

Frontend Development Resources: https://whatsapp.com/channel/0029VaxfCpv2v1IqQjv6Ke0r

ENJOY LEARNING πŸ‘πŸ‘
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If I wanted to get my opportunity to interview at Google or Amazon for SDE roles in the next 6-8 months…

Here’s exactly how I’d approach it (I’ve taught this to 100s of students and followed it myself to land interviews at 3+ FAANGs):

β–Ί Step 1: Learn to Code (from scratch, even if you’re from non-CS background)

I helped my sister go from zero coding knowledge (she studied Biology and Electrical Engineering) to landing a job at Microsoft.

We started with:
- A simple programming language (C++, Java, Python β€” pick one)
- FreeCodeCamp on YouTube for beginner-friendly lectures
- Key rule: Don’t just watch. Code along with the video line by line.

Time required: 30–40 days to get good with loops, conditions, syntax.

β–Ί Step 2: Start with DSA before jumping to development

Why?
- 90% of tech interviews in top companies focus on Data Structures & Algorithms
- You’ll need time to master it, so start early.

Start with:
- Arrays β†’ Linked List β†’ Stacks β†’ Queues
- You can follow the DSA videos on my channel.
- Practice while learning is a must.

β–Ί Step 3: Follow a smart topic order

Once you’re done with basics, follow this path:

1. Searching & Sorting
2. Recursion & Backtracking
3. Greedy
4. Sliding Window & Two Pointers
5. Trees & Graphs
6. Dynamic Programming
7. Tries, Heaps, and Union Find

Make revision notes as you go β€” note down how you solved each question, what tricks worked, and how you optimized it.

β–Ί Step 4: Start giving contests (don’t wait till you’re β€œready”)

Most students wait to β€œfinish DSA” before attempting contests.
That’s a huge mistake.

Contests teach you:
- Time management under pressure
- Handling edge cases
- Thinking fast

Platforms: LeetCode Weekly/ Biweekly, Codeforces, AtCoder, etc.
And after every contest, do upsolving β€” solve the questions you couldn’t during the contest.

β–Ί Step 5: Revise smart

Create a β€œRevision Sheet” with 100 key problems you’ve solved and want to reattempt.

Every 2-3 weeks, pick problems randomly and solve again without seeing solutions.

This trains your recall + improves your clarity.

Coding Projects:πŸ‘‡
https://whatsapp.com/channel/0029VazkxJ62UPB7OQhBE502

ENJOY LEARNING πŸ‘πŸ‘
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Technical Questions Wipro may ask on their interviews

1. Data Structures and Algorithms:
   - "Can you explain the difference between an array and a linked list? When would you use one over the other in a real-world application?"
   - "Write code to implement a binary search algorithm."

2. Programming Languages:
   - "What is the difference between Java and C++? Can you provide an example of a situation where you would prefer one language over the other?"
   - "Write a program in your preferred programming language to reverse a string."

3. Database and SQL:
   - "Explain the ACID properties in the context of database transactions."
   - "Write an SQL query to retrieve all records from a 'customers' table where the 'country' column is 'India'."

4. Networking:
   - "What is the difference between TCP and UDP? When would you choose one over the other for a specific application?"
   - "Explain the concept of DNS (Domain Name System) and how it works."

5. System Design:
   - "Design a simple online messaging system. What components would you include, and how would they interact?"
   - "How would you ensure the scalability and fault tolerance of a web service or application?"
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Java Constructor Interview Questions:

1. What are Constructors?
- Constructor is a method which is used to initialize an instance of the class.

2. How does Constructor differ from a normal method?
- Constructor has same name as class name. It doesn't have a return type. Constructor gets invoked only when instance of the object is getting created.

3. Can we invoke one Constructor from another Constructor?
- Yes. Using this keyword.

4. Can we invoke superclass Constructor from Child class?
- Yes. Using super keyword.
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### Learn Git Easily 🀩

Here's all you need to get started πŸ™Œ

1. Introduction to Git
- What is Git?
- Differences between Git and other version control systems
- Installing Git

2. Git Basics
- Creating a new repository
- Cloning a repository
- Understanding the working directory, staging area, and repository

3. Basic Commands
- git init
- git clone
- git add
- git commit
- git status
- git log

4. Branching and Merging
- Understanding branches
- Creating branches (git branch)
- Switching branches (git checkout)
- Merging branches (git merge)
- Resolving merge conflicts

5. Remote Repositories
- Adding a remote repository (git remote add)
- Fetching changes (git fetch)
- Pushing changes (git push)
- Pulling changes (git pull)

6. Stashing Changes
- Stashing modifications (git stash)
- Applying stashed changes (git stash apply)
- Listing and dropping stashes

7. Viewing Changes
- Checking differences (git diff)
- Viewing commit history (git log)
- Viewing specific changes in a commit (git show)

8. Reverting Changes
- Undoing changes (git checkout)
- Reverting commits (git revert)
- Resetting commits (git reset)

9. Working with Tags
- Creating tags (git tag)
- Listing tags
- Pushing tags to remote

10. Collaboration and Workflows
- Pull Requests (PRs) in platforms like GitHub and GitLab
- Forking repositories
- Code reviews and merging PRs

11. Git Configurations
- Setting up user information (git config)
- Global vs. local configurations
- Configuring SSH keys for GitHub

12. Best Practices
- Writing good commit messages
- Branching strategies (e.g., Git Flow)
- Keeping a clean commit history

13. Git Hooks
- Introduction to Git hooks
- Common hooks (pre-commit, post-commit)

14. Advanced Git Commands
- Cherry-picking commits (git cherry-pick)
- Interactive rebasing (git rebase -i)
- Squashing commits

15. Using GUI Tools
- Overview of popular Git GUI clients (e.g., SourceTree, GitKraken)

16. Git Troubleshooting
- Common issues and how to resolve them
- Understanding the .git directory

17. Resources for Continued Learning
- Official Git documentation
- Online tutorials and courses
- Git cheat sheets
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Master Javascript :

The JavaScript Tree πŸ‘‡
|
|── Variables
| β”œβ”€β”€ var
| β”œβ”€β”€ let
| └── const
|
|── Data Types
| β”œβ”€β”€ String
| β”œβ”€β”€ Number
| β”œβ”€β”€ Boolean
| β”œβ”€β”€ Object
| β”œβ”€β”€ Array
| β”œβ”€β”€ Null
| └── Undefined
|
|── Operators
| β”œβ”€β”€ Arithmetic
| β”œβ”€β”€ Assignment
| β”œβ”€β”€ Comparison
| β”œβ”€β”€ Logical
| β”œβ”€β”€ Unary
| └── Ternary (Conditional)
||── Control Flow
| β”œβ”€β”€ if statement
| β”œβ”€β”€ else statement
| β”œβ”€β”€ else if statement
| β”œβ”€β”€ switch statement
| β”œβ”€β”€ for loop
| β”œβ”€β”€ while loop
| └── do-while loop
|
|── Functions
| β”œβ”€β”€ Function declaration
| β”œβ”€β”€ Function expression
| β”œβ”€β”€ Arrow function
| └── IIFE (Immediately Invoked Function Expression)
|
|── Scope
| β”œβ”€β”€ Global scope
| β”œβ”€β”€ Local scope
| β”œβ”€β”€ Block scope
| └── Lexical scope
||── Arrays
| β”œβ”€β”€ Array methods
| | β”œβ”€β”€ push()
| | β”œβ”€β”€ pop()
| | β”œβ”€β”€ shift()
| | β”œβ”€β”€ unshift()
| | β”œβ”€β”€ splice()
| | β”œβ”€β”€ slice()
| | └── concat()
| └── Array iteration
| β”œβ”€β”€ forEach()
| β”œβ”€β”€ map()
| β”œβ”€β”€ filter()
| └── reduce()|
|── Objects
| β”œβ”€β”€ Object properties
| | β”œβ”€β”€ Dot notation
| | └── Bracket notation
| β”œβ”€β”€ Object methods
| | β”œβ”€β”€ Object.keys()
| | β”œβ”€β”€ Object.values()
| | └── Object.entries()
| └── Object destructuring
||── Promises
| β”œβ”€β”€ Promise states
| | β”œβ”€β”€ Pending
| | β”œβ”€β”€ Fulfilled
| | └── Rejected
| β”œβ”€β”€ Promise methods
| | β”œβ”€β”€ then()
| | β”œβ”€β”€ catch()
| | └── finally()
| └── Promise.all()
|
|── Asynchronous JavaScript
| β”œβ”€β”€ Callbacks
| β”œβ”€β”€ Promises
| └── Async/Await
|
|── Error Handling
| β”œβ”€β”€ try...catch statement
| └── throw statement
|
|── JSON (JavaScript Object Notation)
||── Modules
| β”œβ”€β”€ import
| └── export
|
|── DOM Manipulation
| β”œβ”€β”€ Selecting elements
| β”œβ”€β”€ Modifying elements
| └── Creating elements
|
|── Events
| β”œβ”€β”€ Event listeners
| β”œβ”€β”€ Event propagation
| └── Event delegation
|
|── AJAX (Asynchronous JavaScript and XML)
|
|── Fetch API
||── ES6+ Features
| β”œβ”€β”€ Template literals
| β”œβ”€β”€ Destructuring assignment
| β”œβ”€β”€ Spread/rest operator
| β”œβ”€β”€ Arrow functions
| β”œβ”€β”€ Classes
| β”œβ”€β”€ let and const
| β”œβ”€β”€ Default parameters
| β”œβ”€β”€ Modules
| └── Promises
|
|── Web APIs
| β”œβ”€β”€ Local Storage
| β”œβ”€β”€ Session Storage
| └── Web Storage API
|
|── Libraries and Frameworks
| β”œβ”€β”€ React
| β”œβ”€β”€ Angular
| └── Vue.js
||── Debugging
| β”œβ”€β”€ Console.log()
| β”œβ”€β”€ Breakpoints
| └── DevTools
|
|── Others
| β”œβ”€β”€ Closures
| β”œβ”€β”€ Callbacks
| β”œβ”€β”€ Prototypes
| β”œβ”€β”€ this keyword
| β”œβ”€β”€ Hoisting
| └── Strict mode
|
| END __
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Tools & Tech Every Developer Should Know βš’οΈπŸ‘¨πŸ»β€πŸ’»

❯ VS Code ➟ Lightweight, Powerful Code Editor
❯ Postman ➟ API Testing, Debugging
❯ Docker ➟ App Containerization
❯ Kubernetes ➟ Scaling & Orchestrating Containers
❯ Git ➟ Version Control, Team Collaboration
❯ GitHub/GitLab ➟ Hosting Code Repos, CI/CD
❯ Figma ➟ UI/UX Design, Prototyping
❯ Jira ➟ Agile Project Management
❯ Slack/Discord ➟ Team Communication
❯ Notion ➟ Docs, Notes, Knowledge Base
❯ Trello ➟ Task Management
❯ Zsh + Oh My Zsh ➟ Advanced Terminal Experience
❯ Linux Terminal ➟ DevOps, Shell Scripting
❯ Homebrew (macOS) ➟ Package Manager
❯ Anaconda ➟ Python & Data Science Environments
❯ Pandas ➟ Data Manipulation in Python
❯ NumPy ➟ Numerical Computation
❯ Jupyter Notebooks ➟ Interactive Python Coding
❯ Chrome DevTools ➟ Web Debugging
❯ Firebase ➟ Backend as a Service
❯ Heroku ➟ Easy App Deployment
❯ Netlify ➟ Deploy Frontend Sites
❯ Vercel ➟ Full-Stack Deployment for Next.js
❯ Nginx ➟ Web Server, Load Balancer
❯ MongoDB ➟ NoSQL Database
❯ PostgreSQL ➟ Advanced Relational Database
❯ Redis ➟ Caching & Fast Storage
❯ Elasticsearch ➟ Search & Analytics Engine
❯ Sentry ➟ Error Monitoring
❯ Jenkins ➟ Automate CI/CD Pipelines
❯ AWS/GCP/Azure ➟ Cloud Services & Deployment
❯ Swagger ➟ API Documentation
❯ SASS/SCSS ➟ CSS Preprocessors
❯ Tailwind CSS ➟ Utility-First CSS Framework

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Coding Jobs: https://whatsapp.com/channel/0029VatL9a22kNFtPtLApJ2L
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5 Algorithms you must know as a data scientist πŸ‘©β€πŸ’» πŸ§‘β€πŸ’»

1. Dimensionality Reduction
- PCA, t-SNE, LDA

2. Regression models
- Linesr regression, Kernel-based regression models, Lasso Regression, Ridge regression, Elastic-net regression

3. Classification models
- Binary classification- Logistic regression, SVM
- Multiclass classification- One versus one, one versus many
- Multilabel classification

4. Clustering models
- K Means clustering, Hierarchical clustering, DBSCAN, BIRCH models

5. Decision tree based models
- CART model, ensemble models(XGBoost, LightGBM, CatBoost)

Best Data Science & Machine Learning Resources: https://topmate.io/coding/914624

Join our WhatsApp channel: https://whatsapp.com/channel/0029Va8v3eo1NCrQfGMseL2D

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Beginner’s Roadmap to Learn Data Structures & Algorithms

1. Foundations: Start with the basics of programming and mathematical concepts to build a strong foundation.

2. Data Structure: Dive into essential data structures like arrays, linked lists, stacks, and queues to organise and store data efficiently.

3. Searching & Sorting: Learn various search and sort techniques to optimise data retrieval and organisation.

4. Trees & Graphs: Understand the concepts of binary trees and graph representation to tackle complex hierarchical data.

5. Recursion: Grasp the principles of recursion and how to implement recursive algorithms for problem-solving.

6. Advanced Data Structures: Explore advanced structures like hashing, heaps, and hash maps to enhance data manipulation.

7. Algorithms: Master algorithms such as greedy, divide and conquer, and dynamic programming to solve intricate problems.

8. Advanced Topics: Delve into backtracking, string algorithms, and bit manipulation for a deeper understanding.

9. Problem Solving: Practice on coding platforms like LeetCode to sharpen your skills and solve real-world algorithmic challenges.

10. Projects & Portfolio: Build real-world projects and showcase your skills on GitHub to create an impressive portfolio.

Best DSA RESOURCES: https://topmate.io/coding/886874

All the best πŸ‘πŸ‘
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