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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Most Asked Interview Questions with Answers πŸ’»βœ…
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Complete roadmap to learn Python and Data Structures & Algorithms (DSA) in 2 months

### Week 1: Introduction to Python

Day 1-2: Basics of Python
- Python setup (installation and IDE setup)
- Basic syntax, variables, and data types
- Operators and expressions

Day 3-4: Control Structures
- Conditional statements (if, elif, else)
- Loops (for, while)

Day 5-6: Functions and Modules
- Function definitions, parameters, and return values
- Built-in functions and importing modules

Day 7: Practice Day
- Solve basic problems on platforms like HackerRank or LeetCode

### Week 2: Advanced Python Concepts

Day 8-9: Data Structures in Python
- Lists, tuples, sets, and dictionaries
- List comprehensions and generator expressions

Day 10-11: Strings and File I/O
- String manipulation and methods
- Reading from and writing to files

Day 12-13: Object-Oriented Programming (OOP)
- Classes and objects
- Inheritance, polymorphism, encapsulation

Day 14: Practice Day
- Solve intermediate problems on coding platforms

### Week 3: Introduction to Data Structures

Day 15-16: Arrays and Linked Lists
- Understanding arrays and their operations
- Singly and doubly linked lists

Day 17-18: Stacks and Queues
- Implementation and applications of stacks
- Implementation and applications of queues

Day 19-20: Recursion
- Basics of recursion and solving problems using recursion
- Recursive vs iterative solutions

Day 21: Practice Day
- Solve problems related to arrays, linked lists, stacks, and queues

### Week 4: Fundamental Algorithms

Day 22-23: Sorting Algorithms
- Bubble sort, selection sort, insertion sort
- Merge sort and quicksort

Day 24-25: Searching Algorithms
- Linear search and binary search
- Applications and complexity analysis

Day 26-27: Hashing
- Hash tables and hash functions
- Collision resolution techniques

Day 28: Practice Day
- Solve problems on sorting, searching, and hashing

### Week 5: Advanced Data Structures

Day 29-30: Trees
- Binary trees, binary search trees (BST)
- Tree traversals (in-order, pre-order, post-order)

Day 31-32: Heaps and Priority Queues
- Understanding heaps (min-heap, max-heap)
- Implementing priority queues using heaps

Day 33-34: Graphs
- Representation of graphs (adjacency matrix, adjacency list)
- Depth-first search (DFS) and breadth-first search (BFS)

Day 35: Practice Day
- Solve problems on trees, heaps, and graphs

### Week 6: Advanced Algorithms

Day 36-37: Dynamic Programming
- Introduction to dynamic programming
- Solving common DP problems (e.g., Fibonacci, knapsack)

Day 38-39: Greedy Algorithms
- Understanding greedy strategy
- Solving problems using greedy algorithms

Day 40-41: Graph Algorithms
- Dijkstra’s algorithm for shortest path
- Kruskal’s and Prim’s algorithms for minimum spanning tree

Day 42: Practice Day
- Solve problems on dynamic programming, greedy algorithms, and advanced graph algorithms

### Week 7: Problem Solving and Optimization

Day 43-44: Problem-Solving Techniques
- Backtracking, bit manipulation, and combinatorial problems

Day 45-46: Practice Competitive Programming
- Participate in contests on platforms like Codeforces or CodeChef

Day 47-48: Mock Interviews and Coding Challenges
- Simulate technical interviews
- Focus on time management and optimization

Day 49: Review and Revise
- Go through notes and previously solved problems
- Identify weak areas and work on them

### Week 8: Final Stretch and Project

Day 50-52: Build a Project
- Use your knowledge to build a substantial project in Python involving DSA concepts

Day 53-54: Code Review and Testing
- Refactor your project code
- Write tests for your project

Day 55-56: Final Practice
- Solve problems from previous contests or new challenging problems

Day 57-58: Documentation and Presentation
- Document your project and prepare a presentation or a detailed report

Day 59-60: Reflection and Future Plan
- Reflect on what you've learned
- Plan your next steps (advanced topics, more projects, etc.)

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

Credits: https://t.me/free4unow_backup

ENJOY LEARNING πŸ‘πŸ‘
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Python vs C++ vs Java πŸ˜‚
DSA Roadmap πŸ‘†
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5 Steps to learn DSA πŸ‘†
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Getting job offers as a developer involves several steps:πŸ‘¨β€πŸ’»πŸš€

1. Build a Strong Portfolio: Create a portfolio of projects that showcase your skills. Include personal projects, open-source contributions, or freelance work. This demonstrates your abilities to potential employers.πŸ‘¨β€πŸ’»

2. Enhance Your Skills: Stay updated with the latest technologies and trends in your field. Consider taking online courses, attending workshops, or earning certifications to bolster your skills.πŸš€

3. Network: Attend industry events, conferences, and meetups to connect with professionals in your field. Utilize social media platforms like LinkedIn to build a professional network.πŸ”₯

4. Resume and Cover Letter: Craft a tailored resume and cover letter for each job application. Highlight relevant skills and experiences that match the job requirements.πŸ“‡

5. Job Search Platforms: Utilize job search websites like LinkedIn, Indeed, Glassdoor, and specialized platforms like Stack Overflow Jobs, GitHub Jobs, or AngelList for tech-related positions. πŸ”

6. Company Research: Research companies you're interested in working for. Customize your application to show your genuine interest in their mission and values.πŸ•΅οΈβ€β™‚οΈ

7. Prepare for Interviews: Be ready for technical interviews. Practice coding challenges, algorithms, and data structures. Also, be prepared to discuss your past projects and problem-solving skills.πŸ“

8. Soft Skills: Develop your soft skills like communication, teamwork, and problem-solving. Employers often look for candidates who can work well in a team and communicate effectively.πŸ’»

9. Internships and Freelancing: Consider internships or freelancing opportunities to gain practical experience and build your resume. 🏠

10. Personal Branding: Maintain an online presence by sharing your work, insights, and thoughts on platforms like GitHub, personal blogs, or social media. This can help you get noticed by potential employers.πŸ‘¦

11. Referrals: Reach out to your network and ask for referrals from people you know in the industry. Employee referrals are often highly valued by companies.🌈

12. Persistence: The job search process can be challenging. Don't get discouraged by rejections. Keep applying, learning, and improving your skills.πŸ’―

13. Negotiate Offers: When you receive job offers, negotiate your salary and benefits. Research industry standards and be prepared to discuss your expectations.πŸ“‰

Remember that the job search process can take time, so patience is key. By focusing on these steps and continuously improving your skills and network, you can increase your chances of receiving job offers as a developer.
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πŸš€ Roadmap to Become a Software Architect πŸ‘¨β€πŸ’»

πŸ“‚ Programming & Development Fundamentals
β€ƒβˆŸπŸ“‚ Master One or More Programming Languages (Java, C#, Python, etc.)
β€ƒβ€ƒβˆŸπŸ“‚ Learn Data Structures & Algorithms
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Understand Design Patterns & Best Practices

πŸ“‚ Software Design & Architecture Principles
β€ƒβˆŸπŸ“‚ Learn SOLID Principles & Clean Code Practices
β€ƒβ€ƒβˆŸπŸ“‚ Master Object-Oriented & Functional Design
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Understand Domain-Driven Design (DDD)

πŸ“‚ System Design & Scalability
β€ƒβˆŸπŸ“‚ Learn Microservices & Monolithic Architectures
β€ƒβ€ƒβˆŸπŸ“‚ Understand Load Balancing, Caching & CDNs
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Dive into CAP Theorem & Event-Driven Architecture

πŸ“‚ Databases & Storage Solutions
β€ƒβˆŸπŸ“‚ Master SQL & NoSQL Databases
β€ƒβ€ƒβˆŸπŸ“‚ Learn Database Scaling & Sharding Strategies
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Understand Data Warehousing & ETL Processes

πŸ“‚ Cloud Computing & DevOps
β€ƒβˆŸπŸ“‚ Learn Cloud Platforms (AWS, Azure, GCP)
β€ƒβ€ƒβˆŸπŸ“‚ Understand CI/CD & Infrastructure as Code (IaC)
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Work with Containers & Kubernetes

πŸ“‚ Security & Performance Optimization
β€ƒβˆŸπŸ“‚ Master Secure Coding Practices
β€ƒβ€ƒβˆŸπŸ“‚ Learn Authentication & Authorization (OAuth, JWT)
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Optimize System Performance & Reliability

πŸ“‚ Project Management & Communication
β€ƒβˆŸπŸ“‚ Work with Agile & Scrum Methodologies
β€ƒβ€ƒβˆŸπŸ“‚ Collaborate with Cross-Functional Teams
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Improve Technical Documentation & Decision-Making

πŸ“‚ Real-World Experience & Leadership
β€ƒβˆŸπŸ“‚ Design & Build Scalable Software Systems
β€ƒβ€ƒβˆŸπŸ“‚ Contribute to Open-Source & Architectural Discussions
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Mentor Developers & Lead Engineering Teams

πŸ“‚ Interview Preparation & Career Growth
β€ƒβˆŸπŸ“‚ Solve System Design Challenges
β€ƒβ€ƒβˆŸπŸ“‚ Master Architectural Case Studies
β€ƒβ€ƒβ€ƒβˆŸπŸ“‚ Network & Apply for Software Architect Roles

βœ… Get Hired as a Software Architect

React "❀️" for More πŸ‘¨β€πŸ’»
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Want to practice for your next interview?

Then use this prompt and ask Chat GPT to act as an interviewer πŸ˜„πŸ‘‡ (Tap to copy)

I want you to act as an interviewer. I will be the
candidate and you will ask me the
interview questions for the position position. I
want you to only reply as the interviewer.
Do not write all the conservation at once. I
want you to only do the interview with me.
Ask me the questions and wait for my answers.
Do not write explanations. Ask me the
questions one by one like an interviewer does
and wait for my answers. My first
sentence is "Hi"

Now see how it goes. All the best for your preparation
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Common Coding Mistakes to Avoid
Even experienced programmers make mistakes.


Undefined variables:

Ensure all variables are declared and initialized before use.

Type coercion:

Be mindful of JavaScript's automatic type conversion, which can lead to unexpected results.

Incorrect scope:

Understand the difference between global and local scope to avoid unintended variable access.

Logical errors:

Carefully review your code for logical inconsistencies that might lead to incorrect output.

Off-by-one errors:

Pay attention to array indices and loop conditions to prevent errors in indexing and iteration.

Infinite loops:

Avoid creating loops that never terminate due to incorrect conditions or missing exit points.

Example:
// Undefined variable error
let result = x + 5; // Assuming x is not declared

// Type coercion error
let age = "30";
let isAdult = age >= 18; // Age will be converted to a number

By being aware of these common pitfalls, you can write more robust and error-free code.

Do you have any specific coding mistakes you've encountered recently?
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πŸ”Ή Placement Ready in 3 Months! πŸ”Ή

1. Month 1: Aptitude
- Quantitative Aptitude, Logical Reasoning, Verbal Ability
- Daily practice and mock tests

2. Month 1 & 2: Course Fundamentals
- OOPS, DBMS, OS, CN, Java, C++
- Study plan and resources

3. Months 1, 2, & 3: Coding
- Data Structures and Algorithms (DSA)
- Practice on platforms like Hackerrank, Codechef, and Leetcode

4. Projects, Skills, and Internships
- Full-stack or ML projects
- Internship experiences and interview prep

5. Month 3: Mock Interviews
- Practice with Pramp and peers

Top Coding Interview Resources to prepare for Microsoft, Amazon, Meta, Apple, Adobe, VMware, Visa, Twitter, LinkedIn, JP Morgan, Goldman Sachs, Oracle and Walmart πŸ‘‡πŸ‘‡ https://topmate.io/coding/951517

All the best πŸ‘πŸ‘
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Step-by-Step Approach to learn DSA

➊ Learn One Programming Language 
↓
βž‹ Fundamentals β†’ Time & Space Complexity
↓
➌ Brute Force Algorithms 
↓
➍ Basic Data Structures β†’ Array, Linked List 
↓
➎ Simple Search Algorithm 
↓
➏ Sorting Techniques β†’ Bubble, Selection, Insertion 
↓
➐ Slightly Complex Algorithms β†’ Recursion, DnC 
↓
βž‘ Complex Data Structures β†’ Stack, Queue, Tree

DSA Interview Preparation Resources: https://topmate.io/coding/886874

ENJOY LEARNING πŸ‘πŸ‘
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100+ Practice Questions

❍ C/C++
❍ Python
❍ JavaScript
❍ Java
❍ C#
❍ Golang

➊ Simple Numbers

βž€ Find a digit at a specific place in a number
➁ Find count of digits in a number
βž‚ Find the largest digit
βžƒ Find the 2nd largest digit
βž„ Find the kth largest digit
βž… Find the smallest digit
βž† Find the 2nd smallest digit
βž‡ Find the kth smallest digit
➈ Find generic root (sum of all digits) of a number
βž‰ Reverse the digits in a number
βž€βž€ Rotate the digits in a number
βž€βž Is the number a palindrome?
βž€βž‚ Find sum of 'n' numbers
βž€βžƒ Check if a number is perfect square
βž€βž„ Find a number in an AP sequence
βž€βž… Find a number in a GP sequence
βž€βž† Find a number in fibonacci sequence
βž€βž‡ Check number divisibility by 2, 3, 5, 9
βž€βžˆ Check if a number is primary or not
20. Given a number, print all primes smaller than it
βžβž€ Check if a number is circular prime or not
➁➁ Find all prime factors of a number
βžβž‚ Find the GCD of 2 numbers
βžβžƒ Find the LCM of 2 numbers
βžβž„ Find the factorial of a number
βžβž… Find the exponentiation of a number

βž‹ Unit Conversion

βž€ Number Base (Binary, Octal, Hexadecimal, Decimal)
➁ Weight (gram, kg, pound)
βž‚ Height (cm, m, inch, feet)
βžƒ Temperature (centigrade, fahrenhite)
βž„ Distance (km, mile)
βž… Area (mΒ², kmΒ², acre)
βž† Volume (ltr, gallon)
βž‡ Time (sec, min, hour)
➈ Currency

➌ Calculator

βž€ Loan EMI Calculator
➁ Fixed Deposit Returns Calculator
βž‚ Interest Calculator
βžƒ BMI Calculator
βž„ Item Price (considering tax, discount, shipping)
βž… Tip Calculator

➍ Geometry

βž€ Find distance between 2 points
➁ Given 2 sides of a right angle triangle, find the 3rd
βž‚ Find 3rd angle of a triangle when 2 are given
βžƒ Area of a triangle when 3 sides are given
βž„ Area of a right angle triangle
βž… Perimeter of a Square
βž† Area of a Square
βž‡ Perimeter of a Rectangle
➈ Area of a Rectangle
βž‰ Circumference of a Circle
βž€βž€ Area of a Circle
βž€βž Circumference of a Semi-Circle
βž€βž‚ Area of a Semi-Circle
βž€βžƒ Area of a Ring
βž€βž„ Circumference of an Ellipse
βž€βž… Area of an Ellipse
βž€βž† Suface Area of a Sphere
βž€βž‡ Volume of a Sphere
βž€βžˆ Surface Area of a Hemisphere
20. Volume of a Hemisphere
βžβž€ Surface area of a Cube
➁➁ Volume of a Cube
βžβž‚ Surface area of a Cylinder
βžβžƒ Volume of a Cylinder

➎ Vector

βž€ Find Scalar Multiplication of a vector
➁ Find addition/subtraction of vectors
βž‚ Find magnitude of a vector
βžƒ Find an unit vector along a given vector
βž„ Find dot product of 2 vectors
βž… Find cross product of 2 vectors
βž† Check if 2 vectors are orthogonal

➏ Matrix

βž€ Find the determinant of a matrix
➁ Find Scalar Multiplication of a matrix
βž‚ Find addition/subtraction of matrices
βžƒ Find the transpose of a matrix
βž„ Find if 2 matrices are orthogonal
βž… Find inverse of a 2x2 and 3x3 matrix

➐ Set

βž€ Find Union of 2 sets
➁ Find Intersection of 2 sets
βž‚ Find the Difference of 2 sets
βžƒ Find the Symmetric Difference of 2 sets
βž„ Find if a set is subset/superset of another set
βž… Find if 2 sets are disjoints

βž‘ Special Numbers

βž€ Strong Number
➁ Perfect Number
βž‚ Armstrong Number
βžƒ Harshad Number
βž„ Kaprekar Number
βž… Lychrel Number
βž† Narcissistic Decimal Number
βž‡ Lucus Number
➈ Catalan Number
βž‰ Duck Number
βž€βž€ Ugly Number
βž€βž Abundant Number
βž€βž‚ Deficient Number
βž€βžƒ Automorphic Number
βž€βž„ Magic Number
βž€βž… Friendly Pair Numbers
βž€βž† Neon Number
βž€βž‡ Spy Number
βž€βžˆ Happy Number
20. Sunny Number
βžβž€ Disarium Number
➁➁ Pronic Number
βžβž‚ Trimorphic Number
βžβžƒ Evil Number
βžβž„ Amicable Pairs
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Git Commands

πŸ›  git init – Initialize a new Git repository
πŸ“₯ git clone <repo> – Clone a repository
πŸ“Š git status – Check the status of your repository
βž• git add <file> – Add a file to the staging area
πŸ“ git commit -m "message" – Commit changes with a message
πŸš€ git push – Push changes to a remote repository
⬇️ git pull – Fetch and merge changes from a remote repository


Branching

πŸ“Œ git branch – List all branches
🌱 git branch <name> – Create a new branch
πŸ”„ git checkout <branch> – Switch to a branch
πŸ”— git merge <branch> – Merge a branch into the current branch
⚑️ git rebase <branch> – Apply commits on top of another branch


Undo & Fix Mistakes

βͺ git reset --soft HEAD~1 – Undo the last commit but keep changes
❌ git reset --hard HEAD~1 – Undo the last commit and discard changes
πŸ”„ git revert <commit> – Create a new commit that undoes a specific commit


Logs & History

πŸ“– git log – Show commit history
🌐 git log --oneline --graph --all – View commit history in a simple graph


Stashing

πŸ“₯ git stash – Save changes without committing
🎭 git stash pop – Apply stashed changes and remove them from stash


Remote & Collaboration

🌍 git remote -v – View remote repositories
πŸ“‘ git fetch – Fetch changes without merging
πŸ•΅οΈ git diff – Compare changes


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