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Coding Interview Resources

Coding Interview Resources

@crackingthecodinginterview

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

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Post #3141 1.26K
If you want to get a job as a machine learning engineer, donโ€™t start by diving into the hottest libraries like PyTorch,TensorFlow, Langchain, etc.

Yes, you might hear a lot about them or some other trending technology of the year...but guess what!

Technologies evolve rapidly, especially in the age of AI, but core concepts are always seen as more valuable than expertise in any particular tool. Stop trying to perform a brain surgery without knowing anything about human anatomy.

Instead, here are basic skills that will get you further than mastering any framework:


๐Œ๐š๐ญ๐ก๐ž๐ฆ๐š๐ญ๐ข๐œ๐ฌ ๐š๐ง๐ ๐’๐ญ๐š๐ญ๐ข๐ฌ๐ญ๐ข๐œ๐ฌ - My first exposure to probability and statistics was in college, and it felt abstract at the time, but these concepts are the backbone of ML.

You can start here: Khan Academy Statistics and Probability - https://www.khanacademy.org/math/statistics-probability

๐‹๐ข๐ง๐ž๐š๐ซ ๐€๐ฅ๐ ๐ž๐›๐ซ๐š ๐š๐ง๐ ๐‚๐š๐ฅ๐œ๐ฎ๐ฅ๐ฎ๐ฌ - Concepts like matrices, vectors, eigenvalues, and derivatives are fundamental to understanding how ml algorithms work. These are used in everything from simple regression to deep learning.

๐๐ซ๐จ๐ ๐ซ๐š๐ฆ๐ฆ๐ข๐ง๐  - Should you learn Python, Rust, R, Julia, JavaScript, etc.? The best advice is to pick the language that is most frequently used for the type of work you want to do. I started with Python due to its simplicity and extensive library support, and it remains my go-to language for machine learning tasks.

You can start here: Automate the Boring Stuff with Python - https://automatetheboringstuff.com/

๐€๐ฅ๐ ๐จ๐ซ๐ข๐ญ๐ก๐ฆ ๐”๐ง๐๐ž๐ซ๐ฌ๐ญ๐š๐ง๐๐ข๐ง๐  - Understand the fundamental algorithms before jumping to deep learning. This includes linear regression, decision trees, SVMs, and clustering algorithms.

๐ƒ๐ž๐ฉ๐ฅ๐จ๐ฒ๐ฆ๐ž๐ง๐ญ ๐š๐ง๐ ๐๐ซ๐จ๐๐ฎ๐œ๐ญ๐ข๐จ๐ง:
Knowing how to take a model from development to production is invaluable. This includes understanding APIs, model optimization, and monitoring. Tools like Docker and Flask are often used in this process.

๐‚๐ฅ๐จ๐ฎ๐ ๐‚๐จ๐ฆ๐ฉ๐ฎ๐ญ๐ข๐ง๐  ๐š๐ง๐ ๐๐ข๐  ๐ƒ๐š๐ญ๐š:
Familiarity with cloud platforms (AWS, Google Cloud, Azure) and big data tools (Spark) is increasingly important as datasets grow larger. These skills help you manage and process large-scale data efficiently.

You can start here: Google Cloud Machine Learning - https://cloud.google.com/learn/training/machinelearning-ai

I love frameworks and libraries, and they can make anyone's job easier.

But the more solid your foundation, the easier it will be to pick up any new technologies and actually validate whether they solve your problems.

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

All the best ๐Ÿ‘๐Ÿ‘
  • โค 1
Post #3138 1.26K
๐Ÿš€ Top Coding Interview Concepts โ€“ Part 4 ๐Ÿ’ป๐Ÿ”ฅ

31. Polymorphism

The ability of the same method or interface to behave differently depending on the object using it.

Example: Different classes can implement the same draw() method in different ways.

32. Abstraction

Hiding unnecessary implementation details and exposing only the essential functionality.

Example: You use a print() function without needing to know how the printer works internally.

33. Constructor

A special method that is automatically called when an object is created and is typically used to initialize its properties.

Example: A Car constructor can set the car's model and color when the object is created.

34. Interface

A contract that defines methods or behaviors a class must provide, without necessarily defining how they are implemented.

Example: A Payment interface may require pay() to be implemented by different payment methods.

35. Method Overloading

Defining multiple methods with the same name but different parameters.

Example: An add() method can accept two numbers or three numbers, depending on the language's support for overloading.

36. Method Overriding

When a child class provides its own implementation of a method already defined in its parent class.

Example: Dog can override an Animal class's sound() method.

37. Pointer

A variable that stores the memory address of another variable or object.

Example: Pointers are commonly used in C and C++ for direct memory manipulation.

38. Reference

A way to refer to an existing object or value without necessarily creating a separate copy of it.

Example: Multiple variables can reference the same object in memory.

39. Memory Management

The process of allocating, using, and releasing memory efficiently during program execution.

Example: Garbage collection automatically removes objects that are no longer needed in languages such as Java and Python.

40. Garbage Collection

An automatic memory-management process that identifies and frees memory occupied by objects that are no longer reachable or needed.

๐Ÿ’ฌ Double Tap โค๏ธ for Part 5!
  • โค 1
Post #3136 1.18K
๐Ÿš€ Complete SQL Roadmap ๐Ÿ—„๐Ÿ”ฅ

๐Ÿง  STEP 1: Learn SQL Basics
โœ” What is SQL?
โœ” Databases & Tables
โœ” SELECT Statement
โœ” WHERE Clause
โœ” ORDER BY

๐Ÿ›  Databases to Practice:
โœ” MySQL
โœ” PostgreSQL
โœ” SQL Server

๐Ÿ“Š STEP 2: Learn Filtering & Aggregation
โœ” DISTINCT
โœ” LIMIT & TOP
โœ” COUNT, SUM, AVG
โœ” MIN & MAX
โœ” GROUP BY & HAVING

โšก STEP 3: Master SQL JOINS
โœ” INNER JOIN
โœ” LEFT JOIN
โœ” RIGHT JOIN
โœ” FULL JOIN
โœ” SELF JOIN

๐Ÿ›  Concepts to Learn:
โœ” Primary Key
โœ” Foreign Key
โœ” Relationships

๐Ÿ“ˆ STEP 4: Learn Advanced SQL
โœ” Subqueries
โœ” Common Table Expressions (CTEs)
โœ” CASE WHEN
โœ” UNION & UNION ALL
โœ” EXISTS & IN

๐Ÿ”ฅ STEP 5: Learn Window Functions
โœ” ROW_NUMBER()
โœ” RANK()
โœ” DENSE_RANK()
โœ” LEAD() & LAG()
โœ” PARTITION BY

๐Ÿง  STEP 6: Learn Database Design
โœ” Normalization
โœ” Schema Design
โœ” Indexing
โœ” Constraints
โœ” Data Integrity

โ˜๏ธ STEP 7: Learn SQL Optimization
โœ” Query Optimization
โœ” Execution Plans
โœ” Index Optimization
โœ” Performance Tuning

๐Ÿ›  Tools to Learn:
โœ” DBeaver
โœ” pgAdmin
โœ” MySQL Workbench

๐Ÿ“‚ STEP 8: Build Real SQL Projects
โœ” Sales Database Analysis
โœ” Employee Management System
โœ” E-commerce Database
โœ” Customer Analytics
โœ” Inventory Management

๐Ÿ’ก SQL Notes: https://whatsapp.com/channel/0029VbCyzS02ZjCwoShXXc2j

๐Ÿ’ฌ Tap โค๏ธ if this helped you!
  • โค 4
Post #3123 1.39K
Python Interview Questions with Answers
  • โค 1
Post #3118 1.34K
โœ… Top GitHub Repositories to Learn Coding (FREE) ๐Ÿง‘โ€๐Ÿ’ปโญ

1๏ธโƒฃ ๐Ÿ“˜ JavaScript Algorithms
github.com/trekhleb/javascript-algorithms
โ€“ 100+ algorithms & data structures in JS with explanations
โ€“ Great for interviews and DSA prep

2๏ธโƒฃ ๐Ÿ“— 30 Days of JavaScript
github.com/Asabeneh/30-Days-Of-JavaScript
โ€“ Learn JS step-by-step from basics to DOM & OOP
โ€“ Ideal for self-paced learners

3๏ธโƒฃ ๐Ÿ“™ System Design Primer
github.com/donnemartin/system-design-primer
โ€“ Learn how to design scalable systems
โ€“ Must-read for backend & interview prep

4๏ธโƒฃ ๐Ÿ“’ Awesome Python
github.com/vinta/awesome-python
โ€“ Curated list of Python libraries, tools, and resources
โ€“ Explore everything from web dev to ML

5๏ธโƒฃ ๐Ÿ“• Frontend Developer Roadmap
github.com/EnoahNetz/Frontend-Developer-Interview-Preparation
โ€“ Full frontend prep with HTML, CSS, JS, React
โ€“ Also includes interview tips & resources

6๏ธโƒฃ ๐Ÿ““ Developer Roadmap
github.com/kamranahmedse/developer-roadmap
โ€“ Visual roadmap for frontend, backend, DevOps
โ€“ Helps you plan your learning path

7๏ธโƒฃ ๐Ÿ“” Free Programming Books
github.com/EbookFoundation/free-programming-books
โ€“ 1000+ books in 30+ languages
โ€“ Covers all major programming topics

๐Ÿ’ก Pro Tip: Star and fork useful repos. Use GitHub like your personal learning library.

๐Ÿ’ฌ Tap โค๏ธ for more!
  • โค 2
  • ๐Ÿ‘ 1
Post #3115 1.38K
๐Ÿš€ Top Coding Interview Concepts โ€“ Part 2 ๐Ÿ’ป

11. Stack 
A linear data structure that follows the LIFO (Last In, First Out) principle. The last element added is the first one removed.

12. Queue 
A linear data structure that follows the FIFO (First In, First Out) principle. The first element added is the first one removed.

13. Hash Table (Hash Map) 
A data structure that stores key-value pairs and provides fast insertion, deletion, and lookup using a hash function.

14. Tree 
A hierarchical data structure consisting of nodes connected by edges, commonly used to represent hierarchical relationships.

15. Binary Search Tree (BST) 
A special type of binary tree where values smaller than the root are stored on the left, and larger values on the right.

16. Graph 
A collection of nodes (vertices) connected by edges, used to model relationships such as social networks or maps.

17. Sorting 
The process of arranging data in a specific order, such as ascending or descending, to improve searching and processing.

18. Searching 
The process of finding a specific element within a collection of data using algorithms like Linear Search or Binary Search.

19. Time Complexity 
A measure of how the execution time of an algorithm grows as the input size increases, commonly represented using Big-O notation.

20. Space Complexity 
A measure of the amount of memory an algorithm requires relative to the input size, helping evaluate memory efficiency.

๐Ÿ’ฌ Double Tap โค๏ธ for Part 3!
  • โค 6
Post #3113 1.33K
Coding and Aptitude Round before interview

Coding challenges are meant to test your coding skills (especially if you are applying for ML engineer role). The coding challenges can contain algorithm and data structures problems of varying difficulty. These challenges will be timed based on how complicated the questions are. These are intended to test your basic algorithmic thinking.
Sometimes, a complicated data science question like making predictions based on twitter data are also given. These challenges are hosted on HackerRank, HackerEarth, CoderByte etc. In addition, you may even be asked multiple-choice questions on the fundamentals of data science and statistics. This round is meant to be a filtering round where candidates whose fundamentals are little shaky are eliminated. These rounds are typically conducted without any manual intervention, so it is important to be well prepared for this round.

Sometimes a separate Aptitude test is conducted or along with the technical round an aptitude test is also conducted to assess your aptitude skills. A Data Scientist is expected to have a good aptitude as this field is continuously evolving and a Data Scientist encounters new challenges every day. If you have appeared for GMAT / GRE or CAT, this should be easy for you.

Resources for Prep:

For algorithms and data structures prep,Leetcode and Hackerrank are good resources.

For aptitude prep, you can refer to IndiaBixand Practice Aptitude.

With respect to data science challenges, practice well on GLabs and Kaggle.

Brilliant is an excellent resource for tricky math and statistics questions.

For practising SQL, SQL Zoo and Mode Analytics are good resources that allow you to solve the exercises in the browser itself.

Things to Note:

Ensure that you are calm and relaxed before you attempt to answer the challenge. Read through all the questions before you start attempting the same. Let your mind go into problem-solving mode before your fingers do!

In case, you are finished with the test before time, recheck your answers and then submit.

Sometimes these rounds donโ€™t go your way, you might have had a brain fade, it was not your day etc. Donโ€™t worry! Shake if off for there is always a next time and this is not the end of the world.
  • โค 5
Post #3111 1.4K
10 Steps to Landing a High Paying Job in Data Analytics

1. Learn SQL - joins & windowing functions is most important

2. Learn Excel- pivoting, lookup, vba, macros is must

3. Learn Dashboarding on POWER BI/ Tableau

4. โ Learn Python basics- mainly pandas, numpy, matplotlib and seaborn libraries

5. โ Know basics of descriptive statistics

6. โ With AI/ copilot integrated in every tool, know how to use it and add to your projects

7. โ Have hands on any 1 cloud platform- AZURE/AWS/GCP

8. โ WORK on atleast 2 end to end projects and create a portfolio of it

9. โ Prepare an ATS friendly resume & start applying

10. โ Attend interviews (you might fail in first 2-3 interviews thats fine),make a list of questions you could not answer & prepare those.

Give more interview to boost your chances through consistent practice & feedback ๐Ÿ˜„๐Ÿ‘
  • โค 4
Post #3110 1.37K
Last 25 seats | Batch closing this week!
โ€‹
โ€‹๐—”๐—œ & ๐——๐—ฎ๐˜๐—ฎ ๐—ฆ๐—ฐ๐—ถ๐—ฒ๐—ป๐—ฐ๐—ฒ ๐—ฃ๐—ฟ๐—ผ๐—ด๐—ฟ๐—ฎ๐—บ (๐—ก๐—ผ ๐—–๐—ผ๐—ฑ๐—ถ๐—ป๐—ด ๐—ก๐—ฒ๐—ฒ๐—ฑ๐—ฒ๐—ฑ)

E&ICT Academy, IIT Roorkee is closing admissions for their Data Science & AI Certification on 2nd August 2026.

โœ… No coding background needed
โœ… IIT faculty-led program
โœ… Certificate from E&ICT IIT Roorkee

๐—”๐—ฝ๐—ฝ๐—น๐˜† ๐—ฏ๐—ฒ๐—ณ๐—ผ๐—ฟ๐—ฒ ๐˜€๐—ฒ๐—ฎ๐˜๐˜€ ๐—ณ๐—ถ๐—น๐—น ๐˜‚๐—ฝ:-

https://pdlink.in/4aYWald

๐Ÿ’ซDeadline: 2nd August 2026
Post #3109 1.42K
๐Ÿš€ Top 10 Careers in Data Analytics (2026)๐Ÿ“Š๐Ÿ’ผ

1๏ธโƒฃ Data Analyst
โ–ถ๏ธ Skills: Excel, SQL, Power BI, Data Cleaning, Data Visualization
๐Ÿ’ฐ Avg Salary: โ‚น6โ€“15 LPA (India) / 90K+ USD (Global)

2๏ธโƒฃ Business Intelligence (BI) Analyst
โ–ถ๏ธ Skills: Power BI, Tableau, SQL, Data Modeling, Dashboard Design
๐Ÿ’ฐ Avg Salary: โ‚น8โ€“18 LPA / 100K+

3๏ธโƒฃ Product Analyst
โ–ถ๏ธ Skills: SQL, Python, A/B Testing, Product Metrics, Experimentation
๐Ÿ’ฐ Avg Salary: โ‚น12โ€“25 LPA / 120K+

4๏ธโƒฃ Analytics Engineer
โ–ถ๏ธ Skills: SQL, dbt, Data Modeling, Data Warehousing, ETL
๐Ÿ’ฐ Avg Salary: โ‚น12โ€“22 LPA / 120K+

5๏ธโƒฃ Marketing Analyst
โ–ถ๏ธ Skills: Google Analytics, SQL, Excel, Customer Segmentation, Attribution Analysis
๐Ÿ’ฐ Avg Salary: โ‚น7โ€“16 LPA / 95K+

6๏ธโƒฃ Financial Data Analyst
โ–ถ๏ธ Skills: Excel, SQL, Forecasting, Financial Modeling, Power BI
๐Ÿ’ฐ Avg Salary: โ‚น8โ€“18 LPA / 105K+

7๏ธโƒฃ Data Visualization Specialist
โ–ถ๏ธ Skills: Tableau, Power BI, Storytelling with Data, Dashboard Design
๐Ÿ’ฐ Avg Salary: โ‚น7โ€“17 LPA / 100K+

8๏ธโƒฃ Operations Analyst
โ–ถ๏ธ Skills: SQL, Excel, Process Analysis, Business Metrics, Reporting
๐Ÿ’ฐ Avg Salary: โ‚น6โ€“15 LPA / 95K+

9๏ธโƒฃ Risk & Fraud Analyst
โ–ถ๏ธ Skills: SQL, Python, Fraud Detection Models, Statistical Analysis
๐Ÿ’ฐ Avg Salary: โ‚น10โ€“20 LPA / 110K+

๐Ÿ”Ÿ Analytics Consultant
โ–ถ๏ธ Skills: SQL, BI Tools, Business Strategy, Stakeholder Communication
๐Ÿ’ฐ Avg Salary: โ‚น12โ€“28 LPA / 125K+

๐Ÿ“Š Data Analytics is one of the most practical and fastest ways to enter the tech industry in 2026.

Double Tap โค๏ธ if this helped you!
  • โค 4
Post #3108 1.42K
๐Ÿš€ ๐—š๐—ผ๐—ผ๐—ด๐—น๐—ฒ ๐—™๐—ฅ๐—˜๐—˜ ๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€ ๐—–๐—ผ๐˜‚๐—ฟ๐˜€๐—ฒ๐˜€ ๐Ÿ“Š๐Ÿ”ฅ

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