List of most asked Programming Interview Questions.

Are you preparing for a coding interview? This tweet is for you. It contains a list of the most asked interview questions from each topic.

Arrays

- How is an array sorted using quicksort?
- How do you reverse an array?
- How do you remove duplicates from an array?
- How do you find the 2nd largest number in an unsorted integer array?

Linked Lists

- How do you find the length of a linked list?
- How do you reverse a linked list?
- How do you find the third node from the end?
- How are duplicate nodes removed in an unsorted linked list?

Strings

- How do you check if a string contains only digits?
- How can a given string be reversed?
- How do you find the first non-repeated character?
- How do you find duplicate characters in strings?

Binary Trees

- How are all leaves of a binary tree printed?
- How do you check if a tree is a binary search tree?
- How is a binary search tree implemented?
- Find the lowest common ancestor in a binary tree?

Graph

- How to detect a cycle in a directed graph?
- How to detect a cycle in an undirected graph?
- Find the total number of strongly connected components?
- Find whether a path exists between two nodes of a graph?
- Find the minimum number of swaps required to sort an array.

Dynamic Programming

1. Find the longest common subsequence?
2. Find the longest common substring?
3. Coin change problem?
4. Box stacking problem?
5. Count the number of ways to cover a distance?

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1. HTML (Structure)
Tags, Elements, and Attributes
Headings, Paragraphs, Lists
Forms, Inputs, Buttons
Images, Videos, Links
Semantic HTML: <header>, <nav>, <main>, <footer>

2. CSS (Styling)
Selectors, Properties, and Values
Box Model (margin, padding, border)
Flexbox & Grid Layout
Positioning (static, relative, absolute, fixed, sticky)
Media Queries (Responsive Design)

3. JavaScript (Interactivity)
Variables, Data Types, Operators
Functions, Conditionals, Loops
DOM Manipulation (getElementById, addEventListener)
Events (click, submit, change)
Arrays & Objects

4. Version Control (Git & GitHub)
Initialize repository, clone, commit, push, pull
Branching and merge conflicts
Hosting code on GitHub

5. Responsive Design
Mobile-first approach
Viewport meta tag
Flexbox and CSS Grid for layouts
Using relative units (%, em, rem)

6. Browser Dev Tools
Inspect elements
Console for debugging JavaScript
Network tab for API requests

7. Basic SEO & Accessibility
Title tags, meta descriptions
Alt attributes for images
Proper use of semantic tags

8. Deployment
Hosting on GitHub Pages, Netlify, or Vercel
Domain name basics
Continuous deployment setup

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🗓️ Week 1: Build a Strong Foundation
⦁ Learn HTML: structure web content with tags, lists, tables, forms
⦁ Learn CSS: style webpages using selectors, properties, layouts
⦁ Practice on interactive platforms like freeCodeCamp or The Odin Project

🗓️ Week 2: Dive into JavaScript Basics
⦁ Understand variables, functions, loops, conditionals, events
⦁ Get familiar with making pages interactive (e.g., to-do list, calculator)
⦁ Use small projects to solidify learning

🗓️ Week 3: Advanced CSS & Responsive Design
⦁ Learn Flexbox, Grid, media queries for responsive layouts
⦁ Explore CSS frameworks like Bootstrap or Tailwind CSS
⦁ Practice building mobile-friendly web pages

🗓️ Week 4: Front-End Frameworks Basics
⦁ Choose one: React.js (most popular), Vue.js (easy for beginners), or Angular
⦁ Learn component-based architecture and state management basics
⦁ Build small UI components (buttons, forms, modals)

🗓️ Week 5: Version Control with Git & GitHub
⦁ Learn Git basics: init, add, commit, branch, merge, push
⦁ Host projects on GitHub and understand collaboration workflows
⦁ Practice by pushing your previous week projects

🗓️ Week 6: Back-End Basics
⦁ Understand what servers and APIs are
⦁ Learn a backend language like Node.js (JavaScript) or Python (recommended for beginners)
⦁ Explore databases basics (SQL or NoSQL) and CRUD operations

🗓️ Week 7: Building Full-Stack Applications
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⦁ Learn about RESTful APIs, authentication & authorization basics
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⦁ Build a complete web app (e.g., blog, to-do list, portfolio) from scratch
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💡 Tips:
⦁ Code daily and build small projects to practice concepts
⦁ Use resources like freeCodeCamp, The Odin Project, or YouTube tutorials

💬 Tap ❤️ for the detailed explanation of each topic!