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Theoretical Questions for Coding Interviews on Basic Data Structures

1. What is a Data Structure?
A data structure is a way of organizing and storing data so that it can be accessed and modified efficiently. Common data structures include arrays, linked lists, stacks, queues, and trees.

2. What is an Array?
An array is a collection of elements, each identified by an index. It has a fixed size and stores elements of the same type in contiguous memory locations.

3. What is a Linked List?
A linked list is a linear data structure where elements (nodes) are stored non-contiguously. Each node contains a value and a reference (or link) to the next node. Unlike arrays, linked lists can grow dynamically.

4. What is a Stack?
A stack is a linear data structure that follows the Last In, First Out (LIFO) principle. The most recently added element is the first one to be removed. Common operations include push (add an element) and pop (remove an element).

5. What is a Queue?
A queue is a linear data structure that follows the First In, First Out (FIFO) principle. The first element added is the first one to be removed. Common operations include enqueue (add an element) and dequeue (remove an element).

6. What is a Binary Tree?
A binary tree is a hierarchical data structure where each node has at most two children, usually referred to as the left and right child. It is used for efficient searching and sorting.

7. What is the difference between an array and a linked list?

Array: Fixed size, elements stored in contiguous memory.

Linked List: Dynamic size, elements stored non-contiguously, each node points to the next.


8. What is the time complexity for accessing an element in an array vs. a linked list?

Array: O(1) for direct access by index.

Linked List: O(n) for access, as you must traverse the list from the start to find an element.


9. What is the time complexity for inserting or deleting an element in an array vs. a linked list?

Array:

Insertion/Deletion at the end: O(1).

Insertion/Deletion at the beginning or middle: O(n) because elements must be shifted.


Linked List:

Insertion/Deletion at the beginning: O(1).

Insertion/Deletion in the middle or end: O(n), as you need to traverse the list.



10. What is a HashMap (or Dictionary)?
A HashMap is a data structure that stores key-value pairs. It allows efficient lookups, insertions, and deletions using a hash function to map keys to values. Average time complexity for these operations is O(1).

Coding interview: https://whatsapp.com/channel/0029VammZijATRSlLxywEC3X
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📩 Correct Way to Mail a Resume

Subject: Application For The [Role] at [Company Name]

Dear [Hiring Manager’s Name],

I hope you’re doing great. I came across the [Position Title] role at [Company Name] and was really excited about the opportunity to apply. With my experience in [mention key relevant experience], I believe I could bring value to your team.

I’ve attached my Resume for your review. I trust my background aligns with what you’re looking for, I’d love the chance to discuss how I can contribute to your team. Looking forward to hearing your thoughts!

Best regards,
[Your Name]
[Link To Linkedin]
[Link To Resume]

📩 Message to a Recruiter After Seeing Their Job Posting

Subject: Excited to Apply for [Position Title] at [Company Name]

Hi [Recruiter’s Name],

I trust you have a awesome day today 🙂
I just saw your post about the [Position Title] opening at [Company Name], and I couldn’t wait to reach out! I’ve been following [Company Name]
for a while now, and I truly admire [mention something specific—company’s projects, culture, values, recent achievements].

With my expertise in [mention relevant skills/experience], I believe I’d be a great fit for this role. I’ve attached my Resume for your review, and I’d love the chance to discuss how my experience can contribute to your team.

Would you be open to a quick chat?
Looking forward to your thoughts!

[Your Resume]

✉️ Warm Networking DM

Subject: Exploring Opportunities at [Company Name]

Hi [First Name],

I believe you have a wonderful day today 😊
I’m a [Your Role] specializing in [mention key skills]. I’ve been following [Company Name] for a while and love [mention something specific about their work, culture, or achievements].

With experience in [mention a key project or skill], I believe I could bring value to your team. If you’re open to it, I’d love to chat about any opportunities, where my skills could be a great fit.

I know you must get a ton of messages, so I really appreciate your time. Looking forward to hearing from you!

Warm,
[Your Name]
[Your Resume]
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Javascript is the most widely used scripting language used on server side and client side. While to start learning Javascript , you need a proper path for better understanding of popular frameworks like Angular or Reactjs.. Here's a roadmap to learn Javascript..


Hope you liked it
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Time Complexity of Sorting Algorithms
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API Architecture
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AI Toolkit Cheat Sheet – Tools & Libraries You Should Know

Python – The foundation language for AI and ML
NumPy & Pandas – Data handling and manipulation
Scikit-learn – Core ML algorithms and model evaluation
TensorFlow & PyTorch – Deep learning frameworks for building and training neural networks
OpenCV – Real-time computer vision and image processing
spaCy & NLTK – Natural Language Processing tools
Hugging Face Transformers – Pre-trained models for NLP tasks like summarization, translation, and Q&A
Gradio & Streamlit – Easy tools to create UI and deploy your AI models
Jupyter Notebook – Interactive coding and experimentation
Google Colab – Cloud-based Jupyter with free GPU support

These tools make it easier to build, test, and deploy AI solutions.

#ai #artificialintelligence
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Javascript is everywhere. Millions of webpages are built on JS.

Let’s discuss some of the basic concept of javascript which are important to learn for any Javascript developer.

1 Scope
2 Hoisting
3 Closures
4 Callbacks
5 Promises
6 Async & Await
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