Coding Interview Resources

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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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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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): ► 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 — 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. ► 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 → Linked List → Stacks → Queues - You can follow the DSA videos on my channel. - Practice while learning is a must. ► 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 — note down how you solved each question, what tricks worked, and how you optimized it. ► Step 4: Start giving contests (don’t wait till you’re “ready”) Most students wait to “finish 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 — solve the questions you couldn’t during the contest. ► Step 5: Revise smart Create a “Revision 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:👇 https://whatsapp.com/channel/0029VazkxJ62UPB7OQhBE502 ENJOY LEARNING 👍👍

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Algorithms for Coding Interviews 👆

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💻 Popular Coding Languages & Their Uses 🚀 There are many programming languages, each serving different purposes. Here are some key ones you should know: 🔹 1. Python – Beginner-friendly, versatile, and widely used in data science, AI, web development, and automation. 🔹 2. JavaScript – Essential for frontend and backend web development, powering interactive websites and applications. 🔹 3. Java – Used for enterprise applications, Android development, and large-scale systems due to its stability. 🔹 4. C++ – High-performance language ideal for game development, operating systems, and embedded systems. 🔹 5. C# – Commonly used in game development (Unity), Windows applications, and enterprise software. 🔹 6. Swift – The go-to language for iOS and macOS development, known for its efficiency. 🔹 7. Go (Golang) – Designed for high-performance applications, cloud computing, and network programming. 🔹 8. Rust – Focuses on memory safety and performance, making it great for system-level programming. 🔹 9. SQL – Essential for database management, allowing efficient data retrieval and manipulation. 🔹 10. Kotlin – Popular for Android app development, offering modern features compared to Java. 🔥 React ❤️ for more 😊🚀

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DSA Handwritten Notes

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✅Meta interview questions : Most asked in last 30 days 1. 1249. Minimum Remove to Make Valid Parentheses 2. 408. Valid Word Abbreviation 3. 215. Kth Largest Element in an Array 4. 314. Binary Tree Vertical Order Traversal 5. 88. Merge Sorted Array 6. 339. Nested List Weight Sum 7. 680. Valid Palindrome II 8. 973. K Closest Points to Origin 9. 1650. Lowest Common Ancestor of a Binary Tree III 10. 1. Two Sum 11. 791. Custom Sort String 12. 56. Merge Intervals 13. 528. Random Pick with Weight 14. 1570. Dot Product of Two Sparse Vectors 15. 50. Pow(x, n) 16. 65. Valid Number 17. 227. Basic Calculator II 18. 560. Subarray Sum Equals K 19. 71. Simplify Path 20. 200. Number of Islands 21. 236. Lowest Common Ancestor of a Binary Tree 22. 347. Top K Frequent Elements 23. 498. Diagonal Traverse 24. 543. Diameter of Binary Tree 25. 1768. Merge Strings Alternately 26. 2. Add Two Numbers 27. 4. Median of Two Sorted Arrays 28. 7. Reverse Integer 29. 31. Next Permutation 30. 34. Find First and Last Position of Element in Sorted Array 31. 84. Largest Rectangle in Histogram 32. 146. LRU Cache 33. 162. Find Peak Element 34. 199. Binary Tree Right Side View 35. 938. Range Sum of BST 36. 17. Letter Combinations of a Phone Number 37. 125. Valid Palindrome 38. 153. Find Minimum in Rotated Sorted Array 39. 283. Move Zeroes 40. 523. Continuous Subarray Sum 41. 658. Find K Closest Elements 42. 670. Maximum Swap 43. 827. Making A Large Island 44. 987. Vertical Order Traversal of a Binary Tree 45. 1757. Recyclable and Low Fat Products 46. 1762. Buildings With an Ocean View 47. 2667. Create Hello World Function 48. 5. Longest Palindromic Substring 49. 15. 3Sum 50. 19. Remove Nth Node From End of List 51. 70. Climbing Stairs 52. 80. Remove Duplicates from Sorted Array II 53. 113. Path Sum II 54. 121. Best Time to Buy and Sell Stock 55. 127. Word Ladder 56. 128. Longest Consecutive Sequence 57. 133. Clone Graph 58. 138. Copy List with Random Pointer 59. 140. Word Break II 60. 142. Linked List Cycle II 61. 145. Binary Tree Postorder Traversal 62. 173. Binary Search Tree Iterator 63. 206. Reverse Linked List 64. 207. Course Schedule 65. 394. Decode String 66. 415. Add Strings 67. 437. Path Sum III 68. 468. Validate IP Address 70. 691. Stickers to Spell Word 71. 725. Split Linked List in Parts 72. 766. Toeplitz Matrix 73. 708. Insert into a Sorted Circular Linked List 74. 1091. Shortest Path in Binary Matrix 75. 1514. Path with Maximum Probability 76. 1609. Even Odd Tree 77. 1868. Product of Two Run-Length Encoded Arrays 78. 2022. Convert 1D Array Into 2D Array DSA Interview Preparation Resources: https://topmate.io/coding/886874 ENJOY LEARNING 👍👍

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