Post✅ *Top 50 Coding Interview Questions (With Concepts)* 💻🚀

✅ *Top 50 Coding Interview Questions (With Concepts)* 💻🚀 1. What is time and space complexity? 2. Big-O Notation – Why is it important? 3. Difference between array and linked list 4. Stack vs Queue – Use cases 5. Implement a stack using arrays 6. What is a hash table? 7. How does a hashmap work internally? 8. Difference between recursion and iteration 9. Solve Fibonacci with recursion and memoization 10. Explain sliding window technique 11. Explain two-pointer approach with an example 12. Reverse a linked list 13. Detect cycle in a linked list 14. Merge two sorted linked lists 15. Find the middle of a linked list 16. Binary Search – Code and logic 17. Find first and last occurrence in sorted array 18. Implement a binary search tree 19. BST – Inorder, Preorder, Postorder traversal 20. Lowest Common Ancestor in BST 21. Height vs Depth of a tree 22. Level-order traversal using queue 23. Implement a min heap / max heap 24. Heap sort vs Merge sort 25. Quick sort – Pivot logic 26. Merge intervals problem 27. Kadane's algorithm for max subarray 28. Longest common prefix 29. Longest palindrome substring 30. Anagram detection 31. Count unique characters in a string 32. Implement LRU Cache 33. Dynamic programming – Top-down vs Bottom-up 34. Coin change problem 35. 0/1 Knapsack problem 36. Longest increasing subsequence 37. Topological sort in a DAG 38. Detect cycle in a graph (DFS) 39. Dijkstra’s algorithm 40. A* pathfinding algorithm 41. Trie – Insert and search 42. Word break problem 43. Backtracking – N Queens 44. Subsets and permutations 45. Bit manipulation – Count set bits 46. XOR tricks – Find missing number 47. Design a parking lot (OOP question) 48. Thread-safe singleton pattern 49. API rate limiter design 50. Debugging a memory leak in code 💬 *Tap ❤️ for more!*