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Top 20 Data Structure Interview Questions

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Java Coding Interview Questions Easy 1. Reverse a string without using a built-in reverse function. 2. Find the largest and smallest element in an array. 3. Check whether a string is a palindrome. 4. Check whether two strings are anagrams. 5. Remove duplicate elements from an array. 6. Count the frequency of each element in an array. 7. Find the intersection of two arrays. 8. Move all zeros in an array to the end while maintaining the order of the other elements. 9. Check whether a number is prime. 10. Find the factorial of a number using recursion. 11. Generate the Fibonacci sequence using both iteration and recursion. 12. Check whether a number is a palindrome. 13. Find the greatest common divisor of two numbers. 14. Implement linear search without using built-in search functions. 15. Sort an array using bubble sort. 16. Sort an array using insertion sort. 17. Sort an array using selection sort. Medium 18. Find the second largest element in an array without sorting the array. 19. Find the first non-repeating character in a string. 20. Find the missing number in an array containing numbers from 1 to n. 21. Find all duplicate elements in an array. 22. Find the maximum sum of a contiguous subarray. 23. Merge two sorted arrays into one sorted array. 24. Find whether an array contains two numbers that add up to a given target. 25. Rotate an array to the right by k positions. 26. Find the longest substring without repeating characters. 27. Reverse an integer without converting it to a string. 28. Implement binary search on a sorted array. 29. Implement a stack using an array. 30. Implement a queue using an array. 31. Reverse a linked list. 32. Find the middle node of a linked list. 33. Merge two sorted linked lists. 34. Implement a function to check whether parentheses are balanced. Hard 35. Detect whether a linked list contains a cycle. 36. Find the height of a binary tree. 37. Perform inorder, preorder, and postorder traversal of a binary tree. 38. Find the maximum depth of a binary tree. 39. Determine whether two binary trees are identical. 40. Find the lowest common ancestor of two nodes in a binary tree.

🧠 Coding Myths You Should Stop Believing There's a lot of advice online about learning to code. But not all of it is true. 👀 Here are some common myths developers hear all the time 👇 ❌ Myth #1: You Need to Know Mathematics to Code ✅ Reality: Most programming doesn't require advanced mathematics. Logic, problem-solving and practice matter much more for everyday development. ❌ Myth #2: You Need to Learn Many Programming Languages ✅ Reality: You can become a great developer by becoming really good at one language first. ❌ Myth #3: You Need 100+ LeetCode Problems ✅ Reality: Solving problems is useful, but understanding patterns and improving your problem-solving ability matters more than chasing a number. ❌ Myth #4: More GitHub Commits = Better Developer ✅ Reality: A developer with 20 meaningful commits can learn more than someone making hundreds of meaningless commits. ❌ Myth #5: AI Means You Don't Need to Learn Coding ✅ Reality: AI can write code, but you still need to understand what that code does, identify mistakes and make good technical decisions. 🤖 💡 Don't blindly follow coding advice. Understand the "why" behind it. 💾 Save this if you're learning to code.

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