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Data Structures & AlgorithmsLearning
LESSON 18 / 75·2 min readAdvanced

30 interview questions to practice

Must knowConcept lesson
01 Understand02 Recall03 Prepare
  1. Two Sum
  2. Best Time to Buy and Sell Stock
  3. Product of Array Except Self
  4. Valid Anagram
  5. Longest Substring Without Repeating Characters
  6. Merge Intervals
  7. Valid Parentheses
  8. Daily Temperatures
  9. LRU Cache
  10. Reverse Linked List
  11. Merge Two Sorted Lists
  12. Remove Nth Node from End
  13. Palindrome Linked List
  14. Binary Tree Level Order Traversal
  15. Invert Binary Tree
  16. Diameter of Binary Tree
  17. Lowest Common Ancestor
  18. Validate BST
  19. Top K Frequent Elements
  20. Kth Largest Element
  21. Number of Islands
  22. Course Schedule
  23. Word Ladder
  24. Climbing Stairs
  25. House Robber
  26. Coin Change
  27. Unique Paths
  28. Jump Game
  29. Maximum Subarray
  30. Median of Two Sorted Arrays
PAUSE & RECALL

Can you explain it without the notes?

30 interview questions to practice

Use your own words. Explain an example and one limitation before checking the explanation.

Check your explanation
  1. Two Sum
CONNECT IT TO YOUR INTERVIEW

Turn this concept into a clear answer.

30 interview questions to practice

Data Structures & Algorithms·Interview practice & revision

1. Two Sum

Advanced2 min read
Practice this concept
YOUR NEXT STEP

Keep connecting the ideas.

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Adapted from 14_DSA_MASTER.md · “18. 30 interview questions to practice”. Examples are study fragments; framework behavior can depend on your version.