Data structures common interview questions

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 Here are some common data structures interview questions:

  1. What is a data structure?
  2. What is the difference between an array and a linked list?
  3. What is a stack? Give an example of its use.
  4. What is a queue? Give an example of its use.
  5. What is a binary search tree? How is it different from a regular tree?
  6. Explain the difference between BFS and DFS.
  7. What is a hash table? Give an example of its use.
  8. What is the time complexity for searching an element in a binary search tree?
  9. Explain how a priority queue works.
  10. What is a graph? How is it represented in memory?
  11. What is the most efficient way to find the second largest element in an unsorted array?
  12. Can you implement a queue using two stacks? If so, how?
  13. How can you detect if a linked list has a loop in it? Can you implement an algorithm for this?
  14. What is a trie data structure? Give an example of its use.
  15. How can you find the kth largest element in a binary search tree?
  16. How can you efficiently find the intersection of two sorted arrays?
  17. How can you reverse a stack using only a queue?
  18. How can you implement a graph using an adjacency list? What are some advantages of using an adjacency list over an adjacency matrix?
  19. Can you explain the difference between a red-black tree and an AVL tree?
  20. How can you check if a binary tree is a valid binary search tree?


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