Trees Interview Questions | Data-Structures | NextRound

1What is a Tree? Define Node, Root, Leaf, Edge, Height, Depth.Beginner

2What is a Binary Tree?Beginner

3What is a Binary Search Tree (BST)? What are its properties?Beginner

4What is the difference between a Binary Tree and a Binary Search Tree?Beginner

5Explain Tree Traversals: Inorder, Preorder, Postorder, Level Order.Beginner

6How do you implement Inorder traversal iteratively? (Without recursion)Intermediate

7How do you find the Lowest Common Ancestor (LCA) of two nodes in a BST?Intermediate

8How do you validate if a given Tree is a valid BST?Intermediate

9What is a Balanced Tree? Why do we need balance?Beginner

10What is a Complete Binary Tree? A Full Binary Tree? A Perfect Binary Tree?Beginner

11What is a Heap? (Min-Heap and Max-Heap)Beginner

12How is a Heap implemented using an Array? (Parent/Child index math)Intermediate

13What is the time complexity of insertion and deletion in a Heap? Why?Intermediate

14What is Heapify? Explain the process.Intermediate

15What is a Trie (Prefix Tree)? When is it used?Intermediate

16How does a Trie compare to a Hash Table for string storage?Intermediate

17What is an AVL Tree? What is a Red-Black Tree? What is the difference?Advanced

18Why do databases prefer B-Trees/B+ Trees over Binary Search Trees?Advanced

19How do you serialize and deserialize a Binary Tree?Intermediate

20What is a Segment Tree? What problems does it solve?Advanced

21What is a Fenwick Tree (Binary Indexed Tree)?Advanced

22What is the difference between a B-Tree and a B+ Tree? Why are B+ Trees better for disk access?Advanced

23Explain the concept of Tree Rotation.Intermediate

24What is a Splay Tree? When would you use it?Advanced

25How do you find the diameter of a Binary Tree?Intermediate

26How do you check if a tree is symmetric (Mirror image)?Intermediate