Test Your Knowledge

You’ve learned a lot about BSTs. Let’s see how well you understand them.

Quick Review

Before the quiz, remember these key points:

1. BST Property: Left < Root < Right (recursively)
2. Search: O(log n) average, O(n) worst
3. Insertion: Find spot, add node
4. Deletion: Three cases (0, 1, or 2 children)
5. Traversal: In-order gives sorted values

Practice Exercise

Arrange these BST operations in the correct order for inserting values 50, 30, 70, 20:

Knowledge Check Quiz

Coding Challenge

Try implementing a function to check if a tree is a valid BST:

Key Takeaways

You’ve mastered:

✅ BST Structure: Nodes with left and right pointers
✅ BST Property: Left < Root < Right
✅ Insertion: Find spot, add node
✅ Search: Follow BST property to find value
✅ Deletion: Handle three cases correctly
✅ Traversal: In-order, pre-order, post-order
✅ Time Complexity: O(log n) average, O(n) worst

What You Can Build Now

With BST knowledge, you can:

• Implement efficient search in your applications
• Build ordered data structures
• Understand how databases index data
• Solve tree-based algorithm problems
• Design efficient data storage

Next Steps

• Practice with more BST problems on LeetCode
• Learn about self-balancing trees (AVL, Red-Black)
• Explore B-trees used in databases
• Study tree algorithms (lowest common ancestor, etc.)

Great job completing this tutorial!