Questions
17 of 26
What is an AVL Tree? What is a Red-Black Tree? What is the difference?
Difficulty: 5/10
AVL vs Red-Black Tree
AVL and Red-Black Trees are self-balancing Binary Search Trees. AVL Trees maintain a stricter balance condition: the height difference between the left and right subtrees of every node is at most one. Red-Black Trees use node colors and a set of invariants to guarantee logarithmic height while allowing more structural flexibility. AVL trees generally provide faster lookups due to tighter balance, while Red-Black Trees often provide efficient updates with fewer rotations.
javascript
- 1
Both guarantee O(log n) search, insertion, and deletion.
- 2
AVL is more strictly balanced.
- 3
Red-Black Trees generally require fewer rotations during updates.
- 4
AVL is attractive for read-heavy workloads.
- 5
Red-Black Trees are common in ordered maps and sets.
Follow-up Questions
- Explain the four AVL rotations.
- How does a Red-Black Tree maintain logarithmic height?