18. AVL Tree Rotations
The chapter explains the mechanics of balancing binary search trees, particularly focusing on rotations to maintain height balance. It elucidates the conditions under which left and right rotations should be executed in response to imbalances in the tree structure. By optimizing these operations, the approach ensures logarithmic time complexity for various operations including insertion, deletion, and searching.
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What we have learnt
- Balancing trees using rotations preserves the height balance of binary search trees.
- Height balance conditions are determined by comparing the heights of subtrees.
- Using height information stored in tree nodes allows for efficient balancing without full tree traversal.
Key Concepts
- -- HeightBalanced Tree
- A binary tree where the height of the two child subtrees of any node differ by no more than one.
- -- Rotations
- Local operations performed on a tree to change its structure while maintaining the binary search property.
- -- Complexity
- The performance measure, indicating that all operations related to a height-balanced tree can be performed in logarithmic time relative to the number of nodes.
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