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4 cards from this section. Quick, good the night before a test.
What is the balance factor in AVL trees?
It's related to the heights of current node's children.
Define a left rotation.
Think about which way the tree is rotating.
What does a balance factor of -2 indicate?
Think about how height differences affect balance.
When is a left rotation performed?
Recall when imbalance necessitates rotative adjustments.
Given a series of values to insert into an AVL tree, demonstrate the rebalancing steps needed to maintain balance. List the rotations performed after each insertion.
Refer to individual balance factors after each node is added to check for required rotations.
Create a visual representation of an AVL tree before and after a series of rotations. What does this tell about the efficiency of AVL balancing relative to normal BSTs?
Be attentive to height imbalances when comparing the two tree types.
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