DSA · Theory

AVL Tree

Theory

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If you can teach AVL Tree using folder on disk, you know it. If you only know the heading, you don’t.

AVL Tree order — meaning → left < root < right → one limit. Dumping ten features helps nobody.

Without AVL Tree, a file explorer gets messy and folder on disk is hard to trust.

AVL Tree shows up in a file explorer. Name folder on disk, not “a real-world scenario”.

Don’t do this with AVL Tree — unbalanced BST becoming a list. Interviewers spot it in ten seconds.

After AVL Tree, Asha should still remember unbalanced BST becoming a list.

Close AVL Tree with — “If I skip it, folder on disk goes wrong like this: unbalanced BST becoming a list.”

Exam tip

Say AVL Tree in one breath, then left < root < right, then unbalanced BST becoming a list.

# AVL Tree
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

AVL Tree: dry-run [4, 1, 3]. Say the list after one step.