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Sep 4, 2026 · Fundamentals

AVL Balanced Binary Tree: How Four Rotations Fix BST Degeneration (Python Implementation)

This article explains AVL balanced binary trees, covering the balance factor, four rotation types (LL, RR, LR, RL), a complete Python implementation with height updates, real-world use cases, and a comparison showing AVL's guaranteed O(log n) query performance versus BST's degradation to O(n).