⚖️ BalancerAfter every insert, I check the balance factor of every ancestor on the path back to the root. More than 1 off, and I act immediately — never later.
🔄 RotationI never lose a single node. I just swap who's the parent and who's the child, locally, in O(1) — the whole rest of the tree stays untouched.
Pick a level above to begin.