easyNeetCode 150
Balanced Binary Tree
Return True if the tree is height-balanced Example: [3,9,20,null,null,15,7] => True
Balanced Binary Tree rewards clean traversal structure more than any clever shortcut. It's a great warm-up that builds traversal modeling without a ton of moving parts. Be clear about what a state is; that's the difference between BFS/DFS working or blowing up.
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1Balanced Binary Treeeasy