easyBlind 75
Invert Binary Tree
Invert the binary tree and return its root Example: [4,2,7,1,3,6,9] => [4,7,2,9,6,3,1]
This is really about exploring a state space without revisiting the same work. 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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1Invert Binary Treeeasy
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