Given the root of a binary tree, invert the tree, and return its root.
Input: root = [4,2,7,1,3,6,9]
Output: [4,7,2,9,6,3,1]
Input: root = [2,1,3]
Output: [2,3,1]
Input: root = []
Output: []
0226.Invert-binary-tree
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