179. Invert Binary Tree
EasyTree
Given the root of a binary tree, invert the tree, and return its root.
Examples
Input: [4,2,7,1,3,6,9]
Output: [4,7,2,9,6,3,1]
Explanation: Every node's left and right children are swapped.
Constraints
- The number of nodes in the tree is in the range [0, 100].
- -100 <= Node.val <= 100
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