Easy · Trees
Flip tree
Given the root of a binary tree, mirror it in place by swapping the left and right children of every node, and return its root.
Examples
Example 1
[1,2,3,4,5,6,7]Output: [1,3,2,7,6,5,4]
Example 2
[4,2,7,1,3,6,9]Output: [4,7,2,9,6,3,1]
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