#763Easy· asked at 4 companies
Invert Binary Tree
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What we know
Example 1
Input: root = [4,2,7,1,3,6,9] Output: [4,7,2,9,6,3,1]
Example 2
Input: root = [2,1,3] Output: [2,3,1]
Example 3
Input: root = [] Output: []
Constraints
- •
The number of nodes in the tree is in the range
[0, 100]. - •
-100 <= Node.val <= 100