Invert/Flip Binary Tree
Invert a binary tree. Tags: Tree
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Solution
# Definition for a binary tree node.
# class TreeNode:
# def __init__(self, val=0, left=None, right=None):
# self.val = val
# self.left = left
# self.right = right
class Solution:
def invertTree(self, root: Optional[TreeNode]) -> Optional[TreeNode]:
if not root:
return
tmp_left = self.invertTree(root.right)
tmp_right = self.invertTree(root.left)
root.left = tmp_left
root.right = tmp_right
return root