image.png
遍历一遍保存下来，然后再填进去是可以做的，但是这里可以直接递归来做
# Definition for a binary tree node.
# class TreeNode(object):
# def __init__(self, x):
# self.val = x
# self.left = None
# self.right = None
class Solution(object):
def invertTree(self, root):
"""
:type root: TreeNode
:rtype: TreeNode
"""
if not root: return root
l = self.invertTree(root.left)
r = self.invertTree(root.right)
root.left = r
root.right = l
return root
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