3-line plain python

  • 0
    # 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 root is not None:
                root.left, root.right = self.invertTree(root.right), self.invertTree(root.left)
            return root

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