Invert Binary Tree

Given a binary tree, invert it and return the new value. You may invert it in-place.

To "invert" a binary tree, switch the left subtree and the right subtree, and invert them both. Inverting an empty tree does nothing.

Input

  • tree: a binary tree that needs to be inverted.

Output

The inverted binary tree.

Examples

Example 1:

Input:

1tree = <See explanation>

Output: <See explanation>

Explanation:

Original tree:

Inverted tree:

Try it yourself

Solution

Title

Script

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

Contrary to popular belief, Lorem Ipsum is not simply random text.

1  >>> a = [1, 2, 3]
2  >>> a[-1]
3  3

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