Created
October 14, 2022 05:58
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Reverse a binary tree to satisfy the ego of a L2 Google engineer
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| #!/usr/bin/env python3 | |
| # -*- coding: utf-8 -*- | |
| def reverse_tree(tree): | |
| if tree is None: | |
| return | |
| if tree.left is None and tree.right is None: | |
| return | |
| if tree.left is None: | |
| tree.left = tree.right | |
| tree.right = None | |
| reverse_tree(tree.left) | |
| elif tree.right is None: | |
| tree.right = tree.left | |
| tree.left = None | |
| reverse_tree(tree.right) | |
| else: | |
| tmp = tree.left | |
| tree.left = tree.right | |
| tree.right = tmp | |
| reverse_tree(tree.left) | |
| reverse_tree(tree.right) |
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