Created
July 6, 2022 01:58
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| class TreeNode(object): | |
| def __init__(self, val=0, left=None, right=None): | |
| self.val = val | |
| self.left = left | |
| self.right = right | |
| class Solution(object): | |
| def invert_tree(self, root): | |
| """ | |
| :type root: TreeNode | |
| :rtype: TreeNode | |
| """ | |
| if not root: | |
| return None | |
| left = root.left | |
| root.left = root.right | |
| root.right = left | |
| self.invert_tree(root.left) | |
| self.invert_tree(root.right) | |
| return root | |
| # Test cases | |
| sol = Solution() | |
| tree = TreeNode(4) | |
| tree.left = TreeNode(2) | |
| tree.right = TreeNode(7) | |
| tree.left.left = TreeNode(1) | |
| tree.left.right = TreeNode(3) | |
| tree.right.left = TreeNode(6) | |
| tree.right.right = TreeNode(9) | |
| inv_tree = sol.invert_tree(tree) | |
| assert inv_tree.val == 4 | |
| assert inv_tree.left.val == 7 | |
| assert inv_tree.right.val == 2 | |
| assert inv_tree.left.left.val == 9 | |
| assert inv_tree.left.right.val == 6 | |
| assert inv_tree.right.left.val == 3 | |
| assert inv_tree.right.right.val == 1 |
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