Created
September 14, 2017 09:56
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538. Convert BST to Greater Tree
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| var sum int | |
| func convertBST(root *TreeNode) *TreeNode { | |
| if root == nil { | |
| return nil | |
| } | |
| sum = 0 | |
| traverse(root) | |
| return root | |
| } | |
| func traverse(root *TreeNode) { | |
| if root == nil { | |
| return | |
| } | |
| traverse(root.Right) | |
| root.Val += sum | |
| sum = root.Val | |
| traverse(root.Left) | |
| } |
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