30 lines
1.2 KiB
Markdown
30 lines
1.2 KiB
Markdown
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Given the `root` of a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus the sum of all keys greater than the original key in BST.
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As a reminder, a _binary search tree_ is a tree that satisfies these constraints:
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* The left subtree of a node contains only nodes with keys **less than** the node's key.
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* The right subtree of a node contains only nodes with keys **greater than** the node's key.
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* Both the left and right subtrees must also be binary search trees.
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**Example 1:**
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Input: root = [4,1,6,0,2,5,7,null,null,null,3,null,null,null,8]
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Output: [30,36,21,36,35,26,15,null,null,null,33,null,null,null,8]
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**Example 2:**
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Input: root = [0,null,1]
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Output: [1,null,1]
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**Constraints:**
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* The number of nodes in the tree is in the range `[0, 104]`.
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* `-104 <= Node.val <= 104`
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* All the values in the tree are **unique**.
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* `root` is guaranteed to be a valid binary search tree.
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**Note:** This question is the same as 1038: [https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/](https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/)
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