538&1038. Convert BST to Greater Tree
https://leetcode.com/problems/convert-bst-to-greater-tree/
Input: root = [4,1,6,0,2,5,7,null,null,null,3,null,null,null,8]
Output: [30,36,21,36,35,26,15,null,null,null,33,null,null,null,8]Input: root = [0,null,1]
Output: [1,null,1]Input: root = [1,0,2]
Output: [3,3,2]Input: root = [3,2,4,1]
Output: [7,9,4,10]Solution:
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