Help with the approach of the question

#1

Please provide with a HINT for the question

#2

Hey @goyalvivek
We can do it using a single traversal. The idea is to use following BST property. If we do reverse Inorder traversal of BST, we get all nodes in decreasing order. We do reverse Inorder traversal and keep track of the sum of all nodes visited so far, we add this sum to every node.


This is the code for the same if you find any difficulty in understanding the code or approach at any point please ask.

#3

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