give root Binary Search Tree BST convert Greater Tree key original BST change original key plus sum key great original key bsta reminder binary search tree tree satisfie constraintsthe leave subtree node contain node key node keythe right subtree node contain nod key great node keyBoth leave right subtree binary search tree Example 1input root 4160257nullnullnull3nullnullnull8Output 30362136352615nullnullnull33nullnullnull8example 2input root 0null1output 1null1 constraintsthe number nod tree range 1 1000 Nodeval 100all value tree unique Note this question 538 httpsleetcodecomproblemsconvertbsttogreatertree