938. Range Sum of BST

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Given the root node of a binary search tree and two integers low and high, return the sum of values of all nodes with a value in the inclusive range [low, high]. Example 1: Input: root = [10,5,15,3,7,null,18], low = 7, high = 15 Output: 32 Explanation: Nodes 7, 10, and 15 are in the range [7, 15]. 7 + 10 + 15 = 32. Example 2: Input: root = [10,5,15,3,7,13,18,1,null,6], low = 6, high = 10 Out

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solution.cppC++17

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