653. Two Sum IV - Input is a BST

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Given the root of a binary search tree and an integer k, return true if there exist two elements in the BST such that their sum is equal to k, or false otherwise. Example 1: Input: root = [5,3,6,2,4,null,7], k = 9 Output: true Example 2: Input: root = [5,3,6,2,4,null,7], k = 28 Output: false Constraints: - The number of nodes in the tree is in the range [1, 104]. - -104 <= Node.val <= 1

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solution.cppC++17

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