230. Kth Smallest Element in a BST

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Given the root of a binary search tree, and an integer k, return the kth smallest value (1-indexed) of all the values of the nodes in the tree. Example 1: Input: root = [3,1,4,null,2], k = 1 Output: 1 Example 2: Input: root = [5,3,6,2,4,null,null,1], k = 3 Output: 3 Constraints: - The number of nodes in the tree is n. - 1 <= k <= n <= 104 - 0 <= Node.val <= 104 Follow up: If the BST

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solution.cppC++17

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