Web Reference: BSTIterator(TreeNode root) Initializes an object of the BSTIterator class. The root of the BST is given as part of the constructor. The pointer should be initialized to a non-existent number smaller than any element in the BST. In-depth solution and explanation for LeetCode 173. Binary Search Tree Iterator in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. BST iterator must return elements in ascending order, which requires inorder traversal (left, root, right). Using preorder or postorder traversal produces elements in the wrong order.
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