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  • LeetCode – Binary Search Tree Iterator (Java)

    Binary Search Tree Iterator

    • Difficulty: Medium

    Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.

    Calling next() will return the next smallest number in the BST.

    Note: next() and hasNext() should run in average O(1) time and uses O(h) memory, where h is the height of the tree.


    In this post, we describe a stack based method to solve the Binary Search Tree Iterator problem in Java. This solution similar to the stack based in oder traversal of a binary search tree. 

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