DIY: Binary Search Tree Iterator

Solve the interview question "Binary Search Tree Iterator" in this lesson.

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Problem statement

In this challenge, you have to implement a binary search tree iterator class called BSTIterator. The iterator will be initialized by the root node of the BST. You have to implement two methods:

  • next(): This will return the next smallest number in the BST.
  • hasNext(): This will return true if the next smallest number exists in the tree.

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