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Solve for the Kth smallest element in a Binary Search Tree.

Python/Codingeasy0.5 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Expedia
Expert AnswerPremium
101 wordsInterview-ready
**Why BST Kth Smallest:** In-order traversal yields sorted order. kth smallest = kth node in in-order. Used in top-K from sorted structure, percentile queries. **Approach:** (1) In-order with counter: O(h + k) time. (2) Augmented BST: each node stores subtree size—O(h) search by comparing k with left size. **Scalability:** BST in-memory; for disk-backed (B-tree), similar logic....
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