05: Is it a valid binary search tree (BST) ?

Q. Write code test if a given tree is a binary search tree (i.e. BST)? A. A binary search tree (BST) is a binary tree where each node satisfies the following conditions: 1) key in any node is larger than…

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Arulkumaran Kumaraswamipillai

In 1999, I pivoted from mechanical engineering to become a self-taught Java expert. Over the past 19+ years, I have built a high-demand contracting career, delivering mission-critical solutions for 13+ top-tier organisations. With a proven track record that has generated over 130+ job offers, I help enterprises solve complex data challenges at scale.

Author of the book "Java/J2EE job interview companion", which sold 35,000+ copies on amazon.com & superseded by this site with 2000+ registered users.

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Latest posts by Arulkumaran Kumaraswamipillai (see all)

How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second) - April 17, 2026
00b: Python variable scopes, assigning types optionally and execution order interview Q&As - April 11, 2026
How to prepare for the Java job interviews? - January 3, 2026

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