intermediateDSA — Trees & Graphs

Validate a Binary Search Tree (BST)

Tests whether you know the common mistake of only checking immediate children instead of the full valid range.

Ready to master this question?

Generate a complete walkthrough — background, the full answer in plain language, a working code example explained line by line, a real-world scenario, common mistakes, and how this same question gets asked in different ways.

Next Step

Continue to Find the median from a data stream — numbers keep arriving one at a time, and you must return the median at any point. →← Back to all Core Java questions