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Programming and Data Structures · Binary Search Trees
Official IIT answer key · IIT Kanpur · Audited Aug 2026
GATE CSE 2015 Set 1 Q23 · MCQ · 1 mark
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Topic notes
Binary Search Trees (BSTs) in GATE CS test a balance of traversal mechanics, structural properties, worst-case vs. balanced-case complexities, and sequential insertion dynamics. Questions frequently test the fundamental invariant that an inorder traversal yields a strictly sorted sequence, enabling unique reconstruction from preorder or postorder alone. Recent years (2022–2026) show a noticeable shift toward structural constraints (complete BSTs, heap/array indexing, ancestor insertion order dependencies, and successor relationships).
Full Binary Search Trees guide →What are the worst-case complexities of insertion and deletion of a key in a binary search tree?
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