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Programming and Data Structures · Trees
Official IIT answer key · IIT Kanpur · Audited Aug 2026
GATE CSE 2015 Set 3 Q25 · NAT · 1 mark
Key concept
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Topic notes
In GATE CS, the 'Trees' topic tests structural counting relations in binary trees, tree traversal techniques (standard, custom, and multi-way tree traversals), tree reconstruction from sequences, expression tree evaluations, and recursive algorithms over binary/multi-way tree representations. Questions are heavily weighted towards 1-mark foundational items (both MCQ and NAT) with 2-mark questions focusing on code analysis or expression optimization.
Full Trees guide →Consider a binary tree T that has 200 leaf nodes. Then, the number of nodes in T that have exactly two children are …
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