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3. Prove that any comparison-based algorithm for constructing a binary search tree from an arbitrary list...

3. Prove that any comparison-based algorithm for constructing a binary search tree from an arbitrary list of n elements takes Ω(n log n) time in the worst case.

Hint: Think about reducing the problem of sorting to performing a set of operations on a binary search tree.

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Answer #1

An inorder traversal of a binary search tree constructed from an arbitrary list of n elements prints out its keys in sorted order in theta (n) time. Thus, any comparison-based algorithm for constructing a binary search tree from a list of n elements should take omega (n lg n) time in the worst case. Assume otherwise. Then, we would have a comparison-based sorting algorithm that requires less than omega (n lg n) time.

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