Implement two-pointer unique-pair sum search

Q: Implement two-pointer unique-pair sum search

This question evaluates proficiency with the two-pointer technique, sorted-array duplicate handling, in-place space constraints, and stream-processing considerations within the Coding & Algorithms domain for data scientist roles.

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Question

Given a nondecreasing integer array nums and an integer target, return all unique value pairs [a, b] with a <= b such that a + b == target. Use the two-pointer technique to achieve O(n) time and O(

extra space beyond the output, and ensure duplicates in nums do not produce duplicate pairs. Additionally: a) Describe how you would return indices instead of values and any implications for stability. b) Explain how you would adapt the method if nums arrives as a stream that cannot be fully stored in memory. c) Analyze time and space complexity.

Implement two-pointer unique-pair sum search

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