Two Sum: Unique Pairs, In-Flight Movies and 3Sum

CodingAmazonLast reported July 2026Medium Frequency

Reported: 4× across candidate reports
First seen: December 2025
Last reported: July 2026
Reported outcome: mixed

Problem Overview

The round: four reports, December 2025 to July 2026. An SDE II phone screen (May 2026) posted the prompt in English, quoted below, and lists the steps of the round. An internal-transfer coding round (March 2026) framed it as in-flight movies: recommend two movies whose lengths add up to exactly…

4 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
The rest of the problem statement — full requirements, constraints, and edge cases
Approach and trade-offs — what passing candidates did, and the mistakes that sink people

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Verified Source

Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.

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Technical claims, formulas, and scale numbers are reviewed against primary sources.

Interviewer Follow-ups

The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.