Weighted Random Generator and Lottery Winners

Also reported as Random Pick with Weight (LeetCode 528)

CodingAmazonLast reported August 2026Medium Frequency
Reported
4× across candidate reports
First seen
January 2026
Last reported
August 2026
Reported outcome
mixed

Problem Overview

The round: a weighted random value generator, from four reports between January and August 2026 in three shapes. An internal-transfer coding round (January 2026) posted the prompt and its follow-up in Kotlin signatures. An L5 Applied Scientist onsite (March 2026) names LeetCode 528, Random Pick with Weight. Two other rounds…

  • 3 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.
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