Currency Exchange Rate Converter

CodingStripeLast reported November 2025Low Frequency
Reported
2× across candidate reports
First seen
August 2025
Last reported
November 2025
Reported outcome
unknown

Problem Overview

You are given a string of currency exchange rate pairs, e.g., "AUD:USD:0.7,AUD:JPY:100,USD:CAD:1.2" (or equivalently pairs like a:b=1:1.5, b:c=1:1.5). The problem is delivered in escalating parts: Part 1: Implement a direct exchange rate lookup function that, given a fromCurrency and toCurrency, returns the rate. Crucially, you must support reverse lookup: if…

  • 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.
Codex Fact-Checked
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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