Circular Buffer in C++, Then Single-Producer Multi-Consumer

Problem Overview

Two first-round interviews at Citadel Securities asked for a ring (circular) buffer: the first required the coding in C++, the second was for a C++ software engineer role. The page uses Python, and the method names are the page's. In the first (a 60-minute backend engineer phone screen), the task…

• 1 candidate-reported follow-up — 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