Translate/Validate HashMap Values with Nested Support

Problem Overview

The round is the first phone screen, an algorithm round, and it is one function the interviewer extends step by step. Three first-hand reports, and all three advanced past this round. One report says the screen is four questions of rising difficulty, the code does not have to run or…

• 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