Match Payment to Account with Tolerance

Problem Overview

You are given a list of user accounts in a credit card company's system (each account has some balance or outstanding amount) and a payment input. Your task is to determine which account the payment belongs to (i.e., which account the payment 'settles'). Follow-up 1: Payments may not exactly match…

• 2 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