Shipping Routes

Problem Overview

You are given a list of input strings, each representing a shipping route in the format '{source}:{target}:{method}:{cost}' (e.g., 'US:UK:UPS:10'). Implement a series of functions (typically 3 parts, revealed one at a time) to query this data: Part 1: Given a source, target, and method, return the cost of that specific…

• 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