Factory Cost Optimizer

Problem Overview

You are given a 3D array where each row (first dimension) represents a production step (or factory type), and each element within a row represents a candidate factory for that step. Each factory is described by two values: [cost, distance], where cost is the construction/production cost and distance is the…

• 5 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