BNSF Coding Round

This was the question for a Senior Software Engineer. The worst calibrated question I ever faced in an interview from a mid tier company.

You are a train dispatcher responsible for assembling the maximum number of valid trains from a pool of available locomotives and railcars. Your goal is to build as many trains as possible, and among

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Optimize for:
    1. PRIMARY   — maximize number of trains
    2. SECONDARY — maximize total combined length across all trains (up to 15,000 ft per train)