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Hospital code blue car selection: away cost · case 04

A car moving away is judged as close as a car heading to the call.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Only cars in normal mode can answer a code blue at floor call. An idle car or one moving towards (or at) the call floor costs the floor distance. A car moving away first runs to its turn floor (the extreme of its calls and its floor in its direction) and back: |turn-floor| + |turn-call|. Lowest cost wins, ties to the lowest id. The winner cancels its car calls (reported sorted) and announces if it carries passengers.

Why this case matters

Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: car moving down away	`{"announce": false, "cancelled_calls": [1, 6], "car": "H1"}`	`{"announce": false, "cancelled_calls": [], "car": "H2"}`	Failed

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