FA-67514 / Elevator dispatch scheduling / Member archive
Car call registration and cancellation: nuisance limit · case 04
An empty car accepts a sixth call from a prankster, or legitimate calls are refused.
Case contract
Car buttons are processed in order. Pressing the current floor with doors open reopens the doors. Floors outside 0..floors-1 are invalid. Pressing an already registered floor cancels it, unless it is the only call (kept). With load under 20 kg, a new call is refused as nuisance once five calls are registered. Otherwise the call is registered. Return the sorted calls and the per-press log.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| regression: child presses every button | {"calls": [1, 2, 3, 4, 5, 6], "log": ["registered", "registered", "registered", "registered", "registered", "registered", "nuisance"]} | {"calls": [1, 2, 3, 4, 5], "log": ["registered", "registered", "registered", "registered", "registered", "nuisance", "nuisance"]} | Failed |
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