FA-67488 / Elevator dispatch scheduling / Member archive

Idle car parking by zone: down-peak ordering · case 03

In down-peak the upper zones are left without cars.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

The building is split into zones of ceil(floors/zones) floors; each zone base floor is a parking target. Up-peak adds an extra lobby target first (lobby gets two cars); down-peak orders the bases from the top down; otherwise bases ascend. Each target in order takes the nearest free car (ties to the lowest car id); leftover targets stay empty.

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: down-peak top first	`{"C1": 10, "C2": 5, "C3": 0}`	`{"C1": 15, "C2": 10, "C3": 5}`	Failed

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