FA-67615 / Elevator dispatch scheduling / Member archive

Up-peak round trip time: highest reversal floor · case 05

The highest reversal floor is one floor low or high.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Up-peak analysis with N floors above the lobby, P = 0.8*capacity passengers per trip (fractional), probable stops S = N(1-(1-1/N)^P), highest reversal floor H = N - sum_{i=1}^{N-1}(i/N)^P, RTT = 2*H*tv + (S+1)*ts + 2*P*tp, interval = RTT/cars and 5-minute handling capacity HC5 = 300*P*cars/RTT. Values rounded to 2 decimals.

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: tall office	`{"H": 18.0, "S": 9.63, "hc5": 123.96, "interval": 30.98, "rtt": 185.87}`	`{"H": 19.0, "S": 9.63, "hc5": 121.99, "interval": 31.48, "rtt": 188.87}`	Failed

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