FA-93095 / EV charging session scheduling / Member archive

Round-robin port rotation: timeline membership · case 05

Timeline rows are in port order and differ between identical fleets.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

vehicles is [[id, need_slots]] in arrival order. Each slot, free ports are filled from the FIFO queue; a vehicle holds its port for quantum slots or until done, then goes to the back of the queue. Return [timeline of sorted charging ids per slot, [[id, finish]] sorted by id] where finish is the slot index after its last charging slot, 0 when nothing was needed, None if unfinished.

Why this case matters

Depot, workplace and public EV chargers schedule sessions against prices, circuit limits and departure deadlines; a wrong decision silently strands a driver or overloads a feeder.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: timeline membership	`[[["V0", "V1", "V2"], ["V0", "V1", "V2"], ["V0", "V1", "V2"], ["V4", "V0", "V1"], ["V4", "V0", "V1"], ["V4", "V2"], ["V2", "V4"], ["V2", "V4"]], [["V0", 5], ["V1", 5], ["V2", 8], ["V3", 0], ["V4", null]]]`	`[[["V0", "V1", "V2"], ["V0", "V1", "V2"], ["V0", "V1", "V2"], ["V0", "V1", "V4"], ["V0", "V1", "V4"], ["V2", "V4"], ["V2", "V4"], ["V2", "V4"]], [["V0", 5], ["V1", 5], ["V2", 8], ["V3", 0], ["V4", null]]]`	Failed

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