{"abstract":"A vehicle whose quantum expired immediately gets its port back, starving waiting vehicles.","category":"EV charging session scheduling","checks":7,"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.","contract_signature":"vehicles, ports, slots, quantum","evaluation_group":"w2-ev_charging_session_scheduling-round-robin-port-rotation","failed_approach":"Inserting behind only the first waiter still lets the preempted vehicle jump the line.","family":"w2-ev_charging_session_scheduling-round-robin-port-rotation-preempted-vehicle-queue-position","id":"FA-93076","implementations":{"attempt":{"sha256":"2ec7a0ee08f1fc826fcbc89e97f60721f4110ce06c9ef131523e1dd18adadab1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(vehicles, ports, slots, quantum):\n    queue = [[vid, need] for vid, need in vehicles if need > 0]\n    done = {vid: (0 if need <= 0 else None) for vid, need in vehicles}\n    active = []\n    timeline = []\n    for t in range(slots):\n        while len(active) < ports and queue:\n            v = queue.pop(0)\n            active.append([v[0], v[1], quantum])\n        timeline.append(sorted(a[0] for a in active))\n        nxt = []\n        for a in active:\n            a[1] -= 1\n            a[2] -= 1\n            if a[1] == 0:\n                done[a[0]] = t + 1\n            elif a[2] == 0:\n                queue.insert(1, [a[0], a[1]])\n            else:\n                nxt.append(a)\n        active = nxt\n    return [timeline, [[k, done[k]] for k in sorted(done)]]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 4], ['V1', 4], ['V2', 0], ['V3', 5], ['V4', 6], ['V5', 0]], 1, 9, 1],\n   [[['V0'], ['V1'], ['V3'], ['V4'], ['V0'], ['V1'], ['V3'], ['V4'], ['V0']],\n    [['V0', None], ['V1', None], ['V2', 0], ['V3', None], ['V4', None], ['V5', 0]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 3], ['V1', 5], ['V2', 3], ['V3', 4], ['V4', 4], ['V5', 4]], 1, 3, 1],\n   [[['V0'], ['V1'], ['V2']],\n    [['V0', None], ['V1', None], ['V2', None], ['V3', None], ['V4', None], ['V5', None]]]],\n  ['control 1', [[['V0', 1], ['V1', 4], ['V2', 6], ['V3', 2], ['V4', 5], ['V5', 5]], 1, 10, 2],\n   [[['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V3'], ['V3'], ['V4'], ['V4'], ['V5']],\n    [['V0', 1], ['V1', None], ['V2', None], ['V3', 7], ['V4', None], ['V5', None]]]],\n  ['control 2', [[['V0', 5], ['V1', 3], ['V2', 2]], 1, 6, 2],\n   [[['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2']], [['V0', None], ['V1', None], ['V2', 6]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 5], ['V1', 2], ['V2', 5], ['V3', 1], ['V4', 2], ['V5', 5]], 1, 12, 3],\n   [[['V0'], ['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V2'], ['V3'], ['V4'], ['V4'],\n     ['V5']],\n    [['V0', None], ['V1', 5], ['V2', None], ['V3', 9], ['V4', 11], ['V5', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 5], ['V1', 4], ['V2', 4], ['V3', 1], ['V4', 5], ['V5', 1]], 3, 12, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V3', 'V4', 'V5'],\n     ['V0', 'V1', 'V4'], ['V0', 'V2', 'V4'], ['V4'], ['V4'], [], [], [], []],\n    [['V0', 6], ['V1', 5], ['V2', 6], ['V3', 4], ['V4', 8], ['V5', 4]]]],\n  ['control 1', [[['V0', 1], ['V1', 6], ['V2', 6], ['V3', 1], ['V4', 1]], 1, 7, 3],\n   [[['V0'], ['V1'], ['V1'], ['V1'], ['V2'], ['V2'], ['V2']],\n    [['V0', 1], ['V1', None], ['V2', None], ['V3', None], ['V4', None]]]],\n  ['control 2', [[['V0', 2], ['V1', 2], ['V2', 3], ['V3', 0], ['V4', 4], ['V5', 3]], 1, 3, 3],\n   [[['V0'], ['V0'], ['V1']],\n    [['V0', 2], ['V1', None], ['V2', None], ['V3', 0], ['V4', None], ['V5', None]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 4], ['V1', 2], ['V2', 6], ['V3', 6], ['V4', 1], ['V5', 6]], 1, 10, 3],\n   [[['V0'], ['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V2'], ['V3'], ['V3']],\n    [['V0', None], ['V1', 5], ['V2', None], ['V3', None], ['V4', None], ['V5', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 4], ['V1', 0], ['V2', 3], ['V3', 1], ['V4', 0], ['V5', 4]], 2, 8, 2],\n   [[['V0', 'V2'], ['V0', 'V2'], ['V3', 'V5'], ['V0', 'V5'], ['V0', 'V2'], ['V5'], ['V5'], []],\n    [['V0', 5], ['V1', 0], ['V2', 5], ['V3', 3], ['V4', 0], ['V5', 7]]]],\n  ['control 1', [[['V0', 0], ['V1', 6], ['V2', 4]], 2, 7, 3],\n   [[['V1', 'V2'], ['V1', 'V2'], ['V1', 'V2'], ['V1', 'V2'], ['V1'], ['V1'], []],\n    [['V0', 0], ['V1', 6], ['V2', 4]]]],\n  ['control 2', [[['V0', 3], ['V1', 0]], 1, 3, 1],\n   [[['V0'], ['V0'], ['V0']], [['V0', 3], ['V1', 0]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position', [[['V0', 6], ['V1', 6]], 1, 3, 2],\n   [[['V0'], ['V0'], ['V1']], [['V0', None], ['V1', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 4], ['V1', 6], ['V2', 2], ['V3', 2], ['V4', 5]], 3, 5, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V3'], ['V0', 'V3', 'V4'], ['V1', 'V4']],\n    [['V0', 4], ['V1', None], ['V2', 2], ['V3', 4], ['V4', None]]]],\n  ['control 1', [[['V0', 2], ['V1', 3], ['V2', 6], ['V3', 6], ['V4', 1], ['V5', 3]], 3, 3, 2],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V3', 'V4', 'V5']],\n    [['V0', 2], ['V1', None], ['V2', None], ['V3', None], ['V4', 3], ['V5', None]]]],\n  ['control 2', [[['V0', 2], ['V1', 6], ['V2', 6]], 1, 10, 2],\n   [[['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V1'], ['V1'], ['V2'], ['V2']],\n    [['V0', 2], ['V1', None], ['V2', None]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 5], ['V1', 5], ['V2', 6], ['V3', 0], ['V4', 6]], 3, 8, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V4'],\n     ['V0', 'V1', 'V4'], ['V2', 'V4'], ['V2', 'V4'], ['V2', 'V4']],\n    [['V0', 5], ['V1', 5], ['V2', 8], ['V3', 0], ['V4', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 5], ['V1', 3], ['V2', 2], ['V3', 1], ['V4', 3]], 3, 3, 2],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V3', 'V4']],\n    [['V0', None], ['V1', None], ['V2', 2], ['V3', 3], ['V4', None]]]],\n  ['control 1', [[['V0', 4], ['V1', 3], ['V2', 4], ['V3', 5], ['V4', 6]], 3, 3, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V2']],\n    [['V0', None], ['V1', 3], ['V2', None], ['V3', None], ['V4', None]]]],\n  ['control 2', [[['V0', 4], ['V1', 0], ['V2', 0], ['V3', 4], ['V4', 2]], 1, 12, 1],\n   [[['V0'], ['V3'], ['V4'], ['V0'], ['V3'], ['V4'], ['V0'], ['V3'], ['V0'], ['V3'], [], []],\n    [['V0', 9], ['V1', 0], ['V2', 0], ['V3', 10], ['V4', 6]]]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"47d28ff1b5d756686f78f86ecc24cbf4cffd4b68c11857824ea912d84fb49068","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(vehicles, ports, slots, quantum):\n    queue = [[vid, need] for vid, need in vehicles if need > 0]\n    done = {vid: (0 if need <= 0 else None) for vid, need in vehicles}\n    active = []\n    timeline = []\n    for t in range(slots):\n        while len(active) < ports and queue:\n            v = queue.pop(0)\n            active.append([v[0], v[1], quantum])\n        timeline.append(sorted(a[0] for a in active))\n        nxt = []\n        for a in active:\n            a[1] -= 1\n            a[2] -= 1\n            if a[1] == 0:\n                done[a[0]] = t + 1\n            elif a[2] == 0:\n                queue.insert(0, [a[0], a[1]])\n            else:\n                nxt.append(a)\n        active = nxt\n    return [timeline, [[k, done[k]] for k in sorted(done)]]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 4], ['V1', 4], ['V2', 0], ['V3', 5], ['V4', 6], ['V5', 0]], 1, 9, 1],\n   [[['V0'], ['V1'], ['V3'], ['V4'], ['V0'], ['V1'], ['V3'], ['V4'], ['V0']],\n    [['V0', None], ['V1', None], ['V2', 0], ['V3', None], ['V4', None], ['V5', 0]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 3], ['V1', 5], ['V2', 3], ['V3', 4], ['V4', 4], ['V5', 4]], 1, 3, 1],\n   [[['V0'], ['V1'], ['V2']],\n    [['V0', None], ['V1', None], ['V2', None], ['V3', None], ['V4', None], ['V5', None]]]],\n  ['control 1', [[['V0', 1], ['V1', 4], ['V2', 6], ['V3', 2], ['V4', 5], ['V5', 5]], 1, 10, 2],\n   [[['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V3'], ['V3'], ['V4'], ['V4'], ['V5']],\n    [['V0', 1], ['V1', None], ['V2', None], ['V3', 7], ['V4', None], ['V5', None]]]],\n  ['control 2', [[['V0', 5], ['V1', 3], ['V2', 2]], 1, 6, 2],\n   [[['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2']], [['V0', None], ['V1', None], ['V2', 6]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 5], ['V1', 2], ['V2', 5], ['V3', 1], ['V4', 2], ['V5', 5]], 1, 12, 3],\n   [[['V0'], ['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V2'], ['V3'], ['V4'], ['V4'],\n     ['V5']],\n    [['V0', None], ['V1', 5], ['V2', None], ['V3', 9], ['V4', 11], ['V5', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 5], ['V1', 4], ['V2', 4], ['V3', 1], ['V4', 5], ['V5', 1]], 3, 12, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V3', 'V4', 'V5'],\n     ['V0', 'V1', 'V4'], ['V0', 'V2', 'V4'], ['V4'], ['V4'], [], [], [], []],\n    [['V0', 6], ['V1', 5], ['V2', 6], ['V3', 4], ['V4', 8], ['V5', 4]]]],\n  ['control 1', [[['V0', 1], ['V1', 6], ['V2', 6], ['V3', 1], ['V4', 1]], 1, 7, 3],\n   [[['V0'], ['V1'], ['V1'], ['V1'], ['V2'], ['V2'], ['V2']],\n    [['V0', 1], ['V1', None], ['V2', None], ['V3', None], ['V4', None]]]],\n  ['control 2', [[['V0', 2], ['V1', 2], ['V2', 3], ['V3', 0], ['V4', 4], ['V5', 3]], 1, 3, 3],\n   [[['V0'], ['V0'], ['V1']],\n    [['V0', 2], ['V1', None], ['V2', None], ['V3', 0], ['V4', None], ['V5', None]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 4], ['V1', 2], ['V2', 6], ['V3', 6], ['V4', 1], ['V5', 6]], 1, 10, 3],\n   [[['V0'], ['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V2'], ['V3'], ['V3']],\n    [['V0', None], ['V1', 5], ['V2', None], ['V3', None], ['V4', None], ['V5', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 4], ['V1', 0], ['V2', 3], ['V3', 1], ['V4', 0], ['V5', 4]], 2, 8, 2],\n   [[['V0', 'V2'], ['V0', 'V2'], ['V3', 'V5'], ['V0', 'V5'], ['V0', 'V2'], ['V5'], ['V5'], []],\n    [['V0', 5], ['V1', 0], ['V2', 5], ['V3', 3], ['V4', 0], ['V5', 7]]]],\n  ['control 1', [[['V0', 0], ['V1', 6], ['V2', 4]], 2, 7, 3],\n   [[['V1', 'V2'], ['V1', 'V2'], ['V1', 'V2'], ['V1', 'V2'], ['V1'], ['V1'], []],\n    [['V0', 0], ['V1', 6], ['V2', 4]]]],\n  ['control 2', [[['V0', 3], ['V1', 0]], 1, 3, 1],\n   [[['V0'], ['V0'], ['V0']], [['V0', 3], ['V1', 0]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position', [[['V0', 6], ['V1', 6]], 1, 3, 2],\n   [[['V0'], ['V0'], ['V1']], [['V0', None], ['V1', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 4], ['V1', 6], ['V2', 2], ['V3', 2], ['V4', 5]], 3, 5, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V3'], ['V0', 'V3', 'V4'], ['V1', 'V4']],\n    [['V0', 4], ['V1', None], ['V2', 2], ['V3', 4], ['V4', None]]]],\n  ['control 1', [[['V0', 2], ['V1', 3], ['V2', 6], ['V3', 6], ['V4', 1], ['V5', 3]], 3, 3, 2],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V3', 'V4', 'V5']],\n    [['V0', 2], ['V1', None], ['V2', None], ['V3', None], ['V4', 3], ['V5', None]]]],\n  ['control 2', [[['V0', 2], ['V1', 6], ['V2', 6]], 1, 10, 2],\n   [[['V0'], ['V0'], ['V1'], ['V1'], ['V2'], ['V2'], ['V1'], ['V1'], ['V2'], ['V2']],\n    [['V0', 2], ['V1', None], ['V2', None]]]]],\n [['boundary: vehicle needing nothing', [[['A', 0], ['B', 2]], 1, 3, 1],\n   [[['B'], ['B'], []], [['A', 0], ['B', 2]]]],\n  ['boundary: finishes exactly at quantum end', [[['A', 2], ['B', 2]], 1, 5, 2],\n   [[['A'], ['A'], ['B'], ['B'], []], [['A', 2], ['B', 4]]]],\n  ['boundary: more ports than vehicles', [[['A', 3]], 2, 4, 1],\n   [[['A'], ['A'], ['A'], []], [['A', 3]]]],\n  ['regression: preempted vehicle queue position',\n   [[['V0', 5], ['V1', 5], ['V2', 6], ['V3', 0], ['V4', 6]], 3, 8, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V4'],\n     ['V0', 'V1', 'V4'], ['V2', 'V4'], ['V2', 'V4'], ['V2', 'V4']],\n    [['V0', 5], ['V1', 5], ['V2', 8], ['V3', 0], ['V4', None]]]],\n  ['regression: preempted vehicle queue position (partial repair)',\n   [[['V0', 5], ['V1', 3], ['V2', 2], ['V3', 1], ['V4', 3]], 3, 3, 2],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V3', 'V4']],\n    [['V0', None], ['V1', None], ['V2', 2], ['V3', 3], ['V4', None]]]],\n  ['control 1', [[['V0', 4], ['V1', 3], ['V2', 4], ['V3', 5], ['V4', 6]], 3, 3, 3],\n   [[['V0', 'V1', 'V2'], ['V0', 'V1', 'V2'], ['V0', 'V1', 'V2']],\n    [['V0', None], ['V1', 3], ['V2', None], ['V3', None], ['V4', None]]]],\n  ['control 2', [[['V0', 4], ['V1', 0], ['V2', 0], ['V3', 4], ['V4', 2]], 1, 12, 1],\n   [[['V0'], ['V3'], ['V4'], ['V0'], ['V3'], ['V4'], ['V0'], ['V3'], ['V0'], ['V3'], [], []],\n    [['V0', 9], ['V1', 0], ['V2', 0], ['V3', 10], ['V4', 6]]]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Deterministic stipulated toy contract for teaching; no claim of conformance with any standard, vendor protocol or production controller. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-ev_charging_session_scheduling-round-robin-port-rotation-preempted-vehicle-queue-position","generated_at":"2026-09-29T14:51:51.767733+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"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.","root_cause":"Preempted vehicles are pushed to the front of the queue.","sha256":"3f4d3f507f6c925ebc8ff4e85595687cd43f094c1e450adc3f04f9306574a24f","title":"Round-robin port rotation: preempted vehicle queue position · case 01","variant":1,"variant_policy":"Five numbered 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