{"abstract":"Waiting passengers are left behind at a floor where riders are getting out.","category":"Elevator dispatch scheduling","checks":8,"contract":"All passengers [id, from, to] wait at time 0. The car starts at start heading up. At each floor it first lets riders alight, then boards waiting passengers (in id order) whose travel direction equals the car direction while load < cap; any alighting or boarding costs one stop_s. If no rider destination or waiting origin lies strictly ahead it reverses in place (and may board again); otherwise it moves one floor (floor_s). Return {id: [board time, alight time]} for delivered passengers.","contract_signature":"x","evaluation_group":"w2-elevator_dispatch_scheduling-single-car-scan-simulation","failed_approach":"Snapshotting the load before alighting still counts the departing riders against capacity.","family":"w2-elevator_dispatch_scheduling-single-car-scan-simulation-alight-before-boarding","id":"FA-67761","implementations":{"attempt":{"sha256":"081d32eb8c8cd0d4deed7a318263aed7876b01f57263738a1d770cfac33a651f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    cap = x['cap']\n    pos = x['start']\n    t = 0\n    d = 'up'\n    waiting = {r[0]: r for r in x['requests']}\n    riding = {}\n    picked = {}\n    done = {}\n    for _ in range(400):\n        if not waiting and not riding:\n            break\n        stopped = False\n        load_before = len(riding)\n        for pid in sorted(riding):\n            if riding[pid][2] == pos:\n                done[pid] = [picked[pid], t]\n                del riding[pid]\n                stopped = True\n        for pid in sorted(waiting):\n            r = waiting[pid]\n            rdir = 'up' if r[2] > r[1] else 'down'\n            if r[1] == pos and rdir == d and load_before < cap:\n                riding[pid] = r\n                picked[pid] = t\n                del waiting[pid]\n                stopped = True\n        if stopped:\n            t += x['stop_s']\n        targets = [r[2] for r in riding.values()] + [r[1] for r in waiting.values()]\n        ahead = [f for f in targets if (f > pos if d == 'up' else f < pos)]\n        if not ahead:\n            d = 'down' if d == 'up' else 'up'\n            continue\n        pos += 1 if d == 'up' else -1\n        t += x['floor_s']\n    return done\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('boundary: capacity exactly reached', {'cap': 2, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 4], ['b', 0, 5], ['c', 0, 6]]}, {'a': [0, 13], 'b': [0, 20], 'c': [35, 52]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('boundary: two boardings share one stop', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 8, 'requests': [['a', 1, 4], ['b', 1, 4]]}, {'a': [0, 14], 'b': [0, 14]}), ('control 1', {'cap': 1, 'start': 5, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 6, 8], ['p1', 3, 7], ['p2', 0, 7], ['p3', 3, 2], ['p4', 7, 1]]}, {'p0': [2, 11], 'p4': [18, 35], 'p2': [42, 61], 'p3': [74, 81], 'p1': [88, 101]}), ('control 4', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 2, 8], ['p1', 8, 1], ['p2', 0, 8], ['p3', 5, 6]]}, {'p3': [13, 20], 'p0': [2, 29], 'p1': [34, 53], 'p2': [60, 81]}), ('control 7', {'cap': 4, 'start': 6, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 8, 9], ['p1', 7, 5], ['p2', 6, 0]]}, {'p0': [4, 11], 'p1': [20, 34], 'p2': [27, 49]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('boundary: capacity exactly reached', {'cap': 2, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 4], ['b', 0, 5], ['c', 0, 6]]}, {'a': [0, 13], 'b': [0, 20], 'c': [35, 52]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('control 28', {'cap': 2, 'start': 8, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 2, 5], ['p1', 0, 5], ['p2', 7, 1], ['p3', 5, 3], ['p4', 5, 0]]}, {'p3': [14, 26], 'p2': [2, 38], 'p0': [60, 74], 'p1': [48, 74], 'p4': [82, 100]}), ('boundary: two boardings share one stop', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 8, 'requests': [['a', 1, 4], ['b', 1, 4]]}, {'a': [0, 14], 'b': [0, 14]}), ('control 12', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 8, 3], ['p1', 8, 4], ['p2', 2, 8], ['p3', 5, 0], ['p4', 8, 2], ['p5', 7, 9]]}, {'p2': [0, 28], 'p5': [18, 38], 'p1': [48, 72], 'p0': [48, 82], 'p4': [48, 92], 'p3': [62, 104]}), ('control 15', {'cap': 2, 'start': 8, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 6, 3], ['p1', 4, 1], ['p2', 5, 0]]}, {'p0': [4, 26], 'p2': [14, 40], 'p1': [56, 70]}), ('control 18', {'cap': 4, 'start': 9, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 1, 0], ['p1', 7, 8], ['p2', 1, 8]]}, {'p0': [16, 26], 'p1': [56, 66], 'p2': [36, 66]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('sampled regression 69', {'cap': 2, 'start': 4, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 3, 9], ['p1', 8, 1], ['p2', 4, 8], ['p3', 4, 7], ['p4', 7, 8]]}, {'p3': [0, 14], 'p2': [0, 24], 'p4': [14, 24], 'p1': [32, 54], 'p0': [66, 86]}), ('boundary: alighting-only stop', {'cap': 4, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 2], ['b', 5, 6]]}, {'a': [0, 9], 'b': [20, 27]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('control 23', {'cap': 4, 'start': 8, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 9, 4], ['p1', 9, 1], ['p2', 0, 1], ['p3', 6, 2]]}, {'p0': [2, 22], 'p3': [13, 31], 'p1': [2, 38], 'p2': [45, 52]}), ('control 26', {'cap': 1, 'start': 3, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 0, 4], ['p1', 1, 6], ['p2', 1, 6], ['p3', 5, 1]]}, {'p3': [4, 20], 'p0': [30, 46], 'p1': [60, 78], 'p2': [96, 114]}), ('control 29', {'cap': 4, 'start': 5, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 8, 5], ['p1', 0, 2], ['p2', 7, 1]]}, {'p0': [6, 28], 'p2': [16, 44], 'p1': [54, 66]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('boundary: capacity exactly reached', {'cap': 2, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 4], ['b', 0, 5], ['c', 0, 6]]}, {'a': [0, 13], 'b': [0, 20], 'c': [35, 52]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('control 8', {'cap': 1, 'start': 7, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 4, 9], ['p1', 9, 3], ['p2', 9, 7], ['p3', 2, 1], ['p4', 1, 3]]}, {'p1': [4, 24], 'p3': [34, 44], 'p4': [52, 64], 'p0': [74, 92], 'p2': [100, 112]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('control 34', {'cap': 2, 'start': 4, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 2, 0], ['p1', 2, 8], ['p2', 6, 1], ['p3', 3, 7], ['p4', 6, 8], ['p5', 2, 4]]}, {'p4': [4, 13], 'p2': [22, 42], 'p0': [35, 49], 'p5': [58, 67], 'p1': [58, 80], 'p3': [95, 108]}), ('control 37', {'cap': 2, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 5, 9], ['p1', 6, 7]]}, {'p1': [13, 20], 'p0': [6, 29]}), ('control 43', {'cap': 4, 'start': 3, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 7, 4], ['p1', 2, 1], ['p2', 7, 5], ['p3', 5, 1]]}, {'p2': [8, 20], 'p0': [8, 30], 'p1': [42, 52], 'p3': [20, 52]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('boundary: two boardings share one stop', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 8, 'requests': [['a', 1, 4], ['b', 1, 4]]}, {'a': [0, 14], 'b': [0, 14]}), ('boundary: alighting-only stop', {'cap': 4, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 2], ['b', 5, 6]]}, {'a': [0, 9], 'b': [20, 27]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('control 45', {'cap': 4, 'start': 8, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 0, 2], ['p1', 6, 2], ['p2', 4, 5], ['p3', 1, 7], ['p4', 7, 4]]}, {'p4': [2, 18], 'p1': [9, 27], 'p0': [36, 50], 'p2': [59, 66], 'p3': [43, 75]}), ('control 48', {'cap': 2, 'start': 8, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 2, 0], ['p1', 0, 2], ['p2', 8, 5], ['p3', 6, 4], ['p4', 0, 3]]}, {'p2': [0, 16], 'p3': [9, 23], 'p0': [32, 41], 'p1': [46, 55], 'p4': [46, 62]}), ('control 51', {'cap': 4, 'start': 4, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 8, 9], ['p1', 2, 6], ['p2', 8, 1], ['p3', 1, 6], ['p4', 3, 1]]}, {'p0': [8, 15], 'p2': [22, 46], 'p4': [37, 46], 'p1': [58, 71], 'p3': [51, 71]})]]\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":"76145449cf7a1921cf7b826510ba76013d8922a5326e33001749314c1b9d30e1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    cap = x['cap']\n    pos = x['start']\n    t = 0\n    d = 'up'\n    waiting = {r[0]: r for r in x['requests']}\n    riding = {}\n    picked = {}\n    done = {}\n    for _ in range(400):\n        if not waiting and not riding:\n            break\n        stopped = False\n        for pid in sorted(waiting):\n            r = waiting[pid]\n            rdir = 'up' if r[2] > r[1] else 'down'\n            if r[1] == pos and rdir == d and len(riding) < cap:\n                riding[pid] = r\n                picked[pid] = t\n                del waiting[pid]\n                stopped = True\n        for pid in sorted(riding):\n            if riding[pid][2] == pos:\n                done[pid] = [picked[pid], t]\n                del riding[pid]\n                stopped = True\n        if stopped:\n            t += x['stop_s']\n        targets = [r[2] for r in riding.values()] + [r[1] for r in waiting.values()]\n        ahead = [f for f in targets if (f > pos if d == 'up' else f < pos)]\n        if not ahead:\n            d = 'down' if d == 'up' else 'up'\n            continue\n        pos += 1 if d == 'up' else -1\n        t += x['floor_s']\n    return done\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('boundary: capacity exactly reached', {'cap': 2, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 4], ['b', 0, 5], ['c', 0, 6]]}, {'a': [0, 13], 'b': [0, 20], 'c': [35, 52]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('boundary: two boardings share one stop', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 8, 'requests': [['a', 1, 4], ['b', 1, 4]]}, {'a': [0, 14], 'b': [0, 14]}), ('control 1', {'cap': 1, 'start': 5, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 6, 8], ['p1', 3, 7], ['p2', 0, 7], ['p3', 3, 2], ['p4', 7, 1]]}, {'p0': [2, 11], 'p4': [18, 35], 'p2': [42, 61], 'p3': [74, 81], 'p1': [88, 101]}), ('control 4', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 2, 8], ['p1', 8, 1], ['p2', 0, 8], ['p3', 5, 6]]}, {'p3': [13, 20], 'p0': [2, 29], 'p1': [34, 53], 'p2': [60, 81]}), ('control 7', {'cap': 4, 'start': 6, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 8, 9], ['p1', 7, 5], ['p2', 6, 0]]}, {'p0': [4, 11], 'p1': [20, 34], 'p2': [27, 49]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('boundary: capacity exactly reached', {'cap': 2, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 4], ['b', 0, 5], ['c', 0, 6]]}, {'a': [0, 13], 'b': [0, 20], 'c': [35, 52]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('control 28', {'cap': 2, 'start': 8, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 2, 5], ['p1', 0, 5], ['p2', 7, 1], ['p3', 5, 3], ['p4', 5, 0]]}, {'p3': [14, 26], 'p2': [2, 38], 'p0': [60, 74], 'p1': [48, 74], 'p4': [82, 100]}), ('boundary: two boardings share one stop', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 8, 'requests': [['a', 1, 4], ['b', 1, 4]]}, {'a': [0, 14], 'b': [0, 14]}), ('control 12', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 8, 3], ['p1', 8, 4], ['p2', 2, 8], ['p3', 5, 0], ['p4', 8, 2], ['p5', 7, 9]]}, {'p2': [0, 28], 'p5': [18, 38], 'p1': [48, 72], 'p0': [48, 82], 'p4': [48, 92], 'p3': [62, 104]}), ('control 15', {'cap': 2, 'start': 8, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 6, 3], ['p1', 4, 1], ['p2', 5, 0]]}, {'p0': [4, 26], 'p2': [14, 40], 'p1': [56, 70]}), ('control 18', {'cap': 4, 'start': 9, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 1, 0], ['p1', 7, 8], ['p2', 1, 8]]}, {'p0': [16, 26], 'p1': [56, 66], 'p2': [36, 66]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('sampled regression 69', {'cap': 2, 'start': 4, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 3, 9], ['p1', 8, 1], ['p2', 4, 8], ['p3', 4, 7], ['p4', 7, 8]]}, {'p3': [0, 14], 'p2': [0, 24], 'p4': [14, 24], 'p1': [32, 54], 'p0': [66, 86]}), ('boundary: alighting-only stop', {'cap': 4, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 2], ['b', 5, 6]]}, {'a': [0, 9], 'b': [20, 27]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('control 23', {'cap': 4, 'start': 8, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 9, 4], ['p1', 9, 1], ['p2', 0, 1], ['p3', 6, 2]]}, {'p0': [2, 22], 'p3': [13, 31], 'p1': [2, 38], 'p2': [45, 52]}), ('control 26', {'cap': 1, 'start': 3, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 0, 4], ['p1', 1, 6], ['p2', 1, 6], ['p3', 5, 1]]}, {'p3': [4, 20], 'p0': [30, 46], 'p1': [60, 78], 'p2': [96, 114]}), ('control 29', {'cap': 4, 'start': 5, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 8, 5], ['p1', 0, 2], ['p2', 7, 1]]}, {'p0': [6, 28], 'p2': [16, 44], 'p1': [54, 66]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('boundary: capacity exactly reached', {'cap': 2, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 4], ['b', 0, 5], ['c', 0, 6]]}, {'a': [0, 13], 'b': [0, 20], 'c': [35, 52]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('control 8', {'cap': 1, 'start': 7, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 4, 9], ['p1', 9, 3], ['p2', 9, 7], ['p3', 2, 1], ['p4', 1, 3]]}, {'p1': [4, 24], 'p3': [34, 44], 'p4': [52, 64], 'p0': [74, 92], 'p2': [100, 112]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('control 34', {'cap': 2, 'start': 4, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 2, 0], ['p1', 2, 8], ['p2', 6, 1], ['p3', 3, 7], ['p4', 6, 8], ['p5', 2, 4]]}, {'p4': [4, 13], 'p2': [22, 42], 'p0': [35, 49], 'p5': [58, 67], 'p1': [58, 80], 'p3': [95, 108]}), ('control 37', {'cap': 2, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 5, 9], ['p1', 6, 7]]}, {'p1': [13, 20], 'p0': [6, 29]}), ('control 43', {'cap': 4, 'start': 3, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 7, 4], ['p1', 2, 1], ['p2', 7, 5], ['p3', 5, 1]]}, {'p2': [8, 20], 'p0': [8, 30], 'p1': [42, 52], 'p3': [20, 52]})], [('regression: full car at a floor where a rider alights', {'cap': 1, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 3], ['b', 3, 6]]}, {'a': [0, 11], 'b': [11, 22]}), ('sampled regression 40', {'cap': 2, 'start': 6, 'floor_s': 2, 'stop_s': 8, 'requests': [['p0', 9, 5], ['p1', 8, 3], ['p2', 5, 4]]}, {'p0': [6, 30], 'p2': [30, 40], 'p1': [16, 50]}), ('boundary: two boardings share one stop', {'cap': 4, 'start': 1, 'floor_s': 2, 'stop_s': 8, 'requests': [['a', 1, 4], ['b', 1, 4]]}, {'a': [0, 14], 'b': [0, 14]}), ('boundary: alighting-only stop', {'cap': 4, 'start': 0, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 0, 2], ['b', 5, 6]]}, {'a': [0, 9], 'b': [20, 27]}), ('boundary: opposite-direction passenger waits', {'cap': 4, 'start': 2, 'floor_s': 2, 'stop_s': 5, 'requests': [['a', 2, 0], ['b', 2, 5]]}, {'b': [0, 11], 'a': [22, 31]}), ('control 45', {'cap': 4, 'start': 8, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 0, 2], ['p1', 6, 2], ['p2', 4, 5], ['p3', 1, 7], ['p4', 7, 4]]}, {'p4': [2, 18], 'p1': [9, 27], 'p0': [36, 50], 'p2': [59, 66], 'p3': [43, 75]}), ('control 48', {'cap': 2, 'start': 8, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 2, 0], ['p1', 0, 2], ['p2', 8, 5], ['p3', 6, 4], ['p4', 0, 3]]}, {'p2': [0, 16], 'p3': [9, 23], 'p0': [32, 41], 'p1': [46, 55], 'p4': [46, 62]}), ('control 51', {'cap': 4, 'start': 4, 'floor_s': 2, 'stop_s': 5, 'requests': [['p0', 8, 9], ['p1', 2, 6], ['p2', 8, 1], ['p3', 1, 6], ['p4', 3, 1]]}, {'p0': [8, 15], 'p2': [22, 46], 'p4': [37, 46], 'p1': [58, 71], 'p3': [51, 71]})]]\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":"Stipulated toy lift-control contract for a bounded teaching model; it makes no claim of conformance to any lift code or vendor dispatcher and omits real safety cases. 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-elevator_dispatch_scheduling-single-car-scan-simulation-alight-before-boarding","generated_at":"2026-09-29T14:47:55.913272+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.","root_cause":"Boarding is evaluated before the riders at this floor have alighted, so the car still looks full.","sha256":"df95f79860fbd405a388b22dfb161f0c465b550888f840cd486b589c10139b07","title":"Single car SCAN service simulation: alight before boarding · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":41.373,"exit_code":1,"observations":[{"actual":{"a":[0,11],"b":[16,27]},"check":"regression: full car at a floor where a rider alights","expected":{"a":[0,11],"b":[11,22]},"passed":false},{"actual":{"p0":[6,30],"p1":[16,42],"p2":[54,64]},"check":"sampled regression 40","expected":{"p0":[6,30],"p1":[16,50],"p2":[30,40]},"passed":false},{"actual":{"a":[0,13],"b":[0,20],"c":[0,27]},"check":"boundary: capacity exactly reached","expected":{"a":[0,13],"b":[0,20],"c":[35,52]},"passed":false},{"actual":{"a":[22,31],"b":[0,11]},"check":"boundary: opposite-direction passenger waits","expected":{"a":[22,31],"b":[0,11]},"passed":true},{"actual":{"a":[0,14],"b":[0,14]},"check":"boundary: two boardings share one stop","expected":{"a":[0,14],"b":[0,14]},"passed":true},{"actual":{"p0":[2,11],"p1":[88,101],"p2":[42,61],"p3":[74,81],"p4":[18,35]},"check":"control 1","expected":{"p0":[2,11],"p1":[88,101],"p2":[42,61],"p3":[74,81],"p4":[18,35]},"passed":true},{"actual":{"p0":[2,29],"p1":[34,53],"p2":[60,81],"p3":[13,20]},"check":"control 4","expected":{"p0":[2,29],"p1":[34,53],"p2":[60,81],"p3":[13,20]},"passed":true},{"actual":{"p0":[4,11],"p1":[20,34],"p2":[27,49]},"check":"control 7","expected":{"p0":[4,11],"p1":[20,34],"p2":[27,49]},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: full car at a floor where a rider alights\", \"actual\": {\"a\": [0, 11], \"b\": [16, 27]}, \"expected\": {\"a\": [0, 11], \"b\": [11, 22]}, \"passed\": false}, {\"check\": \"sampled regression 40\", \"actual\": {\"p0\": [6, 30], \"p1\": [16, 42], \"p2\": [54, 64]}, \"expected\": {\"p0\": [6, 30], \"p2\": [30, 40], \"p1\": [16, 50]}, \"passed\": false}, {\"check\": \"boundary: capacity exactly reached\", \"actual\": {\"a\": [0, 13], \"b\": [0, 20], \"c\": [0, 27]}, \"expected\": {\"a\": [0, 13], \"b\": [0, 20], \"c\": [35, 52]}, \"passed\": false}, {\"check\": \"boundary: opposite-direction passenger waits\", \"actual\": {\"b\": [0, 11], \"a\": [22, 31]}, \"expected\": {\"b\": [0, 11], \"a\": [22, 31]}, \"passed\": true}, {\"check\": \"boundary: two boardings share one stop\", \"actual\": {\"a\": [0, 14], \"b\": [0, 14]}, \"expected\": {\"a\": [0, 14], \"b\": [0, 14]}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"p0\": [2, 11], \"p4\": [18, 35], \"p2\": [42, 61], \"p3\": [74, 81], \"p1\": [88, 101]}, \"expected\": {\"p0\": [2, 11], \"p4\": [18, 35], \"p2\": [42, 61], \"p3\": [74, 81], \"p1\": [88, 101]}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"p3\": [13, 20], \"p0\": [2, 29], \"p1\": [34, 53], \"p2\": [60, 81]}, \"expected\": {\"p3\": [13, 20], \"p0\": [2, 29], \"p1\": [34, 53], \"p2\": [60, 81]}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"p0\": [4, 11], \"p1\": [20, 34], \"p2\": [27, 49]}, \"expected\": {\"p0\": [4, 11], \"p1\": [20, 34], \"p2\": [27, 49]}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.09,"exit_code":1,"observations":[{"actual":{"a":[0,11],"b":[16,27]},"check":"regression: full car at a floor where a rider alights","expected":{"a":[0,11],"b":[11,22]},"passed":false},{"actual":{"p0":[6,30],"p1":[16,42],"p2":[54,64]},"check":"sampled regression 40","expected":{"p0":[6,30],"p1":[16,50],"p2":[30,40]},"passed":false},{"actual":{"a":[0,13],"b":[0,20],"c":[35,52]},"check":"boundary: capacity exactly reached","expected":{"a":[0,13],"b":[0,20],"c":[35,52]},"passed":true},{"actual":{"a":[22,31],"b":[0,11]},"check":"boundary: opposite-direction passenger waits","expected":{"a":[22,31],"b":[0,11]},"passed":true},{"actual":{"a":[0,14],"b":[0,14]},"check":"boundary: two boardings share one stop","expected":{"a":[0,14],"b":[0,14]},"passed":true},{"actual":{"p0":[2,11],"p1":[88,101],"p2":[42,61],"p3":[74,81],"p4":[18,35]},"check":"control 1","expected":{"p0":[2,11],"p1":[88,101],"p2":[42,61],"p3":[74,81],"p4":[18,35]},"passed":true},{"actual":{"p0":[2,29],"p1":[34,53],"p2":[60,81],"p3":[13,20]},"check":"control 4","expected":{"p0":[2,29],"p1":[34,53],"p2":[60,81],"p3":[13,20]},"passed":true},{"actual":{"p0":[4,11],"p1":[20,34],"p2":[27,49]},"check":"control 7","expected":{"p0":[4,11],"p1":[20,34],"p2":[27,49]},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: full car at a floor where a rider alights\", \"actual\": {\"a\": [0, 11], \"b\": [16, 27]}, \"expected\": {\"a\": [0, 11], \"b\": [11, 22]}, \"passed\": false}, {\"check\": \"sampled regression 40\", \"actual\": {\"p0\": [6, 30], \"p1\": [16, 42], \"p2\": [54, 64]}, \"expected\": {\"p0\": [6, 30], \"p2\": [30, 40], \"p1\": [16, 50]}, \"passed\": false}, {\"check\": \"boundary: capacity exactly reached\", \"actual\": {\"a\": [0, 13], \"b\": [0, 20], \"c\": [35, 52]}, \"expected\": {\"a\": [0, 13], \"b\": [0, 20], \"c\": [35, 52]}, \"passed\": true}, {\"check\": \"boundary: opposite-direction passenger waits\", \"actual\": {\"b\": [0, 11], \"a\": [22, 31]}, \"expected\": {\"b\": [0, 11], \"a\": [22, 31]}, \"passed\": true}, {\"check\": \"boundary: two boardings share one stop\", \"actual\": {\"a\": [0, 14], \"b\": [0, 14]}, \"expected\": {\"a\": [0, 14], \"b\": [0, 14]}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"p0\": [2, 11], \"p4\": [18, 35], \"p2\": [42, 61], \"p3\": [74, 81], \"p1\": [88, 101]}, \"expected\": {\"p0\": [2, 11], \"p4\": [18, 35], \"p2\": [42, 61], \"p3\": [74, 81], \"p1\": [88, 101]}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"p3\": [13, 20], \"p0\": [2, 29], \"p1\": [34, 53], \"p2\": [60, 81]}, \"expected\": {\"p3\": [13, 20], \"p0\": [2, 29], \"p1\": [34, 53], \"p2\": [60, 81]}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"p0\": [4, 11], \"p1\": [20, 34], \"p2\": [27, 49]}, \"expected\": {\"p0\": [4, 11], \"p1\": [20, 34], \"p2\": [27, 49]}, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}