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FA-67506 / Elevator dispatch scheduling / Open access

Car call registration and cancellation: double press cancel · case 01

The last remaining call is cancelled by a double press, or earlier calls cannot be cancelled.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The only remaining call can be cancelled.

VERIFIED REPAIR

Cancel on a repeat press unless it is the only call.

Unsuccessful approach: Cancelling only the most recent call ignores repeat presses of earlier calls.

Case contract

Car buttons are processed in order. Pressing the current floor with doors open reopens the doors. Floors outside 0..floors-1 are invalid. Pressing an already registered floor cancels it, unless it is the only call (kept). With load under 20 kg, a new call is refused as nuisance once five calls are registered. Otherwise the call is registered. Return the sorted calls and the per-press log.

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.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    calls = []
    log = []
    for f in x['presses']:
        if f == x['floor'] and x['doors_open']:
            log.append('reopen')
        elif f < 0 or f >= x['floors']:
            log.append('invalid')
        elif f in calls:
            if len(calls) >= 1:
                calls.remove(f)
                log.append('cancelled')
            else:
                log.append('kept')
        elif x['load_kg'] < 20 and len(calls) >= 5:
            log.append('nuisance')
        else:
            calls.append(f)
            log.append('registered')
    return {'calls': sorted(calls), 'log': log}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 5', {'floors': 11, 'floor': 1, 'doors_open': True, 'load_kg': 15, 'presses': [10, 10, 8]}, {'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('boundary: own floor with doors closed', {'floors': 10, 'floor': 4, 'doors_open': False, 'load_kg': 80, 'presses': [4, 6]}, {'calls': [4, 6], 'log': ['registered', 'registered']}), ('sampled regression 1', {'floors': 12, 'floor': 6, 'doors_open': True, 'load_kg': 19, 'presses': [7, 7, -1, 8, 7]}, {'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}), ('control 4', {'floors': 7, 'floor': 6, 'doors_open': False, 'load_kg': 19, 'presses': [0, 6, 6, 6, 4, 6]}, {'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}), ('control 7', {'floors': 7, 'floor': 1, 'doors_open': False, 'load_kg': 19, 'presses': [2, 0, 2, 5, 4, 6]}, {'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('sampled regression 67', {'floors': 11, 'floor': 4, 'doors_open': False, 'load_kg': 80, 'presses': [4, 4, 0, 0, 9, 6, 2, 3, 9]}, {'calls': [2, 3, 4, 6], 'log': ['registered', 'kept', 'registered', 'cancelled', 'registered', 'registered', 'registered', 'registered', 'cancelled']}), ('control 15', {'floors': 12, 'floor': 10, 'doors_open': False, 'load_kg': 21, 'presses': [10, 4, 1, 4, 5, 6]}, {'calls': [1, 5, 6, 10], 'log': ['registered', 'registered', 'registered', 'cancelled', 'registered', 'registered']}), ('boundary: basement button that does not exist', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [-1, 3]}, {'calls': [3], 'log': ['invalid', 'registered']}), ('control 12', {'floors': 13, 'floor': 5, 'doors_open': True, 'load_kg': 21, 'presses': [2, 3, 11]}, {'calls': [2, 3, 11], 'log': ['registered', 'registered', 'registered']}), ('control 18', {'floors': 9, 'floor': 4, 'doors_open': True, 'load_kg': 19, 'presses': [3, 0, 5, 2, 7, 7, -1, 0]}, {'calls': [2, 3, 5], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'cancelled', 'invalid', 'cancelled']}), ('control 21', {'floors': 15, 'floor': 0, 'doors_open': True, 'load_kg': 19, 'presses': [7, 14, 5, 9]}, {'calls': [5, 7, 9, 14], 'log': ['registered', 'registered', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 24', {'floors': 10, 'floor': 8, 'doors_open': False, 'load_kg': 15, 'presses': [10, 5, 5, 2]}, {'calls': [2, 5], 'log': ['invalid', 'registered', 'kept', 'registered']}), ('control 28', {'floors': 11, 'floor': 4, 'doors_open': True, 'load_kg': 21, 'presses': [9, 7, 9, 4, 10, 1, -1, 10]}, {'calls': [1, 7], 'log': ['registered', 'registered', 'cancelled', 'reopen', 'registered', 'registered', 'invalid', 'cancelled']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('control 23', {'floors': 14, 'floor': 2, 'doors_open': False, 'load_kg': 15, 'presses': [2, 14, 1, 0, -1, 14, 5, 13]}, {'calls': [0, 1, 2, 5, 13], 'log': ['registered', 'invalid', 'registered', 'registered', 'invalid', 'invalid', 'registered', 'registered']}), ('control 26', {'floors': 10, 'floor': 9, 'doors_open': True, 'load_kg': 15, 'presses': [2, 4, 5, 9, 6, 1, 7, 9]}, {'calls': [1, 2, 4, 5, 6], 'log': ['registered', 'registered', 'registered', 'reopen', 'registered', 'registered', 'nuisance', 'reopen']}), ('control 29', {'floors': 10, 'floor': 8, 'doors_open': False, 'load_kg': 20, 'presses': [10, 0, 1]}, {'calls': [0, 1], 'log': ['invalid', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('sampled regression 71', {'floors': 13, 'floor': 9, 'doors_open': True, 'load_kg': 300, 'presses': [12, 12, 1, 5]}, {'calls': [1, 5, 12], 'log': ['registered', 'kept', 'registered', 'registered']}), ('control 46', {'floors': 10, 'floor': 3, 'doors_open': True, 'load_kg': 80, 'presses': [0, 9, 4, 7, 3, 6, 9, 7, 9]}, {'calls': [0, 4, 6, 9], 'log': ['registered', 'registered', 'registered', 'registered', 'reopen', 'registered', 'cancelled', 'cancelled', 'registered']}), ('boundary: child presses every button', {'floors': 12, 'floor': 0, 'doors_open': False, 'load_kg': 15, 'presses': [1, 2, 3, 4, 5, 6, 7]}, {'calls': [1, 2, 3, 4, 5], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'nuisance', 'nuisance']}), ('control 34', {'floors': 11, 'floor': 9, 'doors_open': False, 'load_kg': 0, 'presses': [10, 0, 5, 6, 0, 5, 9, 10, 9]}, {'calls': [6], 'log': ['registered', 'registered', 'registered', 'registered', 'cancelled', 'cancelled', 'registered', 'cancelled', 'cancelled']}), ('control 37', {'floors': 10, 'floor': 7, 'doors_open': True, 'load_kg': 80, 'presses': [10, 0, -1, -1, 5]}, {'calls': [0, 5], 'log': ['invalid', 'registered', 'invalid', 'invalid', 'registered']}), ('control 40', {'floors': 13, 'floor': 0, 'doors_open': True, 'load_kg': 15, 'presses': [0, -1, 8, 3]}, {'calls': [3, 8], 'log': ['reopen', 'invalid', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 27', {'floors': 8, 'floor': 4, 'doors_open': False, 'load_kg': 300, 'presses': [0, 0, 4, -1, 6, 8]}, {'calls': [0, 4, 6], 'log': ['registered', 'kept', 'registered', 'invalid', 'registered', 'invalid']}), ('control 66', {'floors': 9, 'floor': 2, 'doors_open': True, 'load_kg': 300, 'presses': [8, 2, 6, 8]}, {'calls': [6], 'log': ['registered', 'reopen', 'registered', 'cancelled']}), ('boundary: exactly twenty kilograms', {'floors': 12, 'floor': 0, 'doors_open': False, 'load_kg': 20, 'presses': [1, 2, 3, 4, 5, 6]}, {'calls': [1, 2, 3, 4, 5, 6], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'registered']}), ('control 45', {'floors': 10, 'floor': 6, 'doors_open': False, 'load_kg': 20, 'presses': [10, 9, 0, 0, 5, 7, 2, 3, 3]}, {'calls': [2, 5, 7, 9], 'log': ['invalid', 'registered', 'registered', 'cancelled', 'registered', 'registered', 'registered', 'registered', 'cancelled']}), ('control 48', {'floors': 10, 'floor': 2, 'doors_open': False, 'load_kg': 0, 'presses': [6, 10, 7, 2, 7, 4, 9]}, {'calls': [2, 4, 6, 9], 'log': ['registered', 'invalid', 'registered', 'registered', 'cancelled', 'registered', 'registered']}), ('control 51', {'floors': 15, 'floor': 9, 'doors_open': True, 'load_kg': 21, 'presses': [13, 6, 9, 10, 9]}, {'calls': [6, 10, 13], 'log': ['registered', 'registered', 'reopen', 'registered', 'reopen']})]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: double press of the only call{'calls': [], 'log': ['registered', 'cancelled']}{'calls': [3], 'log': ['registered', 'kept']}Failed
boundary: double press cancels{'calls': [5], 'log': ['registered', 'registered', 'cancelled']}{'calls': [5], 'log': ['registered', 'registered', 'cancelled']}Passed
sampled regression 5{'calls': [8], 'log': ['registered', 'cancelled', 'registered']}{'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}Failed
boundary: cancel an earlier call{'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}{'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}Passed
boundary: own floor with doors closed{'calls': [4, 6], 'log': ['registered', 'registered']}{'calls': [4, 6], 'log': ['registered', 'registered']}Passed
sampled regression 1{'calls': [7, 8], 'log': ['registered', 'cancelled', 'invalid', 'registered', 'registered']}{'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}Failed
control 4{'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}{'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}Passed
control 7{'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']}{'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']}Passed

SHA-256 / 8897794594dec959c8234cd9f82fe2f2fd9b89c57a1c01db53bdce064038373f

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    calls = []
    log = []
    for f in x['presses']:
        if f == x['floor'] and x['doors_open']:
            log.append('reopen')
        elif f < 0 or f >= x['floors']:
            log.append('invalid')
        elif f in calls:
            if len(calls) > 1 and calls[-1] == f:
                calls.remove(f)
                log.append('cancelled')
            else:
                log.append('kept')
        elif x['load_kg'] < 20 and len(calls) >= 5:
            log.append('nuisance')
        else:
            calls.append(f)
            log.append('registered')
    return {'calls': sorted(calls), 'log': log}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 5', {'floors': 11, 'floor': 1, 'doors_open': True, 'load_kg': 15, 'presses': [10, 10, 8]}, {'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('boundary: own floor with doors closed', {'floors': 10, 'floor': 4, 'doors_open': False, 'load_kg': 80, 'presses': [4, 6]}, {'calls': [4, 6], 'log': ['registered', 'registered']}), ('sampled regression 1', {'floors': 12, 'floor': 6, 'doors_open': True, 'load_kg': 19, 'presses': [7, 7, -1, 8, 7]}, {'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}), ('control 4', {'floors': 7, 'floor': 6, 'doors_open': False, 'load_kg': 19, 'presses': [0, 6, 6, 6, 4, 6]}, {'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}), ('control 7', {'floors': 7, 'floor': 1, 'doors_open': False, 'load_kg': 19, 'presses': [2, 0, 2, 5, 4, 6]}, {'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('sampled regression 67', {'floors': 11, 'floor': 4, 'doors_open': False, 'load_kg': 80, 'presses': [4, 4, 0, 0, 9, 6, 2, 3, 9]}, {'calls': [2, 3, 4, 6], 'log': ['registered', 'kept', 'registered', 'cancelled', 'registered', 'registered', 'registered', 'registered', 'cancelled']}), ('control 15', {'floors': 12, 'floor': 10, 'doors_open': False, 'load_kg': 21, 'presses': [10, 4, 1, 4, 5, 6]}, {'calls': [1, 5, 6, 10], 'log': ['registered', 'registered', 'registered', 'cancelled', 'registered', 'registered']}), ('boundary: basement button that does not exist', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [-1, 3]}, {'calls': [3], 'log': ['invalid', 'registered']}), ('control 12', {'floors': 13, 'floor': 5, 'doors_open': True, 'load_kg': 21, 'presses': [2, 3, 11]}, {'calls': [2, 3, 11], 'log': ['registered', 'registered', 'registered']}), ('control 18', {'floors': 9, 'floor': 4, 'doors_open': True, 'load_kg': 19, 'presses': [3, 0, 5, 2, 7, 7, -1, 0]}, {'calls': [2, 3, 5], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'cancelled', 'invalid', 'cancelled']}), ('control 21', {'floors': 15, 'floor': 0, 'doors_open': True, 'load_kg': 19, 'presses': [7, 14, 5, 9]}, {'calls': [5, 7, 9, 14], 'log': ['registered', 'registered', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 24', {'floors': 10, 'floor': 8, 'doors_open': False, 'load_kg': 15, 'presses': [10, 5, 5, 2]}, {'calls': [2, 5], 'log': ['invalid', 'registered', 'kept', 'registered']}), ('control 28', {'floors': 11, 'floor': 4, 'doors_open': True, 'load_kg': 21, 'presses': [9, 7, 9, 4, 10, 1, -1, 10]}, {'calls': [1, 7], 'log': ['registered', 'registered', 'cancelled', 'reopen', 'registered', 'registered', 'invalid', 'cancelled']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('control 23', {'floors': 14, 'floor': 2, 'doors_open': False, 'load_kg': 15, 'presses': [2, 14, 1, 0, -1, 14, 5, 13]}, {'calls': [0, 1, 2, 5, 13], 'log': ['registered', 'invalid', 'registered', 'registered', 'invalid', 'invalid', 'registered', 'registered']}), ('control 26', {'floors': 10, 'floor': 9, 'doors_open': True, 'load_kg': 15, 'presses': [2, 4, 5, 9, 6, 1, 7, 9]}, {'calls': [1, 2, 4, 5, 6], 'log': ['registered', 'registered', 'registered', 'reopen', 'registered', 'registered', 'nuisance', 'reopen']}), ('control 29', {'floors': 10, 'floor': 8, 'doors_open': False, 'load_kg': 20, 'presses': [10, 0, 1]}, {'calls': [0, 1], 'log': ['invalid', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('sampled regression 71', {'floors': 13, 'floor': 9, 'doors_open': True, 'load_kg': 300, 'presses': [12, 12, 1, 5]}, {'calls': [1, 5, 12], 'log': ['registered', 'kept', 'registered', 'registered']}), ('control 46', {'floors': 10, 'floor': 3, 'doors_open': True, 'load_kg': 80, 'presses': [0, 9, 4, 7, 3, 6, 9, 7, 9]}, {'calls': [0, 4, 6, 9], 'log': ['registered', 'registered', 'registered', 'registered', 'reopen', 'registered', 'cancelled', 'cancelled', 'registered']}), ('boundary: child presses every button', {'floors': 12, 'floor': 0, 'doors_open': False, 'load_kg': 15, 'presses': [1, 2, 3, 4, 5, 6, 7]}, {'calls': [1, 2, 3, 4, 5], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'nuisance', 'nuisance']}), ('control 34', {'floors': 11, 'floor': 9, 'doors_open': False, 'load_kg': 0, 'presses': [10, 0, 5, 6, 0, 5, 9, 10, 9]}, {'calls': [6], 'log': ['registered', 'registered', 'registered', 'registered', 'cancelled', 'cancelled', 'registered', 'cancelled', 'cancelled']}), ('control 37', {'floors': 10, 'floor': 7, 'doors_open': True, 'load_kg': 80, 'presses': [10, 0, -1, -1, 5]}, {'calls': [0, 5], 'log': ['invalid', 'registered', 'invalid', 'invalid', 'registered']}), ('control 40', {'floors': 13, 'floor': 0, 'doors_open': True, 'load_kg': 15, 'presses': [0, -1, 8, 3]}, {'calls': [3, 8], 'log': ['reopen', 'invalid', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 27', {'floors': 8, 'floor': 4, 'doors_open': False, 'load_kg': 300, 'presses': [0, 0, 4, -1, 6, 8]}, {'calls': [0, 4, 6], 'log': ['registered', 'kept', 'registered', 'invalid', 'registered', 'invalid']}), ('control 66', {'floors': 9, 'floor': 2, 'doors_open': True, 'load_kg': 300, 'presses': [8, 2, 6, 8]}, {'calls': [6], 'log': ['registered', 'reopen', 'registered', 'cancelled']}), ('boundary: exactly twenty kilograms', {'floors': 12, 'floor': 0, 'doors_open': False, 'load_kg': 20, 'presses': [1, 2, 3, 4, 5, 6]}, {'calls': [1, 2, 3, 4, 5, 6], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'registered']}), ('control 45', {'floors': 10, 'floor': 6, 'doors_open': False, 'load_kg': 20, 'presses': [10, 9, 0, 0, 5, 7, 2, 3, 3]}, {'calls': [2, 5, 7, 9], 'log': ['invalid', 'registered', 'registered', 'cancelled', 'registered', 'registered', 'registered', 'registered', 'cancelled']}), ('control 48', {'floors': 10, 'floor': 2, 'doors_open': False, 'load_kg': 0, 'presses': [6, 10, 7, 2, 7, 4, 9]}, {'calls': [2, 4, 6, 9], 'log': ['registered', 'invalid', 'registered', 'registered', 'cancelled', 'registered', 'registered']}), ('control 51', {'floors': 15, 'floor': 9, 'doors_open': True, 'load_kg': 21, 'presses': [13, 6, 9, 10, 9]}, {'calls': [6, 10, 13], 'log': ['registered', 'registered', 'reopen', 'registered', 'reopen']})]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: double press of the only call{'calls': [3], 'log': ['registered', 'kept']}{'calls': [3], 'log': ['registered', 'kept']}Passed
boundary: double press cancels{'calls': [3, 5], 'log': ['registered', 'registered', 'kept']}{'calls': [5], 'log': ['registered', 'registered', 'cancelled']}Failed
sampled regression 5{'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}{'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}Passed
boundary: cancel an earlier call{'calls': [3, 5, 7], 'log': ['registered', 'registered', 'registered', 'kept']}{'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}Failed
boundary: own floor with doors closed{'calls': [4, 6], 'log': ['registered', 'registered']}{'calls': [4, 6], 'log': ['registered', 'registered']}Passed
sampled regression 1{'calls': [7, 8], 'log': ['registered', 'kept', 'invalid', 'registered', 'kept']}{'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}Failed
control 4{'calls': [0, 4, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'kept']}{'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}Failed
control 7{'calls': [0, 2, 4, 5, 6], 'log': ['registered', 'registered', 'kept', 'registered', 'registered', 'registered']}{'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']}Failed

SHA-256 / 9feb60aebd1dee6bd68c8235ec6b7d65cce852fbc41f84a3c131b0ff27505076

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    calls = []
    log = []
    for f in x['presses']:
        if f == x['floor'] and x['doors_open']:
            log.append('reopen')
        elif f < 0 or f >= x['floors']:
            log.append('invalid')
        elif f in calls:
            if len(calls) > 1:
                calls.remove(f)
                log.append('cancelled')
            else:
                log.append('kept')
        elif x['load_kg'] < 20 and len(calls) >= 5:
            log.append('nuisance')
        else:
            calls.append(f)
            log.append('registered')
    return {'calls': sorted(calls), 'log': log}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 5', {'floors': 11, 'floor': 1, 'doors_open': True, 'load_kg': 15, 'presses': [10, 10, 8]}, {'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('boundary: own floor with doors closed', {'floors': 10, 'floor': 4, 'doors_open': False, 'load_kg': 80, 'presses': [4, 6]}, {'calls': [4, 6], 'log': ['registered', 'registered']}), ('sampled regression 1', {'floors': 12, 'floor': 6, 'doors_open': True, 'load_kg': 19, 'presses': [7, 7, -1, 8, 7]}, {'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}), ('control 4', {'floors': 7, 'floor': 6, 'doors_open': False, 'load_kg': 19, 'presses': [0, 6, 6, 6, 4, 6]}, {'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}), ('control 7', {'floors': 7, 'floor': 1, 'doors_open': False, 'load_kg': 19, 'presses': [2, 0, 2, 5, 4, 6]}, {'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('sampled regression 67', {'floors': 11, 'floor': 4, 'doors_open': False, 'load_kg': 80, 'presses': [4, 4, 0, 0, 9, 6, 2, 3, 9]}, {'calls': [2, 3, 4, 6], 'log': ['registered', 'kept', 'registered', 'cancelled', 'registered', 'registered', 'registered', 'registered', 'cancelled']}), ('control 15', {'floors': 12, 'floor': 10, 'doors_open': False, 'load_kg': 21, 'presses': [10, 4, 1, 4, 5, 6]}, {'calls': [1, 5, 6, 10], 'log': ['registered', 'registered', 'registered', 'cancelled', 'registered', 'registered']}), ('boundary: basement button that does not exist', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [-1, 3]}, {'calls': [3], 'log': ['invalid', 'registered']}), ('control 12', {'floors': 13, 'floor': 5, 'doors_open': True, 'load_kg': 21, 'presses': [2, 3, 11]}, {'calls': [2, 3, 11], 'log': ['registered', 'registered', 'registered']}), ('control 18', {'floors': 9, 'floor': 4, 'doors_open': True, 'load_kg': 19, 'presses': [3, 0, 5, 2, 7, 7, -1, 0]}, {'calls': [2, 3, 5], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'cancelled', 'invalid', 'cancelled']}), ('control 21', {'floors': 15, 'floor': 0, 'doors_open': True, 'load_kg': 19, 'presses': [7, 14, 5, 9]}, {'calls': [5, 7, 9, 14], 'log': ['registered', 'registered', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 24', {'floors': 10, 'floor': 8, 'doors_open': False, 'load_kg': 15, 'presses': [10, 5, 5, 2]}, {'calls': [2, 5], 'log': ['invalid', 'registered', 'kept', 'registered']}), ('control 28', {'floors': 11, 'floor': 4, 'doors_open': True, 'load_kg': 21, 'presses': [9, 7, 9, 4, 10, 1, -1, 10]}, {'calls': [1, 7], 'log': ['registered', 'registered', 'cancelled', 'reopen', 'registered', 'registered', 'invalid', 'cancelled']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('control 23', {'floors': 14, 'floor': 2, 'doors_open': False, 'load_kg': 15, 'presses': [2, 14, 1, 0, -1, 14, 5, 13]}, {'calls': [0, 1, 2, 5, 13], 'log': ['registered', 'invalid', 'registered', 'registered', 'invalid', 'invalid', 'registered', 'registered']}), ('control 26', {'floors': 10, 'floor': 9, 'doors_open': True, 'load_kg': 15, 'presses': [2, 4, 5, 9, 6, 1, 7, 9]}, {'calls': [1, 2, 4, 5, 6], 'log': ['registered', 'registered', 'registered', 'reopen', 'registered', 'registered', 'nuisance', 'reopen']}), ('control 29', {'floors': 10, 'floor': 8, 'doors_open': False, 'load_kg': 20, 'presses': [10, 0, 1]}, {'calls': [0, 1], 'log': ['invalid', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: cancel an earlier call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 7, 5]}, {'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}), ('sampled regression 71', {'floors': 13, 'floor': 9, 'doors_open': True, 'load_kg': 300, 'presses': [12, 12, 1, 5]}, {'calls': [1, 5, 12], 'log': ['registered', 'kept', 'registered', 'registered']}), ('control 46', {'floors': 10, 'floor': 3, 'doors_open': True, 'load_kg': 80, 'presses': [0, 9, 4, 7, 3, 6, 9, 7, 9]}, {'calls': [0, 4, 6, 9], 'log': ['registered', 'registered', 'registered', 'registered', 'reopen', 'registered', 'cancelled', 'cancelled', 'registered']}), ('boundary: child presses every button', {'floors': 12, 'floor': 0, 'doors_open': False, 'load_kg': 15, 'presses': [1, 2, 3, 4, 5, 6, 7]}, {'calls': [1, 2, 3, 4, 5], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'nuisance', 'nuisance']}), ('control 34', {'floors': 11, 'floor': 9, 'doors_open': False, 'load_kg': 0, 'presses': [10, 0, 5, 6, 0, 5, 9, 10, 9]}, {'calls': [6], 'log': ['registered', 'registered', 'registered', 'registered', 'cancelled', 'cancelled', 'registered', 'cancelled', 'cancelled']}), ('control 37', {'floors': 10, 'floor': 7, 'doors_open': True, 'load_kg': 80, 'presses': [10, 0, -1, -1, 5]}, {'calls': [0, 5], 'log': ['invalid', 'registered', 'invalid', 'invalid', 'registered']}), ('control 40', {'floors': 13, 'floor': 0, 'doors_open': True, 'load_kg': 15, 'presses': [0, -1, 8, 3]}, {'calls': [3, 8], 'log': ['reopen', 'invalid', 'registered', 'registered']})], [('regression: double press of the only call', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 3]}, {'calls': [3], 'log': ['registered', 'kept']}), ('boundary: double press cancels', {'floors': 10, 'floor': 0, 'doors_open': False, 'load_kg': 80, 'presses': [3, 5, 3]}, {'calls': [5], 'log': ['registered', 'registered', 'cancelled']}), ('sampled regression 27', {'floors': 8, 'floor': 4, 'doors_open': False, 'load_kg': 300, 'presses': [0, 0, 4, -1, 6, 8]}, {'calls': [0, 4, 6], 'log': ['registered', 'kept', 'registered', 'invalid', 'registered', 'invalid']}), ('control 66', {'floors': 9, 'floor': 2, 'doors_open': True, 'load_kg': 300, 'presses': [8, 2, 6, 8]}, {'calls': [6], 'log': ['registered', 'reopen', 'registered', 'cancelled']}), ('boundary: exactly twenty kilograms', {'floors': 12, 'floor': 0, 'doors_open': False, 'load_kg': 20, 'presses': [1, 2, 3, 4, 5, 6]}, {'calls': [1, 2, 3, 4, 5, 6], 'log': ['registered', 'registered', 'registered', 'registered', 'registered', 'registered']}), ('control 45', {'floors': 10, 'floor': 6, 'doors_open': False, 'load_kg': 20, 'presses': [10, 9, 0, 0, 5, 7, 2, 3, 3]}, {'calls': [2, 5, 7, 9], 'log': ['invalid', 'registered', 'registered', 'cancelled', 'registered', 'registered', 'registered', 'registered', 'cancelled']}), ('control 48', {'floors': 10, 'floor': 2, 'doors_open': False, 'load_kg': 0, 'presses': [6, 10, 7, 2, 7, 4, 9]}, {'calls': [2, 4, 6, 9], 'log': ['registered', 'invalid', 'registered', 'registered', 'cancelled', 'registered', 'registered']}), ('control 51', {'floors': 15, 'floor': 9, 'doors_open': True, 'load_kg': 21, 'presses': [13, 6, 9, 10, 9]}, {'calls': [6, 10, 13], 'log': ['registered', 'registered', 'reopen', 'registered', 'reopen']})]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: double press of the only call{'calls': [3], 'log': ['registered', 'kept']}{'calls': [3], 'log': ['registered', 'kept']}Passed
boundary: double press cancels{'calls': [5], 'log': ['registered', 'registered', 'cancelled']}{'calls': [5], 'log': ['registered', 'registered', 'cancelled']}Passed
sampled regression 5{'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}{'calls': [8, 10], 'log': ['registered', 'kept', 'registered']}Passed
boundary: cancel an earlier call{'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}{'calls': [3, 7], 'log': ['registered', 'registered', 'registered', 'cancelled']}Passed
boundary: own floor with doors closed{'calls': [4, 6], 'log': ['registered', 'registered']}{'calls': [4, 6], 'log': ['registered', 'registered']}Passed
sampled regression 1{'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}{'calls': [8], 'log': ['registered', 'kept', 'invalid', 'registered', 'cancelled']}Passed
control 4{'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}{'calls': [0, 4], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'cancelled']}Passed
control 7{'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']}{'calls': [0, 4, 5, 6], 'log': ['registered', 'registered', 'cancelled', 'registered', 'registered', 'registered']}Passed

SHA-256 / be7d066990ce2fbf14824d432ed307e23c41f92f56f2935f4717971851f7f063

Verification & scope

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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:47:53.491610+00:00.

Case digest / 6fe25a50addc3323a9fa71b611642868549013003d191f9a5bbe2bec8cec6f2b