FA-68551 / Toll and parking fee computation / Open access

Cordon congestion charge: the cap applies to the whole billing period · case 01

Cordon congestion charge returns a wrong result when the cap applies to the whole billing period.

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

ROOT CAUSE

Days with many crossings are not capped.

THE FAILURE

Days with many crossings are not capped.

Unsuccessful approach: Capping the running total limits the whole period to one day of charges.

Case contract

Input {crossings: [[day, minute]] unordered, peak: [[start, end)] windows, peak_fee, offpeak_fee, daily_cap, weekend_free, zero_emission, grace}. Zero-emission vehicles pay 0. Days with day % 7 in {5, 6} are free when weekend_free. Within a day, a crossing no more than grace minutes after the last charged crossing is free (the grace anchor is the charged crossing). Each charged crossing pays the peak fee inside a window else off-peak; each day's sum is capped at daily_cap.

Why this case matters

Fee engines bill customers in integer cents; a wrong boundary, rounding stage or cap scope silently over- or under-charges.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(x):
    if x['zero_emission']:
        return 0
    byday = {}
    for d, m in sorted(x['crossings']):
        byday.setdefault(d, []).append(m)
    total = 0
    for d, ms in byday.items():
        if x['weekend_free'] and d % 7 >= 5:
            continue
        last = None
        day_sum = 0
        for m in ms:
            if last is not None and m - last <= x['grace']:
                continue
            last = m
            peak = any(s <= m < e for s, e in x['peak'])
            day_sum += x['peak_fee'] if peak else x['offpeak_fee']
        total += day_sum
    return total
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[({'crossings': [[6, 520], [8, 430], [8, 435], [0, 1106], [0, 1013]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2500), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[6, 497], [3, 958], [1, 326], [6, 1096], [1, 331], [8, 1070]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 3000), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[0, 1287], [0, 1302], [0, 1307], [2, 1091], [4, 959], [8, 998], [3, 769], [4, 644], [7, 461]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 4500), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[2, 347], [2, 352], [5, 726], [2, 1038], [7, 922], [8, 903], [2, 332]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2200), ({'crossings': [[0, 1186], [0, 531], [0, 807], [8, 437], [0, 975], [0, 1159], [0, 1154]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 15}, 2900)], [({'crossings': [[2, 1073], [7, 669], [4, 1136], [8, 1182], [8, 391], [4, 492]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 200, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 3000), ({'crossings': [[2, 416], [1, 1238], [2, 1124], [2, 431], [8, 952], [3, 965], [3, 1300]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 3400), ({'crossings': [[7, 869], [3, 859], [0, 544], [0, 1122], [4, 1253], [3, 675], [1, 929], [0, 1142], [6, 420]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2750), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[6, 1035], [7, 844], [2, 726], [2, 1037]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 2500), ({'crossings': [[1, 1185], [2, 606], [6, 710], [6, 812], [1, 719], [6, 721], [6, 736], [8, 822], [9, 1267]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 2700)], [({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[8, 1127], [7, 1208], [3, 443], [8, 415], [8, 1132], [8, 1112]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2700), ({'crossings': [[9, 1283], [2, 592], [4, 827], [4, 842], [8, 922], [7, 1070], [9, 1194], [2, 341]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 3300), ({'crossings': [[4, 502], [0, 1272], [7, 731], [4, 344], [4, 492], [2, 337], [4, 512]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 2750), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[7, 586], [5, 897], [1, 745], [2, 423], [7, 357], [2, 777], [4, 503], [1, 1075], [7, 362]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 3000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 4600), ({'crossings': [[8, 962], [8, 974]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1500)], [({'crossings': [[0, 930], [9, 511], [3, 655], [4, 476], [3, 1099], [0, 471], [3, 665], [3, 645], [3, 1032], [5, 1136]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 5300), ({'crossings': [[1, 972], [1, 992]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 1500), ({'crossings': [[5, 821], [1, 1260], [3, 425], [1, 614], [1, 604], [7, 629], [0, 651], [4, 469]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 200, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2600), ({'crossings': [[9, 475], [4, 460], [2, 477], [5, 386], [4, 651], [9, 455], [7, 710], [9, 1205], [4, 992]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 4150), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[7, 475], [7, 455], [0, 1155], [1, 872]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2400), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900)], [({'crossings': [[3, 573], [3, 585]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1500), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[3, 1246], [3, 413], [4, 534], [3, 1261]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1800), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[5, 1280], [4, 1116], [7, 944], [4, 1096]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 1750), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[6, 629], [6, 481], [5, 417], [5, 1096], [7, 856], [3, 1083], [6, 452], [4, 996]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 15}, 5400), ({'crossings': [[9, 418], [2, 613], [9, 470], [9, 480], [9, 788], [3, 753], [7, 486]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 3200)]]
for i, (args, expected) in enumerate(fixtures[N-1]):
    check('fee oracle' + ' %d' % i, 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 fixture	Actual	Expected	Outcome
fee oracle 0	`3000`	`2500`	Failed
fee oracle 1	`1400`	`1400`	Passed
fee oracle 2	`3300`	`3000`	Failed
fee oracle 3	`2700`	`2700`	Passed
fee oracle 4	`4500`	`4500`	Passed
fee oracle 5	`900`	`900`	Passed
fee oracle 6	`2200`	`2200`	Passed
fee oracle 7	`3450`	`2900`	Failed

SHA-256 / fe5f84a8af5e5ff3120ebd3e5a15b4811f48361b2e229833ae8bdd4f8f86d814

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(x):
    if x['zero_emission']:
        return 0
    byday = {}
    for d, m in sorted(x['crossings']):
        byday.setdefault(d, []).append(m)
    total = 0
    for d, ms in byday.items():
        if x['weekend_free'] and d % 7 >= 5:
            continue
        last = None
        day_sum = 0
        for m in ms:
            if last is not None and m - last <= x['grace']:
                continue
            last = m
            peak = any(s <= m < e for s, e in x['peak'])
            day_sum += x['peak_fee'] if peak else x['offpeak_fee']
        total = min(total + day_sum, x['daily_cap'])
    return total
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[({'crossings': [[6, 520], [8, 430], [8, 435], [0, 1106], [0, 1013]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2500), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[6, 497], [3, 958], [1, 326], [6, 1096], [1, 331], [8, 1070]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 3000), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[0, 1287], [0, 1302], [0, 1307], [2, 1091], [4, 959], [8, 998], [3, 769], [4, 644], [7, 461]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 4500), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[2, 347], [2, 352], [5, 726], [2, 1038], [7, 922], [8, 903], [2, 332]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2200), ({'crossings': [[0, 1186], [0, 531], [0, 807], [8, 437], [0, 975], [0, 1159], [0, 1154]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 15}, 2900)], [({'crossings': [[2, 1073], [7, 669], [4, 1136], [8, 1182], [8, 391], [4, 492]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 200, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 3000), ({'crossings': [[2, 416], [1, 1238], [2, 1124], [2, 431], [8, 952], [3, 965], [3, 1300]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 3400), ({'crossings': [[7, 869], [3, 859], [0, 544], [0, 1122], [4, 1253], [3, 675], [1, 929], [0, 1142], [6, 420]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2750), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[6, 1035], [7, 844], [2, 726], [2, 1037]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 2500), ({'crossings': [[1, 1185], [2, 606], [6, 710], [6, 812], [1, 719], [6, 721], [6, 736], [8, 822], [9, 1267]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 2700)], [({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[8, 1127], [7, 1208], [3, 443], [8, 415], [8, 1132], [8, 1112]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2700), ({'crossings': [[9, 1283], [2, 592], [4, 827], [4, 842], [8, 922], [7, 1070], [9, 1194], [2, 341]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 3300), ({'crossings': [[4, 502], [0, 1272], [7, 731], [4, 344], [4, 492], [2, 337], [4, 512]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 2750), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[7, 586], [5, 897], [1, 745], [2, 423], [7, 357], [2, 777], [4, 503], [1, 1075], [7, 362]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 3000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 4600), ({'crossings': [[8, 962], [8, 974]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1500)], [({'crossings': [[0, 930], [9, 511], [3, 655], [4, 476], [3, 1099], [0, 471], [3, 665], [3, 645], [3, 1032], [5, 1136]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 5300), ({'crossings': [[1, 972], [1, 992]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': False, 'zero_emission': False, 'grace': 10}, 1500), ({'crossings': [[5, 821], [1, 1260], [3, 425], [1, 614], [1, 604], [7, 629], [0, 651], [4, 469]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 200, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2600), ({'crossings': [[9, 475], [4, 460], [2, 477], [5, 386], [4, 651], [9, 455], [7, 710], [9, 1205], [4, 992]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 4150), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[7, 475], [7, 455], [0, 1155], [1, 872]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 2400), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900)], [({'crossings': [[3, 573], [3, 585]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1500), ({'crossings': [[6, 500], [0, 500], [5, 500]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 900), ({'crossings': [[3, 1246], [3, 413], [4, 534], [3, 1261]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 300, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1800), ({'crossings': [[2, 600], [2, 420], [2, 1140]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 1400), ({'crossings': [[5, 1280], [4, 1116], [7, 944], [4, 1096]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 250, 'daily_cap': 1500, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 1750), ({'crossings': [[1, 500], [1, 508], [1, 516], [1, 530]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 900, 'offpeak_fee': 250, 'daily_cap': 5000, 'weekend_free': True, 'zero_emission': False, 'grace': 10}, 2700), ({'crossings': [[6, 629], [6, 481], [5, 417], [5, 1096], [7, 856], [3, 1083], [6, 452], [4, 996]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 200, 'daily_cap': 2000, 'weekend_free': False, 'zero_emission': False, 'grace': 15}, 5400), ({'crossings': [[9, 418], [2, 613], [9, 470], [9, 480], [9, 788], [3, 753], [7, 486]], 'peak': [[420, 600], [960, 1140]], 'peak_fee': 1000, 'offpeak_fee': 300, 'daily_cap': 2000, 'weekend_free': True, 'zero_emission': False, 'grace': 15}, 3200)]]
for i, (args, expected) in enumerate(fixtures[N-1]):
    check('fee oracle' + ' %d' % i, 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 fixture	Actual	Expected	Outcome
fee oracle 0	`1500`	`2500`	Failed
fee oracle 1	`1400`	`1400`	Passed
fee oracle 2	`1500`	`3000`	Failed
fee oracle 3	`2700`	`2700`	Passed
fee oracle 4	`2000`	`4500`	Failed
fee oracle 5	`900`	`900`	Passed
fee oracle 6	`2000`	`2200`	Failed
fee oracle 7	`2000`	`2900`	Failed

SHA-256 / c6f6bb6e8f3f0d09c1dbf38d801aa821e65140f491c1d261de3cdbff36f75399

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 8 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

A deterministic, bounded toy model with a stipulated contract; it makes no claim of conformance to any agency manual or standard. 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 2026-09-29T14:48:03.186896+00:00.

Case digest / 15f6f488970fbe2f459cc20eda72224af5e651bb4d6d8444f08f811ff0ec6053