{"abstract":"Express lane dynamic price returns a wrong result when the posted price is not floored at the minimum.","category":"Toll and parking fee computation","checks":8,"contract":"Input {density, prev_price, bands: [[density upto, price]] ascending, max_step, min_price, max_price, occupancy, hov_free_min, hov2_pct}. The target is the first band whose upto is >= density, else max_price. The posted price moves from prev_price toward the target by at most max_step either way, then is clamped to [min_price, max_price]. Vehicles with occupancy >= hov_free_min pay 0; occupancy 2 (when not free) pays hov2_pct percent floored to 5 cents. Return [posted, charged].","evaluation_group":"w2-toll_and_parking_fee_computation-express-lane-price","failed_approach":"Clamping only the maximum still lets the price fall below min_price.","family":"w2-toll_and_parking_fee_computation-express-lane-price-clamp","id":"FA-68571","implementations":{"attempt":{"sha256":"499c1180ab00b816dcb3d4715338d0ef71c862f9215972b3a5a4783f29b301d8","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    target = x['max_price']\n    for upto, price in x['bands']:\n        if x['density'] <= upto:\n            target = price\n            break\n    prev = x['prev_price']\n    step = max(-x['max_step'], min(x['max_step'], target - prev))\n    price = min(x['max_price'], prev + step)\n    if x['occupancy'] >= x['hov_free_min']:\n        return [price, 0]\n    if x['occupancy'] == 2:\n        return [price, price * x['hov2_pct'] // 100 // 5 * 5]\n    return [price, price]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'density': 37, 'prev_price': 650, 'bands': [[13, 475], [36, 650], [37, 800], [42, 1000]], 'max_step': 100, 'min_price': 50, 'max_price': 1200, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [750, 0]), ({'density': 19, 'prev_price': 625, 'bands': [[13, 125], [19, 725], [23, 750], [36, 925]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [675, 335]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 21, 'prev_price': 1250, 'bands': [[18, 225], [21, 250], [22, 350], [43, 525]], 'max_step': 100, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [800, 800]), ({'density': 44, 'prev_price': 1200, 'bands': [[19, 450], [40, 525], [41, 650], [44, 925]], 'max_step': 50, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 3, 'hov2_pct': 50}, [1150, 0]), ({'density': 11, 'prev_price': 1250, 'bands': [[11, 275], [17, 500], [21, 700], [44, 825]], 'max_step': 50, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [800, 800])], [({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 19, 'prev_price': 1250, 'bands': [[19, 275], [23, 475], [24, 575], [38, 825]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 0]), ({'density': 23, 'prev_price': 0, 'bands': [[13, 175], [19, 475], [23, 700], [29, 850]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [50, 50]), ({'density': 35, 'prev_price': 700, 'bands': [[23, 150], [33, 450], [38, 725], [41, 950]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [725, 360]), ({'density': 17, 'prev_price': 625, 'bands': [[17, 300], [28, 500], [30, 700], [36, 925]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 3, 'hov_free_min': 4, 'hov2_pct': 70}, [600, 600]), ({'density': 3, 'prev_price': 250, 'bands': [[15, 425], [20, 600], [24, 775], [27, 975]], 'max_step': 50, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [300, 300])], [({'density': 42, 'prev_price': 0, 'bands': [[14, 225], [16, 675], [30, 775], [42, 925]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 0]), ({'density': 10, 'prev_price': 225, 'bands': [[10, 75], [16, 300], [36, 725], [44, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [200, 200]), ({'density': 16, 'prev_price': 1200, 'bands': [[13, 50], [16, 450], [17, 725], [39, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 1, 'hov_free_min': 2, 'hov2_pct': 70}, [1175, 1175]), ({'density': 34, 'prev_price': 1175, 'bands': [[16, 225], [27, 325], [39, 400], [40, 475]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [1000, 1000]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 22, 'prev_price': 500, 'bands': [[10, 350], [19, 425], [22, 450], [24, 650]], 'max_step': 100, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [450, 450]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50])], [({'density': 18, 'prev_price': 850, 'bands': [[18, 100], [20, 175], [35, 250], [44, 800]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 50}, [825, 0]), ({'density': 16, 'prev_price': 25, 'bands': [[16, 50], [23, 350], [26, 700], [36, 725]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 4, 'hov_free_min': 4, 'hov2_pct': 70}, [50, 0]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 49, 'prev_price': 0, 'bands': [[12, 350], [33, 475], [34, 500], [41, 800]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [50, 50]), ({'density': 19, 'prev_price': 250, 'bands': [[19, 275], [31, 450], [37, 675], [40, 700]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [275, 135]), ({'density': 35, 'prev_price': 1300, 'bands': [[31, 175], [38, 200], [40, 400], [42, 800]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 0]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245])], [({'density': 14, 'prev_price': 925, 'bands': [[10, 150], [12, 525], [14, 750], [40, 850]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 2, 'hov2_pct': 70}, [800, 800]), ({'density': 34, 'prev_price': 0, 'bands': [[27, 450], [29, 525], [34, 550], [42, 950]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [50, 50]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 34, 'prev_price': 250, 'bands': [[16, 325], [33, 400], [34, 475], [38, 1000]], 'max_step': 100, 'min_price': 50, 'max_price': 1200, 'occupancy': 3, 'hov_free_min': 2, 'hov2_pct': 50}, [350, 0]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 37, 'prev_price': 850, 'bands': [[22, 525], [30, 800], [37, 825], [44, 975]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 4, 'hov_free_min': 2, 'hov2_pct': 70}, [825, 0]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 41, 'prev_price': 350, 'bands': [[29, 225], [33, 525], [41, 575], [44, 625]], 'max_step': 50, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 4, 'hov2_pct': 50}, [400, 0])]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, 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":"887686b1c913a7180b9f36e8ba9f51a615e82dbea0d23899dcd63c223c4aa23f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    target = x['max_price']\n    for upto, price in x['bands']:\n        if x['density'] <= upto:\n            target = price\n            break\n    prev = x['prev_price']\n    step = max(-x['max_step'], min(x['max_step'], target - prev))\n    price = prev + step\n    if x['occupancy'] >= x['hov_free_min']:\n        return [price, 0]\n    if x['occupancy'] == 2:\n        return [price, price * x['hov2_pct'] // 100 // 5 * 5]\n    return [price, price]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'density': 37, 'prev_price': 650, 'bands': [[13, 475], [36, 650], [37, 800], [42, 1000]], 'max_step': 100, 'min_price': 50, 'max_price': 1200, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [750, 0]), ({'density': 19, 'prev_price': 625, 'bands': [[13, 125], [19, 725], [23, 750], [36, 925]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [675, 335]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 21, 'prev_price': 1250, 'bands': [[18, 225], [21, 250], [22, 350], [43, 525]], 'max_step': 100, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [800, 800]), ({'density': 44, 'prev_price': 1200, 'bands': [[19, 450], [40, 525], [41, 650], [44, 925]], 'max_step': 50, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 3, 'hov2_pct': 50}, [1150, 0]), ({'density': 11, 'prev_price': 1250, 'bands': [[11, 275], [17, 500], [21, 700], [44, 825]], 'max_step': 50, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [800, 800])], [({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 19, 'prev_price': 1250, 'bands': [[19, 275], [23, 475], [24, 575], [38, 825]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 0]), ({'density': 23, 'prev_price': 0, 'bands': [[13, 175], [19, 475], [23, 700], [29, 850]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [50, 50]), ({'density': 35, 'prev_price': 700, 'bands': [[23, 150], [33, 450], [38, 725], [41, 950]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [725, 360]), ({'density': 17, 'prev_price': 625, 'bands': [[17, 300], [28, 500], [30, 700], [36, 925]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 3, 'hov_free_min': 4, 'hov2_pct': 70}, [600, 600]), ({'density': 3, 'prev_price': 250, 'bands': [[15, 425], [20, 600], [24, 775], [27, 975]], 'max_step': 50, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [300, 300])], [({'density': 42, 'prev_price': 0, 'bands': [[14, 225], [16, 675], [30, 775], [42, 925]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 0]), ({'density': 10, 'prev_price': 225, 'bands': [[10, 75], [16, 300], [36, 725], [44, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [200, 200]), ({'density': 16, 'prev_price': 1200, 'bands': [[13, 50], [16, 450], [17, 725], [39, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 1, 'hov_free_min': 2, 'hov2_pct': 70}, [1175, 1175]), ({'density': 34, 'prev_price': 1175, 'bands': [[16, 225], [27, 325], [39, 400], [40, 475]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [1000, 1000]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 22, 'prev_price': 500, 'bands': [[10, 350], [19, 425], [22, 450], [24, 650]], 'max_step': 100, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [450, 450]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50])], [({'density': 18, 'prev_price': 850, 'bands': [[18, 100], [20, 175], [35, 250], [44, 800]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 50}, [825, 0]), ({'density': 16, 'prev_price': 25, 'bands': [[16, 50], [23, 350], [26, 700], [36, 725]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 4, 'hov_free_min': 4, 'hov2_pct': 70}, [50, 0]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 49, 'prev_price': 0, 'bands': [[12, 350], [33, 475], [34, 500], [41, 800]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [50, 50]), ({'density': 19, 'prev_price': 250, 'bands': [[19, 275], [31, 450], [37, 675], [40, 700]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [275, 135]), ({'density': 35, 'prev_price': 1300, 'bands': [[31, 175], [38, 200], [40, 400], [42, 800]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 0]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245])], [({'density': 14, 'prev_price': 925, 'bands': [[10, 150], [12, 525], [14, 750], [40, 850]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 2, 'hov2_pct': 70}, [800, 800]), ({'density': 34, 'prev_price': 0, 'bands': [[27, 450], [29, 525], [34, 550], [42, 950]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [50, 50]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 34, 'prev_price': 250, 'bands': [[16, 325], [33, 400], [34, 475], [38, 1000]], 'max_step': 100, 'min_price': 50, 'max_price': 1200, 'occupancy': 3, 'hov_free_min': 2, 'hov2_pct': 50}, [350, 0]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 37, 'prev_price': 850, 'bands': [[22, 525], [30, 800], [37, 825], [44, 975]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 4, 'hov_free_min': 2, 'hov2_pct': 70}, [825, 0]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 41, 'prev_price': 350, 'bands': [[29, 225], [33, 525], [41, 575], [44, 625]], 'max_step': 50, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 4, 'hov2_pct': 50}, [400, 0])]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, 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"},"fixed":{"sha256":"980ced07e29bedb7ae976d8472ba2565f327eca14ff1296718c398f752f432a1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    target = x['max_price']\n    for upto, price in x['bands']:\n        if x['density'] <= upto:\n            target = price\n            break\n    prev = x['prev_price']\n    step = max(-x['max_step'], min(x['max_step'], target - prev))\n    price = max(x['min_price'], min(x['max_price'], prev + step))\n    if x['occupancy'] >= x['hov_free_min']:\n        return [price, 0]\n    if x['occupancy'] == 2:\n        return [price, price * x['hov2_pct'] // 100 // 5 * 5]\n    return [price, price]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'density': 37, 'prev_price': 650, 'bands': [[13, 475], [36, 650], [37, 800], [42, 1000]], 'max_step': 100, 'min_price': 50, 'max_price': 1200, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [750, 0]), ({'density': 19, 'prev_price': 625, 'bands': [[13, 125], [19, 725], [23, 750], [36, 925]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [675, 335]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 21, 'prev_price': 1250, 'bands': [[18, 225], [21, 250], [22, 350], [43, 525]], 'max_step': 100, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [800, 800]), ({'density': 44, 'prev_price': 1200, 'bands': [[19, 450], [40, 525], [41, 650], [44, 925]], 'max_step': 50, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 3, 'hov2_pct': 50}, [1150, 0]), ({'density': 11, 'prev_price': 1250, 'bands': [[11, 275], [17, 500], [21, 700], [44, 825]], 'max_step': 50, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [800, 800])], [({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 19, 'prev_price': 1250, 'bands': [[19, 275], [23, 475], [24, 575], [38, 825]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 0]), ({'density': 23, 'prev_price': 0, 'bands': [[13, 175], [19, 475], [23, 700], [29, 850]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [50, 50]), ({'density': 35, 'prev_price': 700, 'bands': [[23, 150], [33, 450], [38, 725], [41, 950]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [725, 360]), ({'density': 17, 'prev_price': 625, 'bands': [[17, 300], [28, 500], [30, 700], [36, 925]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 3, 'hov_free_min': 4, 'hov2_pct': 70}, [600, 600]), ({'density': 3, 'prev_price': 250, 'bands': [[15, 425], [20, 600], [24, 775], [27, 975]], 'max_step': 50, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [300, 300])], [({'density': 42, 'prev_price': 0, 'bands': [[14, 225], [16, 675], [30, 775], [42, 925]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 0]), ({'density': 10, 'prev_price': 225, 'bands': [[10, 75], [16, 300], [36, 725], [44, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [200, 200]), ({'density': 16, 'prev_price': 1200, 'bands': [[13, 50], [16, 450], [17, 725], [39, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1200, 'occupancy': 1, 'hov_free_min': 2, 'hov2_pct': 70}, [1175, 1175]), ({'density': 34, 'prev_price': 1175, 'bands': [[16, 225], [27, 325], [39, 400], [40, 475]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [1000, 1000]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 22, 'prev_price': 500, 'bands': [[10, 350], [19, 425], [22, 450], [24, 650]], 'max_step': 100, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [450, 450]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50])], [({'density': 18, 'prev_price': 850, 'bands': [[18, 100], [20, 175], [35, 250], [44, 800]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 50}, [825, 0]), ({'density': 16, 'prev_price': 25, 'bands': [[16, 50], [23, 350], [26, 700], [36, 725]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 4, 'hov_free_min': 4, 'hov2_pct': 70}, [50, 0]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 49, 'prev_price': 0, 'bands': [[12, 350], [33, 475], [34, 500], [41, 800]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [50, 50]), ({'density': 19, 'prev_price': 250, 'bands': [[19, 275], [31, 450], [37, 675], [40, 700]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 50}, [275, 135]), ({'density': 35, 'prev_price': 1300, 'bands': [[31, 175], [38, 200], [40, 400], [42, 800]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 3, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 0]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245])], [({'density': 14, 'prev_price': 925, 'bands': [[10, 150], [12, 525], [14, 750], [40, 850]], 'max_step': 25, 'min_price': 50, 'max_price': 800, 'occupancy': 1, 'hov_free_min': 2, 'hov2_pct': 70}, [800, 800]), ({'density': 34, 'prev_price': 0, 'bands': [[27, 450], [29, 525], [34, 550], [42, 950]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 4, 'hov2_pct': 50}, [50, 50]), ({'density': 25, 'prev_price': 0, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 50}, [50, 50]), ({'density': 34, 'prev_price': 250, 'bands': [[16, 325], [33, 400], [34, 475], [38, 1000]], 'max_step': 100, 'min_price': 50, 'max_price': 1200, 'occupancy': 3, 'hov_free_min': 2, 'hov2_pct': 50}, [350, 0]), ({'density': 45, 'prev_price': 1100, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 1, 'hov_free_min': 3, 'hov2_pct': 70}, [1000, 1000]), ({'density': 37, 'prev_price': 850, 'bands': [[22, 525], [30, 800], [37, 825], [44, 975]], 'max_step': 25, 'min_price': 50, 'max_price': 1000, 'occupancy': 4, 'hov_free_min': 2, 'hov2_pct': 70}, [825, 0]), ({'density': 20, 'prev_price': 300, 'bands': [[12, 100], [20, 400], [30, 700], [40, 900]], 'max_step': 50, 'min_price': 50, 'max_price': 1000, 'occupancy': 2, 'hov_free_min': 3, 'hov2_pct': 70}, [350, 245]), ({'density': 41, 'prev_price': 350, 'bands': [[29, 225], [33, 525], [41, 575], [44, 625]], 'max_step': 50, 'min_price': 50, 'max_price': 1200, 'occupancy': 4, 'hov_free_min': 4, 'hov2_pct': 50}, [400, 0])]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, 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":"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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-toll_and_parking_fee_computation-express-lane-price-clamp","generated_at":"2026-09-29T14:48:03.467160+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Fee engines bill customers in integer cents; a wrong boundary, rounding stage or cap scope silently over- or under-charges.","repair":"Restore the posted price bounds rule so that the step reads `max(x['min_price'], min(x['max_price'], prev + step))`.","root_cause":"A previous price outside the configured range is carried into the posted price.","sha256":"a1178c5703436a4f8af2ae8eeae3f3e240861e69436f0b79d68f1b9e45301e3b","title":"Express lane dynamic price: the posted price is not floored at the minimum · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":38.746,"exit_code":1,"observations":[{"actual":[750,0],"check":"fee oracle 0","expected":[750,0],"passed":true},{"actual":[675,335],"check":"fee oracle 1","expected":[675,335],"passed":true},{"actual":[350,245],"check":"fee oracle 2","expected":[350,245],"passed":true},{"actual":[1000,1000],"check":"fee oracle 3","expected":[1000,1000],"passed":true},{"actual":[25,25],"check":"fee oracle 4","expected":[50,50],"passed":false},{"actual":[800,800],"check":"fee oracle 5","expected":[800,800],"passed":true},{"actual":[1150,0],"check":"fee oracle 6","expected":[1150,0],"passed":true},{"actual":[800,800],"check":"fee oracle 7","expected":[800,800],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": [750, 0], \"expected\": [750, 0], \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": [675, 335], \"expected\": [675, 335], \"passed\": true}, {\"check\": \"fee oracle 2\", \"actual\": [350, 245], \"expected\": [350, 245], \"passed\": true}, {\"check\": \"fee oracle 3\", \"actual\": [1000, 1000], \"expected\": [1000, 1000], \"passed\": true}, {\"check\": \"fee oracle 4\", \"actual\": [25, 25], \"expected\": [50, 50], \"passed\": false}, {\"check\": \"fee oracle 5\", \"actual\": [800, 800], \"expected\": [800, 800], \"passed\": true}, {\"check\": \"fee oracle 6\", \"actual\": [1150, 0], \"expected\": [1150, 0], \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": [800, 800], \"expected\": [800, 800], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.447,"exit_code":1,"observations":[{"actual":[750,0],"check":"fee oracle 0","expected":[750,0],"passed":true},{"actual":[675,335],"check":"fee oracle 1","expected":[675,335],"passed":true},{"actual":[350,245],"check":"fee oracle 2","expected":[350,245],"passed":true},{"actual":[1050,1050],"check":"fee oracle 3","expected":[1000,1000],"passed":false},{"actual":[25,25],"check":"fee oracle 4","expected":[50,50],"passed":false},{"actual":[1150,1150],"check":"fee oracle 5","expected":[800,800],"passed":false},{"actual":[1150,0],"check":"fee oracle 6","expected":[1150,0],"passed":true},{"actual":[1200,1200],"check":"fee oracle 7","expected":[800,800],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": [750, 0], \"expected\": [750, 0], \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": [675, 335], \"expected\": [675, 335], \"passed\": true}, {\"check\": \"fee oracle 2\", \"actual\": [350, 245], \"expected\": [350, 245], \"passed\": true}, {\"check\": \"fee oracle 3\", \"actual\": [1050, 1050], \"expected\": [1000, 1000], \"passed\": false}, {\"check\": \"fee oracle 4\", \"actual\": [25, 25], \"expected\": [50, 50], \"passed\": false}, {\"check\": \"fee oracle 5\", \"actual\": [1150, 1150], \"expected\": [800, 800], \"passed\": false}, {\"check\": \"fee oracle 6\", \"actual\": [1150, 0], \"expected\": [1150, 0], \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": [1200, 1200], \"expected\": [800, 800], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":42.151,"exit_code":0,"observations":[{"actual":[750,0],"check":"fee oracle 0","expected":[750,0],"passed":true},{"actual":[675,335],"check":"fee oracle 1","expected":[675,335],"passed":true},{"actual":[350,245],"check":"fee oracle 2","expected":[350,245],"passed":true},{"actual":[1000,1000],"check":"fee oracle 3","expected":[1000,1000],"passed":true},{"actual":[50,50],"check":"fee oracle 4","expected":[50,50],"passed":true},{"actual":[800,800],"check":"fee oracle 5","expected":[800,800],"passed":true},{"actual":[1150,0],"check":"fee oracle 6","expected":[1150,0],"passed":true},{"actual":[800,800],"check":"fee oracle 7","expected":[800,800],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": [750, 0], \"expected\": [750, 0], \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": [675, 335], \"expected\": [675, 335], \"passed\": true}, {\"check\": \"fee oracle 2\", \"actual\": [350, 245], \"expected\": [350, 245], \"passed\": true}, {\"check\": \"fee oracle 3\", \"actual\": [1000, 1000], \"expected\": [1000, 1000], \"passed\": true}, {\"check\": \"fee oracle 4\", \"actual\": [50, 50], \"expected\": [50, 50], \"passed\": true}, {\"check\": \"fee oracle 5\", \"actual\": [800, 800], \"expected\": [800, 800], \"passed\": true}, {\"check\": \"fee oracle 6\", \"actual\": [1150, 0], \"expected\": [1150, 0], \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": [800, 800], \"expected\": [800, 800], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}