FA-94871 / Warehouse slotting and bin packing / Open access

Golden zone: heavy cap excludes level 2 · case 01

Heavy cartons are pushed to the floor level or left unslotted although level 2 is a permitted lift height.

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

ROOT CAUSE

The heavy-item level cap rejects level 2 itself instead of only levels above 2.

VERIFIED REPAIR

Reject heavy items only for slots whose level is greater than 2.

Unsuccessful approach: Raising the cap to level 3 lets heavy cartons into slots above the safe lift height.

Case contract

skus [[sku, weekly_picks, kg]], slots [[slot, level 1-5, ergonomic_score]]. Process SKUs by picks desc then sku. Each takes the best free eligible slot by score desc, level asc, slot id. Items over 20 kg may not be above level 2. Slots scoring 8+ are reserved for SKUs with at least 50 picks. No eligible slot -> None. Return [[sku, slot]] sorted by sku.

Why this case matters

Forward pick slotting places the fastest movers in ergonomic golden-zone locations.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(skus, slots):
    order = sorted(skus, key=lambda r: (-r[1], r[0]))
    used = set()
    out = {}
    for sku, picks, kg in order:
        best = None
        for s in sorted(slots, key=lambda s: (-s[2], s[1], s[0])):
            sid, lvl, score = s
            if sid in used:
                continue
            if kg > 20 and lvl >= 2:
                continue
            if score >= 8 and picks < 50:
                continue
            best = sid
            break
        if best is not None:
            used.add(best)
        out[sku] = best
    return [[k, out[k]] for k in sorted(out)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['generated mix 2', [[['K0', 80, 21], ['K1', 0, 21], ['K2', 80, 20], ['K3', 49, 21]], [['L0', 2, 3], ['L1', 3, 8], ['L2', 5, 9]]], [['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['generated mix 7', [[['K0', 51, 15], ['K1', 80, 30], ['K2', 10, 21]], [['L0', 1, 8], ['L1', 2, 3]]], [['K0', 'L1'], ['K1', 'L0'], ['K2', None]]], ['generated mix 15', [[['K0', 120, 21], ['K1', 0, 30], ['K2', 0, 21], ['K3', 80, 15], ['K4', 50, 2], ['K5', 80, 30]], [['L0', 5, 8], ['L1', 1, 3], ['L2', 3, 8], ['L3', 3, 6], ['L4', 2, 6], ['L5', 3, 10]]], [['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]]], [['generated mix 14', [[['K0', 0, 21], ['K1', 0, 2], ['K2', 49, 2], ['K3', 51, 21], ['K4', 49, 21]], [['L0', 2, 3], ['L1', 1, 8], ['L2', 3, 5], ['L3', 5, 10], ['L4', 5, 6]]], [['K0', None], ['K1', 'L2'], ['K2', 'L4'], ['K3', 'L1'], ['K4', 'L0']]], ['generated mix 26', [[['K0', 120, 15], ['K1', 0, 2], ['K2', 80, 21]], [['L0', 3, 9], ['L1', 5, 6], ['L2', 1, 3], ['L3', 4, 10]]], [['K0', 'L3'], ['K1', 'L1'], ['K2', 'L2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['generated mix 9', [[['K0', 50, 20], ['K1', 50, 30], ['K2', 0, 21], ['K3', 10, 20], ['K4', 10, 20], ['K5', 51, 2]], [['L0', 3, 9], ['L1', 4, 6], ['L2', 2, 3]]], [['K0', 'L1'], ['K1', 'L2'], ['K2', None], ['K3', None], ['K4', None], ['K5', 'L0']]], ['generated mix 18', [[['K0', 80, 20], ['K1', 120, 20], ['K2', 120, 30], ['K3', 120, 20], ['K4', 80, 21], ['K5', 10, 20]], [['L0', 1, 10], ['L1', 4, 8], ['L2', 1, 5], ['L3', 1, 3], ['L4', 2, 5], ['L5', 1, 3]]], [['K0', 'L4'], ['K1', 'L0'], ['K2', 'L2'], ['K3', 'L1'], ['K4', 'L3'], ['K5', 'L5']]]], [['generated mix 34', [[['K0', 80, 30], ['K1', 51, 30], ['K2', 0, 2], ['K3', 120, 2], ['K4', 0, 15], ['K5', 80, 21]], [['L0', 3, 9], ['L1', 1, 5], ['L2', 3, 6], ['L3', 2, 5], ['L4', 1, 3], ['L5', 4, 9], ['L6', 4, 10]]], [['K0', 'L1'], ['K1', 'L4'], ['K2', 'L2'], ['K3', 'L6'], ['K4', None], ['K5', 'L3']]], ['generated mix 45', [[['K0', 49, 30], ['K1', 80, 30], ['K2', 51, 15], ['K3', 50, 30], ['K4', 80, 20]], [['L0', 3, 10], ['L1', 5, 8], ['L2', 4, 6], ['L3', 4, 10], ['L4', 4, 9], ['L5', 3, 8]]], [['K0', None], ['K1', None], ['K2', 'L3'], ['K3', None], ['K4', 'L0']]], ['exactly 20 kg is not heavy', [[['e', 5, 20]], [['t', 4, 7], ['u', 1, 3]]], [['e', 't']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 20', [[['K0', 50, 15]], [['L0', 4, 3], ['L1', 3, 10], ['L2', 4, 8], ['L3', 5, 9]]], [['K0', 'L1']]], ['generated mix 28', [[['K0', 51, 20]], [['L0', 4, 5], ['L1', 4, 3], ['L2', 2, 8], ['L3', 2, 3], ['L4', 5, 6], ['L5', 5, 10]]], [['K0', 'L5']]]], [['generated mix 58', [[['K0', 10, 30], ['K1', 50, 15], ['K2', 80, 30], ['K3', 120, 15]], [['L0', 4, 8], ['L1', 2, 8], ['L2', 4, 8], ['L3', 2, 3]]], [['K0', None], ['K1', 'L0'], ['K2', 'L3'], ['K3', 'L1']]], ['generated mix 79', [[['K0', 51, 30], ['K1', 51, 2], ['K2', 80, 21], ['K3', 0, 21]], [['L0', 1, 8], ['L1', 3, 9], ['L2', 5, 10], ['L3', 1, 10]]], [['K0', 'L0'], ['K1', 'L2'], ['K2', 'L3'], ['K3', None]]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['exactly 20 kg is not heavy', [[['e', 5, 20]], [['t', 4, 7], ['u', 1, 3]]], [['e', 't']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['generated mix 31', [[['K0', 0, 21], ['K1', 10, 21], ['K2', 80, 2], ['K3', 0, 21], ['K4', 80, 2]], [['L0', 2, 5], ['L1', 4, 6], ['L2', 4, 3], ['L3', 2, 3], ['L4', 3, 8]]], [['K0', 'L3'], ['K1', 'L0'], ['K2', 'L4'], ['K3', None], ['K4', 'L1']]], ['generated mix 39', [[['K0', 0, 2], ['K1', 80, 15]], [['L0', 5, 8], ['L1', 1, 5], ['L2', 5, 8], ['L3', 1, 9], ['L4', 5, 9]]], [['K0', 'L1'], ['K1', 'L3']]]], [['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['generated mix 15', [[['K0', 120, 21], ['K1', 0, 30], ['K2', 0, 21], ['K3', 80, 15], ['K4', 50, 2], ['K5', 80, 30]], [['L0', 5, 8], ['L1', 1, 3], ['L2', 3, 8], ['L3', 3, 6], ['L4', 2, 6], ['L5', 3, 10]]], [['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 43', [[['K0', 120, 21], ['K1', 49, 21], ['K2', 80, 21], ['K3', 49, 21], ['K4', 80, 30]], [['L0', 2, 5], ['L1', 4, 9], ['L2', 5, 3], ['L3', 2, 5], ['L4', 2, 3], ['L5', 1, 9], ['L6', 1, 8]]], [['K0', 'L5'], ['K1', 'L3'], ['K2', 'L6'], ['K3', 'L4'], ['K4', 'L0']]], ['generated mix 51', [[['K0', 0, 21], ['K1', 80, 2], ['K2', 10, 20], ['K3', 80, 20]], [['L0', 5, 9], ['L1', 5, 9], ['L2', 1, 8], ['L3', 2, 3], ['L4', 1, 9], ['L5', 4, 8], ['L6', 4, 9]]], [['K0', None], ['K1', 'L4'], ['K2', 'L3'], ['K3', 'L6']]], ['generated mix 59', [[['K0', 0, 21], ['K1', 51, 20], ['K2', 120, 15]], [['L0', 2, 8], ['L1', 5, 10], ['L2', 4, 5], ['L3', 3, 9], ['L4', 3, 5], ['L5', 3, 8]]], [['K0', None], ['K1', 'L3'], ['K2', 'L1']]]]]
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 fixture	Actual	Expected	Outcome
heavy on level 2 ok	`[['h', None]]`	`[['h', 'b']]`	Failed
generated mix 2	`[['K0', None], ['K1', None], ['K2', 'L2'], ['K3', None]]`	`[['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]`	Failed
reservation at 50 picks	`[['f', 'g'], ['s', 'n']]`	`[['f', 'g'], ['s', 'n']]`	Passed
no eligible slot	`[['w', None]]`	`[['w', None]]`	Passed
tie in feed order	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
score tie prefers low level	`[['q', 'z']]`	`[['q', 'z']]`	Passed
generated mix 7	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	Passed
generated mix 15	`[['K0', 'L1'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', None]]`	`[['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]`	Failed

SHA-256 / 4fe4dcfae5c9cc129b5d2bc2af1afed90a49356a403cd3e7574eec88cf871cdc

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(skus, slots):
    order = sorted(skus, key=lambda r: (-r[1], r[0]))
    used = set()
    out = {}
    for sku, picks, kg in order:
        best = None
        for s in sorted(slots, key=lambda s: (-s[2], s[1], s[0])):
            sid, lvl, score = s
            if sid in used:
                continue
            if kg > 20 and lvl > 3:
                continue
            if score >= 8 and picks < 50:
                continue
            best = sid
            break
        if best is not None:
            used.add(best)
        out[sku] = best
    return [[k, out[k]] for k in sorted(out)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['generated mix 2', [[['K0', 80, 21], ['K1', 0, 21], ['K2', 80, 20], ['K3', 49, 21]], [['L0', 2, 3], ['L1', 3, 8], ['L2', 5, 9]]], [['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['generated mix 7', [[['K0', 51, 15], ['K1', 80, 30], ['K2', 10, 21]], [['L0', 1, 8], ['L1', 2, 3]]], [['K0', 'L1'], ['K1', 'L0'], ['K2', None]]], ['generated mix 15', [[['K0', 120, 21], ['K1', 0, 30], ['K2', 0, 21], ['K3', 80, 15], ['K4', 50, 2], ['K5', 80, 30]], [['L0', 5, 8], ['L1', 1, 3], ['L2', 3, 8], ['L3', 3, 6], ['L4', 2, 6], ['L5', 3, 10]]], [['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]]], [['generated mix 14', [[['K0', 0, 21], ['K1', 0, 2], ['K2', 49, 2], ['K3', 51, 21], ['K4', 49, 21]], [['L0', 2, 3], ['L1', 1, 8], ['L2', 3, 5], ['L3', 5, 10], ['L4', 5, 6]]], [['K0', None], ['K1', 'L2'], ['K2', 'L4'], ['K3', 'L1'], ['K4', 'L0']]], ['generated mix 26', [[['K0', 120, 15], ['K1', 0, 2], ['K2', 80, 21]], [['L0', 3, 9], ['L1', 5, 6], ['L2', 1, 3], ['L3', 4, 10]]], [['K0', 'L3'], ['K1', 'L1'], ['K2', 'L2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['generated mix 9', [[['K0', 50, 20], ['K1', 50, 30], ['K2', 0, 21], ['K3', 10, 20], ['K4', 10, 20], ['K5', 51, 2]], [['L0', 3, 9], ['L1', 4, 6], ['L2', 2, 3]]], [['K0', 'L1'], ['K1', 'L2'], ['K2', None], ['K3', None], ['K4', None], ['K5', 'L0']]], ['generated mix 18', [[['K0', 80, 20], ['K1', 120, 20], ['K2', 120, 30], ['K3', 120, 20], ['K4', 80, 21], ['K5', 10, 20]], [['L0', 1, 10], ['L1', 4, 8], ['L2', 1, 5], ['L3', 1, 3], ['L4', 2, 5], ['L5', 1, 3]]], [['K0', 'L4'], ['K1', 'L0'], ['K2', 'L2'], ['K3', 'L1'], ['K4', 'L3'], ['K5', 'L5']]]], [['generated mix 34', [[['K0', 80, 30], ['K1', 51, 30], ['K2', 0, 2], ['K3', 120, 2], ['K4', 0, 15], ['K5', 80, 21]], [['L0', 3, 9], ['L1', 1, 5], ['L2', 3, 6], ['L3', 2, 5], ['L4', 1, 3], ['L5', 4, 9], ['L6', 4, 10]]], [['K0', 'L1'], ['K1', 'L4'], ['K2', 'L2'], ['K3', 'L6'], ['K4', None], ['K5', 'L3']]], ['generated mix 45', [[['K0', 49, 30], ['K1', 80, 30], ['K2', 51, 15], ['K3', 50, 30], ['K4', 80, 20]], [['L0', 3, 10], ['L1', 5, 8], ['L2', 4, 6], ['L3', 4, 10], ['L4', 4, 9], ['L5', 3, 8]]], [['K0', None], ['K1', None], ['K2', 'L3'], ['K3', None], ['K4', 'L0']]], ['exactly 20 kg is not heavy', [[['e', 5, 20]], [['t', 4, 7], ['u', 1, 3]]], [['e', 't']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 20', [[['K0', 50, 15]], [['L0', 4, 3], ['L1', 3, 10], ['L2', 4, 8], ['L3', 5, 9]]], [['K0', 'L1']]], ['generated mix 28', [[['K0', 51, 20]], [['L0', 4, 5], ['L1', 4, 3], ['L2', 2, 8], ['L3', 2, 3], ['L4', 5, 6], ['L5', 5, 10]]], [['K0', 'L5']]]], [['generated mix 58', [[['K0', 10, 30], ['K1', 50, 15], ['K2', 80, 30], ['K3', 120, 15]], [['L0', 4, 8], ['L1', 2, 8], ['L2', 4, 8], ['L3', 2, 3]]], [['K0', None], ['K1', 'L0'], ['K2', 'L3'], ['K3', 'L1']]], ['generated mix 79', [[['K0', 51, 30], ['K1', 51, 2], ['K2', 80, 21], ['K3', 0, 21]], [['L0', 1, 8], ['L1', 3, 9], ['L2', 5, 10], ['L3', 1, 10]]], [['K0', 'L0'], ['K1', 'L2'], ['K2', 'L3'], ['K3', None]]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['exactly 20 kg is not heavy', [[['e', 5, 20]], [['t', 4, 7], ['u', 1, 3]]], [['e', 't']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['generated mix 31', [[['K0', 0, 21], ['K1', 10, 21], ['K2', 80, 2], ['K3', 0, 21], ['K4', 80, 2]], [['L0', 2, 5], ['L1', 4, 6], ['L2', 4, 3], ['L3', 2, 3], ['L4', 3, 8]]], [['K0', 'L3'], ['K1', 'L0'], ['K2', 'L4'], ['K3', None], ['K4', 'L1']]], ['generated mix 39', [[['K0', 0, 2], ['K1', 80, 15]], [['L0', 5, 8], ['L1', 1, 5], ['L2', 5, 8], ['L3', 1, 9], ['L4', 5, 9]]], [['K0', 'L1'], ['K1', 'L3']]]], [['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['generated mix 15', [[['K0', 120, 21], ['K1', 0, 30], ['K2', 0, 21], ['K3', 80, 15], ['K4', 50, 2], ['K5', 80, 30]], [['L0', 5, 8], ['L1', 1, 3], ['L2', 3, 8], ['L3', 3, 6], ['L4', 2, 6], ['L5', 3, 10]]], [['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 43', [[['K0', 120, 21], ['K1', 49, 21], ['K2', 80, 21], ['K3', 49, 21], ['K4', 80, 30]], [['L0', 2, 5], ['L1', 4, 9], ['L2', 5, 3], ['L3', 2, 5], ['L4', 2, 3], ['L5', 1, 9], ['L6', 1, 8]]], [['K0', 'L5'], ['K1', 'L3'], ['K2', 'L6'], ['K3', 'L4'], ['K4', 'L0']]], ['generated mix 51', [[['K0', 0, 21], ['K1', 80, 2], ['K2', 10, 20], ['K3', 80, 20]], [['L0', 5, 9], ['L1', 5, 9], ['L2', 1, 8], ['L3', 2, 3], ['L4', 1, 9], ['L5', 4, 8], ['L6', 4, 9]]], [['K0', None], ['K1', 'L4'], ['K2', 'L3'], ['K3', 'L6']]], ['generated mix 59', [[['K0', 0, 21], ['K1', 51, 20], ['K2', 120, 15]], [['L0', 2, 8], ['L1', 5, 10], ['L2', 4, 5], ['L3', 3, 9], ['L4', 3, 5], ['L5', 3, 8]]], [['K0', None], ['K1', 'L3'], ['K2', 'L1']]]]]
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 fixture	Actual	Expected	Outcome
heavy on level 2 ok	`[['h', 'a']]`	`[['h', 'b']]`	Failed
generated mix 2	`[['K0', 'L1'], ['K1', None], ['K2', 'L2'], ['K3', 'L0']]`	`[['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]`	Failed
reservation at 50 picks	`[['f', 'g'], ['s', 'n']]`	`[['f', 'g'], ['s', 'n']]`	Passed
no eligible slot	`[['w', None]]`	`[['w', None]]`	Passed
tie in feed order	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
score tie prefers low level	`[['q', 'z']]`	`[['q', 'z']]`	Passed
generated mix 7	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	Passed
generated mix 15	`[['K0', 'L5'], ['K1', 'L3'], ['K2', 'L1'], ['K3', 'L2'], ['K4', 'L0'], ['K5', 'L4']]`	`[['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]`	Failed

SHA-256 / 6a78ee8bcb11f0c690ca8686455b19b1584b401f05b76066e7bec51cdcc66847

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(skus, slots):
    order = sorted(skus, key=lambda r: (-r[1], r[0]))
    used = set()
    out = {}
    for sku, picks, kg in order:
        best = None
        for s in sorted(slots, key=lambda s: (-s[2], s[1], s[0])):
            sid, lvl, score = s
            if sid in used:
                continue
            if kg > 20 and lvl > 2:
                continue
            if score >= 8 and picks < 50:
                continue
            best = sid
            break
        if best is not None:
            used.add(best)
        out[sku] = best
    return [[k, out[k]] for k in sorted(out)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['generated mix 2', [[['K0', 80, 21], ['K1', 0, 21], ['K2', 80, 20], ['K3', 49, 21]], [['L0', 2, 3], ['L1', 3, 8], ['L2', 5, 9]]], [['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['generated mix 7', [[['K0', 51, 15], ['K1', 80, 30], ['K2', 10, 21]], [['L0', 1, 8], ['L1', 2, 3]]], [['K0', 'L1'], ['K1', 'L0'], ['K2', None]]], ['generated mix 15', [[['K0', 120, 21], ['K1', 0, 30], ['K2', 0, 21], ['K3', 80, 15], ['K4', 50, 2], ['K5', 80, 30]], [['L0', 5, 8], ['L1', 1, 3], ['L2', 3, 8], ['L3', 3, 6], ['L4', 2, 6], ['L5', 3, 10]]], [['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]]], [['generated mix 14', [[['K0', 0, 21], ['K1', 0, 2], ['K2', 49, 2], ['K3', 51, 21], ['K4', 49, 21]], [['L0', 2, 3], ['L1', 1, 8], ['L2', 3, 5], ['L3', 5, 10], ['L4', 5, 6]]], [['K0', None], ['K1', 'L2'], ['K2', 'L4'], ['K3', 'L1'], ['K4', 'L0']]], ['generated mix 26', [[['K0', 120, 15], ['K1', 0, 2], ['K2', 80, 21]], [['L0', 3, 9], ['L1', 5, 6], ['L2', 1, 3], ['L3', 4, 10]]], [['K0', 'L3'], ['K1', 'L1'], ['K2', 'L2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['generated mix 9', [[['K0', 50, 20], ['K1', 50, 30], ['K2', 0, 21], ['K3', 10, 20], ['K4', 10, 20], ['K5', 51, 2]], [['L0', 3, 9], ['L1', 4, 6], ['L2', 2, 3]]], [['K0', 'L1'], ['K1', 'L2'], ['K2', None], ['K3', None], ['K4', None], ['K5', 'L0']]], ['generated mix 18', [[['K0', 80, 20], ['K1', 120, 20], ['K2', 120, 30], ['K3', 120, 20], ['K4', 80, 21], ['K5', 10, 20]], [['L0', 1, 10], ['L1', 4, 8], ['L2', 1, 5], ['L3', 1, 3], ['L4', 2, 5], ['L5', 1, 3]]], [['K0', 'L4'], ['K1', 'L0'], ['K2', 'L2'], ['K3', 'L1'], ['K4', 'L3'], ['K5', 'L5']]]], [['generated mix 34', [[['K0', 80, 30], ['K1', 51, 30], ['K2', 0, 2], ['K3', 120, 2], ['K4', 0, 15], ['K5', 80, 21]], [['L0', 3, 9], ['L1', 1, 5], ['L2', 3, 6], ['L3', 2, 5], ['L4', 1, 3], ['L5', 4, 9], ['L6', 4, 10]]], [['K0', 'L1'], ['K1', 'L4'], ['K2', 'L2'], ['K3', 'L6'], ['K4', None], ['K5', 'L3']]], ['generated mix 45', [[['K0', 49, 30], ['K1', 80, 30], ['K2', 51, 15], ['K3', 50, 30], ['K4', 80, 20]], [['L0', 3, 10], ['L1', 5, 8], ['L2', 4, 6], ['L3', 4, 10], ['L4', 4, 9], ['L5', 3, 8]]], [['K0', None], ['K1', None], ['K2', 'L3'], ['K3', None], ['K4', 'L0']]], ['exactly 20 kg is not heavy', [[['e', 5, 20]], [['t', 4, 7], ['u', 1, 3]]], [['e', 't']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 20', [[['K0', 50, 15]], [['L0', 4, 3], ['L1', 3, 10], ['L2', 4, 8], ['L3', 5, 9]]], [['K0', 'L1']]], ['generated mix 28', [[['K0', 51, 20]], [['L0', 4, 5], ['L1', 4, 3], ['L2', 2, 8], ['L3', 2, 3], ['L4', 5, 6], ['L5', 5, 10]]], [['K0', 'L5']]]], [['generated mix 58', [[['K0', 10, 30], ['K1', 50, 15], ['K2', 80, 30], ['K3', 120, 15]], [['L0', 4, 8], ['L1', 2, 8], ['L2', 4, 8], ['L3', 2, 3]]], [['K0', None], ['K1', 'L0'], ['K2', 'L3'], ['K3', 'L1']]], ['generated mix 79', [[['K0', 51, 30], ['K1', 51, 2], ['K2', 80, 21], ['K3', 0, 21]], [['L0', 1, 8], ['L1', 3, 9], ['L2', 5, 10], ['L3', 1, 10]]], [['K0', 'L0'], ['K1', 'L2'], ['K2', 'L3'], ['K3', None]]], ['score tie prefers low level', [[['q', 10, 1]], [['z', 1, 6], ['a', 3, 6]]], [['q', 'z']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['exactly 20 kg is not heavy', [[['e', 5, 20]], [['t', 4, 7], ['u', 1, 3]]], [['e', 't']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['generated mix 31', [[['K0', 0, 21], ['K1', 10, 21], ['K2', 80, 2], ['K3', 0, 21], ['K4', 80, 2]], [['L0', 2, 5], ['L1', 4, 6], ['L2', 4, 3], ['L3', 2, 3], ['L4', 3, 8]]], [['K0', 'L3'], ['K1', 'L0'], ['K2', 'L4'], ['K3', None], ['K4', 'L1']]], ['generated mix 39', [[['K0', 0, 2], ['K1', 80, 15]], [['L0', 5, 8], ['L1', 1, 5], ['L2', 5, 8], ['L3', 1, 9], ['L4', 5, 9]]], [['K0', 'L1'], ['K1', 'L3']]]], [['heavy on level 2 ok', [[['h', 60, 25]], [['a', 3, 9], ['b', 2, 7]]], [['h', 'b']]], ['generated mix 15', [[['K0', 120, 21], ['K1', 0, 30], ['K2', 0, 21], ['K3', 80, 15], ['K4', 50, 2], ['K5', 80, 30]], [['L0', 5, 8], ['L1', 1, 3], ['L2', 3, 8], ['L3', 3, 6], ['L4', 2, 6], ['L5', 3, 10]]], [['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 43', [[['K0', 120, 21], ['K1', 49, 21], ['K2', 80, 21], ['K3', 49, 21], ['K4', 80, 30]], [['L0', 2, 5], ['L1', 4, 9], ['L2', 5, 3], ['L3', 2, 5], ['L4', 2, 3], ['L5', 1, 9], ['L6', 1, 8]]], [['K0', 'L5'], ['K1', 'L3'], ['K2', 'L6'], ['K3', 'L4'], ['K4', 'L0']]], ['generated mix 51', [[['K0', 0, 21], ['K1', 80, 2], ['K2', 10, 20], ['K3', 80, 20]], [['L0', 5, 9], ['L1', 5, 9], ['L2', 1, 8], ['L3', 2, 3], ['L4', 1, 9], ['L5', 4, 8], ['L6', 4, 9]]], [['K0', None], ['K1', 'L4'], ['K2', 'L3'], ['K3', 'L6']]], ['generated mix 59', [[['K0', 0, 21], ['K1', 51, 20], ['K2', 120, 15]], [['L0', 2, 8], ['L1', 5, 10], ['L2', 4, 5], ['L3', 3, 9], ['L4', 3, 5], ['L5', 3, 8]]], [['K0', None], ['K1', 'L3'], ['K2', 'L1']]]]]
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 fixture	Actual	Expected	Outcome
heavy on level 2 ok	`[['h', 'b']]`	`[['h', 'b']]`	Passed
generated mix 2	`[['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]`	`[['K0', 'L0'], ['K1', None], ['K2', 'L2'], ['K3', None]]`	Passed
reservation at 50 picks	`[['f', 'g'], ['s', 'n']]`	`[['f', 'g'], ['s', 'n']]`	Passed
no eligible slot	`[['w', None]]`	`[['w', None]]`	Passed
tie in feed order	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
score tie prefers low level	`[['q', 'z']]`	`[['q', 'z']]`	Passed
generated mix 7	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	Passed
generated mix 15	`[['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]`	`[['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]`	Passed

SHA-256 / 3576af9a66a0eded995dfd40f92ed264b515b9f7479bf17d7686e111d3730ee5

Verification & scope

Greedy stipulated slotting policy; real slotting optimizers weigh many more factors. 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 2026-09-29T14:52:08.469836+00:00.

Case digest / 89edef75f3274b00fb4bc1644df08e7ba52024001a54751da9e417259d4957e4