FA-94886 / Warehouse slotting and bin packing / Open access

Golden zone: slow SKUs choose slots first · case 01

The slowest SKUs grab the best slots before the fastest movers are considered.

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

ROOT CAUSE

The SKU processing order sorts weekly picks ascending.

VERIFIED REPAIR

Process SKUs by weekly picks descending, then sku code ascending.

Unsuccessful approach: Dropping the sku tie-break leaves equal-velocity SKUs in feed order, so slot outcomes depend on input order.

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 = [[['generated mix 1', [[['K0', 120, 21], ['K1', 49, 20], ['K2', 120, 15]], [['L0', 1, 3], ['L1', 4, 3], ['L2', 1, 9], ['L3', 2, 3]]], [['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]], ['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']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['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 10', [[['K0', 51, 20], ['K1', 50, 30], ['K2', 50, 21]], [['L0', 1, 5], ['L1', 2, 8], ['L2', 2, 3], ['L3', 1, 6], ['L4', 2, 8], ['L5', 1, 6]]], [['K0', 'L1'], ['K1', 'L4'], ['K2', 'L3']]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['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 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 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']]]], [['generated mix 22', [[['K0', 120, 20], ['K1', 80, 2], ['K2', 120, 15], ['K3', 80, 2], ['K4', 49, 20], ['K5', 0, 15]], [['L0', 2, 3], ['L1', 4, 8], ['L2', 4, 10], ['L3', 2, 10], ['L4', 1, 3]]], [['K0', 'L3'], ['K1', 'L1'], ['K2', 'L2'], ['K3', 'L4'], ['K4', 'L0'], ['K5', 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']]], ['two skus compete', [[['a', 90, 1], ['b', 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 29', [[['K0', 50, 20]], [['L0', 4, 3], ['L1', 4, 10], ['L2', 5, 6]]], [['K0', 'L1']]], ['generated mix 37', [[['K0', 49, 2], ['K1', 0, 20], ['K2', 50, 20], ['K3', 120, 21], ['K4', 10, 30]], [['L0', 4, 6], ['L1', 3, 5], ['L2', 2, 8], ['L3', 1, 8]]], [['K0', 'L0'], ['K1', 'L1'], ['K2', 'L2'], ['K3', 'L3'], ['K4', None]]]], [['generated mix 40', [[['K0', 49, 20], ['K1', 50, 21], ['K2', 51, 15], ['K3', 10, 15]], [['L0', 2, 10], ['L1', 4, 8], ['L2', 1, 5], ['L3', 5, 10], ['L4', 2, 10], ['L5', 1, 9], ['L6', 4, 6]]], [['K0', 'L6'], ['K1', 'L4'], ['K2', 'L0'], ['K3', 'L2']]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['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']]], ['generated mix 48', [[['K0', 50, 20], ['K1', 120, 15], ['K2', 0, 2], ['K3', 80, 30]], [['L0', 2, 10], ['L1', 3, 9], ['L2', 1, 9], ['L3', 2, 8], ['L4', 1, 10]]], [['K0', 'L2'], ['K1', 'L4'], ['K2', None], ['K3', 'L0']]]], [['generated mix 52', [[['K0', 10, 20], ['K1', 10, 15], ['K2', 0, 21], ['K3', 0, 30], ['K4', 0, 20]], [['L0', 5, 9], ['L1', 3, 5]]], [['K0', 'L1'], ['K1', None], ['K2', None], ['K3', None], ['K4', 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']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 42', [[['K0', 51, 15]], [['L0', 5, 6], ['L1', 4, 10], ['L2', 1, 8], ['L3', 3, 9], ['L4', 4, 8]]], [['K0', 'L1']]], ['generated mix 50', [[['K0', 120, 21], ['K1', 49, 21], ['K2', 49, 2], ['K3', 49, 20], ['K4', 49, 15], ['K5', 80, 20]], [['L0', 2, 3], ['L1', 5, 10], ['L2', 3, 9], ['L3', 2, 5], ['L4', 1, 5], ['L5', 3, 3], ['L6', 1, 8]]], [['K0', 'L6'], ['K1', 'L4'], ['K2', 'L3'], ['K3', 'L0'], ['K4', 'L5'], ['K5', 'L1']]], ['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
generated mix 1	`[['K0', 'L2'], ['K1', 'L0'], ['K2', 'L3']]`	`[['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]`	Failed
tie in feed order	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
heavy on level 2 ok	`[['h', 'b']]`	`[['h', 'b']]`	Passed
score tie prefers low level	`[['q', 'z']]`	`[['q', 'z']]`	Passed
two skus compete	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
reservation at 50 picks	`[['f', 'g'], ['s', 'n']]`	`[['f', 'g'], ['s', 'n']]`	Passed
generated mix 7	`[['K0', 'L0'], ['K1', None], ['K2', 'L1']]`	`[['K0', 'L1'], ['K1', 'L0'], ['K2', None]]`	Failed
generated mix 15	`[['K0', None], ['K1', 'L4'], ['K2', 'L1'], ['K3', 'L2'], ['K4', 'L5'], ['K5', None]]`	`[['K0', 'L4'], ['K1', None], ['K2', None], ['K3', 'L5'], ['K4', 'L2'], ['K5', 'L1']]`	Failed

SHA-256 / b99f35a000be120eb054e37620a975464abd5a1c605d0cb42c8d9fbb1f7ef8db

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])
    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 = [[['generated mix 1', [[['K0', 120, 21], ['K1', 49, 20], ['K2', 120, 15]], [['L0', 1, 3], ['L1', 4, 3], ['L2', 1, 9], ['L3', 2, 3]]], [['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]], ['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']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['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 10', [[['K0', 51, 20], ['K1', 50, 30], ['K2', 50, 21]], [['L0', 1, 5], ['L1', 2, 8], ['L2', 2, 3], ['L3', 1, 6], ['L4', 2, 8], ['L5', 1, 6]]], [['K0', 'L1'], ['K1', 'L4'], ['K2', 'L3']]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['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 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 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']]]], [['generated mix 22', [[['K0', 120, 20], ['K1', 80, 2], ['K2', 120, 15], ['K3', 80, 2], ['K4', 49, 20], ['K5', 0, 15]], [['L0', 2, 3], ['L1', 4, 8], ['L2', 4, 10], ['L3', 2, 10], ['L4', 1, 3]]], [['K0', 'L3'], ['K1', 'L1'], ['K2', 'L2'], ['K3', 'L4'], ['K4', 'L0'], ['K5', 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']]], ['two skus compete', [[['a', 90, 1], ['b', 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 29', [[['K0', 50, 20]], [['L0', 4, 3], ['L1', 4, 10], ['L2', 5, 6]]], [['K0', 'L1']]], ['generated mix 37', [[['K0', 49, 2], ['K1', 0, 20], ['K2', 50, 20], ['K3', 120, 21], ['K4', 10, 30]], [['L0', 4, 6], ['L1', 3, 5], ['L2', 2, 8], ['L3', 1, 8]]], [['K0', 'L0'], ['K1', 'L1'], ['K2', 'L2'], ['K3', 'L3'], ['K4', None]]]], [['generated mix 40', [[['K0', 49, 20], ['K1', 50, 21], ['K2', 51, 15], ['K3', 10, 15]], [['L0', 2, 10], ['L1', 4, 8], ['L2', 1, 5], ['L3', 5, 10], ['L4', 2, 10], ['L5', 1, 9], ['L6', 4, 6]]], [['K0', 'L6'], ['K1', 'L4'], ['K2', 'L0'], ['K3', 'L2']]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['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']]], ['generated mix 48', [[['K0', 50, 20], ['K1', 120, 15], ['K2', 0, 2], ['K3', 80, 30]], [['L0', 2, 10], ['L1', 3, 9], ['L2', 1, 9], ['L3', 2, 8], ['L4', 1, 10]]], [['K0', 'L2'], ['K1', 'L4'], ['K2', None], ['K3', 'L0']]]], [['generated mix 52', [[['K0', 10, 20], ['K1', 10, 15], ['K2', 0, 21], ['K3', 0, 30], ['K4', 0, 20]], [['L0', 5, 9], ['L1', 3, 5]]], [['K0', 'L1'], ['K1', None], ['K2', None], ['K3', None], ['K4', 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']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 42', [[['K0', 51, 15]], [['L0', 5, 6], ['L1', 4, 10], ['L2', 1, 8], ['L3', 3, 9], ['L4', 4, 8]]], [['K0', 'L1']]], ['generated mix 50', [[['K0', 120, 21], ['K1', 49, 21], ['K2', 49, 2], ['K3', 49, 20], ['K4', 49, 15], ['K5', 80, 20]], [['L0', 2, 3], ['L1', 5, 10], ['L2', 3, 9], ['L3', 2, 5], ['L4', 1, 5], ['L5', 3, 3], ['L6', 1, 8]]], [['K0', 'L6'], ['K1', 'L4'], ['K2', 'L3'], ['K3', 'L0'], ['K4', 'L5'], ['K5', 'L1']]], ['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
generated mix 1	`[['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]`	`[['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]`	Passed
tie in feed order	`[['a', 's2'], ['b', 's1']]`	`[['a', 's1'], ['b', 's2']]`	Failed
heavy on level 2 ok	`[['h', 'b']]`	`[['h', 'b']]`	Passed
score tie prefers low level	`[['q', 'z']]`	`[['q', 'z']]`	Passed
two skus compete	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
reservation at 50 picks	`[['f', 'g'], ['s', 'n']]`	`[['f', 'g'], ['s', 'n']]`	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 / d070823975de7d18a4e7d1bdf9eca6edb5439a98b63cc596f577fd5b6ea090e1

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 = [[['generated mix 1', [[['K0', 120, 21], ['K1', 49, 20], ['K2', 120, 15]], [['L0', 1, 3], ['L1', 4, 3], ['L2', 1, 9], ['L3', 2, 3]]], [['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]], ['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']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['reservation at 50 picks', [[['f', 50, 5], ['s', 49, 5]], [['g', 2, 8], ['n', 1, 6]]], [['f', 'g'], ['s', 'n']]], ['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 10', [[['K0', 51, 20], ['K1', 50, 30], ['K2', 50, 21]], [['L0', 1, 5], ['L1', 2, 8], ['L2', 2, 3], ['L3', 1, 6], ['L4', 2, 8], ['L5', 1, 6]]], [['K0', 'L1'], ['K1', 'L4'], ['K2', 'L3']]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['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 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 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']]]], [['generated mix 22', [[['K0', 120, 20], ['K1', 80, 2], ['K2', 120, 15], ['K3', 80, 2], ['K4', 49, 20], ['K5', 0, 15]], [['L0', 2, 3], ['L1', 4, 8], ['L2', 4, 10], ['L3', 2, 10], ['L4', 1, 3]]], [['K0', 'L3'], ['K1', 'L1'], ['K2', 'L2'], ['K3', 'L4'], ['K4', 'L0'], ['K5', 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']]], ['two skus compete', [[['a', 90, 1], ['b', 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 29', [[['K0', 50, 20]], [['L0', 4, 3], ['L1', 4, 10], ['L2', 5, 6]]], [['K0', 'L1']]], ['generated mix 37', [[['K0', 49, 2], ['K1', 0, 20], ['K2', 50, 20], ['K3', 120, 21], ['K4', 10, 30]], [['L0', 4, 6], ['L1', 3, 5], ['L2', 2, 8], ['L3', 1, 8]]], [['K0', 'L0'], ['K1', 'L1'], ['K2', 'L2'], ['K3', 'L3'], ['K4', None]]]], [['generated mix 40', [[['K0', 49, 20], ['K1', 50, 21], ['K2', 51, 15], ['K3', 10, 15]], [['L0', 2, 10], ['L1', 4, 8], ['L2', 1, 5], ['L3', 5, 10], ['L4', 2, 10], ['L5', 1, 9], ['L6', 4, 6]]], [['K0', 'L6'], ['K1', 'L4'], ['K2', 'L0'], ['K3', 'L2']]], ['tie in feed order', [[['b', 90, 1], ['a', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['no eligible slot', [[['w', 5, 40]], [['a', 4, 5]]], [['w', None]]], ['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']]], ['generated mix 48', [[['K0', 50, 20], ['K1', 120, 15], ['K2', 0, 2], ['K3', 80, 30]], [['L0', 2, 10], ['L1', 3, 9], ['L2', 1, 9], ['L3', 2, 8], ['L4', 1, 10]]], [['K0', 'L2'], ['K1', 'L4'], ['K2', None], ['K3', 'L0']]]], [['generated mix 52', [[['K0', 10, 20], ['K1', 10, 15], ['K2', 0, 21], ['K3', 0, 30], ['K4', 0, 20]], [['L0', 5, 9], ['L1', 3, 5]]], [['K0', 'L1'], ['K1', None], ['K2', None], ['K3', None], ['K4', 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']]], ['two skus compete', [[['a', 90, 1], ['b', 90, 1]], [['s1', 2, 9], ['s2', 3, 5]]], [['a', 's1'], ['b', 's2']]], ['generated mix 42', [[['K0', 51, 15]], [['L0', 5, 6], ['L1', 4, 10], ['L2', 1, 8], ['L3', 3, 9], ['L4', 4, 8]]], [['K0', 'L1']]], ['generated mix 50', [[['K0', 120, 21], ['K1', 49, 21], ['K2', 49, 2], ['K3', 49, 20], ['K4', 49, 15], ['K5', 80, 20]], [['L0', 2, 3], ['L1', 5, 10], ['L2', 3, 9], ['L3', 2, 5], ['L4', 1, 5], ['L5', 3, 3], ['L6', 1, 8]]], [['K0', 'L6'], ['K1', 'L4'], ['K2', 'L3'], ['K3', 'L0'], ['K4', 'L5'], ['K5', 'L1']]], ['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
generated mix 1	`[['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]`	`[['K0', 'L2'], ['K1', 'L3'], ['K2', 'L0']]`	Passed
tie in feed order	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
heavy on level 2 ok	`[['h', 'b']]`	`[['h', 'b']]`	Passed
score tie prefers low level	`[['q', 'z']]`	`[['q', 'z']]`	Passed
two skus compete	`[['a', 's1'], ['b', 's2']]`	`[['a', 's1'], ['b', 's2']]`	Passed
reservation at 50 picks	`[['f', 'g'], ['s', 'n']]`	`[['f', 'g'], ['s', 'n']]`	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 / d164501b6add0ecb2fdb3b5c42d1998896edb2c21a1a8e6e281e86c58acf027e

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 2026-09-29T14:52:08.560321+00:00.

Case digest / e676ca78f383cff3ff1370376d6bbb0c3860e5c1d406dded9001b25979607077