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ABC velocity: SKU that crosses 80% demoted · case 02

The SKU whose picks carry the cumulative share over 80% is classified B although the contract makes it A.

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Case contract

Input [[sku, weekly_picks]]. Rank by picks descending then sku ascending. SKUs with equal picks form a tie group whose cumulative prior share is the picks of strictly faster groups. picks 0 -> D (dead stock); prior share < 80% -> A; < 95% -> B; else C. Return [[sku, class]] in input order.

Why this case matters

Velocity classes drive which SKUs are slotted into forward pick areas.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
generated mix 3	`[["S24", "B"], ["S10", "C"], ["S13", "B"], ["S21", "A"], ["S27", "C"], ["S15", "A"], ["S26", "B"], ["S09", "A"]]`	`[["S24", "A"], ["S10", "C"], ["S13", "A"], ["S21", "A"], ["S27", "C"], ["S15", "A"], ["S26", "B"], ["S09", "A"]]`	Failed

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