FA-15239 / Numerics / Member archive
Multiset permutation unrank: trial symbol restoration · case 04
The exact multiset permutation unrank result violates the stated contract at trial symbol restoration.
Case contract
Input [sorted multiset of small integer symbols, rank], valid zero-based lexicographic rank among distinct permutations.
Why this case matters
Exact discrete arithmetic with observable algorithmic state; no floating point approximation is used.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| explicit oracle 0 | null | [0, 2, 1, 1] | Failed |
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