FA-15228 / Numerics / Member archive
Multiset permutation unrank: rank block membership · case 03
The exact multiset permutation unrank result violates the stated contract at rank block membership.
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 | [0, 1, 1, 2] | [0, 1, 2, 1] | Failed |
MEMBER ARCHIVE
The complete case is available to members.
This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
Member access is invitation-based. Sign in with your invited account to inspect the sources.
Sign in to the archive ↗