FA-40850 / Heap invariants / Member archive

Bucket bitmap consistency identifies set bits whose buckets are empty · case 05

The bounded priority bitset certificate reports an incorrect ghosts.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

A bounded bucket priority queue certificate supplies occupancy mask and bucket lists for priorities 0..width-1. Report actual occupancy mask, least occupied priority, greatest occupied priority, mask-only ghost priorities, missing-mask priorities, and popped-bucket bit clearing after removing one first element from requested priority. Empty buckets are valid.

Why this case matters

This isolates an internal heap representation or priority-structure invariant using deterministic finite records.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression certificate 2	`{"actual_mask": 1, "after_pop": 0, "ghosts": [0], "maximum": 0, "minimum": 0, "missing": []}`	`{"actual_mask": 1, "after_pop": 0, "ghosts": [], "maximum": 0, "minimum": 0, "missing": []}`	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.