{"abstract":"Repeated sample events are summed rather than last-writer replaced.","category":"PCM sample encoding","checks":8,"contract":"Reconstruct a sparse PCM packet into a fixed sample span using explicit silence, ignore out-of-range events and apply duplicate positions in arrival order.","contract_signature":"events, length, zero","evaluation_group":"s3-pcm-pcm-sparse-impulses","failed_approach":"First-writer semantics ignore corrected amplitude events.","family":"s3-pcm-pcm-sparse-impulses-duplicate-event","id":"FA-49431","implementations":{"attempt":{"sha256":"c3fef104c8ac7c7db17e55068e3ac9cfdcdcc2b9cf838fde4e5122a895a04555","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events, length, zero):\n    out=[zero]*length\n    for index,value in events:\n        if 0<=index<length:\n            out[index]=out[index] if out[index]!=zero else value\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[0, 130], [3, 129]], 4, 128)), [130, 128, 128, 129])\ncheck('oracle 2', solve(*([[1, 5], [1, 7]], 3, 0)), [0, 7, 0])\ncheck('oracle 3', solve(*([[-1, 3], [1, 4]], 3, 0)), [0, 4, 0])\ncheck('oracle 4', solve(*([], 3, 128)), [128, 128, 128])\ncheck('oracle 5', solve(*([[3, 7], [0, 2]], 3, 0)), [2, 0, 0])\ncheck('oracle 6', solve(*([], 0, 128)), [])\ncheck('oracle 7', solve(*([[0, 128], [0, 129]], 1, 128)), [129])\nif N == 1: check('variant packet 1', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129]], 5, 128]), [130, 128, 128, 129, 128])\nif N == 2: check('variant packet 2', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 6, 128]), [130, 128, 128, 129, 128, 128])\nif N == 3: check('variant packet 3', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 7, 128]), [130, 128, 128, 129, 128, 128, 128])\nif N == 4: check('variant packet 4', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 8, 128]), [130, 128, 128, 129, 128, 128, 128, 128])\nif N == 5: check('variant packet 5', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 9, 128]), [130, 128, 128, 129, 128, 128, 128, 128, 128])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"78ac1ecf74c7c02faa60126f4e06ad9101b880ebafd648ee3f65116917f3dc53","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events, length, zero):\n    out=[zero]*length\n    for index,value in events:\n        if 0<=index<length:\n            out[index]+=value\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[0, 130], [3, 129]], 4, 128)), [130, 128, 128, 129])\ncheck('oracle 2', solve(*([[1, 5], [1, 7]], 3, 0)), [0, 7, 0])\ncheck('oracle 3', solve(*([[-1, 3], [1, 4]], 3, 0)), [0, 4, 0])\ncheck('oracle 4', solve(*([], 3, 128)), [128, 128, 128])\ncheck('oracle 5', solve(*([[3, 7], [0, 2]], 3, 0)), [2, 0, 0])\ncheck('oracle 6', solve(*([], 0, 128)), [])\ncheck('oracle 7', solve(*([[0, 128], [0, 129]], 1, 128)), [129])\nif N == 1: check('variant packet 1', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129]], 5, 128]), [130, 128, 128, 129, 128])\nif N == 2: check('variant packet 2', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 6, 128]), [130, 128, 128, 129, 128, 128])\nif N == 3: check('variant packet 3', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 7, 128]), [130, 128, 128, 129, 128, 128, 128])\nif N == 4: check('variant packet 4', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 8, 128]), [130, 128, 128, 129, 128, 128, 128, 128])\nif N == 5: check('variant packet 5', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 9, 128]), [130, 128, 128, 129, 128, 128, 128, 128, 128])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Stipulated finite model; no claim of hardware timing or full file-format conformance. 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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"s3-pcm-pcm-sparse-impulses-duplicate-event","generated_at":"2026-09-29T14:44:59.936434+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Offline PCM interchange uses these exact bounded packet and sample representation decisions.","root_cause":"Repeated sample events are summed rather than last-writer replaced.","sha256":"dc8b08ad956ee38c84ad7c7756a44c6f2aa72797deedb1cad32ad2d75d4c1162","title":"Pcm sparse impulses: duplicate event · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":40.236,"exit_code":1,"observations":[{"actual":[130,128,128,129],"check":"oracle 1","expected":[130,128,128,129],"passed":true},{"actual":[0,5,0],"check":"oracle 2","expected":[0,7,0],"passed":false},{"actual":[0,4,0],"check":"oracle 3","expected":[0,4,0],"passed":true},{"actual":[128,128,128],"check":"oracle 4","expected":[128,128,128],"passed":true},{"actual":[2,0,0],"check":"oracle 5","expected":[2,0,0],"passed":true},{"actual":[],"check":"oracle 6","expected":[],"passed":true},{"actual":[129],"check":"oracle 7","expected":[129],"passed":true},{"actual":[130,128,128,129,128],"check":"variant packet 1","expected":[130,128,128,129,128],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [130, 128, 128, 129], \"expected\": [130, 128, 128, 129], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [0, 5, 0], \"expected\": [0, 7, 0], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [0, 4, 0], \"expected\": [0, 4, 0], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [128, 128, 128], \"expected\": [128, 128, 128], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [2, 0, 0], \"expected\": [2, 0, 0], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [129], \"expected\": [129], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [130, 128, 128, 129, 128], \"expected\": [130, 128, 128, 129, 128], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.038,"exit_code":1,"observations":[{"actual":[258,128,128,257],"check":"oracle 1","expected":[130,128,128,129],"passed":false},{"actual":[0,12,0],"check":"oracle 2","expected":[0,7,0],"passed":false},{"actual":[0,4,0],"check":"oracle 3","expected":[0,4,0],"passed":true},{"actual":[128,128,128],"check":"oracle 4","expected":[128,128,128],"passed":true},{"actual":[2,0,0],"check":"oracle 5","expected":[2,0,0],"passed":true},{"actual":[],"check":"oracle 6","expected":[],"passed":true},{"actual":[385],"check":"oracle 7","expected":[129],"passed":false},{"actual":[388,128,128,386,128],"check":"variant packet 1","expected":[130,128,128,129,128],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [258, 128, 128, 257], \"expected\": [130, 128, 128, 129], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [0, 12, 0], \"expected\": [0, 7, 0], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [0, 4, 0], \"expected\": [0, 4, 0], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [128, 128, 128], \"expected\": [128, 128, 128], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [2, 0, 0], \"expected\": [2, 0, 0], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [385], \"expected\": [129], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [388, 128, 128, 386, 128], \"expected\": [130, 128, 128, 129, 128], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}