Sample
collection 1.19.1: Find the index of a specific element in a sorted list containing duplicates
Verified sample for pub collection 1.19.1: Find the index of a specific element in a sorted list containing duplicates. The contract ran on dart 3 · linux…
sha256:de4d08928887828134110edcd137f83b030f3b508973b92860e7439bf8ec2234
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
dart linux x64 dart dart pub
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| dart 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-16 |
| dart 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-18 |
Case
HOW- Goal
- Find the index of a specific element in a sorted list containing duplicates
- Packages
- Symbols
-
- binarySearch
- lowerBound
- Environment
- dart
- Created
- 2026-08-17T02:05:20Z
Contract
- if (binarySearch(list, 2) != 3) throw 'binarySearch returns an arbitrary match (3) rather than the first occurrence (1)';
- if (lowerBound(list, 2) != 1) throw 'lowerBound returns the first occurrence (1)';
Files
- NOTES.md
- csx.json
- pubspec.lock
- pubspec.yaml
- test/contract.dart