Sample
Find the index of a specific element in a sorted list containing duplicates
sha256:de4d08928887828134110edcd137f83b030f3b508973b92860e7439bf8ec2234
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Find the index of a specific element in a sorted list containing duplicates HOW
- Packages
- collection 1.19.1
- Environment
- dart
- Created
- 2026-08-17T02:05:20Z
Commonly assumed
binarySearch returns the index of the first occurrence of the target element in the sorted list.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
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
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- dart 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-16 · ed25519:d91480838ac982c9