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Every round-trip in the corpus is public. Open one to see the prompt, the zero-point index, the baseline response, the enhanced response, and how each grader read the difference. Leave a comment if a grader's reading lands — or doesn't.

FilterVerdictall Better Same WorseDomainall csharp python hr-law housing-law math670 rounds

#114522 May 26

Author a pytest test module that verifies a class whose attribute lookup runs through __getattr__ for missing names. Use a @pytest.fixture to construct the instance under test and a second fixture with scope="module" for shared setup. Inside one test, use the monkeypatch fixture to replace os.environ entries for the duration of the test; inside another test, use unittest.mock.patch as a context manager to swap a method implementation. Assert behaviour with pytest.raises against a custom exception class and confirm the descriptor protocol still routes correctly through __get__ on a property.

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#114422 May 26

Define a Python decorator factory called trace_calls that returns a wrapper preserving the original function via functools.wraps so the __name__ and __doc__ attributes survive. The wrapper should log every call with logging.getLogger before delegating. Stack this decorator above functools.lru_cache with maxsize=128 on a recursive Fibonacci function and confirm the cache hit path still produces the trace entry. Separately, register a functools.singledispatch generic that formats int, list, and dict arguments differently, and decorate each registered overload with trace_calls. Use typing.Callable for the parameter annotation.

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#114322 May 26

Write an async function fetch_all that takes a list of URLs and concurrently fetches each one using async def coroutines and the await expression. Bound parallelism with asyncio.Semaphore set to 5 concurrent tasks. Schedule the work via asyncio.gather and collect results as a list of tuples (url, status, body). Use asyncio.wait_for to apply a per-request timeout that raises asyncio.TimeoutError on deadline. Launch the top-level coroutine with asyncio.run inside the main guard. Annotate the return type with typing.List and typing.Tuple.

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#114222 May 26

Implement an iterator class RingBuffer that exposes the __iter__ and __next__ methods to walk a fixed-capacity circular buffer of integers. Store the underlying state as a @dataclass with frozen=True for the capacity field and a separate mutable list for the contents. Expose __len__ for the len builtin and __contains__ for the in operator. Raise StopIteration when iteration completes one full lap. Add type hints using typing.Iterator and typing.Optional. The class should behave correctly under isinstance checks against collections.abc.Iterator.

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#114122 May 26

Write a Python script that uses pathlib.Path to walk a directory tree, calls path.glob on the pattern "*.log" recursively, reads each file with path.read_text, and extracts HTTP status codes using re.compile and re.finditer with a named capture group. Aggregate the counts into a dict keyed by status code, then emit the result via json.dumps with indent=2 to stdout. Guard the script body with an if __name__ == "__main__": block so the helper functions remain importable from other modules. Raise a clear exception if no log files match.

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#114022 May 26

Owner-occupier lives in the ground-floor flat of a converted Victorian house in Bristol and lets the upper two floors on a single AST to a couple plus their adult son and one lodger of the son — four occupiers over two floors above the owner. The owner argues this is a "resident landlord" arrangement excluded from HMO definition. Does HA 2004 section 254(2) HMO definition still capture the upper-floor letting?