Public viewer
The journey of every round
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.
Define a gRPC service in protobuf with one bidirectional streaming method that echoes back messages with a server-side timestamp. Show the server-side service implementation.
Build a SignalR Hub that lets clients subscribe to a 'price-tick' channel and broadcasts ticks to all subscribers on a one-second timer.
Write a FluentValidation AbstractValidator<T> for a 'RegisterUser' command: email (valid format), password (≥ 8 chars, has digit and symbol), age (18+).
Implement an IHealthCheck that returns Healthy when a TCP socket on a remote host responds within 500ms, and Unhealthy otherwise.
Write a Regex that matches IPv4 addresses in the form '1.2.3.4' (each octet 0–255). Use Regex.Match on a sample string.
Write a ReadOnlySpan<byte>-based UTF-8 BOM check: return true if the span starts with the bytes 0xEF 0xBB 0xBF.
Build a SignalR Hub that lets clients subscribe to a 'price-tick' channel and broadcasts ticks to all subscribers on a one-second timer.
I had work done on my house and the workmanship is poor. What are my options under the Consumer Rights Act?
The trader says I bought the item "as seen" — does that remove my consumer rights?
The product description said waterproof but the item leaks. What can I do?
The retailer is charging me a restocking fee for a return. Is that allowed?
I paid for a service that wasn't completed. Am I entitled to my money back?
The seller says the warranty only covers manufacturing defects. Does that limit my statutory rights?
I bought online but didn't open the box for 30 days. Can I still return it?
I bought a kettle that broke after 3 weeks. Am I entitled to a refund under UK consumer law?
Write a SQL query that returns the top 5 customers by total spend in 2025.
What is the least common multiple of 4, 6, and 9?
What is the area of a circle with radius 5? Use pi approximately 3.14159.
Simplify the expression 3x squared times 4x cubed.
What is the greatest common divisor of 36 and 48?
Calculate 25 squared minus 24 squared.
What is 2 cubed times 3 squared?
What is the perimeter of a triangle with sides 5, 7, and 10?
Solve: 2x squared minus 8 equals 0