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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.

FilterVerdictallBetterSameWorseDomainallcsharppythonhr-lawhousing-lawmath428 rounds
#66810 May 26

Use UNION to combine current_employees and former_employees, marking source.

V1BetterV2—ΔL—csharp
#66710 May 26

Find orders where the order_date is later than the ship_date.

V1WorseV2—ΔL—csharp
#66610 May 26

Write a SQL query that returns products and their cumulative sales over time.

V1WorseV2—ΔL—csharp
#66510 May 26

Calculate a moving 7-day average of daily_sales using a window function.

V1BetterV2—ΔL—csharp
#66410 May 26

Find customers who placed orders in consecutive calendar months.

V1BetterV2—ΔL—csharp
#66310 May 26

Pivot a table of monthly_sales (month, year, total) to columns per month.

V1BetterV2—ΔL—csharp
#66210 May 26

Use ROW_NUMBER to deduplicate orders, keeping the most recent per customer.

V1BetterV2—ΔL+0.5csharp
#66110 May 26

Find duplicate rows in an emails table based on email address.

V1BetterV2—ΔL+0.0csharp
#66010 May 26

Write a self-join to find pairs of employees with the same manager.

V1BetterV2—ΔL—csharp
#65910 May 26

Calculate the percentage of total sales each product represents.

V1BetterV2—ΔL—csharp
#65810 May 26

Use a CTE to find the longest chain of referrals in a referrals table.

V1BetterV2—ΔL—csharp
#65710 May 26

Write a SQL query that returns customers with more than 3 orders.

V1BetterV2—ΔL—csharp
#65610 May 26

Find the second-highest salary in an employees table.

V1BetterV2—ΔL—csharp
#65510 May 26

Calculate the running total of sales by date using a window function.

V1BetterV2—ΔL—csharp
#65410 May 26

Use a window function to rank orders within each customer.

V1BetterV2—ΔL—csharp
#65310 May 26

Find products that have never been ordered using a left join.

V1BetterV2—ΔL—csharp
#65210 May 26

Write a SQL query that returns the top 5 customers by total spend in 2025.

V1WorseV2—ΔL—csharp
#65110 May 26

What is the least common multiple of 4, 6, and 9?

V1BetterV2—ΔL—csharp
#65010 May 26

Convert 5 over 8 to a percentage.

V1BetterV2—ΔL—csharp
#64910 May 26

What is the area of a circle with radius 5? Use pi approximately 3.14159.

V1BetterV2—ΔL—csharp
#64810 May 26

Simplify the expression 3x squared times 4x cubed.

V1BetterV2—ΔL—csharp
#64710 May 26

What is the next term in the sequence 2, 6, 18, 54?

V1SameV2—ΔL—csharp
#64610 May 26

If x plus y equals 10 and x minus y equals 4, what are x and y?

V1BetterV2—ΔL—csharp
#64510 May 26

What is the greatest common divisor of 36 and 48?

V1SameV2—ΔL—csharp