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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-lawmath823 rounds
#80510 May 26

Find products in the top 10 percent by revenue using NTILE.

V1BetterV2—ΔL—csharp
#80410 May 26

Calculate the gap in days between consecutive logins per user using LAG.

V1BetterV2—ΔL—csharp
#80310 May 26

Use EXISTS to find customers with at least one cancelled order.

V1BetterV2—ΔL—csharp
#80210 May 26

Find the median salary in each department using window functions.

V1BetterV2—ΔL—csharp
#80110 May 26

Write a recursive CTE to walk an employee-manager hierarchy from any starting employee.

V1BetterV2—ΔL—csharp
#80010 May 26

Use UNION to combine current_employees and former_employees, marking source.

V1BetterV2—ΔL—csharp
#79910 May 26

Find orders where the order_date is later than the ship_date.

V1BetterV2—ΔL—csharp
#79810 May 26

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

V1BetterV2—ΔL—csharp
#79710 May 26

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

V1BetterV2—ΔL—csharp
#79610 May 26

Find customers who placed orders in consecutive calendar months.

V1BetterV2—ΔL—csharp
#79510 May 26

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

V1BetterV2—ΔL—csharp
#79410 May 26

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

V1BetterV2—ΔL+0.5csharp
#79310 May 26

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

V1BetterV2—ΔL+0.5csharp
#79210 May 26

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

V1SameV2—ΔL—csharp
#79110 May 26

Calculate the percentage of total sales each product represents.

V1BetterV2—ΔL—csharp
#79010 May 26

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

V1BetterV2—ΔL—csharp
#78910 May 26

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

V1BetterV2—ΔL—csharp
#78810 May 26

Find the second-highest salary in an employees table.

V1BetterV2—ΔL—csharp
#78710 May 26

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

V1BetterV2—ΔL—csharp
#78610 May 26

Use a window function to rank orders within each customer.

V1BetterV2—ΔL—csharp
#78510 May 26

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

V1BetterV2—ΔL—csharp
#78410 May 26

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

V1WorseV2—ΔL—csharp
#77910 May 26

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

V1WorseV2—ΔL—csharp
#77810 May 26

Convert 5 over 8 to a percentage.

V1BetterV2—ΔL—csharp