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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
#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
#77710 May 26

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

V1WorseV2—ΔL—csharp
#77610 May 26

Simplify the expression 3x squared times 4x cubed.

V1WorseV2—ΔL—csharp
#77510 May 26

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

V1BetterV2—ΔL—csharp
#77410 May 26

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

V1BetterV2—ΔL—csharp
#77310 May 26

What is the greatest common divisor of 36 and 48?

V1WorseV2—ΔL—csharp
#77210 May 26

Calculate 25 squared minus 24 squared.

V1WorseV2—ΔL—csharp
#77110 May 26

Round 4.7836 to two decimal places.

V1BetterV2—ΔL—csharp
#77010 May 26

What is 15 percent of 80?

V1BetterV2—ΔL—csharp
#76910 May 26

Find x: 5 times the quantity x minus 3 equals 20

V1SameV2—ΔL—csharp