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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.
Given f(x) = (x - 4) / 3, state the inverse function f^(-1)(x). Give the inverse in explicit form.
State the distributive law of intersection over union for three sets A, B, C. Give the identity in set notation.
Compute the sum of the arithmetic series 3 + 7 + 11 + ... + 99. Give the exact integer.
State De Morgan's laws for two sets A and B. Give both identities in set notation.
A factory produces widgets and 2% are defective. If you sample 50 widgets, what is the probability that exactly 1 is defective?
Define an interface IShape with one method Area(). Implement Circle and Rectangle records. Show a List<IShape> being summed via LINQ Sum.
Write an extension method on IEnumerable<T> called 'Chunk(int size)' that yields IEnumerable<T> chunks of the given size. Do not call the built-in Enumerable.Chunk.
Implement IComparable<T> on a 'SemVer' struct (Major, Minor, Patch). Show sorting a List<SemVer>.
Given a List<int>, return a new list containing only the even numbers, each squared, using LINQ method syntax (Where + Select). One line.
Write a generic Swap<T> method that swaps two ref T parameters. Include an example call with two ints.
Write a generic Swap<T> method that swaps two ref T parameters. Include an example call with two ints.
Write a self-join to find pairs of employees with the same manager.
Find x: 5 times the quantity x minus 3 equals 20
What is 17 times 24?
Write a method that returns IEnumerable<int> using yield return for the first 10 squares.
Write a class with a constructor that takes one parameter and assigns it to a readonly field.
Sort a list of integers in descending order using OrderByDescending.
Write a foreach loop that prints each item in a list.
Calculate the gap in days between consecutive logins per user using LAG.
Find the median salary in each department using window functions.
What is the next term in the sequence 2, 6, 18, 54?
What is the greatest common divisor of 36 and 48?
If x plus y equals 10 and x minus y equals 4, what are x and y?
Round 4.7836 to two decimal places.