Count the number of primes less than 'n'.
Nice test cases!
With a more robust Test Suite many/most of the submissions would fail for ignoring the Problem Statement instruction that primes must be less than n. Please add test cases in which the input x (or "n") is itself a prime.
Get the length of a given vector
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Matrix to column conversion
Sum of cubes
Calculate some equation
kmph to mph converter
Roots of a quadratic equation.
Energy of an object
Create a constant offset.
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