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.
Sum the elements in either diagonal of a square matrix
Sum of the Matrix Elements
Summation of array
Roots of a quadratic equation.
Energy of an object
Linear system of equations
Create a constant offset.
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