Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Filter AC, pass DC
Find the sum of the elements in the "second" diagonal
Do Fast Fourier Transformation
Deleting an element in a matrix
Divide by 4
Solving a quadratic equation
Divisors of an integer
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