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 ]
Back to basics 15 - Benchmark
Determine Whether an array is empty
Dimensions of a rectangle
Find out sum of all elements of given Matrix
Divisors of an integer
Solving a quadratic equation
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