Problem 45857. Doubling elements in a vector (★★)

(copy of prob. 1024)
Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
then
B = [ 1 1 5 5 8 8 ]
Avoid using for/while loops.

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42.4% Correct | 57.6% Incorrect
Last Solution submitted on Dec 28, 2023

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