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.
Solve

Solution Stats

43.36% Correct | 56.64% Incorrect
Last Solution submitted on Sep 04, 2025

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