Problem 2031. Half-Swap
Given a vector with an even number of elements, rearrange it so that the elements in its first half are switched with those in the second half.
For example, given a vector:
Vec = [23 24 6 15 15 20 22 23 9 21]
will result in
Vec = [20 22 23 9 21 23 24 6 15 15]
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