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this post was submitted on 11 Dec 2023
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Nope, because what you're doing is copying the entire sequence, reversing it, and pairing up each element left to right. There's no way to have any leftovers because the original sequence and the new reversed sequence have the same number of elements.
A perhaps less intuitive way of thinking of it is you start with a sequence of 1 up to N, which contains exactly N elements. The sequence from 1 to N and its reverse together contain 2N elements, which is by definition an even number, regardless of whether N is even or odd. Because it's even we can break it into pairs without leftovers.