Neither your nor my solution would meet that criteria.
OP's solution meets the criterium you're de-obfuscating (only for an even number of columns, BTW, but the example assumes this). OP performs pair swapping, assuring that each column is swapped exactly once with a peer
column. I think this is also the reason why OP is speaking C-ish: s?he needs to keep control over the indexes in @cols
Flavio (perl -e 'print(scalar(reverse("\nti.xittelop\@oivalf")))')
Don't fool yourself.
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