Problem 43682. Pairwise column flip
Given matrix M_in, flip every pair of columns. So if M_in is
1 2 3 4 1 2 3 4
then M_out is
2 1 4 3 2 1 4 3
Note: if M_in has odd number of columns, the last column should remain unchanged. So if M_in is
17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9
then M_out is
24 17 8 1 15 5 23 14 7 16 6 4 20 13 22 12 10 21 19 3 18 11 2 25 9
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