Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the examples below.
Examples:
Input n = 3 Output a = [ 1 2 3 6 5 4 7 8 9 ]
Input n = 4 Output a = [ 1 2 3 4 8 7 6 5 9 10 11 12 16 15 14 13 ]
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