Construct a matrix whose elements begin from 1 and end at n^2 with the order of arrangement as shown below:
For:
n = 4
output
M = [1 2 6 7; 3 5 8 13; 4 9 12 14; 10 11 15 16]
Note the elements increase and decrease along alternating diagonals with the last element being always n^2.
Additional test cases have been added.
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