Given a matrix, return the sum of all the elements across the diagonals.
E.g. A = [1 2 3; 4 5 6; 7 8 9;]
then, sum = 25 as sum of (1, 3, 7, 9,5)
Basically the same as Problem 1158
good!!
only the odds.
First time I see this notation.
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