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)

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Last Solution submitted on Apr 14, 2026

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Etienne Matthew Bolyard 贵林 Lorenzo

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