x = [1 2 4; 3 4 5; 5 6 7]
then y should be the sum of the diagonals of the matrix
y = 1 + 4 + 7 = 12
dooh ... the solution is in test suite
yeah, but it's a long one
Find relatively common elements in matrix rows
intersection of matrices
Sum the Digits of a Number
Matrix to column conversion
find the surface area of a cube
Replace May with April
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