If
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
disgusting!!
Get the area codes from a list of phone numbers
384 Solvers
139 Solvers
172 Solvers
155 Solvers
167 Solvers
Solution 929773
duuuuuuuh