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
Increment a number, given its digits
Project Euler: Problem 2, Sum of even Fibonacci
Find best placement for ordered dominoes (harder)
Add two numbers
Replace May with April
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