Since I can't tell from the test suite, do you wrap around the matrix when you are calculating the products? For example, when doing the products of four consecutive numbers in the up/down direction, do you do rows 1:4, 2:5, 3:6, 4:7...7:10 and stop there, or do you include the row combinations [8:10 1], [9:10 1:2] and [10 1:3]?
Just submitted my solution (slightly modified from the original Project Euler problem! :-), and the values do not wrap around in any direction.
I vaguely remember there was an earlier problem exactly the same as this one on Cody, and I solved that problem some time ago. But couldn't find the old problem....
All diagonals and reverse diagonals must be tested if you are wondering as I were once.
I don't understand why my solution is wrong. When I manually check it, it works good.
Find the sum of the elements in the "second" diagonal
Back to basics 20 - singleton dimensions
Compute a dot product of two vectors x and y
Make roundn function
Project Euler: Problem 14, Longest Collatz sequence
Project Euler: Problem 18, Maximum path sum I
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