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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Can't understand the idea of kata, why we can't go through the diagonals. It is the shortest way. In first test I got 3.74
Test solve([[1,2,3],[3,4,6,6,7],[8,9,10,12,5,6]]),72) have a bug.
If we use a little combinatoric knowledge and some fingers we will see this bug.
Original values in each array: [3,4,6] Ok, let's multiply them, result 3 * 4 = 12 * 6= 72.
But [1,2,3], [3,4,6,7],[8,9,10,12,5,6]
[1,3,[8,9,10,12,5,6]] = 6 23+23+17
[1,4,[8,9,10,12,5,6]] = 6
[1,6,[8,9,10,12,5]] = 5
[1,7,[8,9,10,12,5,6]] = 6
This is why, result( 23+23+17) should be 63
The perfect square for 9 is 16, 9+7, why we should add 16?
It isn't right description