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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.
Get started now by creating a new collection.
I had to Google what LGTM stood for hahaha :-)
Are you sure you are generating the correct permutations? Even though it is only 3 numbers, generating permutations can get tricky. You can check the doc for the built-in permutation, you might even find something else that is helpful.
Like other 3 kyu kata, this problem requires that you start to dig a little deep into algorithmic and performance optimization.
I haven't solved this particular exercise myself, but I've implemented Conway's Game of Life before and done some performance tuing. I found Chapter 17 and Chapter 18 of Michael Abrash's Graphics Programmer's Black Book to be helpful.
Which input values are in this test case?
Are you taking into account the fact that c is not always the largest side?