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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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Really clever! Avoided so many unnecessary steps.
You would'n come into a situation to divide by ex. 9 or 14, cause you would've already divided the number by their prime decomposers 2, 3 and 7. Thus no need to check for primality.
technically correct, but i feel like the kata wanted us to find the gcd and not import a library to do it for us
wow...simple, fast and doesnt involve any nonsense... This is the best solution
sorry
but i found there is a littel mistake here
it doesn't work for "11+1??=111", it should be 0 but it gives -1
something wrong about the "??" part
The for loop starts from the first prime number (2) and if n would be divisible by non-prime i, it also means that it is divisible by i prime factors. So n would be reduced (n /= i) in earlier loop steps, n % i == 0 can be true only for prime i because of it.
Very nice!