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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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Curious to learn about this O(n) sorting algorithm. how does it work ?
You need to import math.
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Main trick : use a table of past values to avoid a N^2 scanning
Nlog(N) complexity :-(
2N complexity plus lots of memory used...
Not so good - can easily reduce time by two by using range x,y,2 for the divisors or isprime loops...