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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.
Is there a good site/book to learn regex?
this is truly elegant! but would it work for the input ("abcdefghi",3)? The way I see it, the output would be then "abc def ghi " whereas the correct solution should not contain the last space character. Or am I missing something?
Nice math. Why not just make n a long instead of an int?