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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.
algorithm
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Please use spoiler flag next time, your post was visible in the homepage.
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liked the way you think
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Wait, I really want to understand what's happening here. Could someone explain it to me? :D
I've also used Counter in my solution, but in slightly different way. I iterate over the first counter's items instead of the possible digits.