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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 think this is a decent kata, but probably harder than 7kyu.
What an awesome kata! I had an ok Python solution that computed dbl_linear(60000) in about 500ms. However, the tests kept timing out, which forced me to come up with something better. When the aha moment finally came, it was over 10x faster than my original. I am glad the tests forced me to do better!