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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.
This test is to prevent inefficient/slow solutions and force you to use an efficient algorithm. If you use the right algorithm you have a lot of headroom to pass the tests in all languages even if your implementation isn't good.
"Testing for 29977643211 (No brute force solutions 🙃)" - get this issue with different solutions