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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.
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i've been stuck at this problem for a day now. My solution is O(sqrt(n)) and it's still failing. A little hint wouldn't hurt anyone. Please help.
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Can you explain how maps would be more efficient at these sort of problems?