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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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Duplicate issue.
Not an issue
Nothing can be changed after 500+ solutions have passed.
The solution is to go back to the drawing board and think of an algorithm which requires less memory.
If you are making an array of numbers from 1 to x, you are doing it wrong.