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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 is not best practice. With each level you are filling a new vector. Why not just keep a global sub vector that you increment by one element each iteration?
This is obviously a very elegant solution but wouldn't this be O(n^2)?
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