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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.
But there's no harm in doing that.
Its not optimal to get an array element by index twice, you can do it once per iteration of the loop
I don't think that sizeof(int) == sizeof(size_t) at all possible systems. So using "ini i" may cause owerflow.