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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.
minor correction: use const reference, to make sure you are not changing anything on the data structure.
Whenever passing vectors, or any STL data structure to a function, always use references.
Use Pass by reference instead of Pass by Value.
This would reduce the time in copying your vector.