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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.
I'd recommend storing the size of the initial array to avoid recalculating it every time we drop 1 element.
Sometimes when you are checking your solution by printing out each one of the instrutions make the buffer to get full. That is why the system tells it is timed out. Same thing happened to me, so I deleted the cout. All the problem got fixed.