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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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Yes, So I tried a loop within a loop and jumped n windows each run in inside loop, n being the student number. I think i screwed up while doing a close/open of the door.
Try it with a few small numbers on paper, and hopefully, you'll spot the pattern.
How do you optimise it ?