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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.
If this kind of optimization is a bottle neck for you, then you shouln't be using Python anyway over something like C
Yes, theoretically. Your solution is the best one (and very cheap for memory). Now, practically, using loops with conditional branches is something slow in general, and builtin functions like
splitandminare optimized in Python, so the benefice if probably not relevant for the inputs that are tested here. It would be interesting to benchmark this.