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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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The reference solution in Python is twice as slow as the "obvious" approach. The performance requirements are actually non-existant...
Edit: identical situation in JS, but it's even worse, as Giacomo's solution may time-out from time to time because of tests being too random (or his code being too bad).
Edit2: reference solution in Ruby is not twice as bad, but the performance requirements are still none :\
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it's rather an issue here: there are actually absolutely no perf requirements... I confess I'm tempted to retire it right now...