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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 got as far as reading about numerical calculus and Lambert W functions before I realized a constant-time solution probably wasn't going to happen.
Wouldn't that depend on what your expected behavior on having a non-integer input is? Depending on context, returning without raising an exception could just create problems.