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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.
It should never be assumed that the last name comes after the first name; this is locale-dependent (and even the fact that a person always has first and last names, but that's a different story).
The output could be a simple Boolean...
Finally a solution using a closed form expression instead of an unnecessary sum!
Could be improved by caching the previous result and just multiplying it by 2 instead of calculating the whole 2^n.
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This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution