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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.
why use lambda? is this faster or better or what?
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My favorite one
Multiplication is still O(n**2), so...
Much more elegant, and quicker to write if you treat the values as strings instead of ints. Although if I'm not mistaken, with really huge numbers, this would be an o(n log n) solution vs o(n) storing freqs in a dict.