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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.
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this is a prime example of why floating-point numbers should never be used to represent monetary amounts. the problem is that the reference solution does
111.0 // 3.7
to calculate the total number of beers, which yields29.0
, not30
;floor(111.0 / 3.7)
would yield30
.Before sorting an array be sure it can be sorted.