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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 think he did it because we can use "Liters" as a variable.
because we are converting int to string.
The hardest things in this kata is knowing how sorting works differently depending on data type. After that it is fairly simple with a bit of string and array knowledge.
I never thought a 7 kyu problem will be this hard.