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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 completely agree. Rounding down per iteration also introduces an error that increases with each iteration.
The description should specify the rounding mode. Guessing the rounding mode the author had in mind is a stupid task.
Darn, I should've looked for a library function when Knuth said that people often want all the permutations :D