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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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ninja style)
Даже не подумал о таком варианте
It makes no sense to get answer -1 in the Sample Test 4.... how can you get a negative answer when dealing with students? What does actually "-1 student finished both homework" mean?
The portions with the Math.PI end up cancelling out in this particular question. Try working it out with paper and pencil and you'll see.
I am quite confused with the answer. Shouldn't the answer contain a Math.PI in itself, since it is a necessary value to calculate area of a circle?
we are thinking alike!