Loading collection data...
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.
maybe your problem was this. "if functions mean or variance have as parameter town a city which has no records return -1 or -1.0 (depending on the language)"
mine was :D
My bad, I've realized that after an hour. I was just going to remove the question.
For the attempt, elements inside the arrays are not strings. Is this a part of kata or just a mistake?
This comment is hidden because it contains spoiler information about the solution