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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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Why my programm compiles longer that 6sec? In my comp its work nice
Hello! In statemants I see:
"values always 0 or bigger"
but when I try to run my programm on test cases I see:
"uncaught exception: ErrorCall (Prelude.tail: empty list) (after 2 tests)
[]
-1"
Is there "[] -1" valid test?