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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.
Kiwi-sia: you're printing the pointer to the ArrayList, that's not how you print it in Java, google how to do it properly.
On my side, the error messages look like this:
expected:<13> but was:<...>, the input is not printed. Can you post your code with a spoiler flag?I think you are not posting on the right kata. For Java the input is a list of integer pairs, declared as
ArrayList<int[]>, no string.