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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.
Your solution being too slow is not a kata issue.
If inputs are not presented to you on failure you can print them yourself. See this and this paragraph of troubleshooting guide to see how.
Yes, just that.
Your solution being too slow is not a kata issue.
Your solution produces correct resutls, that's why it passes some tests. However, it's not efficient enough, that's why it passes only 3 tests out of 50.