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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.
The user's already solved the kata.
Post your code in a comment with a spoiler tag. Nobody will be able to help you if all you say is "something's wrong".
Although the tree traversal meant to be used here is not inherently a BST property, its output is, which is the key to the solution.
Incorrect.
This is not a kata issue. And we can't change the rank. I agree 7kyu seems too low for this one.