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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.
I feel like the most common definition of a BST has all of the left nodes <= the root node and all right nodes > the root node (ascending order). Allowing descending order BSTs is a nice twist but I think it should be mentioned in the instructions.
So is
[3, 2, 1]not a sorted list?