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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.
yep)
Even though they say return array not tuple test cases are passed.
Here you return tuple instead of array
It would be better to use ArrayDeque instead of java.util.Stack as suggested in multiple articles. By the way quite good and clear solution)
You're basically right, my bad