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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.
Adding more sophisticated tests would also force a change in requirements. Even then, the change adds maybe 3 lines to the required code.
yes you're right..tests are too easy
Print inputs and you will see failing tests. Hidden tests are by definition hidden, sorry for that but it is the normal rule:-(
Actually, the rules of 'sliding' are shown in description, and there the condition mentioned above is clear
The text representation of the pyramid is not well aligned. In this alignment, you are only allowed to go straight-down or right-down, not left-down.