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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.
Honestly, how do you come up with such an algorithm?
Fixed
Wow, we were thinking alike on this one!
In Go, the function is capitalised (ValidParentheses) in the test file but not in the solution file. This leads to errors when testing.