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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 problem you linked is more difficult than this problem as it requires you to account for more complex parentheses and also negative values.
It is more than likely that if someone tried to use an answer from the current problem on the one you linked they would find themselves having to re-write much of their code.