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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.
<another encouraging comment/>Sleep over it. You can do it
You would better add "minimal" before "number".
return the "minimal" number of parenthesis reversals needed to make balanced parenthesis.
After all,there are several ways to make balanced parenthesis.
Thanks! i will try for one more day.
Not really. Keep at it. You'll crack it.
It's hard