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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.
Same thing in my solution where I downcased twice, not necessary. Only had to be done once.
Iterate once. Keep track of x's and o's. Compare their length at the end.
n < 2n
so, could you show us what is the solution if we have a long string?