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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.
letter is not used?
Yes, this solution isn't exactly best practice even if it is syntactically short.
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How many words out there have 5000 letters?
isn't calling count on every character equal to a loop that iterates the whole array every time?
The number of letters in a word is not an arbitrarily large number, it's bounded at ~30 on the high end.
Agreed. This ends up running O(n^2), when a time/space tradeoff can make it O(2n).
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