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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.
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Hahahahaha great !
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Thank you, i found a way that gives me b by using sum and a and O(n) works perfectly. Thanks
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So how is possible to look up all substrings of an str in single for loop ? The other idea is that maybe it should think as a cluster and we can find the sub clusters which has only vowels etc but still not decide correct algorithm
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