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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.
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OP solved it, closing
mapandreduceare two loop-alike methods, so your solution isn't O(n).What kind of problem? I tried google, and have seen that DP have a lot problems
Give an advice for solution please
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On your machine it also works incorrectly, but you perform your tests in a wrong way. Test it on your machine again, with two calls one after another, something like this:
Yes on my machine it work well and return correct array
Did you try to recreate this scenario locally in your IDE? Does it work the same way on your machine, so you could debug through it?
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