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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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arithmetic progression formula is used here
there can be some faults in your algorithm, I have solved it by checking the description and rewriting the codes about JNZ. I just misunderstood the meaning of jnz. Hope helpful.
how clever the method it is!although I cannot understand why