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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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Why does the length of the marked array have to be m+1?
So this is a generalized version of this? https://en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E2%8B%AF
I assume the (n+1) factor signifies what you're saying is (firstNum + lastNum)
Can you explain how your algorithm for expect works?