Binary Index Tree(BIT)

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Special for Query search and update, work same as segment tree.

Tutorial:
https://www.youtube.com/watch?v=aAALKHLeexw

Problem :
https://toph.co/p/easy-prime
https://toph.co/p/another-query-on-string
https://toph.co/p/rivalry-friends(long long matters in return type)

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