Quiz(Ques 6) Fenwick Tree

#1

unable to understand what is described in ques

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#2

@hari_2425

  1. Order statistic tree - https://www.cs.yale.edu/homes/aspnes/pinewiki/OrderStatisticsTree.html
  2. rank(x) = number of elements in the tree that are less than x is self explanatory I believe

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#3

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