Find significant inversions in the input sequence

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Reference no: EM1327947

You are given a sequence of n distinct numbers A1, ... , An. An inversion is a pair i < j such that Ai > Aj. Call a pair (i, j) a significant inversion if i < j and Ai > 2*Aj. Give an O(n*log(n)) algorithm to count the number of significant inversions in the input sequence.

Reference no: EM1327947

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