Question: An inversion in an array A[1 n] is a pair of indices i, j such that i A[j]. The number of inversions in an n-element

An inversion in an array A[1 n] is a pair of

An inversion in an array A[1 n] is a pair of indices i, j such that i A[j]. The number of inversions in an n-element array is between 0 (if the array is sorted) and (n 2) (if the array is sorted backward). Describe and analyze an algorithm to count the number of inversions in an n-element array in O(n log n) time

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