Output: The inversion count is 5

C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter8: Arrays And Strings
Section: Chapter Questions
Problem 24PE
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Given an array, find the total number of inversions of it. If (i < j) and (A[i] > A[j]), then pair (i, j) is called an inversion of an array A. We need to count all such pairs in the array.

For example,

Input:  A[] = [1, 9, 6, 4, 5]
 
Output: The inversion count is 5
 
There are 5 inversions in the array: (9, 6), (9, 4), (9, 5), (6, 4), (6, 5)
 
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