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This video explains how to find number of inversions in an array using 3 methods. The video first explains what is inversion and its conditions followed by solutions. The first solution is a brute-force method. The second solution is based on merge sort technique. The third technique is based on multiset using c++ STL. If you find any difficulty or have any query then do COMMENT below. PLEASE help our channel by SUBSCRIBING and LIKE our video if you found it helpful...CYA :)