Counting Array Inversions Efficiently
Problem Specification
Given a sequence of n integers, compute the total number of inversions contained within the array. An inversion is formally defined as a pair of indices (i, j) satisfying i < j and A[i] > A[j].
Constraints & Limits
Sequence length: 1 ≤ n ≤ 10<sup>5</sup>
Element values: 0 ≤ A[i] ≤ 10<sup>9</ ...
Posted on Sat, 23 May 2026 18:36:57 +0000 by garydt