[HackerEarth] Rahul has recently learnt about array inversions. An array a has N integers, indexed from 0 to N - 1. Formally, the number of inversions is the number of pairs (i, j) such that 0 ≤ i a - 题解

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题号 P19561
标题 [HackerEarth] Rahul has recently learnt about array inversions. An array a has N integers, indexed from 0 to N - 1. Formally, the number of inversions is the number of pairs (i, j) such that 0 ≤ i a
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