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31447-extreme-countreversepairs
Extreme

Challenge Source: type-challenges/31447-extreme-countreversepairs

Given an integer array nums, return the number of reverse pairs in the array.

A reverse pair is a pair (i, j) where:

  • 0 <= i < j < nums.length and
  • nums[i] > nums[j].

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Test cases from: type-challenges/31447-extreme-countreversepairs/test-cases.ts
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<CountReversePairs<[5, 2, 6, 1]>, 4>>,
  Expect<Equal<CountReversePairs<[1, 2, 3, 4]>, 0>>,
  Expect<Equal<CountReversePairs<[-1, -1]>, 0>>,
  Expect<Equal<CountReversePairs<[-1]>, 0>>,
]