493. Reverse Pairs
Given an integer array nums, return the number ofreverse pairsin the array. (link)
A reverse pair is a pair (i, j) where:
0 <= i < j < nums.length and
nums[i] > 2 * nums[j].
Example 1:
Input: nums = [1,3,2,3,1]
Output: 2
Explanation: The reverse ...
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