README_EN.md

493. Reverse Pairs

Description

Given an array nums, we call (i, j) an important reverse pair if i < j and nums[i] > 2*nums[j].

You need to return the number of important reverse pairs in the given array.

Example1:

Input: [1,3,2,3,1]

Output: 2

Example2:

Input: [2,4,3,5,1]

Output: 3

Note:

1. The length of the given array will not exceed 50,000.
2. All the numbers in the input array are in the range of 32-bit integer.

Solutions

Python3

Java

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