g0401_0500.s0493_reverse_pairs

Class Solution

java.lang.Object

g0401_0500.s0493_reverse_pairs.Solution

public class Solution
extends Object

493 - Reverse Pairs.

Hard

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] > 2 * nums[j].

Example 1:

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

Output: 2

Example 2:

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

Output: 3

Constraints:

• 1 <= nums.length <= 5 * 104
• -231 <= nums[i] <= 231 - 1

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	reversePairs(int[] nums)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

reversePairs

public int reversePairs(int[] nums)