Package g0401_0500.s0493_reverse_pairs

Class Solution

java.lang.Object

g0401_0500.s0493_reverse_pairs.Solution

public class Solution
extends Object

493 - Reverse Pairs.<p>Hard</p> <p>Given an integer array <code>nums</code>, return <em>the number of <strong>reverse pairs</strong> in the array</em>.</p> <p>A reverse pair is a pair <code>(i, j)</code> where <code>0 <= i < j < nums.length</code> and <code>nums[i] > 2 * nums[j]</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> nums = [1,3,2,3,1]</p> <p><strong>Output:</strong> 2</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> nums = [2,4,3,5,1]</p> <p><strong>Output:</strong> 3</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= nums.length <= 5 * 10⁴</code></li> <li><code>-2³¹ <= nums[i] <= 2³¹ - 1</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Details

Solution

public Solution()

Method Details

reversePairs

public int reversePairs(int[] nums)