Package g0401_0500.s0493_reverse_pairs

Class Solution

java.lang.Object
g0401_0500.s0493_reverse_pairs.Solution
public class Solution extends java.lang.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
    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)