Reverse Pairs Problem

Reverse Pairs Problem — ExecCode Hard DSA Practice

Solve the Reverse Pairs problem on ExecCode. Free online hard DSA practice in Data Structures and Algorithms. Write and run code in Java, C++, Python — no signup required to run.

Problem description

Imagine you're solving Reverse Pairs in a real system where you must be correct and efficient. Problem Given an integer array nums, return the number of important reverse pairs in the array. Input: Integer array Output: Count of reverse pairs Constraints: 1 <= n <= 510^4 Constraints 1 <= n <= 510^4

Examples

Input [1,3,2,3,1]; Output 2. Input [2,4,3,5,1]; Output 3

Constraints

1 <= n <= 5*10^4

Practice Reverse Pairs free on ExecCode. Browse DSA problems, topic map, and placement guides.