Count Inversions Problem Statement

Given an integer array ARR of size N, your task is to find the total number of inversions that exist in the array.

An inversion is defined for a pair of integers in the array when both of the following conditions are met:

  • ARR[i] > ARR[j]
  • i < j

Here, i and j are indices ranging from 0 to N-1.

Example:

Input:
N = 5
ARR = [2, 4, 1, 3, 5]
Output:
3
Explanation:

The inversions are: (2, 1), (4, 1), (4, 3), and hence the output is 3.

Constraints:

  • 1 <= N <= 10^5
  • 1 <= ARR[i] <= 10^9
  • Time Limit: 1 sec
Note:
You are not required to print anything; it has been taken care of. Just implement the function to return the result.
AnswerBot
4mo

Count the total number of inversions in an integer array.

  • Iterate through the array and for each pair of indices i and j, check if ARR[i] > ARR[j] and i < j.

  • Use a nested loop to compare all pairs of el...read more

Help your peers!
Select
Add answer anonymously...

Siemens Software Developer interview questions & answers

A Software Developer was asked 10mo agoQ. Write a program to find duplicate elements in an array.
A Software Developer was asked Q. Write basic code.
A Software Developer was asked Q. Write a simple program.

Popular interview questions of Software Developer

A Software Developer was asked 10mo agoQ1. Write a program to find duplicate elements in an array.
A Software Developer was asked Q2. Write basic code.
A Software Developer was asked Q3. Write a simple program.
Siemens Software Developer Interview Questions
Stay ahead in your career. Get AmbitionBox app
play-icon
play-icon
qr-code
Trusted by over 1.5 Crore job seekers to find their right fit company
80 L+

Reviews

10L+

Interviews

4 Cr+

Salaries

1.5 Cr+

Users

Contribute to help millions

Made with ❤️ in India. Trademarks belong to their respective owners. All rights reserved © 2025 Info Edge (India) Ltd.

Follow Us
  • Youtube
  • Instagram
  • LinkedIn
  • Facebook
  • Twitter
Profile Image
Hello, Guest
AmbitionBox Employee Choice Awards 2025
Winners announced!
awards-icon
Contribute to help millions!
Write a review
Write a review
Share interview
Share interview
Contribute salary
Contribute salary
Add office photos
Add office photos
Add office benefits
Add office benefits