I had a second phone interview because I could not solve the problem at the first interview, but I implemented it very well. At the second interview, I missed one restriction, and my interviewer didn't warn me. I guess he also missed it while I was implementing. One week later, my recruiter said my code couldn't solve one restriction and that, because of that, I failed.

N different couples go to the cinema with 2N different seats. They take their places randomly. You can make swap operations. Write a code for the given input that determines the minimum number of swap operations for seating all couples with their partners. Additionally, ensure that no one swaps more than twice.