Microsoft Software Developer - Internship interview questions

I was flown out to the final round of interviews in Redmond, WA. Questions are average difficulty, about the same level as easy-medium on leetcode. Did not enjoy my experience as my interviewers seems extremely bored the entire time and that made me uncomfortable during my entire session. They also weren't really engaged with the interview. I solved the technical questions but got a rejection without any explanation as to why.