Microsoft Software Engineer interview questions

I got a pre placement offer from Microsoft India when i was doing my internship there in May 2018. Once an IIT student gets a PPO from Microsoft he/she is eligible for on campus interview for Microsoft Redmond. I had a 1:1 interview. The interviewer flew from Microsoft Redmond. I was asked 4 questions and the interview was about 1-1.5 hrs. He saw my CV and we discussed it, mostly projects. I was asked DS, Algo problems with average difficulty and i had to write the code on paper and 2 difficult problems on OS.