Microsoft Internship, Software Developer interview questions

Resume screen then an easy OA. There were two back-to-back interviews where there were behaviourals for the first 15 minutes and then they asked me a difficult LeetCode question on graphs and I think it was finding redundant connections.

The interview process had 3 rounds First, it was a technical test with 2 coding problems Second, it was a phone interview for 30 minutes. For some reason, I haven't received one. Third, it was a 3-round long interview with 45 minutes per round and a 15-minute break. The first round, I had to solve a coding problem. After I was done, my problem was slightly modified and I was asked how to solve the modified version. The second round, I was asked about the projects from my CV and I was asked a data structure question (How to design a smart elevator). Third round included OOP basic questions. It was quite exhausting.