Microsoft Intern - Software Engineer interview questions

3 hour long interviews one after the other. The interviews were all technical with coding and similar but with three different people. The questions were very focused on data structures. You are given a problem/task and have to comment which structure you want to use for it and implement it. Even though the structures were some "simpler" ones like queues and hash maps it included recognizing, commenting and explaining of modifications to them so you can adapt their functionalities like priority queues and linked hash maps.