Microsoft Intern interview questions

They asked a basic bfs traversal followed by follow up line intersection traversal. There was only a single round i recieved the rejection mail after 2 month. The interviewer was very calm but didn't help me in giving hint for the follow-up.

totally 3 round, they are really nice and chill. online interview. the HR will send the email and call you on phone to confirm the date and time. introduce yourself, talk about cv, please compare microsoft vs competitors, which area does the microsoft do better