I sent a resume and was then called to a personal interview day. On the interview day, I talked with one of the recruiters, who explained the current situation of the company and its goals. Then, I had two separate interviews with different interviewers. In both interviews, the interviewer first asked questions about me and my previous experience, and then followed up with algorithm questions. I had to answer the questions with pencil and paper while explaining the process of my thinking.

Given two balanced binary trees, what is the intersection between the two balanced binary trees?

(What elements are in both trees?)