Meta Software Engineer interview questions

got on-campus interview and I got a problem JUMP || in leetcode and I got onsite interview chance. I have four interview with software engineer. The most difficult thing is system design. they asked problem which can be solved by disjoint set problem. they asked a dynamic programming stuff, array, binary tree.

Applied from a career fair. Got an email a month later. They invited me to a social event and an on campus interview. The social event was held in a hotel next to the campus. Students could talk to the interviews in a casual setting, which somehow helps the interview on the next day. The interview was held on campus. The interview lasted for an hour.