Bloomberg Intern interview questions

I applied trough campus recruiting for my university's job fair. In a few days they got back to me with where and when the interview would be scheduled. It was an interview with two women, one working in HR and the other who has just previously been hired after her internship, which allowed me to ask her some questions.

Was asked questions on data structures basically. Trees, linked lists, circular linked lists. How to identify repeat elements in a circular linked list. How to identify if the linked list was circular.