MathWorks Software Engineer Internship interview questions

Brief phone interviews, coding interview, and an HR interview. The HR guy was already set to say no 2 minutes into the interview. They sent me the wrong interview offer letter somehow, something addressed to another person who didn't share any part of my name.

They did two interviews over the phone. The first was just personality and soft skill questions i.e. What was a challenge for you? What do you excel at most? The second interview was a technical interview and they asked me general questions about discrete math and basic programming problems. Some examples would be define a DAG, Set theory, pigeon-hole theory ect. For programming there was basic questions about the advantages of OOP and linklists.