Honestly being the interviewer can be just as hard as being the interviewee. You really have to pay as close attention as if you were doing the problem yourself. Prepare yourself mentally for a solid 30-60 min of being 100% on. If you go in thinking you can slide through while the other person works neither of you will get much out of it.
I also find it's a good idea to always come prepared with questions ahead of time so at least if you run out of ideas of things to ask you can just go off the questions you wrote down.
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Honestly being the interviewer can be just as hard as being the interviewee. You really have to pay as close attention as if you were doing the problem yourself. Prepare yourself mentally for a solid 30-60 min of being 100% on. If you go in thinking you can slide through while the other person works neither of you will get much out of it.
I also find it's a good idea to always come prepared with questions ahead of time so at least if you run out of ideas of things to ask you can just go off the questions you wrote down.