I used the linked-list question for years as well. I think our phone screen was harder -- it probably only filtered out about 60%-75% of our applicants rather

I used the linked-list question for years as well. I think our phone screen was harder -- it probably only filtered out about 60%-75% of our applicants rather than 95%. It's a good one. I have an awesome follow-up to it that it sounds like your interviewees would never get to anyway :-)