ッUSA MAGAッ
The NR question was a 3-4 part question from memory. Personally, I didn't finish it and I don't think it matters too much.
The challenge my group got was fairly easy but while I was waiting for the 1-1 interviews I spoke to a girl in the group before me and she said her group had a robotics one and didn't end up completing it. Again, I don't think it matters too much as long as you show strong leadership because my friend was also in that group and he ended up getting a first round offer.