Welcome to your interview.
The question is on your right: Rectangle Edge Intersection Counting. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Given a set of rectangles and a set of vertical line segments, count how many places the vertical lines intersect the rectangle edges, ignoring edge-on-edge overlaps.