Welcome to your interview.
The question is on your right: Optimize Array or String to Log Time. 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.
Solve a classic array or string manipulation problem and optimize your solution from O(N) to O(log N) or O(sqrt(N)) complexity.