Welcome to your interview.
The question is on your right: Single-Transaction Max Profit. 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 an array of integers representing historical energy prices, write an algorithm to find the maximum profit you could make by buying and selling a single asset.