ABC Software Engineer (Swe II) interview questions

You should understand here, I couldn't think of what I was missing here, and my interview till now hadn't been so great either, I needed to get this right, I was utterly under pressure. I was being mocked, or was I? He was speaking to me in such a fast tone, It took me almost 3 whole seconds(and thats a lot of time) after he stopped speaking to make sense of what he just said. I couldn't even processes half the words..