[YjSe2GMQ]

I did use BFS/DFS or things like find/union in my job. But I'd say it's mostly about how quickly you can wrap your head around abstract concepts.

An analogy from finance: if you take a pen and a paper, and think about it for a few minutes it'll be clear that buying a stock and a put option is equivalent to buying a call option (and a bond, since you're also locking in some capital). This is fine, and most people can do that. But the brilliance happens only when such things are immediately obvious to you, in the same manner as you don't need to consciously decode English while reading this sentence. It's another question whether this or that particular company really needs brilliance.