Is it -all- work sample based? Or does leetcode come into the picture somewhere? (BTW, does that mean homework? Just want to clarify. Something like "build thi

Is it -all- work sample based? Or does leetcode come into the picture somewhere? (BTW, does that mean homework? Just want to clarify. Something like "build this feature or write a function that does this" kind of thing?) How about the on-site? What do they make you do there?