[danuker]

A bug-free one (nonexistent). :)

In seriousness, the interview is supposed to give a taste of how the candidate thinks and codes in general. If they start using every obscure language feature under the sun, I am not too sure they got the idea.

[wiseowise]

Do you seriously believe, that someone who can write stuff like this can’t write ordinary code?

[danuker]

There are a lot of leetcoders who can't work in a team.

Maybe they work well on their own, or maybe their solutions collapse when given a problem of a complexity greater than the leetcode problems.