We sit the candidate down, and present them with a task. Then we all sit down as a team and work the problem. The most recent one was building a game of marbles. None of us knew the rules of marbles, but the candidate knew how to take a vague task and work with the team to produce something functional.
Which is what the job is. We ask the candidate to show us that they can do the job and then hire whoever 1) did the best work and 2) vibed with the team.
Anyone who places real value on leetcode is not someone who should be managing programmers because that's not the job. In precisely zero real-world situations does any programmer need to be able to write a red/black tree blindfolded on a whiteboard standing on one leg and signing the national anthem. In the real world you just grab the algorithm out of a book or stack overflow.