First interview Datadog full time

I have my first interview this week. I see that people have gotten different levels of difficulties. Is there anyone who interviews recently? What was your experience?

Sample recent questions:

  1. you have coins [1,5,10,25]. Use the least number of combinations to get 33.
  2. maximum path sum between two leaves of a binary tree
    I believe the second is hard but they usually give mediums. Good luck!