Walmart Labs was using a recruiting company to source candidates for interviews. There was no initial phone screen. My experience consisted of a single in-person interview.

I was ushered into a room with a very tired, disgruntled employee. He posed one extremely difficult, logic-based question. When I couldn't answer, he treated me like a moron.

I asked him for the solution to the problem. He was incredulous that I asked, despite my admitting I couldn't figure it out. He then proceeded to answer the question incorrectly himself. (After thinking about it after the interview, his answer was wrong.)

I would not want to work with someone like this.

You have 25 electronic horses. You don't have any way of measuring time.

You have a racetrack with 5 lanes so that you can race the horses against each other.

What is the least number of races required to find the top 3 fastest horses?