This is a usual tech phone screening question. You get two phone screens, and I failed on the second one. I assume if you pass it, the onsite interview would be pretty similar to other tech companies as well.

I have been in the industry for a while. I've interviewed with a lot of companies and have interviewed a lot of candidates as well. This Apple engineer was by far the worst interviewer I have ever seen. I won't be replying to Apple recruiters again.

This is a question straight out of LeetCode. It's medium difficulty, but it has a "trick" you have to realize.

If you've solved it before, it's easy if you had seen it before. It's really hard to solve for the first time, especially when the interviewer doesn't talk at all.