Apple Developer interview questions

I applied through a recruiter, the whole process took 3 months. After 2 phone interviews, I was told to do an onsite interview. After that, the recruiter told me I did well but the opening is no longer available and asked me to do another onsite interview for another role. After the second onsite interview, the recruiter told me they'd like to give me an offer. Two weeks later, the recruiter told me they couldn't process me with the offer since the head count has been given to somewhere else. The interviewees are very nice and friendly. They ask me various questions from data structure, algorithm, to database, OO design etc. All these questions are not hard and make sense to me. (Except one interviewee gave me a bunch of Python3.* code printed on a piece of paper and asked me to give the output, I only use Python2.7, so I guess I gave the wrong answer to that question) However, the recruiting organize is a chaos, which makes me some kind of disappoint about Apple.

A pleasant process, but long interview with 6 people. The interview staff were friendly, but the interview was by no means easy. The whole interview took about 6 hours, and was quite exhasuting