Apple Internship interview questions

I got through 3 phone interviews, the whole process was positive and but I panicked in my last phone interview coding challenge. The interviewee was supportive and proving hints along the way.

there are 4 round interview: 1 HR interview and 3 round technical interview. The technical interview took 45 minutes every round. The interviewer comes from different groups and may ask different questions. Like the circuit basic knowledge and the algorithm questions.