The 60-minute phone interview took place on HackerRank. The interviewer immediately began with programming questions that were vague and offered little explanation about what they were looking for. Some of the questions didn't make sense, and the interviewer did not clarify them.

After the interview ended, I experienced no follow-up whatsoever. I found the entire experience to be very unprofessional.

Implement a queue and make it thread-safe.

Given a singly linked list, write a function to pop a node in less than O(n) without using extra memory, given this interface: void pop(Node * node);

What is a zombie process?

What does the static keyword mean in C?

What types of thread protection exist besides critical section, mutex, and semaphore?