First round phone screening. Second round screen share. This was not done on any IDE one would use in the real-life environment but a chalkboard. The reason, "I wanted to see if the candidate can write on a whiteboard". Then I was asked about specific methods as I was solving the problem. So basically interviewer wanted me to know each and every method. No one can know each and every method by heart. All the engineer needs to know the route they should take, to begin with. That's why IDEs are created, to help the ease automation process. It's like knowing we have the wheels but instead pushing the car to see how accurately one would make a turn. I was asked to discuss the issue when there was basically nothing to discuss if you choose to use logic. Not everything needs a meeting and micromanagement doesn't work.