Cisco Software Engineer interview questions

Typical leetcode question and basic knowledge of object oriented programming type questions. Had to type out the code on a shared screen and explain my thought process. Question and answer at the end.

There were multiple rounds. Each round was a technical round followed by the final HR round. The first round was written screening round. The process took about 1 month. Sadly there was no feedback from the in person round from the Interviewer and he appeared to be very sarcastic during the interview process