Bloomberg Software Developer interview questions

A recruiter forwarded me the role. Setup a 60 minute phone and HackerRank assessment. The interviewer introduced himself, I talked about my resume and past positions, then he pasted in one problem (see below). I had to think about it for a few minutes before I thought of a solution. During that time, the interviewer kept interrupting me asking if I had a solution or not. Eventually I did and I coded it out. Then he asked for a few more additional features, which I coded without any hesitation. By then the 60 minutes was almost up, and I asked a few questions about the role and environment there. Seemed to go well except for the impatience right after giving me the technical problem.

On-campus--> Phone Interview --> Onsite(one system design + one algorithm) Algorithm problems are easy levels in Leetcode, system design is quite confusing... Company tour is good, 2 round in on-site