Bloomberg Software Engineer(Internship) interview questions

I had a phone technical interview first. I was asked two questions. It took less than an hour. Afterwards I was invited to attend the onsite interview (virtually). In the virtual interview, there was connectivity issue which took for around 15 minutes to be fixed. I wasn't given extra time for that. The first interviewer was not patient. Was making faces while I was explaining my solution approach. Second interviewer was nice, but very difficult to understand. However, he asked how would I rate my skill in C++ (my coding language for the interview). I said 7. He didn't ask question from C++. But in the rejection email, I was told to increase proficiency in the language of coding.

Reached out by HR to schedule 15 min tech chat, the interviewer is also SDE. He went through the resume, asked about one data structure, and the difficulties met in prev internships.