Bloomberg Senior Software Developer interview questions

It was a phone interview. The interviewer was working from home and his phone was not working properly so I had difficulty hearing him in parts. Then he began asking me questions about my resume. It looked like he hadn't even glanced it cos he said "I hope you know we are looking for c++ developers" whereas I'm a c#.net developer. Then he gave me a coding interview on screen that we both shared. It was a modified and complex version of binary search and i began that first but realized i wouldn't be able to finish because it was a complicated question so i needed to think through it, so instead i rubbed that and gave a basic one, solved it n improvised it. He accepted it but asked me why i didn't do binary search. i explained the logic i would use if i had to optimize it further with binary search. I think for a total time of 15 mins to code, it was a fairly long thought provoking coding question.