Recruiter submitted my resume for two groups. There was one phone and two face to face interviews per group. In each round I was asked to write code. Concepts and questions asked were basic but they would mostly keep grilling on same question a lot changing the problem statement a little here and there. I would advise candidates to go through basic concepts of C++, and be prepared to write code which is almost accurate on syntax and logic, like implementing smart pointers. And be prepared on whatever is mentioned on resume, projects and specific technical challenges faced. A few times the challenges I mentioned were turned into coding questions too. All in all, I dont think Bloomberg C++ interview is too difficult to prepare for, I wasnt asked complex puzzles checking how out-of-the-box can i think, they seem to be concerned if u can code or not, not if u r a code guru.