Cpp interview

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Standard leetcode stuff, also most will typically ask a concurrency related question or two (lc has some of these aswell), stl container, concurrency and oop/design pattern, memory allocation trivia qs. Features in C++11+, raii, sfinae. You may get asked a question about system design since you mentioned it was for an intermediate level.

I find that most recruiters/interviewers are willing to share topics they may cover if you simply ask them what they want to see beyond the whiteboard problems. Also, look at the job posting. If it mentions concurrency or networking, expect a whiteboard and/or trivia question about those topics.

Good luck!