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C++ questions come up in quant developer and low-latency engineering loops: language semantics, memory, performance and the occasional systems design question.
PuzzledQuant has 131 C++ problems: 55 easy, 54 medium and 22 hard. The firms they are most often tagged with are Headlands Technologies, Jump Trading and Citadel. 40 are free to solve, and the other 91 are part of Premium.
For the techniques behind these problems, with worked examples, read C++ for Quant Trading: A Step-by-Step Roadmap.
To track your progress or combine this with other filters, open the full problem list. Problems marked with a lock are part of Premium.