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Hudson River Trading Interview Questions

Not sure how many of you are interested in tech roles in finance (shared Goldman questions earlier) but here are some questions I got during interviews at Hudson River Trading:

What are the pros and cons of using array vs. linked list?
How do you use virtual table and virtual pointer in C++?
Please describe how you would weight and delete certain features in a model? How would you recalibrate?
What is the difference between stack and heap memory? When would you use what?

Thanks for sharing these with the community!