I would have expected HW to be only a small proportion, but I'd also expect think terms like "pointers, algorithm, recursion" to be much more common for HW. If

I would have expected HW to be only a small proportion, but I'd also expect think terms like "pointers, algorithm, recursion" to be much more common for HW. If Hw, would correlate annually with semesters (noting that SO is internationally popular, and different countries have different schedules).