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Finding an exercise that illustrates loops and runs cleanly in the test runner has been a problem. This one feels quite contrived in places, but it's the best I've got at present.
Students are free to implement this in other ways, but will likely not be aware of
cumsum()
orlapply()
at this point in the syllabus. Also: I tried using these in a test implementation, and it needed lots ofif
statements to handle all the edge cases.