After rounds problems appear in the problemset and somehow get their difficulties after some time. How is the difficulty selected for a problem and what's the time needed for rating to be determined?
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I read a blog from mike, they are automatic(obviously not manual), depends on the number of solves by rating groups, he fitted a curve or something for it, there is a old blog for it. I think it takes a few days for ratings to come
It is calculate though the number of solves. If very few people solved a problem, it will receive high rating, and vice versa. Due to this, sometimes problems are severely overrated or underrated. I have seen some 1400 problems that feels like they should be 1800, and 1800 problems that feels like they are 1200.