This site is useful for Olympiad preparation, but I think the polynomial problems should be replaced with functional equations and inequalities, because that's the kind of algebra needed on Olympiads. I am aware that Olympiad preparation is not the primary purpose of the site, but many of the users would like that change.
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I agree with you, Bojan. That this website is used for olympiad preparation. But I think in Indonesia, there are more polynomial problems than functional equations problem. There also inequalities problem in Indonesia.