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About the links
Your Unseen / Attempted / Solved progress is stored only in this browser using local storage; it is not uploaded anywhere. IMO rows use the official IMO English problem PDF. For USAMO, USA TST, and USA TSTST, this site links to Evan Chen's public problem/solution archive because the MAA does not publish the committee's internal official solution files publicly. USEMO links point to the organizer's own PDFs. AoPS links go to the corresponding Wiki problem page where a stable page naming scheme exists; otherwise the button performs a targeted AoPS web search.