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Dương Quốc Bình đã viết:Cám ơn anh. Em đã xem rồi nhưng sao trong đó toàn viết bằng tiếng anh.
Since 1975 each competition has two papers of 3 questions. Before that there were fewer questions. The first competition was held in 1962, giving 220 problems to date.
Many thanks to Le Thai Hoang for help in providing and translating 1980-1999 and to Hung Ha Duy for providing and translating 1962-1979 and 2000-3.
http://www.kalva.demon.co.uk đã viết:This site currently includes about 3,700 olympiad problems and about 900 other problems. I have given solutions for about 1,300 Olympiad problems (and almost all the Putnam problems). My ultimate objective is to include a wide variety of interesting problems of all levels of difficulty. In general, I have no interest in pure bookwork problems.
Two features about the site are unusual. The first is that I strive for completeness. There are often many sites that give the last few years' problems for an olympiad, but this is usually the only site that gives all the problems. The second is that I try to put up solutions. Inevitably solutions will lag the problems, maybe by years!