Problems from Olympiads

At this moment the archive contains 9309 problems.

International Competitions

There are 11 international competitions:

IMO	320
Austrian-Polish	229
Asian-Pacific	95
Balkan	100
Baltic Way	280
Cze-Pol-Slk Match	78
Hungary-Israel	106
Iberoamerican	144
Mediterranean	39
Nordic	96
Pan-African	30

National Competitions

The collection contains problems from the following 44 countries:

Austria	160
Belarus	232
Belgium	64
Bosnia & Hercegovina	78
Brazil	153
Bulgaria	686
Canada	238
China	140
Croatia	183
Czech Rep. & Slovakia	108
Estonia	72
Finland	16
France	123
Germany	293
Greece	104
Hong Kong	36
Hungary	132
India	227
Iran	176
Ireland	159
Israel	56

Italy	207
Japan	100
Macedonia, FYR	37
Mexico	58
Moldova	357
Mongolia	108
The Netherlands	56
Norway	32
Poland	528
Romania	414
Russia	670
Serbia	582
Slovenia	114
South Korea	130
Spain	130
Sweden	90
Switzerland	81
Taiwan	69
Turkey	159
Ukraine	129
Vietnam	305

How you can help

Any help is most welcome. This may include problems, solutions, and/or feedback about certain competitions.

If you want to provide problems, we are particularly interested in those on a dark background. We are generally very happy to receive national contests that are not yet offered on the site (such as those in other countries), although it may be a good idea to contact us first - some such contests are already waiting in a stack. The materials you send us should be in one of the following forms (in the order of preference):

A LaTeX file in English;
A file of any type in English;
A file in another language, if necessary: the major European languages and all Slavic languages are OK.

Your help will be duly acknowledged, and your contribution will probably appear on the site in as soon as one week!

One more thing: Statistically, in such a large set of problems some mistakes must occur. We try to reduce their number to a minimum. If you encounter any (for example, a senseless or wrong problem, a language mistake, a typo, etc.), please report it by writing us, and we‘ll correct it as soon as possible. Thanks to the following people for reporting mistakes:

Babis Stergiou, Do Hoang Giang, Ercole Suppa, Francesco Morandin, Hae In Lee, Harun Šiljak, Juergen Voigt, Krzysztof Gogolews, Liu Guocan, Matti Lehtinen, Phan Anh Do, Philipp Dorsek, Shayan Dashmiz, and Yair Mulian.