Difference between revisions of "IMO Problems and Solutions"

 
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== 1968 ==
 
== 1968 ==
  
* [[1968 IMO]] (in USSR)
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* [[1968 IMO]] (in Russia)
 
* [[1968 IMO Problems/Problem 1 | Problem 1]] proposed by Unknown Author, Romania (taken from a Romanian problem book)
 
* [[1968 IMO Problems/Problem 1 | Problem 1]] proposed by Unknown Author, Romania (taken from a Romanian problem book)
 
* [[1968 IMO Problems/Problem 2 | Problem 2]] proposed by Czechoslovakia
 
* [[1968 IMO Problems/Problem 2 | Problem 2]] proposed by Czechoslovakia
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== 1979 ==
 
== 1979 ==
  
* [[1979 IMO]] (in United Kingdom)
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* [[1979 IMO]] (in the United Kingdom)
 
* [[1979 IMO Problems/Problem 1 | Problem 1]] proposed by Arthur Engel, West Germany
 
* [[1979 IMO Problems/Problem 1 | Problem 1]] proposed by Arthur Engel, West Germany
 
* [[1979 IMO Problems/Problem 2 | Problem 2]] proposed by Nickolay Khadzhiivanov and Nedjalko Nenov, Bulgaria
 
* [[1979 IMO Problems/Problem 2 | Problem 2]] proposed by Nickolay Khadzhiivanov and Nedjalko Nenov, Bulgaria
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== 2002 ==
 
== 2002 ==
  
* [[2002 IMO]] (in United Kingdom)
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* [[2002 IMO]] (in the United Kingdom)
 
* [[2002 IMO Problems/Problem 1 | Problem 1 (C1)]] proposed by Federico Ardila, Colombia
 
* [[2002 IMO Problems/Problem 1 | Problem 1 (C1)]] proposed by Federico Ardila, Colombia
 
* [[2002 IMO Problems/Problem 2 | Problem 2 (G3)]] proposed by Hojoo Lee, South Korea
 
* [[2002 IMO Problems/Problem 2 | Problem 2 (G3)]] proposed by Hojoo Lee, South Korea
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* [[2006 IMO Problems/Problem 4 | Problem 4 (N1)]] proposed by Zuming Feng, USA
 
* [[2006 IMO Problems/Problem 4 | Problem 4 (N1)]] proposed by Zuming Feng, USA
 
* [[2006 IMO Problems/Problem 5 | Problem 5 (N4)]] proposed by Dan Schwarz, Romania
 
* [[2006 IMO Problems/Problem 5 | Problem 5 (N4)]] proposed by Dan Schwarz, Romania
* [[2006 IMO Problems/Problem 6 | Problem 6 G(10)]] proposed by Dušan Djukić, Serbia
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* [[2006 IMO Problems/Problem 6 | Problem 6 (G10)]] proposed by Dušan Djukić, Serbia
  
 
== 2007 ==
 
== 2007 ==
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* [[2010 IMO Problems/Problem 4 | Problem 4 (G2)]] proposed by Marcin Kuczma, Poland
 
* [[2010 IMO Problems/Problem 4 | Problem 4 (G2)]] proposed by Marcin Kuczma, Poland
 
* [[2010 IMO Problems/Problem 5 | Problem 5 (C4)]] proposed by Hans Zantema, Netherlands
 
* [[2010 IMO Problems/Problem 5 | Problem 5 (C4)]] proposed by Hans Zantema, Netherlands
* [[2010 IMO Problems/Problem 6 | Problem 6 (A7)]] proposed by Morteza Saghafiyan, Iran
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* [[2010 IMO Problems/Problem 6 | Problem 6 (A7)]] proposed by Morteza Saghafiyan, Iran, Answer by Aadi
  
 
== 2011 ==
 
== 2011 ==
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== 2019 ==
 
== 2019 ==
  
* [[2019 IMO]] (in England)
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* [[2019 IMO]] (in the United Kingdom)
 
* [[2019 IMO Problems/Problem 1 | Problem 1 (A1)]] proposed by Liam Baker, South Africa
 
* [[2019 IMO Problems/Problem 1 | Problem 1 (A1)]] proposed by Liam Baker, South Africa
 
* [[2019 IMO Problems/Problem 2 | Problem 2 (G3)]] proposed by Anton Trygub, Ukraine
 
* [[2019 IMO Problems/Problem 2 | Problem 2 (G3)]] proposed by Anton Trygub, Ukraine
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* [[2019 IMO Problems/Problem 5 | Problem 5 (C3)]] proposed by David Altizio, USA  
 
* [[2019 IMO Problems/Problem 5 | Problem 5 (C3)]] proposed by David Altizio, USA  
 
* [[2019 IMO Problems/Problem 6 | Problem 6 (G7)]] proposed by Anant Mudgal, India
 
* [[2019 IMO Problems/Problem 6 | Problem 6 (G7)]] proposed by Anant Mudgal, India
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 +
== 2020 ==
 +
 +
* [[2020 IMO]] (in Russia / virtual)
 +
* [[2020 IMO Problems/Problem 1 | Problem 1 (G2)]] proposed by Dominik Burek, Poland
 +
* [[2020 IMO Problems/Problem 2 | Problem 2 (A4)]] proposed by Stijn Cambie, Belgium
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* [[2020 IMO Problems/Problem 3 | Problem 3 (C6)]] proposed by Milan Haiman and Carl Schildkraut, Hungary
 +
* [[2020 IMO Problems/Problem 4 | Problem 4 (C3)]] proposed by Tejaswi Navrinarekallu, India
 +
* [[2020 IMO Problems/Problem 5 | Problem 5 (N3)]] proposed by Oleg Košik, Estonia
 +
* [[2020 IMO Problems/Problem 6 | Problem 6 (G9)]] proposed by Ting-Feng Lin and Hung-Hsun Hans Yu, Taiwan
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== 2021 ==
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 +
* [[2021 IMO]] (in Russia / virtual)
 +
* [[2021 IMO Problems/Problem 1 | Problem 1 (N2)]] proposed by Australia
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* [[2021 IMO Problems/Problem 2 | Problem 2 (A4)]] proposed by Calvin Deng, Canada
 +
* [[2021 IMO Problems/Problem 3 | Problem 3 (G7)]] proposed by Mykhailo Shtandenko, Ukraine
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* [[2021 IMO Problems/Problem 4 | Problem 4 (G2)]] proposed by Dominik Burek and Tomasz Ciesla, Poland
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* [[2021 IMO Problems/Problem 5 | Problem 5 (C3)]] proposed by Spain
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* [[2021 IMO Problems/Problem 6 | Problem 6 (A6)]] proposed by Austria
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== 2022 ==
 +
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* [[2022 IMO]] (in Norway)
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* [[2022 IMO Problems/Problem 1 | Problem 1 (C2)]] proposed by France
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* [[2022 IMO Problems/Problem 2 | Problem 2 (A3)]] proposed by Netherlands
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* [[2022 IMO Problems/Problem 3 | Problem 3 (N7)]] proposed by USA
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* [[2022 IMO Problems/Problem 4 | Problem 4 (G1)]] proposed by Slovakia
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* [[2022 IMO Problems/Problem 5 | Problem 5 (N4)]] proposed by Belgium
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* [[2022 IMO Problems/Problem 6 | Problem 6 (C8)]] proposed by Serbia
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== 2023 ==
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* [[2023 IMO]] (in Japan)
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* [[2023 IMO Problems/Problem 1 | Problem 1 (N1)]] proposed by Santiago Rodriguez, Colombia
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* [[2023 IMO Problems/Problem 2 | Problem 2 (G4)]] proposed by Tiago Mourão and Nuno Arala, Portugal
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* [[2023 IMO Problems/Problem 3 | Problem 3 (A6)]] proposed by Ivan Chan, Malaysia
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* [[2023 IMO Problems/Problem 4 | Problem 4 (A3)]] proposed by Merlijn Staps, Netherlands
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* [[2023 IMO Problems/Problem 5 | Problem 5 (C3)]] proposed by Merlijn Staps and Daniël Kroes, Netherlands
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* [[2023 IMO Problems/Problem 6 | Problem 6 (G8)]] proposed by Ankan Bhattacharya and Luke Robitaille, USA
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== 2024 ==
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* [[2024 IMO]] (in UK)
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* [[2024 IMO Problems/Problem 1 | Problem 1]]
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* [[2024 IMO Problems/Problem 2 | Problem 2]]
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* [[2024 IMO Problems/Problem 3 | Problem 3]]
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* [[2024 IMO Problems/Problem 4 | Problem 4]]
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* [[2024 IMO Problems/Problem 5 | Problem 5]]
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* [[2024 IMO Problems/Problem 6 | Problem 6]]
  
 
== Comment ==
 
== Comment ==
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For many problems, the composers do not have the nationality of the proposing country.  
 
For many problems, the composers do not have the nationality of the proposing country.  
For instance, problem 2009/4 was proposed by Belgium, but only two of the three problem authors were Belgian, whereas the third is from South-Korea.
+
For instance, problem 2009/4 was proposed by Belgium, but only two of the three problem authors were Belgian, whereas the third is from South-Korea. Similarly, problem 2020/3 was proposed by Hungary with one Hungarian and one non-Hungarian problem author.
  
To the current moment, there is only a single IMO problem that has two distinct proposing countries: The if-part of problem 1994/2 was proposed by Australia and its only-if part by Armenia.  
+
To the current moment, there is only a single IMO problem that has two distinct proposing countries: The if-part of problem 1994/2 was proposed by Australia and its only-if part by Armenia.
  
 
== See also ==
 
== See also ==

Latest revision as of 20:48, 8 December 2024

This page lists the authors and the proposing countries of the problems of the IMO.

1959

1960

1961

1962

1963

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

1976

1977

1978

1979

  • 1979 IMO (in the United Kingdom)
  • Problem 1 proposed by Arthur Engel, West Germany
  • Problem 2 proposed by Nickolay Khadzhiivanov and Nedjalko Nenov, Bulgaria
  • Problem 3 proposed by Nikolai Vasil'ev and Igor F. Sharygin, USSR
  • Problem 4 proposed by Murray Klamkin, USA
  • Problem 5 proposed by Joe Gillis, Israel
  • Problem 6 proposed by Arthur Engel, West Germany

1980

There was no IMO in 1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

  • 1994 IMO (in Hong Kong)
  • Problem 1 proposed by Vincent Lafforgue, France
  • Problem 2 proposed by Hans Lausch, Australia and Garnik Tonoyan, Armenia (independently)
  • Problem 3 proposed by Gabriel Istrate, Romania
  • Problem 4 proposed by Hans Lausch, Australia
  • Problem 5 proposed by David Monk, United Kingdom
  • Problem 6 proposed by Kerkko Luosto, Finland

1995

1996

1997

  • 1997 IMO (in Argentina)
  • Problem 1 proposed by Igor Akylich and Igor Voronovich, Belarus
  • Problem 2 proposed by David Monk, United Kingdom
  • Problem 3 proposed by Oleg Bogopolsky, Russia
  • Problem 4 proposed by Ebadollah S. Mahmoodian and Mohammad Mahdian, Iran
  • Problem 5 proposed by Petr Kanovsky, Czech Republic
  • Problem 6 proposed by Giedrius Alkauskas, Lithuania

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

2015

2016

2017

2018

2019

2020

2021

2022

2023

2024

Comment

This page lists the authors and the proposing countries of the problems of the IMO.

For many problems, the composers do not have the nationality of the proposing country. For instance, problem 2009/4 was proposed by Belgium, but only two of the three problem authors were Belgian, whereas the third is from South-Korea. Similarly, problem 2020/3 was proposed by Hungary with one Hungarian and one non-Hungarian problem author.

To the current moment, there is only a single IMO problem that has two distinct proposing countries: The if-part of problem 1994/2 was proposed by Australia and its only-if part by Armenia.

See also