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RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the IOI 2016 - IOINFORMATICS.ORG The 28th International Olympiad in Informatics was held in Kazan, Russian Federation in 2016. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behindthe
IOI 2005 - IOINFORMATICS.ORG IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1: INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country ISRAEL - STATS.IOINFORMATICS.ORG Contact information. Website; Participation in IOI (based on database records) First participation: 1996; Years participated: 24; Contestants participated: 57NETHERLANDS
Contact information. Website; Participation in IOI (based on database records) First participation: 1990; Years participated: 31; Contestants participated: 84DUC BUI HONG
International Olympiad in Informatics – Statistics. Olympiads Countries Tasks Hall of Fame Search. Login Add Edit INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country. IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumRECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the IOI 2016 - IOINFORMATICS.ORG The 28th International Olympiad in Informatics was held in Kazan, Russian Federation in 2016. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behindthe
IOI 2005 - IOINFORMATICS.ORG IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1: INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country ISRAEL - STATS.IOINFORMATICS.ORG Contact information. Website; Participation in IOI (based on database records) First participation: 1996; Years participated: 24; Contestants participated: 57NETHERLANDS
Contact information. Website; Participation in IOI (based on database records) First participation: 1990; Years participated: 31; Contestants participated: 84DUC BUI HONG
International Olympiad in Informatics – Statistics. Olympiads Countries Tasks Hall of Fame Search. Login Add Edit INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country. JOI OPEN CONTEST 2021 Dear all, JOI Open Contest 2021 is an IOI-like open competition for students at schools for secondary education. The main purpose of this contest is to give Japanese delegations and candidates of delegations an opportunity for training and practice. But the contest itself isopen to everybody.
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
IOI 2006 - IOINFORMATICS.ORG The 18th International Olympiad in Informatics was held in Mérida, Yucatán, Mexico in 2006. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behindthe
SOLUTIONS TO PROBLEMS FROM IOI 2018 1 Combo In this problem there is a secret string S of length N which consists of four characters (namely A, B, X and Y). We also know thatthe rst character
INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country OLYMPIADS IN INFORMATICS OLYMPIADS 10 Olympiads in Informatics 10 IOI I t I l o p I d I n I t I s ISSN 1822-7732 Olympiads in Informatics Volume 10, 2016 Olympiads in Informatics Volume 10, 2016 OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard andANTON ALTANOV
International Olympiad in Informatics – Statistics. Olympiads Countries Tasks Hall of Fame Search. Login Add Edit INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumIOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumIOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. JOI OPEN CONTEST 2021 Dear all, JOI Open Contest 2021 is an IOI-like open competition for students at schools for secondary education. The main purpose of this contest is to give Japanese delegations and candidates of delegations an opportunity for training and practice. But the contest itself isopen to everybody.
GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
SYLLABUS - INTERNATIONAL OLYMPIAD IN INFORMATICS Syllabus. This is the official Syllabus version for IOI 2019 in Azerbaijan. The Syllabus is an official document related to the IOI. For each IOI, an up-to-date version of the Syllabus is produced by the ISC, as described in the IOI Regulations, Statue 3.13. The original proposal of the IOI Syllabus was co-authored by Tom Verhoeff, GyulaUPDATE ON IOI 2021
Update on IOI 2021. the IC held the Winter meeting in late February. We have the following important information regarding IOI 2021 to share with the community. First, IOI 2021, organized by Singapore, will still be an online competition much like the previous year. The competition week will fall between mid to late June. IOI 2009 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2009. The 21st International Olympiad in Informatics was held in Plovdiv, Bulgaria in 2009. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed atIOI'94 and beyond.
IOI 2005 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1: CONTESTS - INTERNATIONAL OLYMPIAD IN INFORMATICS Contests. The idea of initiating international olympiads in informatics for school students was proposed to the 24th General Conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO) in Paris by the Bulgarian delegate Professor Blagovest Sendov in October 1987. This plan was included into theFifth Main Program
OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country OLYMPIADS IN INFORMATICS OLYMPIADS 10 Olympiads in Informatics 10 IOI I t I l o p I d I n I t I s ISSN 1822-7732 Olympiads in Informatics Volume 10, 2016 Olympiads in Informatics Volume 10, 2016 INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumIOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumIOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. JOI OPEN CONTEST 2021 Dear all, JOI Open Contest 2021 is an IOI-like open competition for students at schools for secondary education. The main purpose of this contest is to give Japanese delegations and candidates of delegations an opportunity for training and practice. But the contest itself isopen to everybody.
GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
UPDATE ON IOI 2021
Update on IOI 2021. March 14th, 2021 in Competitions. Dear Friends of IOI, the IC held the Winter meeting in late February. We have the following important information regarding IOI 2021 to share with the community. First, IOI 2021, organized by Singapore, will still be an online competition much like the previous year. SYLLABUS - IOINFORMATICS.ORG Syllabus. This is the official Syllabus version for IOI 2019 in Azerbaijan. The Syllabus is an official document related to the IOI. For each IOI, an up-to-date version of the Syllabus is produced by the ISC, as described in the IOI Regulations, Statue 3.13. The original proposal of the IOI Syllabus was co-authored by Tom Verhoeff, Gyula IOI 2009 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2009. The 21st International Olympiad in Informatics was held in Plovdiv, Bulgaria in 2009. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed atIOI'94 and beyond.
IOI 2005 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1: OLYMPIADS IN INFORMATICS 6 B.A. Burton • teamevents, in which students work in groups to solve puzzles in cryptography and information security. These three events are described in Sections 2, 3 and 4 respectively. Section 5 dis-cusses practical requirements for running such events, including preparation and sup- OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN OLYMPIADS IN INFORMATICS ISSN 1822-7732 Editor-in-Chief ValentinaDagien˙e Instituteof Mathematics and Informatics,Lithuania,dagiene@ktl.mii.lt ExecutiveEditor OLYMPIADS IN INFORMATICS OLYMPIADS 10 Olympiads in Informatics 10 IOI I t I l o p I d I n I t I s ISSN 1822-7732 Olympiads in Informatics Volume 10, 2016 Olympiads in Informatics Volume 10, 2016 THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumIOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country.GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
IOI 2020 - STATS.IOINFORMATICS.ORG General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. MaximumIOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
RECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
IOI 2011 - IOINFORMATICS.ORG The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the COUNTRIES - STATS.IOINFORMATICS.ORG * According to S2.1 of IOI Regulations: "For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more pastIOIs".
INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. JOI OPEN CONTEST 2021 Dear all, JOI Open Contest 2021 is an IOI-like open competition for students at schools for secondary education. The main purpose of this contest is to give Japanese delegations and candidates of delegations an opportunity for training and practice. But the contest itself isopen to everybody.
GETTING STARTED
Getting Started. April 10th, 2021 in Contestants. Participation in IOI is not directly open to individuals. Each participating country sends a team of four students and selection is coordinated through a national competition. If your country is not listed on the Members page of the IOI, you need to approach an organization that is capableof
UPDATE ON IOI 2021
Update on IOI 2021. March 14th, 2021 in Competitions. Dear Friends of IOI, the IC held the Winter meeting in late February. We have the following important information regarding IOI 2021 to share with the community. First, IOI 2021, organized by Singapore, will still be an online competition much like the previous year. SYLLABUS - IOINFORMATICS.ORG Syllabus. This is the official Syllabus version for IOI 2019 in Azerbaijan. The Syllabus is an official document related to the IOI. For each IOI, an up-to-date version of the Syllabus is produced by the ISC, as described in the IOI Regulations, Statue 3.13. The original proposal of the IOI Syllabus was co-authored by Tom Verhoeff, Gyula IOI 2005 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1: IOI 2009 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2009. The 21st International Olympiad in Informatics was held in Plovdiv, Bulgaria in 2009. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed atIOI'94 and beyond.
OLYMPIADS IN INFORMATICS 6 B.A. Burton • teamevents, in which students work in groups to solve puzzles in cryptography and information security. These three events are described in Sections 2, 3 and 4 respectively. Section 5 dis-cusses practical requirements for running such events, including preparation and sup- OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN OLYMPIADS IN INFORMATICS ISSN 1822-7732 Editor-in-Chief ValentinaDagien˙e Instituteof Mathematics and Informatics,Lithuania,dagiene@ktl.mii.lt ExecutiveEditor OLYMPIADS IN INFORMATICS OLYMPIADS 10 Olympiads in Informatics 10 IOI I t I l o p I d I n I t I s ISSN 1822-7732 Olympiads in Informatics Volume 10, 2016 Olympiads in Informatics Volume 10, 2016 THE INTERNATIONAL OLYMPIAD IN INFORMATICS SYLLABUS The International Olympiad in Informatics Syllabus 1 Version and status information This is the Syllabus version intended for IOI 2019. There have been no changes since the 2018 version. INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country. IOI 2011 - INTERNATIONAL OLYMPIAD IN INFORMATICS The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONSOLYMPIAD INFORMATICS PAST QUESTIONSNATIONAL OLYMPIAD IN INFORMATICSINFORMATICS OLYMPIAD USAASIA PACIFIC INFORMATICS OLYMPIAD Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host CountryRECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
IOI 2020 - STATS.IOINFORMATICS.ORGIOI 2020 RANKINGIOI 2020 SCOREBOARDIOI OLYMPIADOLYMPIAD IN INFORMATICS General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. Maximum ISRAEL - STATS.IOINFORMATICS.ORG Contact information. Website; Participation in IOI (based on database records) First participation: 1996; Years participated: 24; Contestants participated: 57 IOI 2005 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1:NETHERLANDS
Contact information. Website; Participation in IOI (based on database records) First participation: 1990; Years participated: 31; Contestants participated: 84 IOI 2009 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2009. The 21st International Olympiad in Informatics was held in Plovdiv, Bulgaria in 2009. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed atIOI'94 and beyond.
IOI 2014 - INTERNATIONAL OLYMPIAD IN INFORMATICS General information. Host: Taipei, Taiwan Dates: 13 July 2014 – 20 July 2014; Contestants: 311; Countries: 81; Official website; Awards. Maximum possible score: 100 INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country. IOI 2011 - INTERNATIONAL OLYMPIAD IN INFORMATICS The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed at IOI'94 and beyond. Before IOI 1994, a human evaluator would sit behind the INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONSOLYMPIAD INFORMATICS PAST QUESTIONSNATIONAL OLYMPIAD IN INFORMATICSINFORMATICS OLYMPIAD USAASIA PACIFIC INFORMATICS OLYMPIAD Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host CountryRECOMMENDED READING
On this page, there is a list of a couple of books that might be of interest to contestants and problem authors. However, for beginners, we recommend you visit the "Getting Started" page. A nice and gentle introduction into the world of computers is (also see book review byPeter G. Neumann in
IOI 2020 - STATS.IOINFORMATICS.ORGIOI 2020 RANKINGIOI 2020 SCOREBOARDIOI OLYMPIADOLYMPIAD IN INFORMATICS General information. Host: online, Singapore Dates: 13 September 2020 – 19 September 2020; Contestants: 343; Countries: 87; Official website; Awards. Maximum ISRAEL - STATS.IOINFORMATICS.ORG Contact information. Website; Participation in IOI (based on database records) First participation: 1996; Years participated: 24; Contestants participated: 57 IOI 2005 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2005. June 15th, 2018 in Events. The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Day 1:NETHERLANDS
Contact information. Website; Participation in IOI (based on database records) First participation: 1990; Years participated: 31; Contestants participated: 84 IOI 2009 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2009. The 21st International Olympiad in Informatics was held in Plovdiv, Bulgaria in 2009. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed atIOI'94 and beyond.
IOI 2014 - INTERNATIONAL OLYMPIAD IN INFORMATICS General information. Host: Taipei, Taiwan Dates: 13 July 2014 – 20 July 2014; Contestants: 311; Countries: 81; Official website; Awards. Maximum possible score: 100 INTERNATIONAL OLYMPIAD IN INFORMATICS The IOI is the most prestigious computer science competition in the world for secondary school students. UNESCO and IFIP are patrons. The contest consists of two days of computer programming and solving various tasks of algorithmic nature. Students at the IOI compete on an individual basis, with up to four students competing from each participating country. INTERNATIONAL OLYMPIAD IN INFORMATICS REGULATIONS Participants 2.1 - 2.5 S2.1 For the IOI, a Country is a state that has an officially recognised relationship with the United Nations, UNESCO, or which has already taken part in one or more past IOIs. S2.2 The organisation of the IOI in year n is the responsibility of the Host Country for IOI’n.A Host Country OLYMPIADS IN INFORMATICS VOLUME 4 2010 OLYMPIADS IN Olympiads in Informatics Volume 4 2010 B.A. BURTON. Encouraging algorithmic thinking without a computer 3 V.M. KIRYUKHIN. Mutual influence of the national educational standard and OLYMPIADS IN INFORMATICS OLYMPIADS 10 Olympiads in Informatics 10 IOI I t I l o p I d I n I t I s ISSN 1822-7732 Olympiads in Informatics Volume 10, 2016 Olympiads in Informatics Volume 10, 2016IOI
This is an International Olympiad in Informatics Statistics website. This site is intended to give anyone an opportunity to easily contribute missing data. All changes will be checked before inclusion. Please, create a new person only if you're sure that they aren't already in the database. For recent years the information is takenfrom IOI
IOI 2009 - INTERNATIONAL OLYMPIAD IN INFORMATICS IOI 2009. The 21st International Olympiad in Informatics was held in Plovdiv, Bulgaria in 2009. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below. Note that the grading model changed atIOI'94 and beyond.
SOLUTIONS TO PROBLEMS FROM IOI 2018 1 Combo In this problem there is a secret string S of length N which consists of four characters (namely A, B, X and Y). We also know thatthe rst character
IOI 2014 - INTERNATIONAL OLYMPIAD IN INFORMATICS General information. Host: Taipei, Taiwan Dates: 13 July 2014 – 20 July 2014; Contestants: 311; Countries: 81; Official website; Awards. Maximum possible score: 100IOI 2020: TASKS
International Olympiad in Informatics – Statistics. Olympiads Countries Tasks Hall of Fame Search. Login Add IOI 2017 - INTERNATIONAL OLYMPIAD IN INFORMATICS General information. Host: Tehran, Iran. Offsite competition organized by IOI independently from Iran was held in Russia. Dates: 28 July 2017 – 04 August 2017. Contestants: 308 (4 offsite contestant (s) denoted by an asterisk) Countries: 83 (1 offsite country (ies) denoted by an asterisk) Official website. Home IOI 2019 official website* Home
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YouTube |IOI 2019, AZERBAIJAN The latest Olympiad took place in Azerbaijan, from August 4-11. You can visit the event website for more, or scroll down to read about the
IOI organization.
Website Results
NEWS
Call for projects
Dear all, IC is opening this years call for projects, for which up to 15000 euro are allocated. The deadline for the proposals is15.12.2019.
Italian Olympiad in Informatics For the fourth time, the Italian national contest (valid for the selection of the Italian IOI team) will be mirrored into an onlinecontest. The...
Call for tasks
Dear IOI Colleagues, on behalf of the IOI 2020 host, I would like to announce that the call for tasks for IOI 2020 is now open and we areinviting...
IOI Social Network
The International Olympiad in Informatics has published several official social network profiles for the IOI community.IOI 2019 is over
The IOI 2019 Azerbaijan brought together more than 300 talented young people who showcased their skills in the most prestigiouscomputer science...
EVENTS
Azerbaijan hosted IOI 2019 The International Olympiad in Informatics in 2019 was held from August 4 to August 11 in Azerbaijan. The previous Olympiad was held in Japan IOI 2018 took place in Japan in September of 2018. The official website has more information. International Olympiad in Informatics 2020 Singapore will host IOI 2020. Partial information about the event can be found online. Future event Egypt will host IOI 2021 You can read more about the future organizers of the IOI on the Editions page. Future eventNEED MORE INFO?
BEGINNERS
Not sure where to go? Click here to view some basic information on how to learn programming and prepare to win a medal at the IOI.STATISTICS
A couple of volunteers maintain a separate page with stats about people who participated at the International Olympiad in Informatics.JOURNAL
The IOI publishes a journal every year, with original high-quality scientific papers related to education, contests and algorithms.HISTORY OF THE IOI
Several International Olympiads in Informatics have been organized so far, hosted by a number of different countries.*
IOI 1989, Bulgaria
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IOI 1990, Soviet Union*
IOI 1991, Greece
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IOI 1992, Germany
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IOI 1993, Argentina
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IOI 1994, Sweden
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IOI 1995, Netherlands*
IOI 1996, Hungary
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IOI 1997, South Africa*
IOI 1998, Portugal
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IOI 1999, Turkey
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IOI 2000, China
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IOI 2001, Finland
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IOI 2002, Korea
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IOI 2003, USA
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IOI 2004, Greece
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IOI 2005, Poland
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IOI 2006, Mexico
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IOI 2007, Croatia
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IOI 2008, Egypt
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IOI 2009, Bulgaria
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IOI 2010, Canada
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IOI 2011, Thailand
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IOI 2012, Italy
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IOI 2013, Australia
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IOI 2014, Taiwan
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IOI 2015, Kazakhstan*
IOI 2016, Russia
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IOI 2017, Iran
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IOI 2018, Japan
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IOI 2019, Azerbaijan*
IOI 2020, Singapore*ORGANIZATION
The International Olympiad in Informatics is organized according to the IOI Regulations, and the decision made by the General Assembly. On this site, you can find all regulations, minutes, and people involved with the organization. OrganizationInfo MembersABOUT
The IOI is one of five international science olympiads. The primary goal of the IOI is to stimulate interest in informatics (computing science) and information technology. Another important goal is to bring together exceptionally talented pupils from various countries and to have them share scientific and cultural experiences.CONTESTANTS
* Guide
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