The second round of the IIOT (International Informatics Olympiads in Teams) is starting on Tuesday December 10th 2024! The open contest will be 3 hours USACO-style, starting from 17:00 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/ for the standard division or https://mirror-esordienti.squadre.olinfo.it/ for the debutant division.
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ or https://mirror-esordienti.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The first round of the IIOT (International Informatics Olympiads in Teams) is starting on Monday November 11th 2024! The open contest will be 3 hours USACO-style, starting from 17:00 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/ for the standard division or https://mirror-esordienti.squadre.olinfo.it/ for the debutant division.
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ or https://mirror-esordienti.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

For the seventh time, the International Informatics Olympiads in Teams will be mirrored into online contests. These contests, of a lower difficulty level than those of the IOI, are intended for teams of 4 contestants from the same high school. However, everyone is welcome to participate to the mirror contests, especially if you are considering to join officially the IIOT in the future!

NEWS: Starting from this edition, there will also be a second division of IIOT: The debutant division! The contests of the debutant division will feature easier problems and are recommended for the more inexperienced teams.

More specifically, we allow:

• several teams from the same school (also in the official contest)
• teams participating only in some contests (also in the official contest)
• smaller teams (also in the official contest) and larger teams
• teams of students from different schools and non-students
• changes in team members between contests

The mirror contests timing will be USACO-like: it will be open for 27 hours but you will be able to compete for up to 3 hours (you can decide when to "start" your time window, after the login). Participation will be available upon registration (re-registration needed for each contest). The problem statements will be available in English only, and the languages officially supported are C, C++, Pascal and Python 3. Every contest will consist of 9 problems (see https://squadre.olinfo.it and https://iio.team for further information).

Note: you can decide when to start your 3 hour time window, but remember that the contest will end 27 hours after the start of the official contest regardless of your time window!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it few days after the contests
8. Good luck and have fun!

The mirror contest for Debutant Division will be available at https://mirror-esordienti.squadre.olinfo.it/. Its ranking will be available at https://mirror-esordienti.squadre.olinfo.it/ranking/.

The schedule of the contests is the following (starting times in the CET time zone):

• Practice: Nov. 4 to Nov. 9
• Round 1: Nov. 11 @ 17:30
• Round 2: Dec. 10 @ 17:30
• Round 3: Jan. 15 @ 17:30
• Round 4: Feb. 6 @ 17:30
• Finals: Mar. 14

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The final round of the IIOT (International Informatics Olympiads in Teams) has started! The open contest will last 3 hours USACO-style.

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

The fourth round of the IIOT (International Informatics Olympiads in Teams) is starting on Thursday February 8th 2024! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next eight problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The third round of the IIOT (International Informatics Olympiads in Teams) is starting on Thursday January 18th 2024! ( note that the date has changed ). The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The second round of the IIOT (International Informatics Olympiads in Teams) is starting on Tuesday December 12th 2023! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

For the seventh time, the International Informatics Olympiads in Teams will be mirrored into online contests. These contests, of a lower difficulty level than those of the IOI, are intended for teams of 4 contestants from the same high school. However, everyone is welcome to participate to the mirror contests, especially if you are considering to join officially the IIOT in the future!

More specifically, we allow:

• several teams from the same school (also in the official contest)
• teams participating only in some contests (also in the official contest)
• smaller teams (also in the official contest) and larger teams
• teams of students from different schools and non-students
• changes in team members between contests

The mirror contests timing will be USACO-like: it will be open for 27 hours but you will be able to compete for up to 3 hours (you can decide when to "start" your time window, after the login). Participation will be available upon registration (re-registration needed for each contest). The problem statements will be available in English only, and the languages officially supported are C, C++, Java, Pascal and Python 3. Every contest will consist of 9 problems (see https://squadre.olinfo.it and https://iio.team for further information).

Note: you can decide when to start your 3 hour time window, but remember that the contest will end 27 hours after the start of the official contest regardless of your time window!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it few days after the contests
8. Good luck and have fun!

The schedule of the contests is the following (starting times in the CET time zone):

• Practice: nov. 6 to nov. 11
• Round 1: nov. 13 @ 17:30
• Round 2: dec. 12 @ 17:30
• Round 3: jan. 17 @ 17:30
• Round 4: feb. 8 @ 17:30
• Finals: mar. 8

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

For the seventh time, the International Informatics Olympiads in Teams will be mirrored into online contests. These contests, of a lower difficulty level than those of the IOI, are intended for teams of 4 contestants from the same high school. However, everyone is welcome to participate to the mirror contests, especially if you are considering to join officially the IIOT in the future!

More specifically, we allow:

• several teams from the same school (also in the official contest)
• teams participating only in some contests (also in the official contest)
• smaller teams (also in the official contest) and larger teams
• teams of students from different schools and non-students
• changes in team members between contests

The mirror contests timing will be USACO-like: it will be open for 27 hours but you will be able to compete for up to 3 hours (you can decide when to "start" your time window, after the login). Participation will be available upon registration (re-registration needed for each contest). The problem statements will be available in English only, and the languages officially supported are C, C++, Pascal and Python 3. Every contest will consist of 9 problems (see https://squadre.olinfo.it and https://iio.team for further information).

Note: you can decide when to start your 3 hour time window, but remember that the contest will end 27 hours after the start of the official contest regardless of your time window!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it few days after the contests
8. Good luck and have fun!

The schedule of the contests is the following (starting times in the CET time zone):

• Practice: nov. 6 to nov. 11
• Round 1: nov. 13 @ 17:30
• Round 2: dec. 12 @ 17:30
• Round 3: jan. 18 @ 17:30
• Round 4: feb. 8 @ 17:30
• Finals: mar. 8

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The final round of the IIOT (International Informatics Olympiads in Teams) took place last weekend. The mirror contest is starting in two days, on March 19th 2023! The open contest will be 3 hours USACO-style, starting from 14:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next eight problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The fourth round of the IIOT (International Informatics Olympiads in Teams) is starting on Thursday February 9th 2023 (today)! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that.

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The third round of the IIOT (International Informatics Olympiads in Teams) is starting on Wednesday January 11th 2023 (tomorrow)! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next ten problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The second round of the IIOT (International Informatics Olympiads in Teams) is starting on Tuesday December 13th 2022! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The first round of the IIOT (International Informatics Olympiads in Teams) is starting tomorrow, November 14th 2022! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next eight problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

For the sixth time, the International Informatics Olympiads in Teams will be mirrored into online contests. These contests, of a lower difficulty level than those of the IOI, are intended for teams of 4 contestants from the same high school. However, everyone is welcome to participate to the mirror contests, especially if you are considering to join officially the IIOT in the future!

More specifically, we allow:

• several teams from the same school (also in the official contest)
• teams participating only in some contests (also in the official contest)
• smaller teams (also in the official contest) and larger teams
• teams of students from different schools and non-students
• changes in team members between contests

The mirror contests timing will be USACO-like: it will be open for 27 hours but you will be able to compete for up to 3 hours (you can decide when to "start" your time window, after the login). Participation will be available upon registration (re-registration needed for each contest). The problem statements will be available in English only, and the languages officially supported are C, C++, Pascal and Python 3. Every contest will consist of 9 problems (see https://squadre.olinfo.it and https://iio.team for further information).

Note: you can decide when to start your 3 hour time window, but remember that the contest will end 27 hours after the start of the official contest regardless of your time window!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it few days after the contests
8. Good luck and have fun!

The schedule of the contests is the following (starting times in the CET time zone):

• Practice: nov. 7 to nov. 11
• Round 1: nov. 14 @ 17:30
• Round 2: dec. 13 @ 17:30
• Round 3: jan. 11 @ 17:30
• Round 4: feb. 9 @ 17:30
• Finals: mar. 10 @ 13:00

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The 5th edition of the IIOT (International Informatics Olympiads in Teams) is starting in three days, on May 19th 2022! The open contest will be 3 hours USACO-style, starting from 13:00 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the seven problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The final round of IIOT took place last weekend and we would like to thank all the teams who participated. The problems were harder than usual, the hardest being police7, which only had 2 teams get a full score on it. In the onsite contest, calculator, colorpoints, police7 and prankster were not solved completely by any team.

Now, on with the top 5 teams:

• In the fifth place, team "DB_Fanclub ><", from India, with 634 points.
• In the fourth place, team "aa bb", from Italy, with 700 points.
• In the third place, team "Alon Tanay", from Israel, with 735.83 points.
• In the second place, team "pave ment", from Singapore, with 744.1 points.

And finally "Bushido Staszic", from Poland, came first with a full score. Congratulations to all!

The full ranking is available here.

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The final round of the IIOT (International Informatics Olympiads in Teams) is starting in two days, on March 25th 2022! The open contest will be 3 hours USACO-style, starting from 13:00 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next eight problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

As the first four rounds of IIOT have now concluded, we are glad to announce the winners of the mirror competion which took place alongside the official contest. Over the four rounds 252 teams scored points and all the problems but 2 were completely solved by a team, these problems being "Plowing Fields" from Round 2 and "Sorting Proximity" from round 3. Before congratulating the final winners, a special mention is due to "the quick errorgorn had not jumped over the lazy oolimry", "Israel winning IOI" and "Mister Wakaka" for solving all the problems in the first round.

Now, on with the top 5 teams:

• In the fifth place, team "Germany A", from Germany, with 2775 points.
• In the fourth place, team "Nescafe 4 f 1", from Egypt, with 2795 points.
• In the third place, team "Majorana2", from Italy, with 2993 points.
• In the second place, team "Magari", from Egypt, with 3070 points.

And finally "Alon Tanay", from Isreal, came first with 3158 points. Congratulations to all!

The full ranking is available here.

The competition does not end here though, as the final round will take place on Friday, March 25th. The online mirror round will start at 13:00 CET and end as usual 27 hours later, allowing for 3 hours of competition USACO-style.

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The fourth round of the IIOT (International Informatics Olympiads in Teams) is starting in two days, on February 3rd 2022! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The third round of the IIOT (International Informatics Olympiads in Teams) is starting tomorrow, January 12th 2022! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The second round of the IIOT (International Informatics Olympiads in Teams) is starting tomorrow, December 14th 2021! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next eight problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

The first round of the IIOT (International Informatics Olympiads in Teams) is starting tomorrow, November 15th 2021! The open contest will be 3 hours USACO-style, starting from 17:30 CET, and ending 27 hours after that. In the meanwhile, you can enjoy our teaser below and try to guess the next nine problems from the hints :)

This contest, of a lower difficulty level than the IOI, is intended for teams of 4 contestants from the same high school (check this post for further details). However, everyone is welcome to participate to the open contests!

If you want to participate, you must:

1. Visit the contest website: https://mirror.squadre.olinfo.it/
2. Click the link "register", fill out the form and then click on the register button and then "back to login"
3. You can now log in with the same username and password you used to sign up
4. If the login is successful you will be ready to participate, just wait for the contest to start! (and maybe save the page in your bookmarks, so that you can quickly get back to it when the contest begins)
5. When the contest starts, you will see a red button. Click it when you want to start your 3 hour time window!
6. The ranking for each contest will be available at https://mirror.squadre.olinfo.it/ranking/ after the start of each contest
7. The tasks will also be available for training in https://training.olinfo.it/#/tasks/ few days after the contests
8. Good luck and have fun!

We hope that you will join us or encourage your students to do so!

Tommaso Dossi (on behalf of the Italian IIOT organizers)

Ciao, Codeforces! We're glad to invite you to take part in Codeforces Round 701 (Div. 2), which will be held on Feb/12/2021 17:50 (Moscow time). This round will be rated for participants with rating lower than 2100.

You will be given 6 problems and 2 hours to solve them.

We would like to thank

• MrBrionix, MyK_00L, taulant and TheScrasse (a.k.a. the jungkook official fanclub) for inventing and preparing the problems.
• isaf27 for the great coordination and the valuable help he provided at any time.
• antontrygubO_o for not being involved and hence not rejecting any problem.
• MikeMirzayanov for creating Codeforces and Polygon.

Last but not least, we also want to thank the testers: armyalpaca, dario2994, davi_bart, DeadlyCritic, franfill, HIS_GRACE, kclee2172, lorenzoferrari, manik.jain, mattysal, namanbansal013, Osama_Alkhodairy, Prakash11, rocks03, Shusaku, simpatine, stefdasca and Retired_cherry.

The score distribution will be announced soon.

We hope you'll like the problemset!

UPD1: The score distribution is $$$500 - 1000 - 1500 - 1750 - 2500 - 3000$$$.

UPD2: For technical reasons, the round was postponed by 15 minutes. Sorry for that, good luck on round!

UPD3: Editorial is out.

UPD4: Congratulations to the winners!

Div. 1 + Div. 2:

1. Muffinhead
2. jiangly
3. neal
4. rustylake
5. SSRS_

Div. 2:

1. rustylake
2. Join_VNOI_Discord
3. Mr_Eight
4. _Froggy_
5. Brookli

First to solve each problem:

A: m_99
B: kmjp
C: Brookli
D: enoone
E: w0nsh
F: rainboy