FelixMP's blog

By FelixMP, history, 6 days ago, In English

I have added this year's Spain Olympiad in Informatics to the gym, both the two days of the finals and the online qualifier round.

Contest facts:

  • One 6-tasks contest and two 5-tasks contests with OI scoring (subtasks).
  • Statements in English and Spanish.
  • There are short editorials available only in Spanish, but it should be feasible to use a translation service.
  • Problems are ordered by difficulty in the online qualifier, but not in the finals.
  • Problem authors: FelixMP, misteg168, JanBobi, Rio.Parquer, MeGustaElArroz23 and ikaurov.
  • The problems cover a wide range of difficulties, and the subtasks make it possible to progress in all problems, so the finals should be interesting contests for participants of all skill levels. The online qualifier has a lower difficulty ceiling but some of the problems are still interesting I think.

I hope you like the problems!

Full text and comments »

  • Vote: I like it
  • +77
  • Vote: I do not like it

By FelixMP, history, 6 weeks ago, In English

Dear all,

We invite members of the programming contests community to submit tasks for the 2nd edition of the Western-European Olympiad in Informatics (WEOI), to be held in London, UK on 28th-30th June 2024. Tasks should be similar in style to the IOI, at the easy--medium end of difficulty---the tasks from the first edition may be found at https://weoi.org/weoi-2023/. Authors of selected tasks will be credited in the official solutions and on the WEOI website.

Please send submissions to [email protected] by 31st March 2024; we welcome submission of task ideas that may not be polished or in final form. Unused submissions will be returned to task authors and will remain confidential to the Scientific Committee.

Full text and comments »

  • Vote: I like it
  • +35
  • Vote: I do not like it

By FelixMP, history, 6 months ago, In English

I have added this year's Spain Olympiad in Informatics to the gym, both the two days of the finals and the online qualifier round. Previously on Codeforces I advertised the online mirror for the finals; now the problems are open here for everyone to try them.

Contest facts:

  • One 6-tasks contest and two 5-tasks contests with OI scoring (subtasks).
  • Statements in English and Spanish.
  • There are short editorial slides for the finals available only in Spanish, but it should be feasible to use a translation service.
  • Problems are ordered by difficulty in the online qualifier, but not in the finals.
  • Problem authors: FelixMP, misteg168, cescmentation_folch, BlancaHM, isaaclo97 and others.
  • The problems cover a wide range of difficulties, and the subtasks make it possible to progress in all problems, so the finals should be interesting contests for participants of all skill levels. The online qualifier has a lower difficulty ceiling but the problems are still interesting I think.

I hope you like the problems!

Full text and comments »

  • Vote: I like it
  • +84
  • Vote: I do not like it

By FelixMP, history, 12 months ago, In English

Hello!

I invite you to participate in the 27th Spain's Olympiad in Informatics' Online Mirror. This is the second year we are doing the mirror after last year's good reception. The two contests will start on 2023 March 25 14:30 UTC and 2023 March 26 8:00 UTC and will last 4 hours each.

Contest facts:

  • Two 5-tasks contests with OI scoring (subtasks).
  • Statements in English and Spanish.
  • Problems are not ordered by difficulty.
  • Problem selection and preparation directed by FelixMP. The full list of authors will be published after the contest.
  • The problems will cover a wide range of difficulties, and the subtasks make it possible to progress in all problems, so it should be an interesting contest for participants of all skill levels. For reference, see the problems from previous years on Codeforces Gym.
  • The allowed languages will be C++, Java and Python.
  • It is possible to participate on only one day, and the two different times make it convenient to participate in at least one of the days from almost anywhere in the world.

In order to participate in the contest, you must register using this form. The contest will be held in a CMS platform and you will receive your credentials and instructions for participating in the email you provided on the form. The deadline for registering is 23 March.

Good luck and enjoy the problems!

Full text and comments »

  • Vote: I like it
  • +32
  • Vote: I do not like it

By FelixMP, history, 21 month(s) ago, In English

I have added this year's Spain Olympiad in Informatics to the gym, both the two days of the finals and the online qualifier round. Previously on Codeforces I advertised the online mirror for the finals; now the problems are open here for everyone to try them.

Contest facts:

  • One 6-tasks contest and two 5-tasks contests with OI scoring (subtasks).
  • Statements in English and Spanish.
  • There are short editorials available only in Spanish, but it should be feasible to use a translation service.
  • Problems are ordered by difficulty in the online qualifier, but not in the finals.
  • Problem authors: FelixMP EdgarMM19 BlancaHM gog.gerard
  • The problems cover a wide range of difficulties, and the subtasks make it possible to progress in all problems, so the finals should be interesting contests for participants of all skill levels. The online qualifier has a lower difficulty ceiling but the problems are still interesting I think.

I hope you like the problems! We received very positive feedback on their quality from the online mirror, so I encourage you to try them.

Full text and comments »

  • Vote: I like it
  • +75
  • Vote: I do not like it

By FelixMP, history, 2 years ago, In English

1656A - Good Pairs

Author: FelixMP Preparator: FelixMP

Solution
Code

1656B - Subtract Operation

Author: FelixMP Preparator: xpov1LL

Solution
Code

1656C - Make Equal With Mod

Author: FelixMP Preparator: FelixMP

Solution
Code

1656D - K-good

Author: FelixMP Preparator: FelixMP

Solution
Code

1656E - Equal Tree Sums

Author: FelixMP Preparator: FelixMP

Solution
Code

1656F - Parametric MST

Author: FelixMP Preparator: FelixMP

Solution
Code

1656G - Cycle Palindrome

Author: FelixMP Preparator: FelixMP

Solution
Code

1656H - Equal LCM Subsets

Author: FelixMP Preparator: FelixMP

Solution
Code

1656I - Neighbour Ordering

Author: FelixMP Preparator: FelixMP

Solution
Code

Full text and comments »

  • Vote: I like it
  • +82
  • Vote: I do not like it

By FelixMP, history, 2 years ago, In English

Hello!

It is a pleasure to invite you to CodeTON Round 1 (Div. 1 + Div. 2, Rated, Prizes!)! The round will take place on 24.03.2022 17:35 (Московское время). The round will be rated for all participants. The problems of the round were authored by FelixMP, and they were prepared by FelixMP and xpov1LL.

I would like to thank the following people:

There will be 9 problems in the round, with score distribution $$$500 - 1000 - 1500 - 2000 - 2500 - 3000 - 3250 - 3750 - 4500$$$. Hope you have fun!

UPDATE: Editorial.

Here is information from our partners:

Hello, Codeforces!

We, the TON Foundation team, are pleased to support the CodeTON round and invite you to the TON Smart Challenge 1 competition, which will be held on our platform.

The Open Network (TON) is a fully decentralized blockchain created by the Telegram team for a mass audience.

The TON protocol was designed by Nikolai Durov — who is a two-time ICPC world champion, a three-time IMO gold medalist, a multiple IOI medalist, and a co-founder of Telegram — and other winners of international competitions. Now TON is being developed by a community of independent developers and teams.

The winners of CodeTON Round 1 will receive valuable prizes.

The first 1,000 participants will receive prizes in TON cryptocurrency:

  • 1st place: 1,000 TON
  • 2–3 places: 600 TON each
  • 4–10 places: 100 TON each
  • 11–100 places: 15 TON each
  • 101–1,000 places: 8 TON each

Also, the top 15 participants of CodeTON Round 1 will receive branded hoodies.

In addition, a separate TON Smart Challenge 1 contest will start on our platform on March 28. We invite you to join this competition as well.

You can read more about this competition here:

TON Smart Challenge 1 →

We believe that the problems of optimizing the efficiency of smart contract code execution on the TON blockchain may be of interest to participants in algorithmic competitions. The development of smart contracts is a case where the experience of optimization earns money by definition because a network fee is paid for each operation on the blockchain.

We wish you good luck at CodeTON Round 1 and hope to see you among the TON Smart Challenge participants!

UPD: If you have got into prizes or just want to join the TON, then register a wallet, follow one of these links: https://tonkeeper.com/ or https://wallet.ton.org/

Full text and comments »

  • Vote: I like it
  • +404
  • Vote: I do not like it

By FelixMP, history, 2 years ago, In English

Hello!

I invite you to participate in the 26th Spain's Olympiad in Informatics' Online Mirror. This is the first year we are doing the mirror contest and we hope it will be a success. The two contests will start on 2022 April 2 16:00 CEST and 2022 April 3 16:00 CEST and will last 4 hours each.

Contest facts:

  • Two 5-tasks contests with OI scoring (subtasks).
  • Statements in English and Spanish.
  • Problems are not ordered by difficulty.
  • Problem authors: FelixMP EdgarMM19 BlancaHM gog.gerard
  • The problems will cover a wide range of difficulties, and the subtasks make it possible to progress in all problems, so it should be an interesting contest for participants of all skill levels. For reference, see last year's problems here and here.
  • The allowed languages will be C++, Java and Python.

In order to participate in the contest, you must register using this form (use a translation service if you do not understand something). The contest will be held in a CMS platform and you will receive your credentials and instructions for participating in the email you provided on the form. The deadline for registering is 26 March.

Good luck and enjoy the problems!

Full text and comments »

  • Vote: I like it
  • +106
  • Vote: I do not like it

By FelixMP, history, 3 years ago, In English

I have added this year's Spain Olympiad in Informatics to the gym.

Contest facts:

  • Two 5-tasks contests with OI scoring (subtasks).
  • Statements in English and Spanish.
  • Problems are not ordered by difficulty.
  • Problem authors: FelixMP, Sadito10, BlancaHM.
  • Difficulty of fully solving problems should be like a Div2 round, perhaps a bit easier in general.
  • The easier problems may be a bit more based on implementation and common techniques (compared to a CF round). But the harder problems require observations and should be interesting to more advanced contestants too.

Enjoy!

Full text and comments »

  • Vote: I like it
  • +136
  • Vote: I do not like it