300iq's blog

By 300iq, history, 2 weeks ago, In English,

Author — gritukan

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By 300iq, 7 weeks ago, translation, In English,
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Thank you for your participation, see you soon (I hope)!

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By 300iq, 2 months ago, translation, In English,

Hi!

I'm glad to invite you to take part in Avito Code Challenge 2018 which starts on May/27/2018 17:50 (Moscow time). Any participant can join the round and it will be rated for each participant. Hope to see you among the participants!

Problems are prepared by me — Ildar Gainullin.

This round is conducted on the initiative and support of Avito. Avito.ru is a Russian classified advertisements website with sections devoted to general good for sale, jobs, real estate, personals, cars for sale, and services. Avito.ru is the most popular classifieds site in Russia and is the third biggest classifieds site in the world after Craigslist and the Chinese website 58.com.

Many thanks to Vladislav winger Isenbaev, Grigory gritukan Reznikov, Ivan isaf27 Safonov,Alexander AlexFetisov Fetisov and Shiqing cyand1317 Lyu for the round testing, Nikolay KAN Kalinin for helping me to prepare the contest, and also to Mike MikeMirzayanov Mirzayanov for systems Codeforces and Polygon.

Participants will be offered eight problems and three hours to solve them. Scoring will be announced a bit later.

Avito presents nice gifts for participants. Top 30 participants and also 10 random participants with places 31-130 will be awarded with a special T-shirt.

I hope everyone will find interesting problem for themselves. Wish everyone a successful round and high ratings!

Good luck!

UPD,Scoring: 500 750 1250 1750 2250 2750 3250 3750

UPD,Editorial is ready: Editorial!

The winners of random t-shirts are:

List place Contest Rank Name
6 981 36 snuke
31 981 61 Swistakk
40 981 70 yasugongshang
52 981 82 Xellos
62 981 92 shadowatyy
76 981 106 BudAlNik
80 981 110 kostka
88 981 118 pb0207
95 981 125 Noam527
96 981 126 xiaowuc1

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Announcement of Avito Code Challenge 2018
 
 
 
 
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By 300iq, history, 3 months ago, In English,

Hello CodeForces Community!

The month of April held a special significance in the programming world, with the ACM-ICPC World Finals crowning a new world champion. So how about you cap off this brilliant month with Chef’s next contest, the April Lunchtime 2018 and join your fellow programmers and enjoy the contest problems.

Joining me on the problem setting panel are:

  • Problem Setters, Editorialists and Russian Translators: 300iq (Ildar Gainullin), altruist (Denis Anischenko)
  • Problem Tester: kingofnumbers (Hasan Jaddouh)
  • Statement Verifier: Xellos (Jakub Safin)
  • Mandarin Translator: huzecong (Hu Zecong)
  • Vietnamese Translator: VNOI Team

I hope you will enjoy solving them. Please give your feedback on the problem set in the comments below, after the contest.

Contest Details:

Time: 28th April 2018 (1930 hrs) to 28th April 2018 (2230 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Contest link: https://www.codechef.com/LTIME59

Registration: You just need to have a CodeChef handle to participate. For all those, who are interested and do not have a CodeChef handle, are requested to register in order to participate.

Prizes: Top 10 performers in Global and Indian category will get CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here: https://www.codechef.com/laddu. (For those who have not yet got their previous winning, please send an email to winners@codechef.com)

Good Luck!
Hope to see you participating!!
Happy Programming!!

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By 300iq, history, 7 months ago, In English,
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By 300iq, history, 11 months ago, In Russian,

На контесте в ЛКШ зашел следующий алгоритм:

Шафлим полуплоскости, перебираем пару, находим точку пересечения, бежим по всем полуплоскостям, когда встречаем полуплоскость в которой эта точка не лежит -> break; Дальше строим выпуклую оболочку всех точек, которые лежат во всех полуплоскостях.

Полуплоскостей было <= 2000.

Слабые тесты или матожидание времени работы быстрее куба?

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By 300iq, history, 14 months ago, In English,

Hello CodeForces Community,

I take this opportunity to cordially invite you to take part in the CodeChef May Lunchtime. It is an IOI Style contest which will last for 3 hrs.

The problems were set by gainullin.ildar (Ildar Gainullin) and tested by adamant (Alexander Kulkov) & Xsquare (Prateek Gupta). The rest of the panel members include:

  • Russian Translator: CherryTree (Sergey Kulik)
  • Mandarin Translator: huzecong (Hu Zecong)
  • Vietnamese translators: VNOI team

We hope you will enjoy the problems and welcome your feedback in the comments below.

Time: Saturday, 27th May, 2017 at 19:30 HRS — 22:30 HRS. (Indian Standard Time +5:30 GMT) Check your timezone here.

Contest link: https://www.codechef.com/LTIME48

Accepted Languages: https://www.codechef.com/wiki/list-compilers

Registration: You just need to have a CodeChef handle to participate. For all those, who are interested and do not have a CodeChef handle, please register here in order to participate.

Prizes: Top 10 performers in Global and Indian school category will get CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here: https://www.codechef.com/laddu. (For those who have not yet got their previous winning, please send an email to winners@codechef.com)

Good Luck! Hope to see you participating!!

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By 300iq, history, 15 months ago, translation, In English,

Hi!

On April 23, 19:35 MSK will be held rated Tinkoff Challenge – Elimination Round.

Problems were prepared by me — Ildar Gainullin, Alexander alkurmtl Kurilkin and Nikolay KAN Kalinin.

Big thanks to Vladislav winger Isenbaev and Alexander AlexFetisov Fetisov for testing round, and also to Mike MikeMirzayanov Mirzayanov for systems Codeforces and Polygon.

Participants will be offered seven problems and two hours to solve them. Scoring will be announced a bit later.

This round is eliminational for Tinkoff Challenge.

Best 30 participants will be awarded with warm vests and other pleasant souvenirs like stickers and notepads. Best 100 participants will be invited to Moscow to visit Tinkoff's office with panoramic view on the city.

Best 20 participant who will be able to arrive will advance to Tinkoff Challange – Final Round.

We hope everyone will find interesting problem for themselves. We wish everyone a successful round and high ratings!

UPD. Scoring: 500 1000 1500 2000 2500 3000 3500

UPD. Editorial

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By 300iq, history, 19 months ago, In Russian,

Интересно, но на codeforces нельзя поискать слово string. Кто знает, почему так?

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By 300iq, history, 21 month(s) ago, In Russian,

Интересно, но на codeforces нельзя поискать слово chess. Кто знает, почему так?

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By 300iq, history, 22 months ago, In English,

Please, help me to solve this problem https://ru.kattis.com/problems/fenceortho, i know that i can use Rotating Calipers method, using 4 calipers, but i can't intersect them.

I write calipers method storing point and angle of caliper, please help me how to find intersection point of 2 calipers.

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By 300iq, history, 22 months ago, translation, In English,

Сan you please tell the basic principle of solving such problems with mincost. And please write problems that are solved by this method. for example BubbleCup, task G was one of these.

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By 300iq, history, 2 years ago, In Russian,

Здравствуйте, на сайте есть множество задач в которых применимо Convex Hull Trick, но где о нем можно прочитать на русском языке я так и не нашел. Знающие люди, подскажите пожалуйста, где можно прочитать о CHT на русском языке?

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