By graknlabs, 4 years ago, In English

My name is Vlad and I want to tell a story about how I ended up in the Grakn Labs. Before joining, I already worked for a couple of years in Kyiv and right after the graduation from Polytechnic Institute I moved to London to my current position, but it was a long path.

I was never sure if this whole experience is useful in any way for the real world, as a software engineer, up until joining Grakn Labs. ... a lot of attention during the recruitment process is paid to problem solving skills. We have algorithmic problems as part of our interview process and now we want to find our next engineer here on Сodeforces ...

— When did you start competitive coding?

When I was in the ~7-8 grade, my teacher showed us a website with problems and we got very competitive about it. After that, I was participating in math and informatics competitions up until the end of university

graknworker

— What did you learn/ how did participating in coding competitions impact your skills?

The main impact is boosting logic and STEM-related skills in general. For example, I was not preparing for math or physics competitions explicitly, I didn't 'train' for them in any way, but just from participating in coding competitions, as a bonus, I was taking places in math and physics.

— What's it like working at Grakn Labs as an engineer?

There is a huge difference compared to the rest of the places I worked. I've been a part of 3 different companies in Kyiv and none of them comes close to the level of the community's involvement and interest in Grakn. The majority of engineers I know have a 'job' job and the only goal is to get paid and go home, here we have different attitudes and priorities. We are a team driven by a purpose: to solve the world's most complex problems through, knowledge engineering.

- What type of problems are your working on?

Enterprise programming is significantly different from competitions, it is much more 'slow is smooth, smooth is fast' oriented, but I do have interesting challenges. The project I work on is a tool to test the performance of Grakn (a database). We have to generate data, insert it into the database, make a lot of different queries, measure their speed, correctness and visualize the results in a bunch of charts. It involves a lot of optimizations both on the server and client-side.

We're always looking for the best to round out our team, if you think this sounds like an interesting chance to work on an innovative technology; we'd love to hear from you.

FILL OUT FORM →

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By DimmyT, 4 years ago, translation, In English

As-salamu alaykum, Codeforces! (Peace, Codeforces!)

We are glad to invite you to Codeforces Round 673 (Div. 1) and Codeforces Round 673 (Div. 2), which will take place at Sep/27/2020 18:05 (Moscow time) (notice later time than usual). The round is rated for both divisions. Each division will be given 6 problems to solve in 2 hours.

Problems were prepared by nkamzabek, bthero and me DimmyT.

We are very grateful and would like to sincerely thank the following people for their assistance in preparing the round:

This is our first round, we hope that the problems will be interesting and that the round will pass without issues.

Score distribution:

Div2: 500-1000-1500-2000-2500-3000

Div1: 500-1000-1250-2000-2250-2750

Wish everyone good luck and high rating!!!

UPD: problem ideas

UPD: Editorial Out

Congratulations to everyone, contest passed without issues!!!

Div1:

  1. tourist

  2. ksun48

  3. maroonrk

  4. 300iq

  5. Aidos

Div2:

  1. poorboy

  2. kaisel

  3. immortalhunt

  4. hieu_2004

  5. _dg_

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By hiddentesla, 4 years ago, In English

Hello Codeforces Community. I would like to invite you all for ICPC Indonesia COMPFEST 12 Multi-Provincial Contest Online Mirror. I am the Person In Charge of the event.

compfestlogo

I want to thank:

The online mirror will be held on , 3 hours after the official contest starts. Teams are allowed. The duration of the contest is 5 hours. For the official contestants, please refrain from joining this mirror contest.

Our problems are relatively easier than ICPC regional contests. However, we promise an interesting and diverse problem set. I'd say the overall difficulty is slightly more challenging than div two rounds. There might be an interactive problem. So make sure to familiarize yourself

About COMPFEST: COMPFEST is an annual event hosted by the University of Indonesia. It is the largest student-run IT event in Indonesia, and Competitive Programming Contest (CPC COMPFEST) is one of the competitions hosted.

Our contest on regional finder

Note: this contest is unrated.

UPD1: Editorial and contest review will be posted in a few hours, after we finish the official contest duty.

UPD2: Editorial is available here

Congratulations to the winners!

  1. Extra Registration (LJC00118, xay5421, Sulfox)

  2. jiangly

  3. Bajetii (theodor.moroianu, freak93, bicsi)

  4. 未来ガジェット研究所 (wasa855, frame233, memset0c)

  5. QAQAutoMaton

  6. wlzhouzhuan

  7. 2016wudi fan club (ChthollyNotaSeniorious, leukocyte, Cirno_9baka)

  8. wucstdio

  9. Sugar_fan

  10. Teams Are For The Weak (IceKnight1093)

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By Wind_Eagle, 4 years ago, translation, In English

Hello, Codeforces!

I am very glad to invite you to the Codeforces Round #672 (Div. 2), which will take place in Sep/24/2020 17:35 (Moscow time). This round will be rated for the participants with rating lower than 2100.

All tasks were made by me, but gepardo helped me a lot with the last two tasks, probably these tasks wouldn't have appeared if he didn't help me.

My thanks to:

  • antontrygubO_o for coordinating this round. With this great coordination only good tasks remained in the contest.

  • gepardo made a lot, there wouldn't have been this contest if he didn't help me. He not only helped me with making last two tasks, but also helped me to understand how to make tasks for Codeforces rounds. Thanks!

  • EIK this is the person who teached me competitive programming — my Informatics teacher. Thanks!

  • programmer228, Hacktafly, K1ppy inspired me to make this round, listened for the every task idea, provided feedback and testing. Thanks!

  • Osama_Alkhodairy, vamaddur, thenymphsofdelphi, Devil, Ari, SleepyShashwat, TechNite, Monogon, Tech.Maniac, Kavit_Kheni for testing the round and the tasks. Thanks!

  • MikeMirzayanov for Codeforces and Polygon platforms. Thanks!

  • You for participating in this round. Thanks!

You will have 2 hours for solving 5 tasks, one of which will be divided into easy and hard verions. I hope you will enjoy the round, I tried to make short statements and strong pretests interesting tasks.

Score distribution: 500 — 1000 — (1000 + 1250) — 2000 — 3000

UPD: The editorial is available. English version will be ready after the system testing is over.

UPD2: The english version of the editorial is ready.

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By shishyando, history, 4 years ago, translation, In English

Hello, Codeforces!

Artyom123, Kotehok3 and I are happy to invite you to Codeforces Round 671 (Div. 2), which will be held on Sep/19/2020 17:35 (Moscow time). This round will be rated for all participants, whose rating is lower than 2100 (We really hope so).

We would like to thank:

You will be given 6 problems and 2 hours to solve them (or to play Valorant, because the contest is related to it for some reason). One problem has an easy version and a hard version.

You will have to help the agents from the game to grind that rating. Try your best as if you are playing ranked and they are your teammates!

gl hf

Here is the score distribution:

5007501250(750 + 1000)22503000

UPD: Editorial

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By awoo, history, 4 years ago, translation, In English

Hello Codeforces!

On Sep/14/2020 17:35 (Moscow time) Educational Codeforces Round 95 (Rated for Div. 2) will start.

Series of Educational Rounds continue being held as Harbour.Space University initiative! You can read the details about the cooperation between Harbour.Space University and Codeforces in the blog post.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Roman Roms Glazov, Adilbek adedalic Dalabaev, Vladimir vovuh Petrov, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 dzh_loves_mjy 7 204
2 neal 7 231
3 WZYYN 7 250
4 noimi 7 357
5 Um_nik 7 384

And finally people who were the first to solve each problem:

Problem Competitor Penalty
A Kirill22 0:01
B dzh_loves_mjy 0:04
C SSerxhs 0:05
D gleb.astashkin 0:17
E Pigbrain 0:19
F WZYYN 0:54
G OnlyG 0:16

UPD: Due to the issues with problems A and B the round is unrated.

UPD: Editorial is out

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By feecIe6418, history, 4 years ago, In English

Hello Codeforces!

gyh20 and I are glad to invite you to Codeforces Round 670 (Div. 2) which will start on Sep/12/2020 16:45 (Moscow time). Note the unusual start time of the round.

The contest will last for two hours, and you will have five tasks to solve. The tasks are prepared by me and gyh20. This round is rated for participants whose rating is not higher than 2099. You can see that my current rating is exactly 2099 :)

There might be an interactive problem. You can learn about them here.

We would like to thank:

We tried our best to make the statements short and clear, pretests strong and problems interesting. We hope you like the problems!

Score distribution will be announced shortly before the round.

Good luck and have fun!

Upd: Score distribution is 500-750-1250-1750-2500.

Upd: For problem reasons, the contest is delayed for 10 minutes. We are very sorry to keep you waiting, sorry again.

Upd: Score distribution is changed to 500-1000-1500-2000-2750.

Upd: The round is finished. We're really sorry for B being well-known (none of the testers knew the harder version of this problem in ABC173E). Still, congratulations to the winners!

Div1 (unofficial):

  1. WZYYN
  2. Geothermal
  3. kort0n
  4. neal
  5. kotatsugame

Div2:

  1. JSoap
  2. DemolitionLovers
  3. killyou
  4. gmh77
  5. SkyStar

Upd: Editorial is out here.

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By Aksenov239, 4 years ago, translation, In English

Hello Codeforces!

My name is Vitaly Aksenov and I present you the new lesson in English EDU section as a part of "ITMO Academy: pilot course". I will talk about Disjoint Sets Union (DSU).

A little bit about myself, I cannot brag about being red (International Grandmaster), however, I was twice and each time afterwards there was a revolution of colours on Codeforces. :-) Right now I am the Researcher in ITMO University in parallel and distributed computing (link). Also, I am in Jury Committee of several olympiads such as NERC, Bioinformatics Contest, Russian Code Cup and etc.

This is my first time to write a lecture so do not judge harshly. I hope you will like it!

I want to thank pashka for video editing, and thanks to pashka, MikeMirzayanov and niyaznigmatul for sharing the problems.

Go to EDU →

More about EDU section you can read in this post.

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By i.e, 4 years ago, translation, In English

blyat and I are glad to invite you to Codeforces Round 669 (Div. 2), which will take place on Sep/08/2020 17:35 (Moscow time). The round will be rated for all the participants with rating strictly less than 2100.

The problems were created and prepared by blyat and i.e. We would also like to thank everyone who was involved in the round preparation:

You will have 2 hours to solve 5 tasks. One of them is interactive, you should know how to deal with them.

Special thanks to my amazing minipig Schweine, who inspired us during the entire preparation time.

oink

Scoring will be announced shortly before the round.

UPD1: There will be no pictures of minipig in the statements. :)

UPD2: The scoring is 500-1000-1500-2000-2500.

UPD3: EdItOrIaL.

UPD4: Congrats to winners!

Div1 + Div2:

  1. ksun48

  2. WZYYN

  3. tribute_to_Ukraine_2022

  4. neal

  5. jiangly

Div2:

  1. Hoxilo

  2. deep_fake

  3. GiannisAttemptafreethrow

  4. watemus

  5. wasureta

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