Hello, Codeforces!

We are pleased to invite you to Pinely Round 4 (Div. 1 + Div. 2), which will start on Jul/28/2024 17:35 (Moscow time). The round will be rated for everyone.

You will be given 9 problems and 3 hours to solve them. There is at least one interactive problem, so please read the guide for interactive problems if you are unfamiliar with it.

The problems were authored and prepared by me.

We would like to thank:

• errorgorn for the excellent coordination.
• dXqwq, StarSilk, jiangbowen_, Endagorion, JCY_, jiangbowen, QwertyPi, chen_zexing, YocyCraft, zeliboba, HackerMonk, axs7384, Vladithur, davi_bart, prvocislo, leinad2, Andyvanh1, stasio6, hychyc, bitset, bonopo, Mucosolvan, RandomLB, CSQ31, Myrcella, NamelessOIer, guapisolo, Enigmurl, satyam343, Vingying0, qinyuzhou, 7oSkaaa, Geisel.Library, EpicChadGamer, AXXWTGST, and pengrui for testing the round and providing valuable feedback.
• Alexdat2000 for translating the statements to Russian.
• MikeMirzayanov for the great Codeforces and Polygon platform.

We hope you will enjoy the round!

Score distribution: $$$250 - 500 - 1000 - 1500 - 2000 - 2500 - 3000 - 3500 - 4000$$$

The editorial is here.

Congratulations to the winners!

1. tourist
2. jqdai0815
3. Radewoosh
4. ksun48
5. Rewinding
6. hos.lyric
7. jiangly
8. Benq
9. BurnedChicken
10. Szoboszlai10

This round is made possible with the support of Pinely!

Pinely is a dynamic algorithmic trading firm with a presence in Singapore, the Netherlands, and Cyprus. We specialize in high-frequency and ultra-low latency trading. Our team of mathematicians, programmers, engineers, and computer scientists tackles everyday challenges like developing trading strategies, optimizing systems for minimal latency, saving and processing large volumes of historical data.

Working at Pinely demands exceptional C++ coding, algorithmic thinking, and mathematical intuition, attracting top talent, including winners and awardees of such competitions as ICPC, IMC, HITB PRO CTF, Google HashCode, etc.

Learn more about us on our website or find our employees on CF. To join our team, please send your CV to [email protected], even if you are not participating in the contest.

Prizes: The top 30 contestants will receive a branded plush pine tree!

Ciao, Codeforces! We're glad to invite you to take part in Pinely Round 3 (Div. 1 + Div. 2), which will start on Dec/23/2023 17:35 (Moscow time). You will be given 9 problems and 3 hours to solve them. One of the problems will be divided into two subtasks.

The problems were authored and prepared by me.

We would like to thank

• errorgorn for his fun 🤌 🤡 🤓 😩 coordination;
• Alexdat2000 for Russian translation;
• franv for writing $$$173$$$ lines of checker of problem H correctly at the first try;
• franv for pictures in the editorial;
• dario2994, Endagorion, ffao, Golovanov399, nor for VIP testing;
• Kaey, MrBrionix, lorenzoferrari, nicksms, fwitt, milind0110, jamesbamber, alls, dorijanlendvaj, sunsh1ne, BrehamPie, 31ballons, gamegame, AndreySergunin, zeliboba, Jarnsida, I_L0Ve_MySelF, 1L1YA, MrAndria, TheRubbish, omsincoconut, jerefigo, dazlersan1, t0rtik, nondeterministic, SetBackIsBest, vantaablackk, htetgm, BestCrazyNoob, LaMatematica14, OgradL, bitset, magnus.hegdahl, Mirali777, Nika533, silxi, ttamx, ApraCadabra, pera2008, Sokol080808, A_G for testing;
• MikeMirzayanov for creating Codeforces and Polygon.

Score distribution: $$$500 - 1000 - 1500 - 2000 - 2500 - (1500 + 1500) - 4000 - 6000 - 6000$$$

We hope you'll like the problemset!

Update 1: the editorial is here.

Update 2: congratulations to the winners!

This round is made possible with the support of Pinely!

Pinely is an algorithmic trading firm, with its main focus set on high-frequency and ultra-low-latency trading. They have offices in Amsterdam, Limassol, Singapore, and Shanghai and are open for job discussions. Pinely is a team of winners, awardees, and medalists of various competitions in respective fields such as ICPC, IMC, HITB PRO CTF, and Google HashCode, etc. They constantly face various challenges such as developing strategies for trading, optimizing trading systems to achieve the lowest latency reactions to various market events, and saving and processing large volumes of historical data.

You can find out more about Pinely on their website or from their employees registered here on Codeforces. If you want to join the Pinely team, please send your CV to [email protected] or fill in the form:

Prizes: top 30 contestants and 10 random contestants placed 31-100 will receive a branded Pinely hoodie :)

Hey, Codeforces!

Pinely is here! Just like every year, we are sponsoring the PTZ competitive programming camp. As a part of this, we have prepared a contest for the participants and invite everyone to join it on Codeforces.

Pinely Round 2 (Div. 1 + Div. 2) is scheduled to start on Aug/30/2023 17:35 (Moscow time).

During this round, you will have the opportunity to solve 9 problems within a time frame of 3 hours. The round will be rated for everyone.

The problems have been authored and prepared by the Pinely team: AndreySergunin, ch_egor, Endagorion, amethyst0, zeliboba, zemen along with our special friend Golovanov399.

We would like to express our special thanks to:

• adventofcode, mtw, PurpleCrayon, Silver_Fox, maomao90, qrewetka, Vladithur, nigus, jdurie, alwyn, dorijanlendvaj, OAleksa, ognjentesic, Kostroma, oursaco, tiger2005, SSerxhs, absi2011, EternalAlexander, Lavine, wh0816, Kieray, socpite for testing,

• irkstepanov and KAN for coordination

• MikeMirzayanov for the amazing Codeforces and Polygon platforms.

We sincerely hope that you enjoy our contest. Wishing you good luck and lots of fun!

P.S. If you are interested in working at Pinely, please visit our website: https://pinely.com/, send us an email at [email protected] or fill in the form here

Congratulations to the winners!

1. tourist
2. Radewoosh
3. QAQAutoMaton
4. jiangly
5. Ormlis

Editorial.

Hello, Codeforces!

Members of team EZEC are glad to invite you to participate in Pinely Round 1 (Div. 1 + Div. 2), which will start on Nov/20/2022 17:35 (Moscow time). You will be given 7 problems, one of which has a subtask, and 2 hours and 30 minutes to solve them. The round will be rated for everyone. It is greatly recommended to read all the problems.

There is at least one interactive problem, so please see the guide of interactive problems if you are unfamiliar with it.

We would also like to thank:

• Our red sun orzdevinwang, the youngest TOP10 coder in history, for illuminating our path.
• Our great emperor antontrygubO_o for cooperating and coordinating with us to make this round happen. He saved the round by contributing his problem when a problem was found similar to an existing problem.
• Our authors for providing great ideas (both rejected and accepted): orzdevinwang, dXqwq , Forever_Pursuit, SpaceJellyfish, unputdownable, RedreamMer, pigstd. Without them, the round couldn't have been prepared so quickly.
• Our testers for high-quality testing and valuable advices: Ecrade_, cmll02, Redcrown, mtw, jqdai0815, pocafup, ieeqwq, Mooos, Justcyl, do_while_true, Ari, ffao, InternetPerson10, feecIe6418, __ZMF__, dingdingsb, PubabaOnO, lqx2005, myee, louhao088088, LinkZelda, Inversentropir-36, KagamineRin, zaozao_zmx1, Promisenxt, Tom66, RedLycoris, DearMargaret, Lynkcat, zeliboba, Kostroma, iwalainz, zemen, MELNIKOFF_OLEG, AndreySergunin, _overrated_, nick.sh, oleg_smirnov2001, kokokostya, lxyb, halin.george, Endagorion, I_love_myself, SSerxhs, LMOliver, George1123, Um_nik, 244mhq, apeiya.
• MikeMirzayanov for the great systems Codeforces and Polygon.

Fun facts:

• Anton reviewed 18 problems in total.
• This is the 13th round of EZEC. Here are some previous rounds: Round 11 on Luogu, Round 12 on nowcoder.
• The team has an anime character EZEC-chan (the girl in the image), hope you like it :3
• orzdevinwang found a better solution of F the day before the contest.

This round is made possible with the support of Pinely!

Pinely is a privately owned & funded algorithmic trading firm, our main focus is set on high frequency and ultra low latency trading.

We are a team of mathematicians, programmers, engineers and computer scientists driven by the immense passion for knowledge. We constantly face various challenges such as developing strategies for trading, optimizing trading systems to achieve the lowest latency reactions to various market events, saving and processing large volumes of historical data. The work we do requires a high ability to create effective C++ code, algorithmic thinking and mathematical intuition, which attracts winners, awardees and medalists of various competitions in the respective fields such as ICPC, IMC, HITB PRO CTF and Google HashCode etc.

Find out more about us on our website pinely.com or from our employees registered here on CF.

If you want to join our team please send your CV to [email protected] or fill in the form

Top 30 contestants and 10 random contestants placed 31-100 will receive a branded Pinely hoodie :)

The statements were made as briefly and clearly as we could. GLHF!

Scoring distribution: 500 — 1000 — 1250 — 1750 — 1750 — (2500+2000) — 3500

UPD1: Editorial is out. link.

UPD2: Congratulations to the winners:

• tourist
• dorijanlendvaj
• mnbvmar
• fivedemands
• Benq
• jiangly
• maroonrk
• inaFSTream
• hitonanode
• gisp_zjz

Pinely is a privately owned & funded algorithmic trading firm that is growing by leaps and bounds. We are based in Singapore, the Netherlands and Cyprus and our main focus is set on high frequency and ultra low latency trading.

We work in synergy to create a leading-edge & robust technology with the sole aim of exceling and establishing ourselves amongst the top trading companies around the globe. Our core team constantly faces various challenges such as developing strategies for trading, optimizing trading systems to achieve the lowest latency reactions to various market events, saving and processing large volumes of historical data.

We are a team of mathematicians, programmers, engineers and computer scientists, driven by an immense passion for knowledge. The work we do requires a high ability to create effective C++ code, algorithmic thinking and mathematical intuition, which attracts winners, awardees and medalists of various competitions in their respective fields such as ICPC, IMC, HITB PRO CTF and Google HashCode etc.

At Pinely we have a flat organizational structure with a collegial environment and an idea-driven culture to stay ahead of the curve.

Find out more about us on our website pinely.com or from our employees registered here on CF.

If you want to join our team please send your CV on [email protected]

This season we are happy to hold Pinely rounds on Codeforces. The first one will take place this sunday, on Nov/20/2022 17:35 (Moscow time). The round will be rated for all contestants.