By Anadi, history, 6 months ago,

1836A - Destroyer

Tutorial
Solution

1836B - Astrophysicists

Tutorial
Solution
Tutorial
Solution
Tutorial
Solution
Tutorial
Solution
Tutorial
Solution

1835E - Old Mobile

Tutorial
Solution

1835F - Good Graph

Tutorial
Solution
• -267

With a special dedication to all the people from Ukraine.

Hi, Codeforces!

I have the pleasure of inviting you to participate in Codeforces Round 880 (Div. 1) and Codeforces Round 880 (Div. 2), which will start on Jun/18/2023 17:35 (Moscow time). You will be given 6 problems and 2 hours to solve them in both divisions.

The problems were authored and prepared by Arti1990, Okrut, w0nsh, kempusss, Fly_37, kobor, maras, and me. As the tasks are based on problems from Polish Championship in Team Programming for High School, which takes place earlier on the same day, participants from the original competition are asked not to participate in this round nor share the problems.

I want to thank:

The scoring distribution:

Div. 1: $500$ — $1250$ — $1500$ — $1750$ — $2250$ — $3000$

Div. 2: $750$ — $1000$ — $1250$ — $2000$ — $2250$ — $2750$

Editorial

Have fun and good luck!

• -1467

By Anadi, history, 3 years ago,

1466A - Bovine Dilemma

Tutorial
Solution 1
Solution 2
Challenge

1466B - Last minute enhancements

Tutorial
Solution 1
Solution 2
Challenge

1466C - Canine poetry

Tutorial
Solution 1
Solution 2
Challenge

1466D - 13th Labour of Heracles

Tutorial
Solution

1466E - Apollo versus Pan

Tutorial
Solution

1466F - Euclid's nightmare

Tutorial
Solution

1466G - Song of the Sirens

Tutorial
Solution

1466H - Finding satisfactory solutions

Tutorial
Solution

1466I - The Riddle of the Sphinx

Tutorial
Solution

I am really interested in solving this task using fewer queries or proving that $3 \cdot (n + b)$ is optimal. Does anyone have any idea how to answer these questions?

Tutorial of Good Bye 2020
• +316

By Anadi, history, 4 years ago,

Hello Codeforces!

We have a pleasure to invite you to Codeforces Round #647 (Div. 1) and Codeforces Round #647 (Div. 2). This round will take place on Jun/04/2020 17:35 (Moscow time). In both divisions, you will have 2.5 hours to solve 6 problems. Three of them will be shared.

The problems for this round were prepared by MicGor, Grzmot, Okrut and me.

We would like to thank everyone who made this round possible:

We hope you will enjoy the problem set! Good luck!

UPD: Score distribution:

• Div 1: $500$ $-$ $1250$ $-$ $2000$ $-$ $2500$ $-$ $3000$ $-$ $3500$
• Div 2: $500$ $-$ $1000$ $-$ $1500$ $-$ $2000$ $-$ $2750$ $-$ $3500$

UPD: Editorial

UPD: Congratulations to the winners!

Div. 1:

Div. 2

Below is a message for you from MikeMirzayanov:

With this round, we want to say thank you to Algo Muse for the significant contribution and support!

Algo Muse is an educational site that conducts online algorithmic contests in pen-and-paper style (no coding). It was originally started to help students prepare for theory qualifiers for graduate admissions. At present, the problems have a broader appeal, though occasionally an odd problem may require knowledge of linear algebra, probability, or group theory. The website is maintained by former students of IIT Bombay. To find out more, visit their website or their twitter account.

• +930

By Anadi, history, 4 years ago,

XX Open Cup Grand Prix of Wrocław takes place on Sunday, March 29, 2020 at 10:00 CEST.

Link to the contest (you need an Open Cup login to participate).

The round is based on local competitions organized in 2018 and 2019 in Wrocław. Tasks were invented, prepared and translated by gawry, bardek, Arti1990, Rafiki53, Skedar, koratel, Kreyyy, Łukasz Zatorski, Arblash, yarek, MicGor, Maciektoja, w0nsh, kobor, Fly_37 and me.

Good luck!

UPD: There was a wrong time written at the beginning! I got confused because of the time change in Poland and I am deeply sorry about that.

UPD: Editorial

• +168

By Anadi, history, 5 years ago,

Tutorial
Solution

Tutorial
Solution

Tutorial
Solution

Tutorial
Solution

Tutorial
Solution

Author: Rzepa

Tutorial
Solution 1
Solution 2

#### 1043G — Speckled Band

Tutorial
Solution 1
Solution 2

Author: isaf27

• +113

I would like to invite you to participate in the rated Codeforces Round 519 by Botan Investments. Date and time of the round: Oct/28/2018 18:35 (Moscow time).

This is a combined round having 7 problems and lasting 2 hours, and it will be rated.

Tasks for you were prepared by Anadi, Grzmot, isaf27 and Rzepa. Also thanks for:

KAN and cdkrot for help in preparing the problems; pavel.savchenkov, Nerevar, map, GR1n, rutsh, AlexFetisov and winger for testing the round; MikeMirzayanov for Codeforces and Polygon platforms.

The round is supported by Botan Investments.

Prizes! Top 50 participants and 20 random participants with rank from 51 to 500 will receive personalized hoodie with CF handle.

Scoring distribution will be announced later. I wish you a high rating and looking forward to see you at the competition!

UPD: I'll be on the community Discord server shortly after the contest to discuss the problems.

UPD: Scoring: 500 1000 1500 2000 2250 2750 3500

UPD: Editorial

The round is over, congratulations to the winners!

• +544