Hello CodeForces Community,

I would like to co-ordially invite you all to take part in the CodeChef April Cook-Off. The problems were set by me and tested by shef_2318 (Pavel Sheftelevich). I hope you will enjoy solving them. Please give me your feedback on the problem set in the comments below after the contest. Please find the rest of the details about the contest below.

Time: 17th April 2016 (2130 hrs) to 18th April 2016 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/COOK69

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.

• Problem Setter: kostya_by (Kanstantsin Sokal)
• Problem Tester & Russian Translator: shef_2318 (Pavel Sheftelevich)
• Mandarin Translator: huzecong (Hu Zecong)
• Contest Admin & Editorialist: PraveenDhinwa (Praveen Dhinwa)
• Vietnamese Translator: VNOI Team

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!

UPD

The contest starts in 30 minutes!

Good luck everyone!

Hello CodeForces Community,

I have set the problems for the first January LunchTime of year 2016 and would like to invite you all for the same. The contest takes place at https://www.codechef.com/LTIME32. I am sure this will serve as a good practice for all those aiming for IOI 2016, we have adhered to the syllabus IOI and made the problems accordingly.

Time: 31st January 2016 (1100 hrs) to 31st January 2016 (1400 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone

Details: https://www.codechef.com/LTIME32

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.

• Problem Setter & Russian Translator: kostya_by (Kanstantsin Sokal)
• Editorialist: pkacprzak (Pawel Kacprzak)
• Problem Tester: shef_2318 (Pavel Sheftelevich)
• Contest Admin: PraveenDhinwa (Praveen Dhinwa) and pushkarmishra (Pushkar Mishra)
• Mandarin Translator: gediiiiiii (Gedi Zheng)
• Vietnamese Translator: VNOI Team
• Language Verifier: rarora7777 (Rahul Arora)

Prizes:

• Top 10 performers in Global and Indian category will win a cool CodeChef T-shirt. (For those who have not yet got their previous winning, please send an email to winners@codechef.com)

It promises to deliver on an interesting set of algorithmic problems with something for all. Please feel free to give your feedback on the problem set.

Good Luck! Hope to see you participating!

Hi everybody!

I invite you to participate in the CodeChef September Mega Cook-Off at https://www.codechef.com/COOK62. The problemset of the contest is prepared by me.

I hope you will like the problems: some of them require outstanding algorithmic thinking, some of them require brilliant coding skills — anyway, I'm pretty sure, that no one will get bored during the contest. ;)

Time: 20th September 2015 (21:30 hrs) to 21st September 2015 (00:00 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/COOK62

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.

The contest was prepared not only by me, but also by these amazing guys:

• Tester: Jingbo Shang(shangjingbo)
• Editorialist: Lalit Kundu(darkshadows)
• Contest Administrator: Praveen Dhinwa(PraveenDhinwa)
• Mandarin Translator: Gedi Zheng(gediiiiiii)
• Russian Translator: Vasia Antoniuk(Antoniuk)
• Vietnamese Translators: VNOI Team
• Language Verifier: Rahul Arora(rarora7777)

Prizes:

• Top 10 performers in Global and Indian category will win a cool CodeChef T-shirt. (For those who have not yet got their previous winning, please send an email to winners@codechef.com)

• Top 75 Indian performers will be provided with a reimbursement (for travel and registration) of upto INR 1500 for ACM ICPC 2015 regionals.

Good luck! See you on Sunday!

Note from contest admin:

Before we invite you to take part in this Cook-Off, let us take this opportunity on behalf of the engineering team at CodeChef, for the terrible experience that you had to go through at the last Cook-Off, which got unrated. And while we do this, we are completely aware of the fact that we have been making too many mistakes when it comes to Cook-Off and our apologies have also been on the rise. However, we have fixed a few things between then and now. And we are very hopeful that the same experience will not be repeated. Among many things that we have fixed, one major change will be the contest environment. We will be launching a much lighter version of the contest environment tonight. We hope you get a much better experience from now on. However, if there are any issues that you face in this environment, we request you to report them to us and we will fix them all.

UPD:

The contest starts in 30 minutes!

Hi everybody!

I'm inviting you to take part in the April Cook-off 2015 on CodeChef at http://www.codechef.com/COOK57. The problems are prepared by me this time.

Time: 19rd April 2015 (2130 hrs) to 20th April 2015 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: http://www.codechef.com/COOK57

Registration: Just need to have a CodeChef user id to participate.

New users please register here

I would also like to thank all guys that were taking part in preparations of this contest:

• Tester and Mandarin Translator: Gedi Zheng(gediiiiiii)
• Editorialist: Miguel Oliveira(mogers)
• Contest Administrator: Praveen Dhinwa(PraveenDhinwa)
• Russian Translator: Sergey Kulik(CherryTree)

Good luck!

Hi everybody!

I'm inviting you to take part in the November Cook-off 2014 on CodeChef at http://www.codechef.com/COOK52. The problems are prepared by me this time. Also, I'm the writer of the editorials.

Time: 23rd November 2014 (2130 hrs) to 24th November 2014 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: http://www.codechef.com/COOK52

Registration: Just need to have a CodeChef user id to participate.

New users please register here

I would also like to thank all guys that were taking part in preparations of the contest:

• Problem Tester: Roman Rubanenko(Rubanenko);
• Problem Administrator: Stephen Merrimen;
• Russian Translator: Sergey Kulik(CherryTree);
• Mandarin Translators: Gedi Zheng(gediiiiiii) and Minako Kojima(MinakoKojima).

I hope that you will enjoy solving the problems as much as I was enjoying while preparing them.

UPD

Contest starts in less than an hour!

CodeChef invites you to participate in the August Lunchtime 2014 at http://www.codechef.com/LTIME15. This is an IOI style contest. This means that the problems will be partially graded. You will get score for passing certain test data.

Time: 31st August 2014, 1100 hrs to 1400 hrs. (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: http://www.codechef.com/LTIME15/

Registration: Just need to have a CodeChef user id to participate. New users please register here

- Problem Setter: Constantin Sokol
- Problem Tester: Gedi Zheng
- Editorialist: Lalit Kundu
- Russian Translator: Sergey Kulik
- Mandarin Translator: Gedi Zheng & Minako Kojima

It promises to deliver on an interesting set of algorithmic problems with something for all.
The contest is open for all and those, who are interested, are requested to have a CodeChef User ID, in order to participate.

CodeChef invites you to participate in the June Cook-off 2014 at http://www.codechef.com/COOK47.

Time: 22nd June 2014 (2130 hrs) to 23rd June 2014 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: http://www.codechef.com/COOK47/

Registration: Just need to have a CodeChef user id to participate.

New users please register here

- Problem Setter : Constantin Sokol
- Problem Tester : Tasnim Imran Sunny
- Russian Translator : Sergey Kulik
- Editorialist: Praveen Dhinwa
- Mandarin Translator: Gedi Zheng & Minako Kojima

It promises to deliver on an interesting set of algorithmic problems with something for all. Also, it's a great opportunity to warm up before ACM-ICPC World Finals.
The contest is open for all and those, who are interested, are requested to have a CodeChef userid, in order to participate.

UPD!

Just to remind: The contest starts in less than 9 hours.