The 21-st edition of Week of Code https://www.hackerrank.com/w21 starts soon: 27 June 16:00 UTC.

Monday to Friday, every day one challenge will go live, easy to hard. The maximal score decreases by 10% at the end of every 24 hours. Your submissions will run on hidden test cases at the end of every 24 hours.

The time of each challenge will be counted since it's open. It allows you to start late.

The contest is prepared by shef_2318 and tested by CherryTree

The contest is rated and top 10 get T-shirts.

GL & HF

Hello CodeForces Community,

I would like to invite you all to take part in the CodeChef June Lunchtime. For those of you who don’t know, Lunchtime is an IOI style contest which incorporates partial marking. This means one gets points for passing certain test cases. The problems were set by me and tested by karanaggarwal (Karan Aggarwal). I hope you will enjoy solving them. Please give me your feedback on the problem set in the comments below after the contest. You shall find the rest of the details about the contest below.

Time: 25th June 2016 (1930 hrs) to 25th June 2016 (2230 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/LTIME37

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.

• Problem Setter & Russian Translator: shef_2318 Pavel Sheftelevich
• Problem Tester: karanaggarwal Karan Aggarwal
• Mandarin Translator: huzecong (Hu Zecong)
• Vietnamese Translator: VNOI Team
• Contest Admin & Language Verifier & Editorialist: PraveenDhinwa (Praveen Dhinwa)

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!!

Hi everyone!

I'd like to invite you to participate in June Clash on HackerEarth. Contest is scheduled on June, 11. Contest duration is 24 hours, so we hope it will be possible to find comfortable time for everyone in any timezone :) Check your time.

There will be six tasks in a problemset. Five of them are standard algorithmic problems with partial solutions allowed — you get points for every test that your solution passed. And the last task is an approximate problem — your score for this task depends on how good your solution is comparing to current best solution.

PrinceOfPersia has kindly prepared this problemset. Check out his previous Clash contests on HackerEarth and rounds on CodeForces to make sure that it's likely that you will enjoy the problems :)

I worked on this contest as a tester. In our opinion several tasks will be not too hard for beginners (at least one:) ) (show your best with partial scoring — even very naive solution may give you some points; and 24 hours should be enough for you to read all problems and find some tasks which you can solve).

We hope some tasks will be decent challenges for experienced contestants too. But if you think that classic part of problemset is easy — the approximate problem is waiting for you :)

Thanks to belowthebelt for handling all technical aspects of contest preparation.

The problem statements will be provided in English and Russian.

As usual, here is one more reason for you to participate in this contest:

Top5 of leaderboard will grab some nice prizes:

1. $100 Amazon gift card + HackerEarth T-shirt

2. $75 Amazon gift card + HackerEarth T-shirt

3. $50 Amazon gift card + HackerEarth T-shirt

4. HackerEarth T-shirt

5. HackerEarth T-shirt

Good luck to everybody and let's have fun :)

Hi everyone!

I'd like to invite you to participate in April Clash on HackerEarth. Contest is scheduled on April, 16. Contest duration is 24 hours, so we hope it will be possible to find comfortable time for everyone in any timezone :) Check your time.

There will be six tasks in a problemset. Five of them are standard algorithmic problems with partial solutions allowed — you get points for every test that your solution passed. And the last task is an approximate problem — your score for this task depends on how good your solution is comparing to current best solution.

kostya_by is author of this problemset. Check out his problems on Codechef and Hackereath to make sure that he is able to provide good problems :)

As you might guess I worked on this contest as a tester and that was nice:) In our opinion several tasks will be not too hard for beginners (don't give up and show your best with partial scoring — even very naive solution may give you some points; and 24 hours should be enough for you to read all problems and find some tasks which you can solve).

At the same time we are pretty sure that some tasks will be decent challenges for experienced contestants too. But if you think that classic part of problemset is easy — the approximate problem is waiting for you :)

Also we want to thank belowthebelt for handling all technical aspects of contest preparation.

The problem statements will be provided in English and Russian.

As usual, here is one more reason for you to participate in this contest:

Top5 of leaderboard will grab some nice prizes:

1. $100 Amazon gift card + HackerEarth T-shirt

2. $80 Amazon gift card + HackerEarth T-shirt

3. $50 Amazon gift card + HackerEarth T-shirt

4. HackerEarth T-shirt

5. HackerEarth T-shirt

Good luck to everybody — let's have fun :)

Hello CodeForces Community,

I would like to co-ordially invite you all to take part in the CodeChef February Cook-Off, contest. The problems were set by me and tested by kostya_by (Kanstantsin Sokal). I hope you will enjoy solving them. You may find the rest of the details about the contest below.

Time: 21st February 2016 (2130 hrs) to 22nd February 2016 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/COOK67

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: shef_2318 (Pavel Sheftelevich)
• Editorialist: ma5termind (Sunny Aggarwal)
• Problem Tester: kostya_by (Kanstantsin Sokal)
• Mandarin Translator: huzecong (Hu Zecong)
• Contest Admin: PraveenDhinwa (Praveen Dhinwa)
• 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)

Good Luck! Hope to see you participating!!

Thanks

Hi everyone!

I'm happy to announce you about the new contest organised by HackerEarth — India Hacks 2016!

Just check out the prizes:

There will be 3 qualification rounds with 3 hours duration each. From each qualifier top 1000 participants will advance to the main contest, so the final is going to be a decent battle of 3000 coders.

The first qualification round is taking place on Sunday, January 3, 18.30 Moscow time. View your time here

The problems of the first round were kindly prepared by RomaWhite. As you might already guessed I'm the tester and editorialist. In my opinion this problem set is very nice because it requires more thinking than implementation, but on the other hand most of the problems are not very hard, so it will be a good warm-up for your brain after New Year celebration :)

In order to participate register here.

Important note: this contest has a partial scoring system and all the problems have subtasks. It means that if you don't know how to solve some problem you should try your best to get some partial solution.

Bye-bye and I hope to see you all participating and having fun :)

Hello Codeforces!

November Easy is taking place on November the 1-st at 19:00 MSK. Contest duration is 3 hours.

The contest will consist of 6 problems. Each problem is worth 100 points. Most of them have partial scoring. Ties are resolved by penalty time.

I've decided to experiment a bit, so the format of the contest will slightly differ from the previous ones. There will be:

• 4 usual algorithm problems of various difficulty. In my opinion they might be interesting for complete beginners as well as for enough experienced participants.

• 2 problems that differ from usual ACM / IOI tasks.

I'd like to thank all the guys who worked on it with me: admins belowthebelt, MDCCXXIX, tester Kmcode and editorialist pkacprzak. Your suggestions and ideas were really useful. I hope I'll work with all of you again in the future :)

As this contest is called Easy it will not require complicated implementations or too hard ideas, but I'm quite sure that participants of almost all the levels will be able to find interesting problems.

Good luck and enjoy it!

And almost forgot about nice bonus: Top 5 beginners (1st year or 2nd year) will receive HackerEarth Tshirts.

UPD: contest starts in less than 2 hours

Hello CodeForces Community,

I’d like to invite you to CodeChef October LunchTime at https://www.codechef.com/LTIME29.

Time: 25th October 2015 (1100 hrs) to 25th October 2015 (1400 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone

Details: https://www.codechef.com/LTIME29

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 and Russian Translator: shef_2318 (Pavel Sheftelevich)
• Editorialist: pkacprzak (Pawel Kacprzak)
• Problem Tester: CherryTree (Sergey Kulik)
• Contest Admin: PraveenDhinwa (Praveen Dhinwa) and pushkarmishra (Pushkar Mishra)
• Mandarin Translator: huzecong (Hu Zecong)
• 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.

Good Luck! Hope to see you participating!!

Hi all!

I invite you to take part in the January Lunchtime 2015 on CodeChef. I'm the author and Russian Translator of this contest.

Time: 25st January 2015 11:00 am to 2:00 pm. (IST — +5:30 GMT) — Check your timezone.

Details

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

New users can register here.

Thanks to all who took part in preparations:

Problem Tester: Rubanenko

Problem Admin: PraveenDhinwa

Editorialist: pkacprzak

Mandarin Translator: gediiiiiii

It's the first contest prepared by me and I really hope you will like it :)