Hi Codeforces Community,

I would like to invite you to participate in Hackerrank-hourrank edition 29 where the faster coder wins. Contest will be held at 8:30 p.m IST today. Please check time here as per your timezone. You can register for the contest at here.

I am the author of this contest. You will be given 3 problems and 1 hour of solve. Problems will be of varying difficulty scoring 10-45-70 and each problem contains subtasks. Therefore, you must read all the problems. Don't worry as usual, I promise you to deliver an interesting set of problems with something for all.

I would like to thank shashank21j, kevinsogo for giving me this opportunity and bayleef for testing this round.

Please do participate, tag your friends and challenge them to participate.

PS: Editorials are up now.

Hi Codeforces,

I am taking this opportunity to announce HackerRank HourRank 17, a 60 minute contest where the fastest coder wins!. The contest will be held on 16:00 UTC Thursday, 2nd February, 2017. You can sign up for the contest here. Contestants will be given 4 problems and 1 hour to solve. I recommend all of you to read all the problems as each problem contains some interesting subtasks. Top 10 global winners will get cool HackerRank T-shirts. Note that contest will be rated for all users.

By this time you can probably guess, i am author of this contest and i promise you all to deliver an interesting problem set with something for all. I really want to thank danilka.pro for testing all the problems and helping me to come up with nice problem set. My special thanks to Shafaet for giving me another opportunity and motivate me to work hard for this contest. Also, thanks to svanidz1 for presolving the contest and providing his valuable feedback.

Scoring will be posted right before the contest and editorials will be published right after the contest.

Hope to see you participating.

Good Luck & Have Fun.

UPDATE 1: Score Distribution 15, 30, 60, 80.

UPDATE 2: Contest will be started in less than 15 minutes.

UPDATE 3: Drum roll please and top 10 winners are:

1. RomaWhite
2. xllend3
3. uwi
4. jonathanirvings
5. abcdef6199
6. [user:vm450]
7. satyaki3794
8. zscoder
9. rajat1603
10. [user:hoigamn_xing]

Please feel free to comment your codeforces handle. I will update the post. Any more comments and feedbacks are welcome.

Hi Codeforces,

I am taking this opportunity to announce HackerRank HourRank 15, a 60 minute contest where the fastest coder wins!. The contest will be held on 16:30 UTC Saturday, 3rd December, 2016. You can sign up for the contest here. Contestants will be given 4 problems and 1 hour to solve. I recommend all of you to read all the problems as each problem contains some interesting subtasks. Top 10 global winners will get cool HackerRank T-shirts. Note that contest will be rated for all users.

As you can probably guess, i am author of this contest and i promise you all to deliver an interesting problem set with something for all. I really want to thank danilka.pro for testing all the problems and helping me to come up with nice problem set. My special thanks to Shafaet for bringing me back to problem setting and motivate me to work hard for this contest. Also, thanks to svanidz1 for presolving the contest and providing his valuable feedback.

Scoring will be posted right before the contest and editorials will be published right after the contest.

Hope to see you participating.

Good Luck & Have Fun.

UPDATE 1: Score Distribution 15-35-70-80.

UPDATE 2: Contest will be started in less than 25 minutes. See you guys on leaderboard.

UPDATE 3: Contest will be started in less than 5 minutes. All the best.

UPDATE 4: Contest has started. May the force is with you :).

UPDATE 5: Contest has ended. Editorials are uploaded. Thank you for participating. I am eagerly waiting to have your feedback guys.

Hello CodeForces Community,

I have set the problems for the April LunchTime and would like to invite you all for the same. The contest takes place at https://www.codechef.com/LTIME35. 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: 30th April 2016 (1930 hrs) to 30th April 2016 (2230 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone

Details: https://www.codechef.com/LTIME35

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 & Editorialist: ma5termind (Sunny Aggarwal)

• Problem Tester & Russian Translator: CherryTree (Sergey Kulik)

• Contest Admin: PraveenDhinwa (Praveen Dhinwa) and pushkarmishra (Pushkar Mishra)

• Mandarin Translator: huzecong (Hu Zecong)

• Vietnamese Translator: VNOI Team

Prizes for April LunchTime 2016:

• Top 10 school students each from 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 [email protected]).

Rest, 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!!

UPDATE 1 Contest will be started in less than 40 minutes.

UPDATE 2 Contest will be started in less than 10 minutes. Good luck and have fun.

Hi Codeforces !

I am glad to announce seventh HackerRank HourRank round! The contest will be held on 18:00 UTC Friday, April 1 2016. Contestants will be given 4 problems and 1 hour to solve them. You can sign up for the contest here. Top 10 winners will receive a HackerRank T-Shirt. The contest is rated for all users.

HourRank 7 problem set is prepared by me (ma5termind) and is tested by svanidz1. I would like to thank Shafaet for helping us preparing this round.

I am sure that everyone will find this round interesting and challenging. Each problem will be starring my friend Nikita and you have to help her solving some simple but interesting tasks.

Hope to see you participating.

Good Luck & Have Fun

UPDATE 1: Score Distribution: 25 50 70 80. Contest will be stated in less than 2.0 hour.

UPDATE 2: Contest will be stated in less than 20 minutes.

UPDATE 3: Timer begins 60 minutes 4 problems. All The Best :) :)

UPDATE 4: Thank you for participating. Contest has ended. Editorials are published.

Top 10 on the leaderboard
Errichto
anta
mgch
sokian
Vercingetorix
I_love_Tanya_Romanova
rajat1603
savinov
djdolls
zemen

I hope you have enjoyed the contest. Please feel free to provide your feedback in comments.

Hello CodeForces Community,

I have set the problems for CodeChef January Cook-Off and would like to invite you all for the same, the contest will take place at https://www.codechef.com/COOK66. There are some really interesting set of problems, hope you enjoy solving them. Please give your feedback on the problem set in the comments after the contest. You may find the rest of the details about the contest below.

Time: 24th January 2016 (2130 hrs) to 25th January 2016 (0000 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/COOK66

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: ma5termind (Sunny Aggarwal)
• Editorialist: pushkarmishra (Pushkar Mishra)
• Problem Tester & Russian Translator: Antoniuk (Vasya Antoniuk)
• Mandarin Translator:: gediiiiiii (Gedi Zheng)
• 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 [email protected])

I promise all of you to deliver an interesting set of problems with something for all and you can witness this by participating.

Detail editorials will be available right after the contest.

Good Luck & Have Fun !!! Hope to see you participating!!

Hello Codeforces community!

I am glad to announce that HackerRank 101 Hack 29th edition will be held on 23rd September 2015 at 16:30 UTC. You can sign up for the contest here. Though what's priceless is solving interesting problems and the thrill of competition, prizes make the competition fierce. Top 10 performers will get a HackerRank T-shirt.

Problems have been set by ma5termind and tested by wanbo. The contest will consist of 5 problems with variable scoring distribution. We have tried our best to prepare a nice problem set. Xaero is the main character of the problem set. He is one of the awesome person I met in my whole life. So, your main task would be to help him in each problem. Although, Xaero is smart enough to solve all of these problems but he is quite busy these days.

Hopefully everyone will enjoy. Also, you'll be able to enjoy the detailed editorials written by the setter.

Good luck and have fun!

UPDATE

Editorials for all problems are up.