Hi everyone,

We are looking for problem-setters to join the ICPC India 2022 Panelists and contribute interesting tasks. If you or anyone you know is interested, please message me on this account or reach out to me on [email protected].

Eligibility:

• For Indians, you should have graduated in 2021 or before. School students can also contribute problems.
• Preferably, should have a track record of participation in similar contests or good profiles on online competition platforms like Codeforces, AtCoder, CodeChef, etc.

Compensation: Problem setters would be paid with the following per-problem rates (difficulty determined by the contest admin)

• Cakewalk: 1500 INR
• Simple: 2250 INR
• Easy: 3750 INR
• Easy-Medium: 6000 INR
• Medium: 9500 INR
• Medium-Hard: 13000 INR
• Hard: 19000 INR

Hello Codeforces,

I am happy to invite you to the Final Round of GeeksforGeeks's Code India Code.

We don't want to exclude passionate programmers from enjoying the problem set of the final round. Therefore, the contest will be open for all users but only participants who passed in the Qualification Round held on 6th March will be eligible for the rewards.

Contest Details:

• Finals Link: (Register Here)
• Time: Thursday, 10 March 2022, 7:30 PM to 10:00 PM IST.
• Number of Problems: 7 problems
• There will be no penalties for wrong submissions.
• Tie Breaker: Time to reach X points. (ie, time of last AC solution)

Prizes:

• Rank 1: Macbook Pro + Course voucher worth INR 12,000
• Rank 2: iPad Air + Course voucher worth INR 7,000
• Rank 3: Smart Watch + Course Voucher worth INR 3,000
• Rank 4-25: Tablets + Course Voucher upto INR 1500
• Rank 26-100: Noise Earbuds + Course Voucher upto INR 1500
• Rank 101-200: Noise Smartbands + Course Voucher upto INR 1500
• Additional Reward for top 1000 participants: Free access GeeksforGeeks Premium Plus (Quarterly membership) with which you get: Access to ad-free content, Personal notes, free access to Doubt-Assistance program.
• Prize distribution is limited to those residing in India only.

Problem Setting Panel:

• Contest Coordinators: Ashishgup, AvinashKartik
• Problem Setters: Ashishgup, AvinashKartik, Utkarsh.25dec, bunty_x, i.am.pratik, Omja
• Problem Tester: manpreet.singh, naitikvarshney, jaglike_makkar, vkswhy, aditya_01

Even though the prizes are only for Indians, I would like to invite others to participate — the problem-set contains interesting and challenging problems, with an estimated difficulty of a Div2 — Div1.5 round.

Good luck everyone. See you on the leaderboard!

Hello Codeforces,

I am happy to invite you to GeeksforGeeks's Pan-India Coding Contest – Code India Code. Showcase your coding skills and win rewards up to INR 7 Lakhs.

Contest Details are as follows:

Qualification Round: (Register Here)

• Sunday, 6th March 2022, 12:00 AM (IST) to 7th March 2022,12:00 AM (IST)
• In order to qualify in the first round, the participant needs to solve a minimum of 1 question out of 4 in 24 hours.

Final Round:

• Thursday, 10 March 2022, 7:30 PM to 10:00 PM IST
• Only those who qualify in the first round will receive a link to the final round.

Prizes:

• Rank 1: Macbook Pro + Course voucher worth INR 12,000
• Rank 2: iPad Air + Course voucher worth INR 7,000
• Rank 3: Smart Watch + Course Voucher worth INR 3,000
• Rank 4-25: Tablets + Course Voucher upto INR 1500
• Rank 26-100: Noise Earbuds + Course Voucher upto INR 1500
• Rank 101-200: Noise Smartbands + Course Voucher upto INR 1500
• Prize distribution is limited to those residing in India only.

Problem Setting Panel:

• Contest Coordinators: Ashishgup, AvinashKartik
• Problem Setters: Ashishgup, AvinashKartik, Utkarsh.25dec, bunty_x, i.am.pratik, Omja
• Problem Tester: manpreet.singh

Even though the prizes are only for Indians, I would like to invite others to participate — the problem-set (specially the finals) contains some interesting and challenging problems :D

Good luck everyone. See you on the leaderboard!

We invite you to participate in CodeChef’s January Cookoff, today — 23rd January from 8:00 PM — 10:30 PM IST.

The contest will be 2.5 hours long. There will be 7 problems in Div 1/2 and 8 problems in Div 3. It will be rated for all three Divisions.

Joining us on the problem setting panel are:

• Contest Admins: Ashish Ashishgup Gupta

• Head Admin: Alex Um_nik Danilyuk

• Tester: Takuki tabr Kurokawa

• Setters: Mohammed mohammedehab2002 Ehab, Jeevan JeevanJyot Jyot, Utkarsh Utkarsh.25dec Gupta, Daniel dannyboy20031204 Chiang, Rashad Mamedov Mammadov, Nayeemul Islam DrSwad Swad, SH Raiden Rony,

• Statement Verifier: Trung Kuroni Dang, Jeevan JeevanJyot Jyot

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes:

• The top 10 Global Division 1 users will get $100 each.
• The top 100 Indian Division 1 will get Amazon Vouchers worth Rs. 1500 each.

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

We invite you to participate in CodeChef’s December Cookoff, tomorrow — 19th December from 8:00 PM — 10:30 PM IST.

The contest will be 2.5 hours long. There will be 7 problems in Div 1/2 and 8 problems in Div 3. It will be rated for all three Divisions.

Joining us on the problem setting panel are:

• Contest Admins: Ashish Ashishgup Gupta

• Head Admin: Alex Um_nik Danilyuk

• Tester: Aryan aryanc403 Choudhary

• Setters: Takuki tabr Kurokawa, Ashish Ashishgup Gupta, Jeevan JeevanJyot Jyot, Utkarsh Utkarsh.25dec Gupta and Shiven shiven Sinha

• Statement Verifier: Trung Kuroni Dang

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes:

• The top 10 Global Division 1 users will get $100 each.
• The top 100 Indian Division 1 will get Amazon Vouchers worth Rs. 1500 each.

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

Admin Note:

Edit:

Congrats to the winners:

1. tourist
2. maroonrk
3. Petr

Also congrats to Nyaan for first AC on Tree and Brilliant Array.

Hi everyone.

CodeChef will be hosting the 5th Lockout Competition tomorrow, immediately after the end of SnackDown Round 1A. Lockout is an intense and fast-paced coding competition between two top competitive programmers, incorporating an esports kind of feeling in competitive programming.

This lockout match will be between 2 top coders, who were also (respectively) the winner and the host of the 2020 Lockout Championship:

• Alex Danilyuk (Um_nik) — a 7* coder on CodeChef with a peak rating of 3567 on Codeforces. He is the ICPC 2020 World Champion, and also the head CodeChef admin.
• Jay Leeds (Geothermal) — a 7* coder on CodeChef with a peak rating of a 2927 on Codeforces. He was a bronze medalist in the ICPC 2020 Invitational Contest, and also the Facebook HackerCup Finalist in 2020.

Lockout Details:

• Link: https://www.youtube.com/watch?v=F6AlVoCcmxM
• Time: 23rd October 9:00 PM IST.
• Contest Duration: 1 hour
• Participants: Alex Danilyuk (Um_nik) vs Jay Leeds (Geothermal)
• Commentators: This match would be hosted by Nischay Manwani (EnEm), who was also the host for the 1st CodeChef Lockout.

Lockout Rules:

• There will be 6 problems, with scoring distribution: 101, 202, 304, 408, 516, 632.
• If a participant solves a problem first, then his opponent cannot gain the score for that problem.
• The player with the higher score at the end wins.

The contest link will be posted when the stream starts. Good luck to the participants!

Edit: Contest link: https://www.codechef.com/LOCKOUT5

We invite you to participate in CodeChef’s September Cookoff, today — 19th September from 9:30 PM — 12:30AM IST.

The contest will be 3 hours long. There will be 7 problems in Div 1/2 and 8 problems in Div 3. It will be rated for all three Divisions.

Joining us on the problem setting panel are:

• Contest Admins: Ashish Ashishgup Gupta and Anton antontrygubO_o Trygub

• Head Admin: Alex Um_nik Danilyuk

• Tester: Anshu _runtimeTerror_ Garg

• Setters: abc864197532, Ashish Ashishgup Gupta, Utkarsh Utkarsh.25dec Gupta, Rahim Nots0fast Mammadli, flamestorm, Anirudh Krishna, Chaithanya Dragonado Shyam, Amruth amruth_kumar Kumar Tadikamalla, Kimi Wu, Manuj DarkSparkle Nanthan

• Statement Verifier: Trung Kuroni Dang

• Editorialist: Istvan iscsi Nagy, Keyur KeyurJain Jain

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Shivam Bohra, Aryan Agarwala, Meet myth_gemphir Singh Gambhir, Rajarshi RestingRajarshi Basu, Bharat Singla

• Mandarin Translator: Qingchuan qingczha Zhang

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Mohammad solaimanope Solaiman

• Vietnamese Translator: Team VNOI

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes:

Global Rank List:

• Top 10 global Division One users will get $100 each.
• Non-Indians will receive the prize via money transfer to their account.
• Indian users will receive Amazon vouchers for the amount converted in INR.

Indian Rank List:

• Top ten Indian Division One coders will get Amazon Vouchers worth Rs. 3750 each.
• The rest in the top 100 will get Amazon Vouchers worth Rs. 1500 each.
• First-time winners in Div 2 who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.
• First-time winners in Div 3 players who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

Admin Note:

I would like to welcome Anton antontrygubO_o Trygub and Yahor 244mhq Dubovik who have recently joined CodeChef and will be admins of CookOff and Lunchtime as well.

The winners of July CookOff to August Lunchtime have been finalized and will receive an email in the coming week.

Hi everyone.

CodeChef will be hosting the 3rd Lockout Competition today. Lockout is an intense and fast-paced coding competition between two top competitive programmers, incorporating an esports kind of feeling in competitive programming.

Today's match will be between 2 of the top 10 competitive coders in India:

• Nischay Manwani (EnEm) — a 7* coder on CodeChef with a peak rating of 2690 on Codeforces.
• Udit Sanghi (T1duS) — a 2 time IOI silver medalist with a peak rating of 2485 on Codeforces.

Lockout Details:

• Link: https://www.youtube.com/watch?v=wOHSEPLUKx0
• Time: Today, 4th September 7:00 PM IST.
• Contest Duration: 1 hour
• Participants: Nischay Manwani (EnEm) vs Udit Sanghi (T1duS)
• Commentators: This match would be hosted and cast by JeevanJyot (JeevanJyot) and Hriday (the_hyp0cr1t3), in a dual commentary for the first time.

Lockout Rules:

• There will be 6 problems, with scoring distribution: 101, 202, 304, 408, 516, 632.
• If a participant solves a problem first, then his opponent cannot gain the score for that problem.
• The player with the higher score at the end wins.

UPD3: Contest Link: https://www.codechef.com/LOCKOUT3

We invite you to participate in CodeChef’s August Cookoff, today — 22nd August, from 9:30 PM — 12:30AM IST.

The contest will be 3 hours long. There will be 7 problems in Div 1/2 and 8 problems in Div 3.

The contest will be rated for all three Divisions. The July Cook-Off also marks the launch of our new prize structure for global & Indian participants. More details are given below.

Joining us on the problem setting panel are:

• Contest Admins: Ashish Ashishgup Gupta.

• Head Admin: Alex Um_nik Danilyuk

• Tester: Shubham TheOneYouWant Jain

• Setters: Soumyadeep soumyadeep_pal_21 Pal, Aryan Agarwala, Deepak Deepak_23 Barnwal, Vishesh vishesh312 Saraswat, Daanish Mahajan, Anshu CoderAnshu Garg, Divyansh Obamium Rastogi, Shikhar shikhar7s Sharma, Alex Um_nik Danilyuk

• Statement Verifier: Trung Kuroni Dang

• Editorialist: Nishank IceKnight1093 Suresh

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Shivam Bohra, Aryan Agarwala, Meet myth_gemphir Singh Gambhir, Rajarshi RestingRajarshi Basu

• Mandarin Translator: Qingchuan qingczha Zhang

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Sakib SakibAbrar Abrar

• Vietnamese Translator: Team VNOI

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes:

Global Rank List:

• Top 10 global Division One users will get $100 each.
• Non-Indians will receive the prize via money transfer to their account.
• Indian users will receive Amazon vouchers for the amount converted in INR.

Indian Rank List:

• Top ten Indian Division One coders will get Amazon Vouchers worth Rs. 3750 each.
• The rest in the top 100 will get Amazon Vouchers worth Rs. 1500 each.
• First-time winners in Div 2 who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.
• First-time winners in Div 3 players who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

Edit 1: Usually, there is no bound on the stack limit, and is equal to the total memory limit of 1.5 GB. But due to a system configuration issue, the stack limit for C++ is temporarily set to 8MB. So, if you believe that your code requires larger stack limit, please include this in your code — https://codeforces.net/blog/entry/15866

Hello everyone!

T1duS, kshitij_sodani and I will be capturing the live updates of the Amritapuri 2020 Regionals, for teams to later refer to first-solves and the state of ranklist after various times. It is inspired by similar blogs in the past, like this, for example.

Important Information:

• Rank List (Scoreboard): https://codedrills.io/contests/icpc-amritapuri-2020-regional-round/scoreboard
• Contest Page: https://codedrills.io/contests/icpc-amritapuri-2020-regional-round
• Contest Blog: https://codeforces.net/blog/entry/93818
• There are 726 qualified teams who will be competing for the world finals slots from this regional!
• Contest Duration: 4 hours.
• Tentative Start Time: 18:30 IST

Announcements:

• All problems have a memory limit of 1GB, and solutions that exceed this would be marked as RTE instead of MLE due to some memory usage issues.

Live Updates:

• 17:50 — The contest is delayed by 30 minutes to 18:30, to ensure that everything is working fine.

• 18:30 — Contest starts! There are a total of 11 problems for the round. We have our first submission of the contest less than 1 minute in, but compilation error :'(

• 18:32 — Team Agla_ICPC_Phod_Denge from Indian Institute of Technology — Varanasi is the first team to solve the problem Thanos the Teacher to claim rank 1. (Ranklist)

• 18:40 — 310 teams have now solved Thanos the Teacher. Team Pay Attention from Dhirubhai Ambani Institute of Information and Communication Technology, Gandhinagar is the first team to solve the problem The Invasion of Balaji. (Ranklist) Balajiganapathi has been successfully invaded.

• 18:50: Team ShaamTakKhelenge from Indian Institute of Technology — Bombay is the first team to solve Hackerland. (Ranklist). Not having solved The invasion of Balaji, they claim the 18th spot.

• 18:55: Team ShaamTakKhelenge from Indian Institute of Technology — Bombay claims Rank 1 by solving 3 problems! (Ranklist)

• 19:00: Team Pay Attention from Dhirubhai Ambani Institute of Information and Communication Technology, Gandhinagar has claimed the first spot by having lower penalty with 3 problems solved! 5 teams have solved the same three problems. (Ranklist)

• 19:05: Team That's what she said (brownie points for the name) becomes the first team to solve Peace, Freedom, Justice, and Security and claims rank 4. Quite a few teams in the top 20 seem to be getting penalties on problems as well! (Ranklist). Team TeemCheems becomes the second team to solve Problem D, but is at rank 125 because they have only solved this problem along with the easiest problem!

• 19:20: Holy Trinity claims the first rank by solving DFS Sequence, also being the first team to solve that problem. Many other teams are still stuck at 3 solves. There are now 5 distinct problems that have been solved by atleast 1 team. This is the state of the scoreboard: Ranklist.

• 19:30 It's 1 hour into the contest. There is no change in the top rank, but we have 2 new distinct problems solved: Team ACassins from Indian Institute of Technology — Kanpur solved Lord of the Group. Team Amigos from solved Blizzard Blitz. This takes the count of distinct problems solved to 7. Problems dashboard after 1 hour.

• 20:00: 1 hour 30 minutes into the contest, Area151 from Indian Institute of Technology — Roorkee claim the top spot by solving Blizzard Blitz, with ACassins from Indian Institute of Technology — Kanpur following closely solving Lord of the Group, which takes them both to 5 solved problems! All other teams in top 10 have solved 4 problems. (Ranklist)

• 20:30: 2 hours into the contest, Area151 from Indian Institute of Technology — Roorkee retain their first spot and consolidate it for the near future by solving the 6th problem! Cheese Maggi joins ACassins with 5 solved problems to claim the third spot, while all others in top 20 have 4 solved problems. Problems Dashboard after 2 hours.

• 20:50: ACAssins solve Peace to reach the 2nd rank. GuptCoders and EvilGenuines solve 5th problems as well, to rise through the ranks! 4 problems still remain unsolved. (Ranklist)

• 21:30: The ranklist is now frozen. Cheese_Maggi from Indian Institute of Technology — Guwahati solves their 6th problem 15 seconds before the ranklist is frozen to reach rank 3! Pay Attention from Dhirubhai Ambani Institute of Information and Communication Technology, Gandhinagar is the first team to solve The Lag which takes them to Rank 6, and puts the number of distinct problems solved at 8. 3 problems still remain unsolved. We will update the future ranks/first problem solves (if any) after the results are announced! Problem dashboard after 3 hours.

Update: The final ranklist after plagiarism checks, etc, will tentatively be revealed along with winners at the discussion / ceremony on 21st August, Saturday. (Source)

Update 2: To not keep the contestants waiting, we have decided to release the ranklist early. Congratulation to all the teams!

Update 3: ICPC Asia Amritapuri Site Regional Round Problem Discussion

• Timing: Today 6 PM IST.
• Link: https://zoom.us/j/96036709555

Hi Codeforces,

ICPC Amritapuri 2020 Preliminary Round will be held on Codedrills today.

Contest Details

• Contest Link — ICPC Amritapuri 2020 Preliminary Round
• Date & Time — 7 August 2021, Saturday, 18:00 IST
• Duration — 2.5 Hours
• There will be 6 problems to solve
• Will follow standard ICPC scoring system (20 minutes penalty and 1 point per problem)
• The questions may not be sorted by difficulty

Selection Criteria

• 700 slots are available for the regional (out of ~4400 teams registered for online round)
• Top team from each institution is selected first, to compete in the regional round
• Rest of the slots are filled in the rank order

Clarifications

• Only ask the clarifications about the problems by messaging the private clarification group via discuss.
• Do not ask any doubts about the problems on this blog till the contest ends.

Problem Discussion

• There will be a problem discussion session at 6 PM IST, 9th August on YouTube — the details of which will be added to the Amrita ICPC page later, and also sent through email.
• The session video is available here.
• Solution slides used during the session can be accessed here.

Good luck to all the teams.

Edit: Due to the bug in the code editor during the contest, all penalties on duplicate submissions will be removed.

Edit 2 — Credits:

• Chief Judge: Balajiganapathi Balajiganapathi S
• Contest Admin: Vichitr Vichitr Gandas
• Problem Coordinators: Ashish Ashishgup Gupta, Kevin kevinsogo Atienza, Vaibhav xennygrimmato Tulsyan
• Setters: Ajinkya ajinkya1p3 Parab, Vichitr Vichitr Gandas, Divyansh failed_coder Verma, Udit T1duS Sanghi
• Testers: Kshitij kshitij_sodani Sodani, Ashish Ashishgup Gupta, Kevin kevinsogo Atienza, Naveen mnaveenkumar2009 Kumar, Soumyaditya socho Choudhuri, Shashwat SleepyShashwat Chandra, Suneet ScarletS Mahajan, Ajinkya ajinkya1p3 Parab, Vichitr Vichitr Gandas, Divyansh failed_coder Verma, Udit T1duS Sanghi, Ritul ritul_kr_singh Singh, Het hetshah1998 Shah, Varad playing_it_my_way Kulkarni, Aswin aswinashok44 Ashok, Mayank katana_handler Pugalia, Daanish 7dan Mahajan and Vaibhav xennygrimmato Tulsyan
• Platform Coordinator: Deepa deepa_panwar Panwar
• RCD: Maheshwara anandoham Chaitanya

Edit 3: The editorials for all the problems can be found on their respective problem pages. Huge shout out to kevinsogo for the detailed editorials with elaborate proofs :D

Results:

• Final ranklist has been published after removing the teams whose plagiarism reports came positive.
• Number of regional slots has been increased to 750. The current de-duping of colleges is final.
• If plagiarism accused teams successfully claim it to be false positive, they would be added to the list additionally. (ie the number of slots would further increase in this case).
• Check the final ranklist and qualified list here.

Regional Round:

• More details about registration and further process for Regional round is available here.
• Please use ICPC ID in the payment form where it asks for team ID.

We invite you to participate in CodeChef’s July Cookoff, today — 28th July, from 8:00 PM — 10:30 PM IST. Note the unusual time.

There will be 7 problems in all divisions.

The contest will be rated for all three Divisions. The July Cook-Off also marks the launch of our new prize structure for global & Indian participants. More details are given below.

Joining us on the problem setting panel are:

• Contest Admins: Ashish Ashishgup Gupta and Jatin jtnydv25 Yadav

• Head Admin: Alex Um_nik Danilyuk

• Tester: Aryan aryanc403 Choudhary

• Statement Verifier: Riley Monogon Borgard

• Editorialist: Vichitr Vichitr Gandas, Srikkanth srikkanthr R, Hriday the_hyp0cr1t3 G

• Setters: Souradeep Paul, Prasant prasant21 Kumar, Vichitr Vichitr Gandas, Soumyadeep soumyadeep_pal_21 Pal, Riley Monogon Borgard, Smarth Athem Mehta, Milos vladalos Puric, Evgeny 74TrAkToR Karpovich

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Shivam Bohra, Aryan Agarwala, Meet myth_gemphir Singh Gambhir, Rajarshi RestingRajarshi Basu, Istasis ista2000 Mishra, Bharat Singla

• Mandarin Translator: Qingchuan qingczha Zhang

• Vietnamese Translator: Team VNOI

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Sakib SakibAbrar Abrar

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes:

Global Rank List:

• Top 10 global Division One users will get $100 each.
• Non-Indians will receive the prize via money transfer to their account.
• Indian users will receive Amazon vouchers for the amount converted in INR.

Indian Rank List:

• Top ten Indian Division One coders will get Amazon Vouchers worth Rs. 3750 each.
• The rest in the top 100 will get Amazon Vouchers worth Rs. 1500 each.
• First-time winners in Div 2 who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.
• First-time winners in Div 3 players who make it to the top 200 for the first time will get Amazon Vouchers worth Rs. 750 each.

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

Edit: Contest is extended by 15 minutes.

tourist crosses 3800 rating (3821 to be exact) after Codeforces Global Round 15 — which will also make it the highest ever rating on Codeforces ever. Congratulations :D (orz)

3700 was achieved 4.5 years ago in January 2017 — any guesses when we will see 3900? :P

We invite you to participate in CodeChef’s June Lunchtime, this Saturday, 26th June, from 7:30 PM — 10:30 PM IST.

There will be 7 problems in Division 3 and 6 problems in Division 1/2.

Joining us on the problem setting panel are:

• Contest Admins: Ashish Ashishgup Gupta and Jatin jtnydv25 Yadav

• Head Admin: Alex Um_nik Danilyuk

• Tester: Felipe fmota Mota

• Setters: Daanish Mahajan, Jatin jtnydv25 Yadav, Bharat Singla, Lakshay lakshyaj21 Jain, Divyam divyamsingal01 Singal, Ritika kairakal Gupta, Nishan Retarded_Ape Singh, Pranav ExplodingFreeze Rajagopalan

• Statement Verifier: Riley Monogon Borgard

• Editorialist: Aman Retired_cherry Dwivedi

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Shivam Bohra, Aryan Agarwala, Meet myth_gemphir Singh Gambhir, Rajarshi RestingRajarshi Basu

• Mandarin Translator: Huang Ying

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Sakib SakibAbrar Abrar

• Vietnamese Translator: Team VNOI

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: Top 10 Indian and top 10 Global school students from ranklist will receive certificates and CodeChef laddus, with which they can claim cool CodeChef goodies. Know more here.

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Admin Note: This Lunchtime has a replay of some of the problems used in IOITC Day 2/3 (Final Selection round of Indian IOI Team). Thanks to all the testers who tested the IOITC as well!

Good luck and have fun!

We invite you to participate in CodeChef’s May Lunchtime, this Monday, 31st May, from 8 PM — 11 PM IST. Note the change in date and time.

There will be 7 problems in Division 3/2 and 6 problems in Division 1.

The May Lunchtime will have Junglee Games as the official contest recruiter! They are looking for SDE II & III Backend, SDE II & III Data, and SDE II Frontend roles for their fast-paced environment.

Joining us on the problem setting panel are:

• Admins: Ashish Ashishgup Gupta and Jatin jtnydv25 Yadav

• Tester & Statement Verifier: Riley Monogon Borgard

• Setters: Daanish Mahajan, Akash Whiplash99 Bhalotia, Aman Retired_cherry Dwivedi, Jatin jtnydv25 Yadav, Sundar Sundar Annamalai, Alex Um_nik Danilyuk

• Editorialist: Aman Retired_cherry Dwivedi

• Video Editorialists: : Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Bharat Singla, Shivam Bohra, Radoslav radoslav11 Dimitrov, Aryan Agarwala, Meet myth_gemphir Singh Gambhir

• Mandarin Translator: Huang Ying

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Sakib SakibAbrar Abrar

• Vietnamese Translator: Team VNOI

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: Top 10 Indian and top 10 Global school students from ranklist will receive certificates and CodeChef laddus, with which they can claim cool CodeChef goodies. Know more here.

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Admin Note: Special thanks to Um_nik for his help in selection/improving the problems. This Lunchtime has a replay of some of the problems used in IOITC Day 1/2 (Final Selection round of Indian IOI Team). Thanks to all the testers who tested the IOITC as well!

Good luck and have fun!

We invite you to participate in CodeChef’s March Cook-Off on 21st March from 9:30 PM — 12:00 AM IST.

There will be 7 problems in Division 3 and 6 problems in Division 2/1.

The March Cook-Off is going to have Gameskraft, Quadeye Securities, Dialpad, and BetterPlace as the official contest recruiters! Gameskraft is hiring for Javascript and Frontend Developers. Quadeye is on the lookout for brilliant Full Stack Developers in CodeChef’s community. Dialpad is looking to attract top talent from CodeChef for the role of Software Engineer. BetterPlace is looking to hire competent coders from the community for SDE 1 and SDE 2 roles.

Joining us on the problem setting panel are:

• Admins: Ashish Ashishgup Gupta

• Tester: Rahul amnesiac_dusk Dugar

• Setters: Daanish Mahajan, Akash Whiplash99 Bhalotia, Prashant fugazi Shishodia, Milos vladalos Puric, Smit l_returns Mandavia, Ahmet AhmetKaan Kaan Avcı, Evgeny, Isaac IsaacMoris Moris, Yuriy FairyWinx Fedorov

• Statement Verifier: Jakub Xellos Safin

• Editorialist: Aman Retired_cherry Dwivedi

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Bharat Singla, Shivam Bohra, Radoslav radoslav11 Dimitrov, Aryan Agarwala, Meet myth_gemphir Singh Gambhir

• Mandarin Translator: Qingchuan qingczha Zhang

• Vietnamese Translator: Team VNOI

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Mohammad solaimanope Solaiman

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: Since it is CodeChef's birthday month, the number of prizes being given out are double. That is, the top 20 Indian and top 20 Global participants will receive CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here.

There are also special prizes for women:

• Div 1: top 10 females (300 laddus)
• Div 2: top 6 females (150 laddus)
• Div 3: top 6 females (150 laddus)

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Admin Note: Special thanks to Um_nik for helping with shortlisting of problems and providing alternative approaches to the problems!

You can also view your last year's performance report of CodeChef on https://www.codechef.com/report/2021.

My Report

https://www.codechef.com/report/2021/ashishgup

We invite you to participate in CodeChef’s CodeChef’s February Lunchtime on 27th February from 7:30 PM — 10:30 PM IST.

There will be 7 problems in Division 3 and 6 problems in Division 2/1.

CodeChef is happy to announce Codenation Innovation Labs (CNIL) as a recruiter for February Lunchtime 2021. CNIL is hiring programmers for the Software Development Engineer role and its Junior Trilogy University (Intern Programme). Programmers from India and across the globe are invited by Codenation Innovation Labs to apply for opportunities at its organization.

Joining us on the problem setting panel are:

• Admins: Ashish Ashishgup Gupta

• Tester: Rahul amnesiac_dusk Dugar

• Setters: Ashish Ashishgup Gupta, Smit l_returns Mandavia, Hriday the_hyp0cr1t3 G, Jeevan JeevanJyot Jyot Singh, Pranav ExplodingFreeze Rajagopalan, Bhavyesh bhvdsi Desai, Prashant fugazi Shishodia, Pavel shishyando Shishikhin, Hazem zoooma13 Issa, Yuriy FairyWinx Fedorov and Vsevolod Pechalka Nagibin.

• Statement Verifier: Jakub Xellos Safin

• Editorialist: Aman Retired_cherry Dwivedi

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Bharat Singla, Shivam Bohra, Aryan Agarwala, Radoslav radoslav11 Dimitrov, Meet myth_gemphir Singh Gambhir

• Mandarin Translator: Gedi gediiiiiii Zheng

• Vietnamese Translator: Team VNOI

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Mohammad solaimanope Solaiman

• Hindi Translator: Akash devils_code Srivastava

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: Top 10 Indian and top 10 Global school students from ranklist will receive certificates and CodeChef laddus, with which they can claim cool CodeChef goodies. Know more here.

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Admin Note: Special thanks to Um_nik for his help and for suggesting better solutions for the harder problems.

Good luck and have fun!

We invite you to participate in CodeChef’s January Lunchtime on 30th January from 9:00 PM to 12:00 AM IST. Note the unusual time.

There will be 3 divisions, each division containing 6 problems!

This Lunchtime, ByteDance is joining CodeChef as the official contest recruiter! The tech giants, who have their presence globally established through a range of content platforms, are looking to hire for multiple positions for their Singapore office, including — Algorithm Engineers, Backend Engineers, Data Engineers, Data Scientist, Machine Learning Engineers, Research Scientists, Frontend Engineers, Quality Assurance Engineer, Research Engineers, Software Engineer, and Site Reliability Engineers.

Joining us on the problem setting panel are:

• Admins: Ashish Ashishgup Gupta, Jatin jtnydv25 Yadav

• Tester: Rahul amnesiac_dusk Dugar

• Setters: Jatin jtnydv25 Yadav, Ashish Ashishgup Gupta, Smit l_returns Mandavia, Akash Whiplash99 Bhalotia, Hriday the_hyp0cr1t3 G, Shubham TheOneYouWant Anand Jain, Daanish 7dan Mahajan, Utkarsh Utkarsh.25dec Gupta

• Statement Verifier: Jakub Xellos Safin

• Editorialist: Ishmeet Psychik Singh Saggu

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Bharat Singla, Shivam Bohra, Aryan Agarwala, Radoslav radoslav11 Dimitrov, Meet myth_gemphir Singh Gambhir

• Mandarin Translator: Gedi gediiiiiii Zheng

• Vietnamese Translator: Team VNOI

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Mohammad solaimanope Solaiman

• Hindi Translator: Akash devils_code Srivastava

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: The following will receive CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here:

• Top 10 Indian and Global Users (Overall)
• Top 10 Indian and Global School Students

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Admin Note:

This Lunchtime is a replay of Codeflows, so most problems do not have subtasks. We have added some easier problems for Div3 and Div2 problemsets, and the contest is delayed from its usual time to avoid clash with the final round!

Good luck and have fun!

Update:

Congratulation to the Codeflows onsite winners:

1. Petr (900/900 points — only one to solve all problems)
2. kabuszki (810/900 points)
3. bicsi (800/900 points)

Update 2:

The January Lunchtime is being made unrated due to the various issues that users faced.

With the high traffic that we have been getting recently, we have been facing issues with our infrastructure, and the contest experience has been bad. Keeping this in mind, we are postponing all rated short contests, till a time when we are sure that the contests can be held smoothly, and we've had a smooth testing round. In particular, the Starters contest scheduled for 31st January is being postponed indefinitely, till further announcements. Apologies for the inconvenience.

Note: The February Long Challenge will take place as usual.

We invite you to participate in CodeChef’s January Cook-Off, this Sunday, 24th January, from 9:30 PM to 12:00 AM IST.

There will be 3 divisions, each division containing 6 problems!

This CookOff, ByteDance is joining CodeChef as the official contest recruiter! The tech giants, who have their presence globally established through a range of content platforms, are looking to hire for multiple positions for their Singapore office, including — Algorithm Engineers, Backend Engineers, Data Engineers, Data Scientist, Machine Learning Engineers, Research Scientists, Frontend Engineers, Quality Assurance Engineer, Research Engineers, Software Engineer, and Site Reliability Engineers.

Joining us on the problem setting panel are:

• Setters: Ashish Ashishgup Gupta, Ayush FastestFinger Ranjan, Pranav ExplodingFreeze Rajagopalan, Hriday the_hyp0cr1t3 G, Kritagya Agarwal, Deepak Deepak_23 Barnwal, Ridhiman ridbit10 Agrawal, Jannik Kudla

• Admins: Ashish Ashishgup Gupta, Alex Um_nik Danilyuk

• Tester: Rahul amnesiac_dusk Dugar

• Statement Verifier: Jakub Xellos Safin

• Editorialist: Aman Retired_cherry Dwivedi

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Bharat Singla, Shivam Bohra, Radoslav radoslav11 Dimitrov, Aryan Agarwala, Meet myth_gemphir Singh Gambhir

• Mandarin Translator: Qingchuan qingczha Zhang

• Vietnamese Translator: Team VNOI

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Mohammad solaimanope Solaiman

• Hindi Translator: Akash devils_code Srivastava

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: The top 10 Indian and top 10 Global participants will receive CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here.

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

Edit: Sorry for the server issues — it is mostly resolved now, reloading once or twice should work. The contest is extended by 30 minutes and will remain rated.

Hi Codeforces,

After a recent comment about me not being able to reply to people — I thought I should answer all the questions I can in one place.

Feel free to ask me any questions you have! As a somewhat experienced Competitive Programmer, Problem Setter, Coordinator and DSA interviewer — I will try to answer all the questions I can.

I would also like to bring to your notice, a new YouTube channel (name subject to change) that I am starting with sirjan13 and antipr000, where we will be covering various CS aspects like Competitive Programming, Projects, System Design, etc.

My idea about my role in it so far is:

• Screencasts of contests I participate in, where I explain solutions as I solve
• Problem Solving: Discussing problems I find educational along with some interesting or commonly asked logical puzzles.
• Problem Setting Playlist — Some guidelines for Problem Setting, a tutorial on how to use Polygon and campus.codechef

Other possible things would be discussing interview questions, teaching some topics (I'm considering teaching Dynamic Programming — since almost all videos teach bottom-up, while I prefer and find top-down approach much more intuitive), lockout streams, etc.

Let me know any suggestions regarding what be most interesting for you to watch! I'm considering also making a video based on this blog — where I discuss all the relevant answers in detail.

We invite you to participate in CodeChef’s December Cook-Off, this Monday, 21st December, from 9:30 PM to 12:00 AM IST.
Note the unusual time.

You will be given a total of 9 problems (7 in Div2, 7 in Div1) to solve in a duration of 2.5 hours.

Joining us on the problem setting panel are:

• Setters: Utkarsh Utkarsh.25dec Gupta, Jeevan JeevanJyot Jyot Singh, Bhavyesh bhvdsi Desai, David ki0apa Horne, Vitaly oversolver Demidenko, Pranav ExplodingFreeze Rajagopalan, Andrzej Okrut Turko

• Tester: Rahul amnesiac_dusk Dugar

• Statement Verifier: Jakub Xellos Safin

• Editorialist: Rajarshi RestingRajarshi Basu

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Bharat Singla, Aryan Aggu_01000101 Agarwala, Radoslav radoslav11 Dimitrov, Shivam Bohra

• Admin: Ashish Ashishgup Gupta, Jatin jtnydv25 Yadav

• Mandarin Translator: Qingchuan qingczha Zhang

• Vietnamese Translator: Team VNOI

• Russian Translator: Fedor Mediocrity Korobeinikov

• Bengali Translator: Mohammad solaimanope Solaiman

• Hindi Translator: Akash devils_code Srivastava

Problem Submission: If you have original problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Prizes: The top 10 Indian and top 10 Global participants will receive CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here.

The video editorials of the problems will be available on our YouTube Channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Good luck and have fun!

Hi Codeforces!

I have become a problem reviewer on CodeChef and an admin. We are in need of high-quality problem proposals.

We were not able to reply to quite a few of the submissions regarding their status (Accepted/Rejected), and some may have even gone unnoticed — because the queue of problems has accumulated over the years.

We are now resetting the problem proposals — and now it is estimated that you should receive initial feedback about your problem within 2 weeks of problem submission! If any of your problem proposals submitted before August 2020 have not been accepted or rejected yet, please re-submit them — we apologize for the inconvenience.

The reviewers and admins on CodeChef are now:

• Um_nik
• 300iq
• jtnydv25
• Ashishgup
• Morphy

Further details are as follows:

• Compensation: The payment details and required difficulties of problems can be found in detail here. Brief summary:

• Submission Form: The form to fill for submitting ideas for any of the contests: Long/CookOff/LunchTime is here.
  
  After submitting the individual problems through the form, you can send an email listing the problems you want in a single short contest. Send it to [email protected] for Lunchtimes and to [email protected] for Cook-Offs.

Hi everyone!

I would like to invite you to another one of our rounds, that I set with my friends Jeel_Vaishnav, FastestFinger, Utkarsh.25dec, the_hyp0cr1t3 and ridbit10

We had two approved contests, but decided to merge it into one with more logical thinking ^_^

The round Codeforces Round 685 (Div. 2) that will take place on Nov/21/2020 17:35 (Moscow time). If your rating is less than 2100, this round will be rated for you; otherwise, you can participate out of competition.

I would really like to thank my co-setters and:

• 300iq for coordinating our round and always replying quickly.
• jtnydv25, antontrygubO_o, Monogon, Vivek1998299, tejas10p, l_returns, T1duS, kshitij_sodani, smile_boi, Ajax, JeevanJyot, ViciousCoder, Prosaic_26, vatsals1, saarang, _Damon, sac2607, matterhunt, Matir, Black_Eye, vatsal_nagelia, kalki411, ekanshi, Idkwhoami and vishesh312 for testing the problems.
• the_hyp0cr1t3 and ExplodingFreeze for testing as well as proofreading and making suggestions for the problems.
• MikeMirzayanov for Codeforces and Polygon platforms.

You will be given 6 problems with one additional subtask and 2 hours 15 minutes to solve them.

Good luck — let the games begin :D

UPD 1: The revised scoring distribution will be: $$$500 - 750 - 1250 - 1750 - (1500 + 1000) - 3000$$$

UPD 2: Editorial — Hope you guys enjoyed the round, we will hopefully be back sometime next year :)

UPD 3: Congratulations to the winners! :D

All Participants:

1. noimi
2. I_Love_Convex_Hull
3. zhouzhendong
4. dlalswp25
5. peti1234

Official Participants:

1. I_Love_Convex_Hull
2. ptd
3. afterall
4. Khas_Profit_LLC
5. imzzy

Hi everyone!

I would like to invite you to another one of our rounds, that I set with my friends FastestFinger, smartnj, the_hyp0cr1t3 and ridbit10.

The round Codeforces Round 651 (Div. 2) will take place on Jun/20/2020 17:35 (Moscow time). If your rating is less than 2100, this round will be rated for you; otherwise, you can participate out of competition.

I would really like to thank my co-setters and:

• isaf27 for coordinating our round.
• cerberus97, Devil, taran_1407, Keshi, Vivek1998299, KonaeAkira, demoralizer, Dragnoid99, meme, Rajdeep, aryanc403, lavish315, DeadlyCritic, Utkarsh.25dec, AmShZ, _Aaryan_ and erekle for testing the problems.
• MikeMirzayanov for Codeforces and Polygon platforms.

Based on past reviews, we have:

• Tried to make A easier and make the difficulty gradient a bit better
• Reduced the number of AdHoc problems and made the problemset more diverse

You will be given 6 problems and 2 hours 15 minutes to solve them.

Good luck! :D

The scoring distribution will be: $$$500 - 1000 - 1500 - 2000 - 2500 - (2000 + 1250)$$$

Upd: Quick editorial — Hope you guys found the problems interesting :D

Hi everyone!

I would like to invite you to my fifth Codeforces Round, that I set with my friends FastestFinger, Vivek1998299 and ridbit10.

We are excited to bring another contest within a week :D

With that said, I bring to your attention our new Codeforces Round 648 (Div. 2) that will take place on Jun/07/2020 17:35 (Moscow time). If your rating is less than 2100, this round will be rated for you; otherwise, you can participate out of competition.

I would really like to thank:

• FastestFinger, Vivek1998299 and ridbit10 for helping with preparing problems and giving new ideas.
• 300iq for coordinating our round.
• Um_nik, antontrygubO_o, ksun48, Jeel_Vaishnav, aryanc403, Savior-of-Cross, KonaeAkira, _Aaryan_, Ari, Devil, lavish315, AmShZ, Shuba_Buba and smartnj for testing the problems.
• the_hyp0cr1t3 and BarseSnow for testing as well as proofreading and making suggestions for the problems.
• MikeMirzayanov for Codeforces and Polygon platforms.

You will be given 7 problems and 2 hours 15 minutes to solve them.

Good luck! :D

The scoring distribution will be: $$$500 - 750 - 1250 - 1500 - 2000 - 2500- 3000$$$

Upd: Quick Editorial — Hope you guys enjoyed the contest :D