In our recent annual recap, we talked about what a huge year this has been for us. Not only did we embark on a number of short projects like workshops and summer camps, but we also successfully completed our 5th SnackDown contest. All-in-all it’s been a busy year for us, full of twists and turns but the ride isn’t over yet!

Every year, during our birthday month, we try to bring our community one big launch or feature that you’ve all been craving, and we can proudly announce that the Birthday present you’re all getting this year is a brand spanking new discussion forum! Everyone say hello and welcome to the new CodeChef discussion forum.

While our existing forum has served us well, we knew it was too slow to keep up with our growing community. So this year, we finally made the call to retire old faithful and move on to a newer and faster Discourse-based forum. Our new and improved forum will have a clean, new look and will boast a number of improvements. You’ll now get convenient single line conversations (with the option to expand replies), informative link previews, and a mobile-friendly format. CC Discourse will be a seamless extension of your CodeChef account which means you’ll have the same username.

Over the years each of our team members, as well as our 1 million strong community, had thousands of conversations on discuss and we certainly couldn’t wipe all those stories away. All your treasured conversations will be imported to the new forum. So what are some of the changes you’ll find? Let’s start with a difficult one: unfortunately, we can no longer accommodate karma points. Our new forum does not support this feature, so we took the call to scrap it in favour of many other benefits.

You’ll also notice that posts on the new forum cannot be upvoted or downvoted. However that doesn’t mean that you can’t show your appreciation for a great post, you can always use the like buttons. The new forum will also have Single Sign-On, which means that your CodeChef account will be used to sign you into the forum. You do not need to create a separate profile or account to use this forum. This is only limited to authentication. After getting user authentication from the CodeChef website, the session is independently maintained on the new forum.

CodeChef was designed and created to help programmers acquire the tools to improve their own skills and abilities. Discussion and debate are a huge component of learning and our aim has always been to provide a platform that lets you do just that. Whether you’re in Russia or Rajasthan, China or Chile, you can always visit the CodeChef discussion to have your own doubts clarified, to post a solution, or to connect with other programmers on the platform.

Now let’s take this discussion over to our new forum!

As always, if you face any issues feel free to send a description of the problem you’re facing, to bugs@codechef.com.

CodeChef has completed 10 years of being India’s most popular competitive programming platform, but we’re only getting bigger and better with time! 2018 was a huge year for us, we kicked things off with the launch of rating divisions in March of 2018. The new divisions allow for fair competition among our users, with Division 2 users now able to compete against each other for prizes and ranks in our contests for the first time. We also focused on promoting competitive programming among women through a dedicated Women’s Day campaign.

Through March and April, our team lead Anup Kalbalia, was jetting from one college to another to spread the word about CodeChef and encourage participation in the ICPC. Several universities had the benefit of this orientation session and this year we hope to reach even more. At the end of the month, Anup also represented CodeChef at the ICPC where he spoke at the ICPC CLIS 2018 about competitive programming & sustainability. Anup was also invited to offer live commentary on ICPC’s global online channels. A proud moment for CodeChef!

May was a jam-packed month for us! We held a special workshop for School Teachers at ABV-IIITM Gwalior, we felicitated the young Indian programmers who represented the nation at the prestigious IOI competition, we held our first ever open programming workshop in Hyderabad, as well as our summer school programming workshops.

Through June and July, our workshops continued, with a special focus on teacher training. CodeChef offers a series of workshops for different groups, including DSA training for college students and professionals, pedagogy training for teachers and professors and Python training for school teachers in Pune in collaboration with CSPathshala. 2018 saw us administer every kind of workshop in our repertoire with tremendous success.

In August, we had a trio of achievements to our credit. Our Alibaba Hackathon represented not only our very first partnership with a major international company but also our very first Hackathon as well as the public launch of our API. This was a huge feat for us, and we were heartened by the community’s amazing response to our API. You can check out some of the interesting app ideas that we received from you all here. September saw the launch of SnackDown 2019 registrations which kept the team busy.

There was no slowing down in the last quarter as this period saw the launch of online qualifying rounds for both SnackDown and ICPC 2019. We powered through three rounds of elimination for SnackDown and finally by December, we had our top teams.

December also found our team traveling to all ends of the country for the much anticipated ICPC Regionals in Kharagpur, Kolkata, Kanpur, Gwalior, Pune, Amritapuri and Coimbatore. Meeting competitive programmers from every corner of the country was an exciting and exhilarating moment for us. Our T-shirts had a new and rather bold statement, and they were once again a huge hit with the participants.

In January, there wasn’t a moment to breathe as SnackDown preparations were in full swing by the new year. But our Schools team found a couple of days to dedicate to ICO related activities. CodeChef is the community and platform partner of IARCS for the ICO, as part of this partnership we not only conducted the ZCO and INOI exams, we also conducted our first ever completely volunteer-driven INOI workshops in 10 cities. These workshops were created to introduce school students to some of the more advanced topics that were essential to compete at the INOI. Not only did our attendees love them, our intern Abhishek enjoyed teaching them too!

SnackDown 2019 in February turned out to be a fabulous experience. Though hosting in a foreign city meant that we were in for a few surprises, CodeChef took everything in their stride and worked hard to make the contest and the trip to Bengaluru, memorable for all the teams who attended (that includes Team CodeChef!)

Now on our 10th birthday, we’re going right back to the beginning of the roller-coaster for another year full of coding excitement and magic as we embark on ever more new projects, and work together to deliver more experiences to our growing community.

Cheers,
The Chef

Hello from Bangalore, India!
We have 38 teams participating this year from across the globe for Snackdown’s Onsite Finals.

I’ll be giving live updates here. If you have any questions related to the contest, please ask them in the comments.

The mirror contest has begun. You can see the problems on the mirror contest page — https://www.codechef.com/SNFL19MR/

[Public ranklist](https://www.codechef.com/public/rankings/SNCKFL19)

10:30am — Contest has begun.

10:39am — [user:LHiC,2019-02-16] from team login228 gets the first accepted submission of the contest.

Several other teams have submitted a solution for the same problem within the next minute.

10:52am — login228 solve their second problem of the contest and lead the ranklist.

10:55am — 24 teams have solved at least one problem.

11:00am — Team End Time ([user:dotorya,2019-02-16] and [user:zigui,2019-02-16]) solve their 2nd problem and lead the ranklist.

11:10am — 9 teams have solved 2 problems so far. Team pastry ([user:tourist,2019-02-16] and [user:qwerty787788,2019-02-16]) are currently at rank 3.

11:15am — We now have 4 distinct problems solved in the contest.

11:22am — All school teams have solved 1 problem so far. Antipr00 (Adhyyan1252 and rajarshi_basu) lead on the basis of time penalty.

11:27am — pastry solve their 3rd problem (XYPRESQ) and lead the ranklist. havkapapstvo solve their 3rd as well. They are now at rank 2 with a time penalty difference of 7 minutes.

11:35am — pastry solve their 4th problem — MAGARR

11:40am — contribution (Radewoosh and Swistakk) and osass (jiry_2 and wxhtxdy) solve the 6th distinct problem of the contest — RAFFLE

login228 (LHiC) solves RAFFLE as well and moves to Rank 2

12:00pm — login228 solve their 5th problem — pastry is no more at rank 1.

umnik_team (Um_nik and Merkurev) have solved 5 problems and are now at rank 2. pastry is no more at rank 2.

12:15pm — Pastry solve RAFFLE and they’re back at rank 1.

12:41pm — login228 solve ORDNCHS.

12:42pm — Pastry solve CIRCBIN. They are only 2 minutes ahead of login228 in time penalty.

12:49pm — login228 and pastry have made submissions within a gap of 12 seconds of each other.

login228 solve MAGARR with 7 penalties. pastry solve ORDNCHS

pastry is now leading with 7 problems solved and a lead of 1+ hour in time penalty

1:30pm: contribution (Radewoosh and Swistakk) solve KSUFFIX.

1:31pm: contribution solve CIRCBIN within 1 minute of their previous AC submission!

1:42pm: osass (jiry_2 and wxhtxdy) solve their 8th problem — CIRCBIN and move to the top of the ranklist!

pastry follow them at rank 2 and umnik_team at rank 3 with 7 problems each.

2:20pm: pastry solve their 8th problem and move back to rank 1.

2:30pm: Scoreboard is now frozen.

The top 3 teams have solved 8 problems each. Only 1 team has solved STRSUM and no team has solved RIVERLND. Stay tuned to know the final results!

Our SnackDown 2019 champions are Gennady Korotkevich and Borys Minaiev of team Pastry! In second place were Oleg Merkurev and Aleksei Daniliuk of team Dandelion. Yuhao Du and Ruyi Ji of team osass took the third spot. Shih-Yu Wang and Zi Song Yeoh of team zscoder<(_ _)> who were the top school team while Xiaoou Zhou and Jiayi Mao of team team03060724 were the top women’s team.

Today we’re in conversation with Abhishek Pandey, known in the CodeChef community as vijju123, about his experience as a volunteer at one of our INOI Workshops in Mumbai that was conducted on the 12th and 13th of January. For those who don’t know him, Abhishek is an active competitive programmer with a max rating of 6 stars on CodeChef, who caught our eye by being an active and helpful contributor to our discussion forum. We reached out requesting him to be one of our discussion forum moderators and he readily agreed. Abhishek also has been a tester, editorialist (a favorite with the CodeChef community) and is the admin of the external rated contests hosted on CodeChef.

Abhishek’s dedication to the community and his hard work earned him an internship with CodeChef’s Contest team. As a part of his internship, he visited our Mumbai office for a week and we roped him in for this workshop, without getting much of his consent Fortunately he enjoyed himself and our students loved interacting with him.

Here’s what one of the participants of the workshop had to say,

“I was initially extremely afraid of Graph Theory and was taken aback by how easy the trainers (especially Abhishek Pandey) made it seem.”

Well, that was a lot from us, now let’s hear from Abhishek about his experience.

Did you enjoy teaching this workshop?

“It was a nice experience teaching the blooming competitive coders in INOI workshop ”

I always wanted to try my hand at teaching. I kind of developed a liking for it while tutoring my younger brothers and cousins :p. But that’s an altogether different story.

Why the workshop was a nice experience in the first place?

Because of the kids . When someone comes with a will to learn, even the teacher’s wish to teach gets rekindled. It’s a lot of fun to teach someone who is curious about the subject.

What are your feelings towards the workshop?

Two words – Positivity, and Responsibility.

The workshop overall is a positive experience, and no doubt such ventures should be encouraged – even at the college level.

Responsibility – because you have to make sure the kids don’t go home disappointed! That’s why I tried my best- even if it meant preparing/revising lecture plan at 4 am in the morning after finishing work. I was happy to know that the workshop was up to my mentor’s standards when she assigned the role to me.

Share some tips/pointers

• Peer learning is helpful and helps sustain motivation
• The struggle is inevitable. If you don’t face struggles in your journey- then you’re doing it wrong
• If you are relying too much on someone else to solve your doubts, you won’t know how to solve them yourself!
• Most people don’t understand tutorials because they are intimidated by the unknown.
• Don’t follow the herd, lead it instead. Find DP (Dynamic Programming) tough? Well, you should be looking for a challenge and not shying away from it!
• Time management is a skill that’s going to help you throughout life.

We thank Abhishek for his dedication and urge more volunteers to join CodeChef in our Schools initiative. You can learn more about becoming a volunteer here: https://www.codechef.com/school/volunteer

We’ve had a gruelling ICPC season so far and here we are today to give you live updates from the last Indian ICPC regional of the year being held at Amrita University.
This is the largest regional in Asia with over 270 teams participating across 2 sites – Coimbatore and Amritapuri.

We are expecting the contest to begin in 5 minutes.

Every regional this year has had nail-biting finishes. Today’s contest is expected to be even more intense with a lot of top teams competing against each other.

UniverseIsDeterministic (CMI) with Rajat De in their team and GeometryIsLove (IITM) with Teja Vardhan Reddy in their team who were rank 1 and rank 2 respectively at the Kgp regional, are participating in today’s contest.

Far_Behind (IITD) who solved 3 problems in the last 1 hour at the Kgp regional to end up at rank 3 will also be participating today.

tesla_protocol (IIIT Hyderabad) led the ranklist for a long, long time in the Gwalior regional but ended up at rank 3 after a magnificent performance by BhayanakMaut and ButterRoti. They will be targeting a podium finish today as well.

Hold right there Sparky!! (IIT Roorkee) won the Kolkata regional with a great performance in the last 1 hour. Will they take it easy today as they already have a potential WF slot in hand or fight it out?

Other teams like Microwave-O(1), proofByAC and MexFlow, to name a few, have done well in previous regionals but haven’t made it to the top 3-4 ranks. They will be itching to get that WF slot today.

Public Ranklist – https://www.codechef.com/public/rankings/ACM18AMR

9:45 am: Contest has begun

9:47 am: Kimi no Na wa (IIT Roorkee) score the first AC, 2 mins 19 seconds into the contest.

9:52 am: 7 minutes into the contest, 121 teams have solved 1 problem.

The title of the first problem is – “Is it a Cakewalk problem”. It definitely seems to be one

9:54 am: bits please solve CNTFAIL – first team to solve 2 problems, now at Rank 1.

9:57 am: tesla_protocol submit ARMYFGT and so do MexFlow at a difference of 4 seconds. Let’s see if their submissions are correct…

Yes they are! tesla_protocol move to rank 2 and MexFlow move to rank 3 respectively with a time difference of 23 seconds.
tesla_protocol has a time penalty gap of 40 seconds with bits please who are at Rank 1 currently.

10:00 am: UniverseIsDeterministic gets a WA on ARMYFGT.

Most teams are using Python to solve ARMYFGT.

10:07 am: tesla_protocol solve CNTFAIL and lead the ranklist with 3 problems solved.

10:28 am: 37 teams have solved 3 problems so far. tesla_protocol leads the pack, proofByAC is at Rank 2 and Laila (IIT Roorkee) is at Rank 3.

10:31 am: Team “ForgotToWarmup” just got WA on a problem called “SAUNA”.
“Apt team name”, says Balajiganapathi from the judging panel.

10:36 am: UniverseIsDeterministic are the first team to solve PALPATH. They are now at Rank 1 and we have 4 problems solved in total.

GeometryIsLove submit AVLBLT aaaaand it’s correct! They immediately replace UniverseIsDeterministic at the top of the leaderboard.

10:38 am: dilliMetro solve MARTING1, their 4th problem. They replace GeometryIsLove at Rank1.

The last 3 minutes have been quite exciting.

10:42 am: Laila (IITR) solve their 4th problem with 0 penalties and now lead the pack.

10:52 am: Hold right there Sparky!! from IITR solve their 4th problem and are the first to solve ALFRED, the 7th problem of the contest. They are now at Rank 3.

10:58 am: UniverseIsDeterministic solve ALFRED. They have now solved 5 problems and are back at Rank 1.

11:01 am: GeometryIsLove solve SAUNA. They have now solved 5 problems are at Rank 2. 8 distinct problems solved.

11:04 am: DeathNote from IITB solve ALIENINV. A very interesting, mathy problem. 9 distinct problems solved.

11:13 am: Math_maniac solve BALSUB. 10 distinct problems have been solved in the contest.

11:19 am: tesla_protocol solve MARTING1 and take away the lead from UniverseIsDeterministic.

11:21 am: Hold right there Sparky!! solve MARTING1 and are now at Rank 1.

This is turning out to be a very competitive contest. It seems to be quite non-trivial to predict who the winner will be.

11:44 am: GeometryIsLove get TLE on PALPATH.

12.54 pm: Laila has seized the lead by solving their 8th problem!

12.55 pm: bits please has also solved their 8th problem pushing UniverseIsDeterministic to third place. UniverseIsDeterministic has got 2 WAs on REFORMS, but can they make a comeback?

1.16 pm: Team UniverseIsDeterministic has solved SAUNA and jumped back to rank 1!

1.18 pm: The CMI team’s lead was short lived as bits please have now secured rank 1 with their 9th problem

1.38 pm: bits please has strengthened their lead by solving their 10th problem ALIENINV

1.45 pm: The rank list is now frozen, but you can still predict your winners here: https://goo.gl/forms/ng8a7xKBujzNAPtl1

Team bits please from IIT Kanpur secured the first rank while Hold right there Sparky!! and Laila – both from IIT Roorkee – landed the 2nd and 3rd spot respectively. Congratulations to the winning teams!

It’s day 2 of ICPC Regionals in India and today’s competition is taking place at two sites: IIIT Pune and IIITM, Gwalior. Keep up with all the contest action here!

Live Ranklist: https://www.codechef.com/public/rankings/ACM18GWR#

10.53 am: It’s been roughly an hour since the #ICPCRegionals at #IITTPune and #IIITMGwalior began and Team BhayanakMaut have swept into an early lead with 4 problems solved! tesla_protocol from #IIITHyderabad are close behind also with 4 problems.

11:18 am: tesla_protocol from IIITH lead the ranklist with 5 problems solved. 6 teams have solved 4 problems now. BhayanakMaut from IIITD are at Rank 2 and have a 40 minute time penalty difference from bits please who are at Rank 3.

11:24 am: BhayanakMaut solve their 5th problem and move up to rank 2!! Merely 4 minutes of time penalty gap separates them from tesla_protocol.

Top 4 teams have 5 problems solved now.

We also have 4 school teams participating in today’s regionals – antipro, exun_coder, bipolar and codeup_017.

antipro from Bodhicariya Senior Secondary School, Kolkata have solved 3 problems and are at rank 18 currently.

11:34 am: tesla_protocol get their 6th correct submission and extend their lead over BhayanakMaut.

They have had an incorrect submission on another problem (SIRUSERI) for a long time now. That problem would most likely be the next one they would target ACing.

Their solution seems to be almost there, but they seem to have made a minor mistake. The solution involves very less code, so once they spot the error they should be able to fix their code and submit quickly.

Time penalties could prove to be very costly in such a close contest. They should test out their solution rigorously before submitting!

11:40 am: Ranks 2 to 9 now have 5 problems solved.

11:45 am: tesla_protocol get another WA on SIRUSERI! They have 2 WAs on this problem now.

bits please solve THSTRS, their 7th submission and are now at Rank 5.

bits please, ButterRoti and Supercalifragilistic have solved 6 problems each now.

bits please is 20 minutes behind tesla_protocol. If they avoid WAs in the next 20 mins and get an AC, they could displace tesla_protocol from the top of the ranklist.

11:48 am: BhayanakMaut solve 6 problems and land at rank 3.

What a contest this is turning out to be! Top 5 teams have 6 problems solved and are separated just by time penalty.

11:54 am: tesla_protocol solve SIRUSERI, their 7th correct submission.

BhayanakMaut AC their 7th problem within 2 seconds of tesla_protocol!! They are separated by just 1 minute of time penalty now! Is this competitive programming or Formula 1?!

“bits please have 10 minutes to get their 7th AC to get to Rank 1.” – Jatin Yadav

12:02 pm: Persistent Matroid (IIT Kgp) solve 7 problems and are now at Rank 3.

With 3 hours to go in the contest, 7 problems are solved and 4 problems remain unsolved.

12:11 pm: bits please get WA on THSTRS. They also got a TLE before that.

12:18 pm: tesla_protocol solve WALKTREE, their 8th accepted submission.

12:26 pm: BhayanakMaut solve WALKTREE as well. They had a very very minor implementation bug that led to a WA. They are at Rank 2 now with a time difference of 39 minutes from tesla_protocol.

12:32 pm: ForTheDamagedCode from NITK are the first team to solve GAMEOFNUM. They have 6 problems solved in total now.

ButterRoti solve their 8th problem and are now at Rank 3.

12:34 pm: bits please solve their 8th problem 2 minutes after ButterRoti and are at Rank 4.

12:49 pm: BhayanakMaut solve 9 problems and take away the lead from tesla_protocol!

1.18 pm: BhayanakMaut are in the lead followed by ButterRoti from IIT Patna and bits please. Each team has solved 9 problems

1.26 pm: ButterRoti is now in 2nd place! Can they steal the top spot?

1:50 pm: BhayanakMaut seem to have a nearly correct solution for POLYSTR. Jatin Yadav and Animesh point out that they aren’t clearing their dp table and that’s their only bug! They have been debugging it for 15+ minutes now.
The setters are going to submit their code in practice with an extra statement to clear the table to see if it would AC.

1:54 pm: “Their solution passes by memsetting the dp table.” – Jatin and Animesh
Let’s see how much time BhayanakMaut takes to figure that out.

2:00 pm: The leaderboard will freeze in 10 minutes from now. We have 6 teams with 9 problems solved at the moment. Share your ranking predictions in the comments!

2.02 pm: tesla_protocol is back at rank 2 and have pushed ButterRoti to rank 3. BhayanakMaut maintains their lead.

2:07 pm: BhayanakMaut solve POLYSTR! They are at rank 1 with 10 problems solved now.
tesla_protocol seem to have a O(N^2) DP solution for POLYSTR too.

2:10 pm: Ranklist is now frozen.

The contest has ended. You can view the final ranklist here.
Congratulations to the winning teams BhayanakMaut from IIIT Delhi, ButterRoti from IIT Patna and tesla_protocol from IIIT Hyderabad!
Stay tuned for updates from the next ICPC Regionals at GNIT Kolkata and UIET Kanpur.

Our 66th Lunchtime took place on November 24 and it was a showdown to remember with a major rank list shake-up! Keep reading to read who gained ratings and who lost them in the November Lunchtime.

Leading the pack in Div 1 was uwi, who is presently ranked number 1 in Japan and number 5 globally. Following our 100th Cook-Off, we mentioned in our Contest Recap that uwi was less than a hundred rating points short of a spot in the global top 5. Looks like, uwi took up the challenge and dethroned China’s ACRush to claim the world number 5 spot. But ACRush is a regular in our Long Challenges, stay tuned to see if he makes a comeback next month.

Other notable mentions in Div 1 are zemen from Russia who moved to 5-star status in this competition and rns5 from North Korea who went from 5 stars to 6. natsugiri, also from Japan, rounded out the top 4, all of whom scored 500. rns5 has risen rapidly through the rating system, gaining a whopping 6 stars since joining CodeChef in August this year. He needs just about 182 rating points to join another, rns4 another celebrated Kim Il-sung University student, in the 7-star club.

In Div 2 mzuev from Russia, took the lead going from 2 to 3 stars in the process. Close behind was xuzijian629 from Japan who was participating in a CodeChef contest for the very first time and made a rating jump of 275 points, which is the maximum jump possible! He promises to be a coder to watch out for. Dubai based antrikshh claimed the third spot, with Indonesia’s sidiqha in 4th place. While no Indians made it to the top 10 in Div 1, 4 Indians secured spots in Div 2’s top 10. A huge shoutout to its_ulure, mindjolt, radon12 and shubham698.

School students were well-represented in the November Lunchtime Div 1 with 9 of them earning places in the top 20. The best performers were tmwilliamlin from Taiwan who was at rank 5, farhod_farmon from Tajikistan at rank 7, and Ukraine’s adalbert at rank 8. Div 2’s best performing school students were its_ulure from India at rank 5, arafat_01 from Kazakhstan at rank 9, and fake_here from China at rank 15.

Special mentions go to female coders amina283 from Azerbaijan and mh755628 from Bangladesh, both of whom made it to the Div 1 top 100. In Div 2, it was hui_yin from Hong Kong and India’s own viralivora who reached the top 100.

Joining xuzijian629 on the list of users who made sizeable rating jumps are mzuev from Russia and tyakennikku from China who improved their rating by 233 points each. Indonesian sidiqha enjoyed a rating jump of 209 points while India’s own its_ulure from West Bengal, increased his rating by 201 points.

The highest participation this month came from  India, followed by Bangladesh and Ukraine. India’s National Institute of Technology, Kurukshetra and Jaypee Institute of Information Technology had the most participants in this Lunchtime. If you’d like to spread the word about competitive programming in your school or college, start by creating or joining a CodeChef Campus Chapter today.

Probability (PPAP) emerged as the least solved problem of both Divisions with no successful submissions in Div 2 and just 7 in Div 1. Event (EVENT) was the most solved problem of Div 2 with 769 successful submissions out of a total of 5738 while in Div 1, Beats and Pieces (BPS) got 169 successful submissions from a total of 576. Check out the editorials for this Lunchtime’s problems here.

As we conclude this recap, we tip our hats to our problem setting panel:

• Setter: Rehim Memmedli (nots0fast)

• Tester: AmirReza PoorAkhavan (arpa)

• Statement verifier: Jakub Safin (xellos0)

• Editorialist: Hussain Kara Fallah (deadwing97)

• Translators:

  • Mandarin Translator: Hu Zecong (huzecong)

  • Vietnamese Translator: Team VNOI (khanhptnk)

  • Russian Translator: Fedor Korobeinikov (gomelfk)

  • Bengali Translator: Mohammad Solaiman (solaimanope)

  • Hindi Translator: Akash Srivastava (devils_code)

And as always, many thanks to our problem panel admin Hasan Jaddouh (kingofnumbers) whose hard work helped us pull the contest together.

The November Cook-Off may be behind us, but the excitement still hasn’t left our system! This was CodeChef’s landmark 100th Cook-Off and we rewarded not only our top performers but also a bunch of participants, selected randomly, to show our gratitude. Keep reading to know what went down during this historic Cook-Off.

Over in Div 1, Japan’s number 1 competitive programmer uwi, stole the show by securing the first rank while the second spot went to India’s own rahuldugar. During this Cook-Off IITian rahuldugar increased his rating to 2484, he only needs a few more rating points to join the exclusive 7-star club. We’re rooting for you, Rahul! uwi, meanwhile, has enjoyed top billing in Japan (national rank 1) and a global rank of 8 for a while and only needs around 70 rating points to steal ACRush’s spot in the global top 5. We’ll be waiting to see if he takes up the challenge. (UPDATE: We may have inadvertently predicted a huge rank shift for uwi! Wait for our Lunchtime recap to know more!)

Also in Div 1, artistmusicant and ll931110 who were at ranks 3 and 4 respectively, both graduated to 5 stars during this Cook-Off. artistmusicant was notably the only female programmer in the top 10 during this Cook-Off so hope she inspires all the girl-coders out there!

grikukan from Russia stirred things up in Div 2 where he earned the first rank. This University student is teetering on the brink of Div 1 with a rating of 1786, but he’s had a tumultuous journey through CodeChef’s contests slipping from 6 stars to 3 stars last year, and nobody knows better than us that anything can happen in a CodeChef contest! petergendy4 from the US swooped into second place with a score of 2, and in the process went from 3 stars to 4.

Among school-level coders, sanroylozan from Hungary, evpipis from Greece and adhyyan1252 from India were a cut above the rest. These school students are all 6-star coders, we hope they can all graduate to 7 stars soon and give the more experienced coders some competition.

There were no seismic shifts in this month’s Div 1 and Div 2 order, but 61 users from Div 2 graduated to Div 1 while over double that number (137) fell back to Div 2 from Div 1. Just a reminder that in the word of competitive programming, you can’t get too comfortable with your rating! You have to keep practising and competing to stay on top.

As far as participation goes, India had the most participants with over 2000 coders taking part in the Cook-Off. The United States and Bangladesh were tied in second place with 23 participants each while 9 Cook-Off coders were from Russia.

The problem Truth and Dare, emerged as the most solved problem with 1781 successful submissions out of a total of 4355 while Data Pipelines was the least solved with 0 successful submissions in Div 2. In Div 1 Elephants in a Pond got just 1 successful submission. You can check out editorials for all the Cook-Off problems here.

We conclude this recap with a big thanks to our problem setting panel:

• Setter: Praveen Dhinwa (dpraveen)
• Tester: Teja Vardhan Reddy (teja349)
• Statement verifier: Jakub Safin (xellos0)
• Editorialist: Taranpreet Singh (taran_1407)
• Translators:
  • Mandarin Translator: Hu Zecong (huzecong)
  • Vietnamese Translator: Team VNOI (khanhptnk)
  • Russian Translator: Fedor Korobeinikov (gomelfk)
  • Bengali Translator: Mohammad Solaiman (solaimanope)
  • Hindi Translator: Akash Srivastava (devils_code)

And an extra special thanks to our problem panel admin Hasan Jaddouh (kingofnumbers) who went above and beyond to make our 100th Cook Off memorable for everyone!

At CodeChef, we take pride in our innovative community that is constantly striving to create a better environment for all of us. In recent times, we received a lot of requests to open up our API so that our users could develop apps that would benefit the entire community and add new functionalities to the CodeChef platform.

Finally, on the 27th of August 2018, we launched our API and held our very first Hackathon – the CodeChef API Hackathon powered by Alibaba Cloud. This hackathon was held in the spirit of innovation; we already knew that our community was enthusiastic about using CodeChef data to create new resources for each other.

It brings us great joy to share with you the wonderful and innovative entries we received for the contest. It was not an easy task choosing between them, especially since we had to add an extra set of resources due to the sheer number of responses that we received, but we’re finally here with the list! Below is a glimpse of some of them. Check out the entries below and let us know what you think!

All the winners will win collective cash prizes worth $2400, internship interview opportunities at CodeChef, t-shirts and more as mentioned on the contest page.

On to the winners!

1) Chef’s Arena (unsigned_joy)

Team Members:
Alfarhan Zahedi (alfarhanzahedi)
Jatin Pandey (jatinpandey)

Chef’s Arena is a web application designed to give programmers a competitive environment while practising problems. It’s a fast and responsive application with many exciting modes of practice to help users perform better in a contest and prepare for prestigious contests like the ICPC.

Forum Link

2) Virtual Contest (poor_villagers)

Team Members:
Hasan (hasan356)
Vishwanath (vishwanath45)

This app lets you play CodeChef contests in a Virtual environment, those who have played virtual contests on Codeforces would be aware of it.

Virtual Contests enables the users to run the past contests in a special mode that would imitate a real competition. It allows users to get the experience of a real contest while competing in a virtual environment.

Forum Link

3) Virtualizer (sd_1998)

Team Members
Heramb Patil (herambpatil98)
Jugal Rawlani (fatherofall)

Virtualizer allows users to run past CodeChef contests in an environment that imitates a real competition. Features like real-time successful submissions help a user to identify the difficulty of questions. Virtualizer also provides a user with their overall global, country and organization rank and many more features.

The developers have also included an option to create a custom contest which would consist of questions of various difficulty based on the analysis of the type of questions attempted by a user. They have currently included all the past LTIME and COOKOFF contest. They will be extending this feature to include past ICPC regional contests.

Forum Link

4) CodeChef Social (chhole_bhature)

Team Members
Tanmay Datta (tanmaydatta)
Haider Ali (scoobybutter)

Features:
Available on both iOS and Android
Friends – Add/remove/update friend sets .
News feed – Content info and friends activity .
Chat – Real time chat with any CodeChef Social user.
Notifications – Reminders and live contest submissions of friends in live contest via push notifications .
Contest list – Contest page with list of problems .
Tags – Get all the tags and all problems under any given tag .
Todos – Add/remove/update todos .
User profile pages – Easy access to profile of any user .
Compare – Compare profiles of any 2 CodeChef users .
Ratings – Access ratings of any user, in any contest type .
Problems – View the problem statements anywhere anytime (rendered perfectly) .
Submissions – View submissions by friends right in your mobile .

Forum Link

5) Chef’s Tools (fmot_a_rthur)

The app makes possible to run virtual participations in CodeChef and test in CodeChef cloud through terminal

6) Chef On Phone (binaryhackers)

Team Members
Pushkar Anand (pushkaranand)
Adith A Danthi (adith_danthi)

The app allows using CodeChef on your phone. Using this app you can see ongoing contests, future contests, contest problems, practice problems, read problem statements and solve the problems in the IDE built-in inside the app. You can also set reminders for upcoming contests. Download the code from the IDE to make submissions on CodeChef. This will help users to use CodeChef while on the move.

Forum Link

7) CodeChef CLI (epic_shit)

Team Members
Mrigank Krishan (mrigank11)
Vishnunarayan K. I. (z3r0_)

A CLI frontend for CodeChef. Everyone who is a programmer will be closer to a terminal than a web browser. The vim people won’t even like a web browser open when they are solving problems. This application aims to fix that. And fix it will it do.

8 ) Chef-CLI (dilbardilbar)

Team Members
Abhey Rana (uselesscoder1)
Mohit Khare (mkfeuhrer)

Chef-CLI is a command line interface which uses CodeChef’s official API. This application is for those who hate graphical applications and love to do everything through the terminal. With features like sample submit and problem recommendation, It is designed to improve the overall productivity of the user.

Forum Link

8 ) Question Tagger (lhash)

Team Members
Soumya (himanish)

Question Tagger is a multipurpose web app that one can use to tag and analyse their questions.

The key features of the web app are as follows:

-Tag questions – you can tag questions for your reference, so that you can practice questions of a particular tag later for improvement.
-Analyse tags – View all questions along with their submission status of the selected tag to gain insights of your ACs(accepted), WAs(wrong answer), TLEs(time limit exceeded), CTEs(compile time errors) and RTEs(run time error).
-Test generator – You can mark questions for improvement and can later create a practice test out of the questions available for improvement.
-View submission status of questions submitted during the mock test

Forum Link

We’re working on how we can make these apps available to the entire community and integrating them with our platform wherever possible. We’d like to thank you all for making our first Hackathon such a success. We’re looking forward to many such events in the future

Good luck and happy coding!
Team CodeChef