Ashishgup's blog

By Ashishgup, 6 days ago, In English

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:

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

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By Ashishgup, 6 weeks ago, In English

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:

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 kefaa2 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.

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By Ashishgup, history, 2 months ago, In English

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:

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

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By Ashishgup, 2 months ago, In English

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:

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.com/blog/entry/15866

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By Ashishgup, 2 months ago, In English

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:

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.

Ranklist 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.

Ranklist 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.

Ranklist 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

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By Ashishgup, 3 months ago, In English

Hi Codeforces,

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

Contest Details

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

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:

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.

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By Ashishgup, 3 months ago, In English

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:

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.

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By Ashishgup, 3 months ago, In English

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

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By Ashishgup, 4 months ago, In English

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:

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!

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By Ashishgup, 5 months ago, In English

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:

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!

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By Ashishgup, 7 months ago, In English

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:

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.

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By Ashishgup, history, 8 months ago, In English

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:

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!

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By Ashishgup, 9 months ago, In English

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:

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.

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By Ashishgup, 9 months ago, In English

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:

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.

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By Ashishgup, history, 10 months ago, In English

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.

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By Ashishgup, 10 months ago, In English

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:

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!

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By Ashishgup, 11 months ago, In English

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:

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 contest.admin2@codechef.com for Lunchtimes and to contest.admin3@codechef.com for Cook-Offs.

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By Ashishgup, 11 months ago, In English

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:

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. 221
  3. afterall
  4. Khas_Profit_LLC
  5. imzzy

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By Ashishgup, 16 months ago, In English

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:

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

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By Ashishgup, 17 months ago, In English

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:

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

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By Ashishgup, 17 months ago, In English

Hi everyone!

I would like to invite you to my fourth Codeforces Round, which I have made with my friends FastestFinger and TheOneYouWant. In terms of problems, it is my favorite among all my rounds.

With that said, I bring to your attention our new Codeforces Round #646 (Div. 2) that will take place on May/31/2020 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:

You will be given 6 problems and 2 hours to solve them. Scoring distribution will be announced later.

Good luck! :D

UPD: Scoring Distribution: $$$500-1000-1500-2000-2250-3000$$$

UPD2: Editorial (with memes, and detailed explanation) — Hope you guys enjoyed the contest! :D

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By Ashishgup, history, 3 years ago, In English

I hope you guys enjoyed the contest and we hope to host another one soon! The next one will be more balanced :P

With that said, here are the tutorials:

Tutorial is loading...

Author: Ashishgup

C++ Code: 51651509

Java Code: 51651164

Tutorial is loading...

Author: Ashishgup

C++ Code: 51651887

Java Code: 51651375

Tutorial is loading...

Author: Ashishgup

C++ Code: 51652029

Java Code: 51651756

Tutorial is loading...

Author: Vivek1998299

C++ Code (Above Logic): 51652491

C++ Code (Mobius Inversion): 51652104

Tutorial is loading...

Author: Jeel_Vaishnav

Java Code: 51652167

Tutorial is loading...

Author: Jeel_Vaishnav

Java Code: 51652020

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By Ashishgup, history, 3 years ago, In English

Hello everyone!

I would like to invite you to participate in HackerEarth's February Easy '19. The contest will be held on 1st February, 2019 at 21:00 IST

The problems have been prepared by me (Ashishgup) and Jeel_Vaishnav. We would like to thank TooDumbToWin for testing the round and trytolearn for giving us the opportunity to hold the contest.

You will be given 6 algorithmic questions to solve in 3 hours. Partial scoring will be used (you get points for passing each test case). Although the contest is targeted towards beginners, we hope that everyone finds the tasks interesting. The contest is rated for all and prizes will be awarded to the top 3 beginners (i.e. programmers with a rating of 1600 or less before the challenge starts):

  • First place: $75 Amazon gift card.
  • Second place: $50 Amazon gift card.
  • Third place: $25 Amazon gift card.

Good luck and have fun!

UPD: The contest begins in 15 minutes.

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By Ashishgup, history, 3 years ago, In English

Creating this blog for discussion of problems/solutions from Indian ICPC Regionals

Onsite Contest Standings:

Online Replay Contests:

There is also the whole issue with test cases in the regionals so far:

Gwalior-Pune:

  • "Flipping Polygons" had wrong TCs which affected a few teams, with 3 of them getting AC later. Converting WA -> AC after contest is alright, but the time wasted by teams in trying to correct their codes could have been utilized in solving a different question.
  • "Three Strings" had really weak TCs, considering that solutions taking max prefix and max suffix only get AC as well. (Breaking test case: 1 abc cde bcde)

Kolkata-Kanpur:

  • "Chef and Alien Invasion" again had wrong TCs, and teams were affected, with even the teams qualifying for World Finals changing places. ACs were converted to WAs after the contest (although that doesn't affect the ranks), not to mention that it was announced that the problemset for the regional was made 1 day before the contest, which is not what is expected of an ICPC regional.

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By Ashishgup, history, 3 years ago, In English

Hi everyone!

I would like to invite you to my second Codeforces Round, which I have made with my friend and Snackdown partner Jeel_Vaishnav.

With that said, I bring to your attention our new Codeforces Round #523 (Div. 2) that will take place on Nov/22/2018 18:45 (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 Jeel_Vaishnav for his help with preparing problems, cdkrot for coordinating our round and Um_nik, vintage_Vlad_Makeev, Aleks5d, KeyurJain & Mahir83 for testing the problems. I would also like to thank MikeMirzayanov for Codeforces and Polygon platforms.

You will be given 6 problems and 2 hours to solve them. Scoring distribution will be announced later.

Link to My Coding Library for those interested :)

Good luck! :D

UPD: Scoring Distribution: 500-1000-1500-2000-2500-2750

UPD2: Editorial

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