notlikeduck's blog

By notlikeduck, history, 7 months ago, In English

Final update: The contest has finished! This year, since it was prepared using Polygon, it is available for upsolving in the Codeforces gym. Thanks everyone for participating!

And congratulations to the top teams:

Place Team Points Penalty
1 Golovanov399, AndreySergunin, amethyst0 850 177:51
2 hyforces, lunchbox, oursaco 850 179:52
3 GusterGoose27, Ritwin, skittles1412 830 171:40
4 null_awe, PurpleCrayon, penguinhacker 830 178:43
5 antontrygubO_o, 244mhq 800 169:11

Update update: Both the Standard Round 5-day window and CTF Round have started. GOOD LUCK HAVE FUN!!!

Update: The start of the contest has been delayed by 4 hours due to some technical difficulties. You can see the new start time here.

Participants can join our Discord server here

Hey there! LexMACS (Lexington Mathematical Computer Science club) is proud to announce that LIT (Lexington Informatics Tournament) is back for 2023!

LIT is composed of 2 rounds: the standard round and the Capture-The-Flag ( CTF ) Cybersecurity round. The standard round is a USACO-style team contest with 8-10 problems and a 3-hour contest window. Some of our problem-setters and testers include: BucketPotato, rqi, Savior-of-Cross, EmeraldBlock, SuperJ6, eyangch, izhang, czhang2718, fishy15, fivefourthreeone, lookcook, wabadabakalakaboo, eggag32, and codetiger927.

You may create teams of up to 3 members and choose to start either round at any time during our 5-day contest window (August 4th to August 8th). For more info on LIT logistics, visit

Furthermore, we will have over * $20,000 * worth of prizes for teams with superb performances, as well as some secret prizes. ALL participants will receive participation prizes and be entered into prize raffles, and the top 16 contestants will receive Wolfram Alpha Notebook Edition. Top 8 teams from both the standard and CTF rounds will receive cash prizes! We also have cash prizes specific to both college/post-high school and middle school students, along with game night cash prizes! Regardless of your skill level, we promise that the contest will provide something exciting and refreshing!

For more info on LIT prizes, see the "Prizes" section on our homepage.

For more LIT 2023 details, visit our website: !!!!!! Or email us at [email protected].


Sincerely, LexMACS Organizers <3

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By notlikeduck, 19 months ago, In English

Hello Codeforces!

CerealCodes is excited to announce our Summer 2022 Programming Contest!

This contest will be held on August 13-14th on Codeforces (with 4 different start times).

The competition has three divisions: Novice (USACO Bronze-Silver or Div 3), Intermediate (USACO Silver-Gold or Div 2), and Advanced (USACO Gold-Platinum or Div 1).

You can form teams of up to 3 members, and compete to solve ~6 high quality (cereal themed!) problems within 3 hours.

Over $500 in cash (possibly more) will be given out (in the form of Amazon gift cards), as well as other prizes like merchandise and raffle awards!!! Note: only pre-college teams are eligible for cash awards.

Join our Discord server for more info and access to faster communication about our competition.

Visit our website to access more information about our contest.

Special thanks to our problem development team: Apple_Method, wavelets, oursaco, omeganot, aadit.ambadkar, timg8710, Cereal2, cry, ArielShehter, buffering, and GusterGoose27.

Our amazing problem testers: Benq, Tlatoani, null_awe, vrooooom, Ritwin, szhao, nicolexu, br1ck, and cryan..

A huge shout out to BucketPotato for helping review and prepare our problems on Polygon.

A huge thanks to our entire CerealCodes team.

We hope to see you there!

CerealCodes Team


We have decided to relax restrictions on joining the sample contest, so you do not need to solve a problem in the sample contest to be eligible for prizes.

Also, now all you need to do to join the contest is make an account on the CerealCodes website with your team name and team member's names. You can also just join the contest without the above and participate unofficially.

Please join the Codeforces group with your desired contest start time ASAP.

Codeforces Group Links:

Start Time 1: Saturday, August 13, 10 AM EST

Start Time 2: Saturday, August 13, 4 PM EST

Start Time 3: Sunday, August 14, 10 AM EST

Start Time 4: Sunday, August 14, 4 PM EST

We hope you enjoy the problems!

CerealCodes Team


With the contest date approaching soon, we would like to update you with more information about the contest logistics, as some details may be unclear at the moment.

Please take a look at This contains all the information you will need to know about our contest, including the sample contest we are hosting, and how to participate in the contest on Codeforces.

We will be updating registration shortly to allow you to securely enter the Codeforces group with your appropriate start time. Under registration, we require you to provide each team member's name, Codeforces handle, and your designated start time. You MUST register your account by August 12th at 9:00 PM EST with each component of registration finalized. You may not switch your start time or update your profile after that hard deadline.

We will also be hosting an opening ceremony on August 12 at 7:00 PM EST via Zoom, where we will be describing the contest logistics in further detail with prizes, raffles, and contest rules described. We will also have our guest speaker Charlie Guo from XCamp give a five-minute talk during our opening ceremony.


Please update your profiles, so that we can manually accept you to the CF contest groups based on your selected start time. This is ABSOLUTELY necessary to complete if you want to compete in the contest.

Additionally, please join the sample contest group, since you will only be eligible for prizes and raffles if you submit an accepted solution in both the sample contest and the actual contest. No worries, the sample contest is super easy to do (just solve A+B if you don't have time to do the other problems).

The sample contest group can be found here.

We are really excited to welcome you to our first-ever contest, and we hope that you have fun!

CerealCodes Team


Unfortunately, there was a bug for some people which made them not be able to save their profile information on the website. This problem has been resolved and it should be working now. Sorry for the inconvenience.

Make sure to add your team member information, start time, etc on your website profile by logging in here.

See you soon!

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By notlikeduck, history, 21 month(s) ago, In English


The Bay Area Programming Contest, a programming contest for precollege students, will be held on June 12 from 10 am to 2 pm PDT. Note that the contest has been pushed back by 1 hour to avoid colliding with Educational Round 130. You can check the converted time here. If you are not a precollege student, you can participate, but you will not be eligible for prizes.

The problems were created by EndlessVoid, GusterGoose27, pocafup, lce4113, and NightWizard777. Problem preparation was done by BucketPotato. Additional thanks to eggag32 and izhang for testing the problems.


The contest will be conducted through our Codeforces group. Only those who fill out the registration form will be let in.

The contest will be $$$4$$$ hours long. Scoring will be regular ICPC rules (your score is based on the number of problems you solve with ties broken by time penalty, each wrong submission counts as a $$$20$$$ minute penalty). We have tried to sort problems by difficulty in both rounds, but remember to still read all the problems.

There will be a novice round and an advanced round. The novice contest is expected to have interesting problems for up to Div. 3 level contestants. All other contestants are encouraged to participate in the advanced round.

You can find the registration form and the contest rules on the website.

For more information, please join our Discord server or visit our website.


We have the following prizes for precollege contestants only:

Place Novice Advanced
1st TI-Nspire CX Student Software and Wolfram Subscription* TI-Nspire CX II Graphing Calculators and Wolfram Subscription*
2nd TI-Nspire CX Student Software and Wolfram Subscription* TI-Nspire CX II Graphing Calculators and Wolfram Subscription*
3rd Wolfram Subscription* Wolfram Subscription* and $25 AOPS Coupons
4th Wolfram Subscription* Wolfram Subscription* and $25 AOPS Coupons
5th $25 AOPS Coupons Wolfram Subscription*
6th $25 AOPS Coupons Wolfram Subscription*
7th Wolfram Subscription*
8th Wolfram Subscription*

*This award is for a year of Wolfram|One Personal Edition plus a one-year subscription to Wolfram|Alpha Pro.

Good luck, have fun, and we hope to see you on the leaderboard!

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By notlikeduck, history, 3 years ago, In English

A few weeks ago, I reached Expert on my 4th contest and found a new button on the sidebar: "Propose a contest/problems." I didn't think much of it, until I talked to my friends about this. One of them did not see this button until they reached CM and their 17th contest.

I searched around and found these two blogs on the topic:

How to set a round on Codeforces and For contest writers: proposal tracking system

It seems like these blogs have not been updated in a while, and I haven't found more recent blogs answering my questions. So, I would like to know:

  1. What is the exact requirement for this button to appear, and why does it seem to be different for different people?

  2. The requirement seems to have changed since these blogs were made, but I did not see any updates on the blog posts. Where are these changes being publicized?

Thank you in advance for the information!

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