Hello codeforces

We are happy to invite you to participate in SCPC Teens 2025 that was held on the 25th of September in Latakia, Syria.

The problems were authored and prepared by: EyadBT, Grizoo, Go8, Guess.Who, at2c, Hosen_ba, KactusJack , THE_THUNDERSTORM_BEGINS and me.

I would like to thank ApraCadabra, FetFot, Amgad, 3atori, PixelMaster, askeladd., rasoulist, Nadmannov, Buffalocopter and Doraemonn for testing.

We would love to hear your feedback on the problems in the comments section. We hope you have a blast participating in this contest and wish you the best of luck!

Hello everyone

I’m going to the ICPC World Finals in Baku next month, and I’m planning to bring a few small souvenirs from my city, Homs, known as the capital of the Syrian revolution.

I thought it might be meaningful if others attending also bring something small from their cities or countries, so we can exchange souvenirs, meet in person, and talk about where we’re from.

The idea is simple:

• Bring a small item that represents your city or country

• We meet in Baku and exchange

• We talk, share stories, and learn from each other

The souvenir doesn’t have to be expensive — it could be anything with local or cultural value: a traditional item, a coin, a postcard, or even just something symbolic.

If you're coming to the finals and would like to join this idea, please comment or DM me with your name, city, and university. That way, I can know how many souvenirs to bring and we can plan a time to meet in Baku.

See you in Baku!

Hello codeforces !

Since we're approximately a month away from ACPC (Arab and Africa CPC) 2024 , I believe it's a good idea to get to know the participating teams and assess their current levels. It's also a great idea to add them as friends to compete against them virtually in gyms !

If you qualified to ACPC 2024 , please comment :

• Country

• University (or teens )

• Team name

• Team handles

for me :

Al-baath university from Syria , team Lik Shaghal and my teammates are Magician_Mathematician and HazemDalati .

Good luck everyone !

Upd : I don't know when exactly the contest is , but it must be after 1 or 2 months.

Hello codeforces

I noticed that there isn't a Goodbye 2023: 2024 is near contest in the upcoming rounds , this anual contests is always a nice one , so is it cancelled this year or just not anounced yet ?

MikeMirzayanov

Ramadan mubarak to all my muslim brothers , hope you have a good month and good fasting and prayers !

Hi codeforces

I was solving this problem:
You are given an undirected graph consisting of n vertices and n edges. It is guaranteed that the given graph is connected (i. e. it is possible to reach any vertex from any other vertex) and there are no self-loops and multiple edges in the graph.

Your task is to calculate the number of simple paths of length at least 1 in the given graph. Note that paths that differ only by their direction are considered the same (i. e. you have to calculate the number of undirected paths). For example, paths [1,2,3] and [3,2,1] are considered the same.

But I didn't notice that it has n edges (thought it had m edges which is given in the input), but I didn't find an answer better than n^2

so I want to ask , does anybody know a faster solution for the new problem(m edges )

Thanks!

Hello Codeforces!

In the last few weeks(after I saw a round made by Experts and CMs) I thought about authoring some problems , just to have fun with my friends or to submit it to some CP website .

But I found it really hard to find a good idea for a problem which isn't the same or like some problem I solved before .

So I just want to ask high-rated coders and problem setters , are there some steps you follow when you want to make a new problems ?

Do you for example set some algorithm or topic before starting or just think for some problem then solve it

Thanks !

As 2022 is coming to an end , there is no more time to achieve the goals we wanted in it .

So what are the goals you put before 2022 and you achieved , and what goals remain to 2023 to happen ?

For me the goals I didn't manage to achieve and I hope to make them true in 2023:

• Qualify to IOI 2022 : I was the 5th in the deciding contest and only top 4 go to IOI ): hope i make it to IOI 2023

• Reach CM: didn't happen but I was near

• Go to ACPC teens : I couldn't participate in the first round

Goals I managed to achieve :

• Qualified to IIOT 2022 and got a bronze medal

Looking forward to reading yours !

Anyway , Happy New Year to you all and I hope you achieve all your dreams in 2023!

Hi codeforces

Today I found out that my solution for problem C last contest is skipped due to similarity with some other people , and this is really annoying because I am not a cheater

The code is really simple ( here is mine 180626136 ) and that's why any person.with the same idea will have a similar code Here is the code which skipped me 180640624

I didn't share my code with any person and I didn't use ideone or any other online compiler

You can look in my account and see that I was never a cheater and I am a person who wants to improve and doesn't really care about the rating

CODEFORCES was and always will be a fair place , but it's not fair that I get a skipped and some people who really cheat don't get it

That's why I ask MikeMirzayanov for help and to get my rating back

Or at least remove the skipped because I am not a cheater

Hello codeforces!

About 10 months ago,I reached Expert after two years of practicing (well , I wasn't really practicing then )

But since being an expert , I nearly didn't miss a contest unless I wasn't able to participate , but I'm still going up and down in expert (and sometimes specialist too) , and I reached a rate more than 1800 only once, although I have some contests with a master performance.

And unfortunately, I accepted Ali_ZaiBug 's challenge that if i don't reach purple before the first of November(which is very soon) , he will upload a post on facebook laughing on me ):

Well, I don't really care about the post, but I want to reach purple before 2023.

So can I have some advices please ?

Thanks !