Hello Codeforces
I am glad to invite you to take part in my contest. The round will be in ICPC style, but penalty won't count (if your solution is skipped, don't worry, I skip WA submissions to not count penalty). Note that problem K is supposed to be the last problem, but I am too lazy to change :). You can expect the difficulty of these problems to be Div. 4.
You will be given 13 problems to solve. It will start at Friday, January 9, 2026 at 22:15 (UCT+7) and ends at Friday, January 16, 2026 at 22:15 (UCT+7).
All the problems are authored my Mitpro
I would like to thank:
zeyd1234 for giving me the idea to do this
Mitpro for testing
Mitpro for finding edge cases
You for participating.
I hope you will enjoy the round and the problems!
This contest has already been made, but I decided to do make it become contest.
UPD1: Why do most of you register and do not solve the problems :(. I really want many people to solve it because I put a lot of time in the problems.
UPD2: Who ever gets top 10 after the contest ends will get a shout out, who ever gets top 5 will have the option to be co-author next round!
UPD3: Who ever gets top 15 after the contest ends will get have the option to be tester next round!
UPD4: Congratulations to the winners!
Good contest. The tasks are soo cool.
Congrats, Div. 4 for CM :)
Good contest. Excellent problems. But I still don't understand why they added K, M — Maximum Flow and Manaker +DSU to the problems. I would classify K, M as div 3.
My solution for M is greedy, you don't even need DSU! But yes, K is mainly data structure, which is not what I want, because you have to learn the algorithm, and I don't want the problem to be a knowledge wall
K is the most standard matching problem so it's not suitable for CF...
problem H :
There are n − 1 pipesalso problem H :
wants to go to pipe nFixed!
Great contest I enjoyed it
K,J,M were nice F was just pure implementation (why)
Good contest overall
Sorry for F, even the solution was wrong T-T
Has it been fixed now
Yes, the solution for F has been fixed, all submissions have been rejudged
In F shouldn't it be $$$0 \le |m_i| \le 10^5$$$ instead of $$$1 \le |m_i| \le 10^5$$$
Oh, yes, sorry, my bad. I will fix it right now.
Next time, if you want to ask a question, ask in the contest page
Very Good Contest :)
MisterGir
am_aadvik
WA_ON_TEST_2
rpam
bramar2
DigiTalDreamar
wtf.rjdp1
Zeeshan-Haider-Alvi
kamyak
Kalevion
sqrteipi
ShapeBlaze
potatoArmy
pandaa73
TEAM LGM: MShaheer and Faraz
Who ever wants to become tester, DM me on my CF account, send me your discord account, I will send you the group invitation to my discord group for testers!
PLEASE DM ME YOUR DISCORD NAME SO I CAN ADD FRIEND YOU