Hello, Codeforces! 😍😍

We are happy to invite you to participate in COMPFEST 15 Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) on . COMPFEST is a national ICPC-style contest for university students in Indonesia.

The problems are written and prepared by ArvinCiu, asteriskzie, CyberSleeper, Edbert.H, FreeJinG, gansixeneh, KokiCoder, nandonathaniel, and Pyqe.

We would also like to thank:

• KAN for helping to host the mirror round;
• AMnu, (KerakTelor, Owmicron, ZeroScar), (yz_, Berted, Elben85), errorgorn, Drew_, and joelgun14 for testing the contest and providing us very useful feedback;
• Universitas Indonesia, all the local committees, administrators, and managers of the whole COMPFEST event;
• fushar for the Judgels platform used in the official contest; and finally
• MikeMirzayanov for the amazing Codeforces and Polygon platform!

The contest will last for 5 hours and consist of 13 problems. The statements will only be available in English. While it is preferred to participate in a team, individual participation is also allowed.

COMPFEST itself is an annual event hosted by Universitas Indonesia. It is the largest student-run IT event in Indonesia and competitive programming contest is one of the competitions hosted.

We hope you will enjoy and have fun in the contest. Good luck! 🔥🔥🔥🔥

UPD: Contest is over!

Congratulations for our first solvers!

• A: arvindf232
• B: maspy
• C: (Speed Star: noimi, SSRS_)
• D: (ITMO PTU: dimss, Kirkon, andreyDagger)
• E: Morphymorphymorphy
• F: (JoesSR fan club: red-stone, LXH-cat, wsyear)
• G: (DELIAIR: sapphire15, tokusakurai, torisasami)
• H: (Hamood? Hamood!: qiuzx, njwrz, sjcsjcsjc)
• I: (absinthe: user202729_, nvmdava, rama_pang)
• J: (Beyond Three Wolves: Yapparimurideshita, Kevin114514, Atomic-Jellyfish)
• K: (致远星: AlternatingCurrent, PersistentLife, grass8sheep)
• L: (Team named after Elena Engurazova: otsekai, oversolver, Blinov_Artemii)
• M: hos.lyric

Editorial is available here!