Salam sejahtera, Codeforces!

We are excited to invite you to the mirror of Indonesia National Contest (INC) 2026!

The Indonesia National Contest (INC) is an annual online programming competition that serves as a preliminary and qualifying round for Indonesian teams to advance to the ICPC Asia Jakarta Regional Contest.

Key details:

• Rated for all

• Contest links: TLX

• Time: Sunday, October 25, 2026 at 13:05 UTC

• Duration: 2 hours

• Problems: 6

• Allowed languages: C, C++11, C++17, C++20, Pascal, Java, Python 3, Go, Rust

• Contest style: ICPC

  • Penalty per wrong submission: 10 minutes
  • There will be no scoreboard freeze.

• Available Languages: English, Bahasa Indonesia

We would like to thank:

• Yoshiyuki, Chrisedyong, faustaadp, fushar, HahahaHihihi, Owmicron, prabowo, Pyqe, suhendry, and Zanite as the judges and authors of INC 2026.
• AVM.Martin and ArgoCahaya as the technical committee of INC 2026.
• aufannn, avner.m.lim, bananade1, ByeWorld512, Drakozs, Nevll, piee, rfpermen, SunShine11, takeonicky, Twits, vioalbert, and ZeroScar for testing the problems and giving outstanding feedback.
• fushar for the majestic TLX platform.
• You for participating!

Please register for the contest! We encourage you to read all problems. Enjoy the mirror!

UPD: Contest is over! The preliminary results are out. We are finalizing the results; this might take one to two days.

Congratulations to our top 5:

1. maspy
2. flashmt
3. dewana310
4. Romy67
5. wx03

Congratulations to our first solvers:

A: bramar2
B: maspy
C: maspy
D: maspy
E: maspy
F: maspy

The editorial is available here.

Thank you for participating and see you on the next contest!