Wilujeng Wengi, Codeforces!

We are excited to invite you to TOKI Regular Open Contest #43 (based on Arkavidia 10.0)!

Key details:

• Contest link: TLX
• Time: 8th February 2026, 21:15 UTC+7
• Writer: FaqihMSY, KindaNameless, AldyPy, Valz05, akunorangganteng, bakwankrispi
• Duration: 2 hours 15 minutes
• Problems: 8
• Allowed languages: C, C++11, C++17, Pascal, Java, Python 3, Go
• Scoring distribution: 100 — 200 — 400 — 500 — 600 — 700 — 800 — 800

Many thanks to:

• Pyqe for helping coordinate the TROC contest
• aufannn, Romy67, Wibo, Jteh for testing the problems and giving feedback.
• fushar for the TLX platform.
• Bandung Institute of Technology, all the local committees, administrators, and managers of the whole Arkavidia 10.0 event.

Arkavidia is an annual event hosted by Bandung Institute of Technology. It is one of the largest student-run IT events in Indonesia and competitive programming contest is one of the competitions hosted.

Please register for the contest and we encourage you to read all problems!

Mugia sukses tur bungah!

UPD1: Contest time has been rescheduled due to a clash with ARC214.

UPD2: The contest is over!

Congratulations to our top 5!

1. maspy

2. Rubikun

3. tute7627

4. hitonanode

5. kotatsugame

Congratulations to our first solvers!

• A: hitonanode

• B: Rubikun

• C: hitonanode

• D: hitonanode

• E: hitonanode

• F: Rubikun

• G: potato167

• H: maspy

You can upsolve the problems here. Editorials are available in the upsolve link!

Thank you for participating! See you on the next contest!

UPD3: It turns out that some tests in problem E didn't satisfy the problem's input constraints. However, even though 2 people were affected by this, the effect on the overall scoreboard is very small. Although not ideal, we decided to fix the incorrect tests, rejudge all submissions after the contest, and adjust the new rating changes, keeping the contest rated. We're very sorry for the inconvenience.