This is the unofficial editorial to KSN 2020 (Indonesia's National Olympiad in Informatics), more information about the contest can be found on this blog post.

You can read the editorial here.

We decided to make this editorial for two reasons:

1. The editorial is usually only available in Indonesian, so we decided to write it for the international community.
2. The contest was held 3 months ago, but the Scientific Committee's editorial is still not released yet.

I would like to thank prabowo, tzaph_, Pa.Nic, nightlight, and rama_pang for helping to finish up this long overdue editorial.

Any issues with the editorial written can be asked here. We will try to respond when we are available.

Thank you and hope this could be useful!

UPD: Regarding problem 2C, the scores are always rounded down as can be seen from the given scoring formula.

Dear Codeforces community,

We are excited to invite you to TOKI Regular Open Contest #16!

Key details:

• Rated for all
• Contest link: TLX (combined divisions)
• Time: 22 November 2020, 14:05 UTC
• Writers: rama_pang Pyqe Berted DystoriaX
• Duration: 2 hours
• Problems: 7

Scoring distribution: 100 — 200 — 350 — 450 — 500 — 550 — 850

Finally, we would like to thank:

• prabowo for coordinating the contest.
• hocky for helping with problem preparation.
• JulianFernando and AMnu for testing the problems.
• fushar for the TLX platform.

Please register to the contest, and we hope you will enjoy the contest!

UPD: Contest is over!

Congratulations to our top 10:

1. satashun
2. wiwitrifai
3. hitonanode
4. awoo
5. kotatsugame
6. Merripium
7. LayCurse
8. tfg
9. tute7627
10. nuip

Congratulations to our first solvers:

• A: bukanYohandi
• B: Savior-of-Cross
• C: kotatsugame
• D: neal
• E: kotatsugame
• F: tfg

Editorial is available here. (English version is available on page 8)

You can upsolve the problems here.

Thank you for participating and we hope to see you on the next contest!