Dynamic scoreboard of IOI 2023 can be seen through this link.

Dynamic scoreboard of OSN (Indonesian NOI) 2023 can be seen through this link.

Thanks to fushar for granting me access to the submissions of OSN 2023.

All available dynamic scoreboards (IOI, APIO, and OSN) can be seen through this link.

Any comments and improvements are welcomed.

Inspired by IOI Contest Footage in this blog, I also try to add APIO Contest Footage.

Watch the contest footage here :

• APIO 2020
• APIO 2022

New features :

• Toggle between virtual time (5 hours) and actual time (2 days)
• Show and hide unofficial participants

Any comment or advice would be appreciated.

Want to see your progress in past IOI or KSN (Indonesian NOI)? Wish to rewind the live scoreboard?

Watch the contest footage here :

• IOI 2022
• IOI 2021
• IOI 2020
• IOI 2019
• KSN 2021
• KSN 2020

Features :

• Time slider
• Play and pause button
• Show and hide medal range
• Show and hide unofficial participants
• Ranking based on specific day or problem
• Mark some specific contestants
• Accuracy 99%

Here an example screenshot of the page :

I decide to open the source code on GitHub :

• All contests

We can deploy it even in AWS S3 Bucket since it is a static web. Any pull request for adding more features or fixing some issues are welcome.

I hope you enjoy the contestants' dramatic performances.

UPD 1: Adding Contest Footage of KSN.

UPD 2: Replacing new link for KSN Footage.

UPD 3: Add toggle button for unofficial participants.

Actually, this contest ended 2 months ago and you can upsolve here. But, because someone complained me about editorial of this problem yesterday and said that it was hard to understand. And also until I write this blog, just Benq and Pyqe that already submit (and both of them got AC). So, I try to rewrite a clearer explanation about this problem in this link (english version is available on page 8).

Additional :

By the way, I got an idea about this problem more than 3 years ago when I was in junior high school even before I know about cp. Finally, it is published after several years of waiting.

I wonder, what is the percentage of ioi 2019 contestant that attempt problem line without any randomization?

What is the largest number less than 2^64 which has exactly 90 positive divisors ?