Hi codeforces!

Last year I got the chance to visit IOI 2025 in Bolivia (together with Kuroba), my first time back at an IOI after 7 years. It was a really fun experience reconnecting with the IOI community, watching the contest, and solving the problems together with all the teams.

This year, the firm I work with, Hudson River Trading, is sponsoring both EGOI and IOI, and some of us will be onsite at EGOI next week and at IOI later this summer. To get warmed up, we were honoured to work with Eljakim Schrijvers from IOI, to make a series of walkthrough videos for some of the IOI 2025 problems, which we'll be releasing over the next few weeks :)

The first video is for Souvenirs, featuring my colleague Katherine Li, who will be at EGOI!

>>> link <<<

Coming soon, is World Map (featuring Kuroba) and Festival (with myself)- stay tuned!

We tried to make these feel less like "here is the official editorial" and more like understanding the actual thought process behind how you arrive at the solution. Hopefully they're useful, whether you're actively training or just watching IOI problems for fun.

More videos coming soon -- good luck to everyone competing at EGOI and IOI this year!