Hi, I'm back to streaming :)
In particular, I'm going live in 20 minutes. You can watch on Twitch or Youtube. The recording will remain available on YT.
June
- recording 27.06 — Linux & Geany setup
- recording 28.06 — short test stream, solving 1-2 problems
- recording 29.06 — div2 problems
- recording 30.06 — div1 problems
July
- recording 6.07 — (easy) div2 problems
- recording 7.07 — (hard) 2119D - Token Removing and EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2) C-E
- recording 8.07 — (easy) Codeforces Round 1034 (Div. 3)
- recording 10.07 15:00 CEST — (hard) ARC201 A-D
- recording 11.07 15:00 CEST — (easy) ABC413
- recording Saturday 12.07 11:00 CEST — CSES Introductory Problems (educational stream with detailed explanations)
- recording Sunday 13.07 11:00 CEST — CSES Introductory Problems, part II (educational stream with detailed explanations)
- recording Tuesday 15.07 15:00 CEST — (hard) problems C, E, F from Codeforces Round 1035 (Div. 2)
- Wednesday 16.07 15:00 CEST — (easy) div2 problems, last stream before the Huawei IOI Camp
Just like last year, I'm going to organize paid group classes around July-August, and a free IOI camp sponsored by Huawei. I will announce more details soon.
As an experiment, you can also book a 50€ Google Meet call with me https://calendly.com/errichto. For example, we can discuss your training strategy or just talk about life.
i really need to talk with you about my life
Will the ioi camp be organized before this years ioi?
Yes, I think that the dates will be 17-23.07.2025.
I will put an announcement tomorrow.
Omg Errichto is back ! Lets gooo
will you marry me ?
will there be more streams or is it over by tuesday?
Let's solve some AtCoder problems tomorrow :)
See you tomorrow (Saturday 12.07) at 11:00 CEST for CSES Introductory Problems. I will cover dp or geometry problems next.
Generally, I'm just solving problems on weekdays (ofc. not every day) and I will stick to the starting time of 15:00 CEST. I will try to make educational topic streams/lectures on weekends (timing might vary).
Also, here's a timestamp link to a solution summary for 2119D - Token Removing. People complained that the editorial isn't very clear — and I think that the visual explanation is useful here.
We discussed the first half of Introductory Problems (up to "Palindrome Reorder"). recording
The next stream will be same time tomorrow, I will continue from "Gray Code" problem.
I really enjoy your streams — they’ve helped me a lot in improving my thinking.
I'm done with CSES Introductory Problems. I think that I explained everything in detail — which is why the two streams took 6 hours in total. All codes: https://github.com/Errichto/youtube/tree/master/CSES
What should I do next? Topics streams covering Usaco Guide Gold/Plat? CSES DP? Maybe the new problems in CSES Geometry (as I solved old ones in a stream a few years ago).
i think u should start with dp queastion and do a speed run i have some doubts on the DP queastion Mountain Range -> https://cses.fi/problemset/task/3314 Increasing Subsequence -> https://cses.fi/problemset/task/1145 i want to know you approch and ur thinking
also i have a personal requeast to make can u make or do a small stream for graph queastion beginner-intermediate edition such that it is pices of cake for us to solve graph problems from cses queastion or any interveiw think you
Thanks for suggestions.
But either it's a speedrun or it's a slower stream with detailed explanations. You can't have both ;p
IOI 2025 day 1 stream: https://youtube.com/live/iRyOxI86UOs & https://www.twitch.tv/errichto
I'm going live in 20 minutes to check out the problems from IOI day 2. It will be a short stream as I want to finish before peltorator starts his segment tree lecture stream.
Also, this is the last day with 12% off for my CF problem-solving classes with discount code IOI.
I will cover CSES Dynamic Programming this weekend, first stream on Saturday (tomorrow 12:00 CEST).
Recording of first 9 problems (until Counting Towers) https://www.youtube.com/live/1UTXTrTALlo?si=aFkgWaGZsV2_m4oq
See you today at 14:30 CEST for second part. The stream will be 2 hours long and will end just when the CF div3 round starts.
when is the part 3 coming @Errichto ?