Q&A/AMA stream on Tuesday

#	User	Rating
1	tourist	3985
2	jiangly	3814
3	jqdai0815	3682
4	Benq	3529
5	orzdevinwang	3526
6	ksun48	3517
7	Radewoosh	3410
8	hos.lyric	3399
9	ecnerwala	3392
9	Um_nik	3392

#	User	Contrib.
1	cry	169
2	maomao90	162
2	Um_nik	162
4	atcoder_official	161
5	djm03178	158
6	-is-this-fft-	157
7	adamant	155
8	awoo	154
8	Dominater069	154
10	luogu_official	150

Hello Codeforces!

I will hold a Q&A/AMA stream on Twitch on Tuesday, 21 MSK (UTC+3).
You can write your questions in chat during the stream, or send them in this form beforehand (for example, if you can't attend the stream in person). Recording will be uploaded on YouTube afterwards.
Questions written in Russian will be answered in Russian, questions written in English — in English, questions written in other languages won't be answered because I can't understand them. I won't answer a question if I don't want to. Hopefully, the multilingual nature of the stream will be resolved afterwards by interested people who will add subtitles.
Questions can be about anything, but once again, I won't answer a question if I don't want to.

Huge thanks to lperovskaya who has agreed to help with this.

UPD: I won't answer questions like "how to become red", "how to become better at topic X", "how to win icpc wf". Answer

UPD2: Thanks to those who have come to watch this clownfest, here is the recording, including the last part during which my internet has died.