Screencast & Editorial of A–F in CodeTON Round 6 (Div. 1 + Div. 2)

#	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	170
2	maomao90	162
2	Um_nik	162
4	atcoder_official	160
5	djm03178	158
5	-is-this-fft-	158
7	adamant	154
7	Dominater069	154
9	awoo	153
10	luogu_official	152

Today a horrible thing almost happened: I barely stayed an International Grandmaster on Codeforces after participation in CodeTON Round 6 (Div. 1 + Div. 2, Rated, Prizes!). I would't say I was exceptionally slow or that I solved problems too clumsily, but for some reason the majority of participants near my level were faster than me on these problems.

I recorded a five hour long video about my adventures. If you're interested in a particular problem, follow the timecodes:

Problem	Solving	Implementation	Editorial
1870A - МЕХанизированный массив	01:37	02:45	3:23:28
1870B - Дружные массивы	06:23	10:54	3:30:20
1870C - Разноцветная таблица	12:48	14:12	3:41:00
1870D - Покупка префиксов	22:14	24:41	3:58:20
1870E - Очередная задача на MEX	39:37	58:42	4:34:24
1870F - Ленивые числа	1:31:03	2:54:32	2:30:37

If you open a video and see it's low quality, you might want to wait several minutes until YouTube processes the higher resolutions.

UPD. This is high quality now. Please watch!

orz's blog