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:
|1870A - MEXanized Array||01:37||02:45||3:23:28|
|1870B - Friendly Arrays||06:23||10:54||3:30:20|
|1870C - Colorful Table||12:48||14:12||3:41:00|
|1870D - Prefix Purchase||22:14||24:41||3:58:20|
|1870E - Another MEX Problem||39:37||58:42||4:34:24|
|1870F - Lazy Numbers||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!