A very interesting polynomial problem that was longlisted for the IMO!
24:20
Too hard for the IMO? Too easy?
17:56
This problem is everywhere!
17:13
A very unfriendly integral problem!
15:21
The Mathematician Forced to Become a Genius
7:27
Solving An Insanely Hard Problem For High School Students
34:54
ABSURD GUESS THE ELO!!!!!
26:32
Can I BEAT Martin's Family?
12:46