I sort of looked at the last Spotify Programming Challange, and found the stuff pretty difficult.
Anybody have some resources to practice on this sort of stuff?
Do you have a link to the previous problem set?
If you sign up you get access to last years website.
I'm kind of curious why non-Europeans (such as myself) are barred from participating.
They're looking for EU-based talent.
Expanding on what tudorachim says, it appears to be an thinly-veiled recruitment exercise. Any EU citizen can work throughout the EU without needing work permits, which is presumably why they have that restriction.
And for that matter many of the similar competitions that have occurred were run by companies who are interested in hiring worldwide, which is why this seems like a special case, I suppose...