Sphere Online Judge (spoj.com)

What is this?

Some of these problems can be incredibly difficult. We used to use these to practice for the ICPC.

Even though Spoj is great, nowadays contest programming people use some other online judges. http://codeforces.com/ and http://www.codechef.com/ are mostly used platforms.

The cool things on spoj:

+ the list programming languages you can use (brainfuck and whitespace are there, — if you're too lazy to check)

+ golfing problems like http://www.spoj.com/ranks/NOP/, you need to minimize your program length

And the one big problem is that they haven't been bothering to update their compilers for a long time

While we are at it, does anyone have a good explanation for the following fact:

o before 1990, the US won every single ACM ICPC contest;

o between 1990-2000 it won 4 times;

o since 2000 it is Russia+China+Poland total domination.

http://en.wikipedia.org/wiki/ACM_International_Collegiate_Pr...

codewars.com is a good alternative also. Currently it supports Clojure, CoffeeScript, Haskell, Java, JavaScript, Python, Ruby and they keep adding new languages according to user votes (Haskell and Java were the latest).