Useful Resources

Virtual Judges

Here you have some good judges:

• UVA  http://uva.onlinejudge.org/  For this judge a great tool is http://uhunt.felix-halim.net/id/98840
• Codeforces http://codeforces.ru/
• Topcoder http://www.topcoder.com/
• Ahmed Aly http://www.a2oj.com/

We can set our own contests and train in groups here:

• Ahmed Aly http://www.a2oj.com/

Training Material

• Here we have visualization of many algorithms http://www.comp.nus.edu.sg/~stevenha/visualization/ .
• Competitive programming book First edition it is free, and we can chek many snippets code for various algorithms  https://sites.google.com/site/stevenhalim/
• Papadimitriu Algorithms book it is free too http://beust.com/algorithms.pdf