Sphere Online Judge

Sphere Online Judge (SPOJ)
The Sphere Online Judge Problemset SPOJ is a programming site with a collection of selected but wide range of problems. It contains problems of all difficulties covering all the standared and not standared algorithms. Moreover its problemset is increasing as one could post his/her problem.It covers all the problems of the acm contests which is a prestigious contest. Also one could learn a lot solving the problems at spoj

About
The SPOJ Project is developed by the Sphere Interest Group at the Faculty of ETI, Gdansk University of Technology, under the auspices of the Department of Algorithms and System Modeling.