SPOJ (Sphere Online Judge) isn't very friendly to newbie programmers. It has mostly tough problems which take a lot of time. PKU (Peking University) Judge is more newbie friendly and at the same time has extreme difficulty problems. It has over 7000 problems which promise to never end.
For programmers who have just stepped into this wonderful world of algorithms and programs it would be great if they start from PKU online judge. Is as interactive as sphere in terms of submitting code online and checking the result.
The scoring system is a little tough because your rank would also depend on how many wrong submissions you made which is not the case of sphere. So it would be wise to correctly check everything including even the smallest extra whitespace which is not needed.
It also has more types of error definitions. Example if your solution is correct but your presentation is wrong then it would say so (not in the case of sphere).
Here is the link:
http://acm.pku.edu.cn/JudgeOnline/
Just register and start solving.
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