Practicing ACM-ICPC Contest problems

I. Most well-known public sites in China
(Suggested by Liu ChunYing of HangDien University):
北京大学（PKU）：http://acm.pku.edu.cn/JudgeOnline/
杭州电子科技大学(HDU)：http://acm.hdu.edu.cn/
天津大学（TJU）：http://acm.tju.edu.cn/toj/
浙江大学（ZJU）：http://acm.zju.edu.cn/
武汉大学（WHU）：http://acm.whu.edu.cn/oak/
哈尔滨工业大学（HIT）：http://acm.hit.edu.cn/
福州大学（FZU）：http://acm.fzu.edu.cn/

II. Most well-known public sites in Europe
(Suggested by Carlos M. Casas Cuadrado who
collaborates with University of Valladolid):
Valladolid Online Judge (Spain): http://uva.onlinejudge.org/
Saratov State University (Russia): http://acm.sgu.ru/status.php
Timus Online Judge (Russia): http://acm.timus.ru/
Sphere Online Judge (Poland): http://www.spoj.pl/
High School Programming League (Poland): http://hs.spoj.pl/
ACM-ICPC Live Archive (Cuadrado & Revilla):
http://cii-judge.baylor.edu/

III. Taiwan Online Judge:
http://gpe.acm-icpc.tw/    
IV. ACM-ICPC World Finals Problems :
Year 2012:
Other Years:
http://cm.baylor.edu/ICPCWiki/Wiki.jsp?page=Problem%20Resources/