http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42814#problem/F
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42814#problem/K
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42963#problem/E
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42963#problem/B
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42879#problem/C
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42879#problem/J
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42877#problem/C
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=42877#problem/F
http://125.221.232.253/JudgeOnline/problem.php?id=1610
http://acm.hust.edu.cn/vjudge/contest/contest/view.action?cid=43085#overview
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3777
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3780
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3781
http://acm.fzu.edu.cn/problem.php?pid=2170
http://acm.bnu.edu.cn/bnuoj/contest_show.php?cid=3895#problem/44022
http://acm.bnu.edu.cn/bnuoj/contest_show.php?cid=3907#problem/44255
http://poj.org/problem?id=2762
最近还有什么携程啊,编程之美啊,gcj啊,tco啊,还有cf额,上次的cf都还没弄完!