http://acm.hust.edu.cn/vjudge/contest/view.action?cid=23210#problem/C
http://acm.hust.edu.cn/vjudge/contest/view.action?cid=23137#problem/B
posted on 2013-05-05 20:02 Fray 阅读(105) 评论(0) 编辑 收藏 举报
