http://acm.hdu.edu.cn/showproblem.php?pid=3411
http://hi.baidu.com/aekdycoin/blog/item/63f633ec11c822d8b21cb168.html
posted on 2011-05-17 00:33 jjtx 阅读(141) 评论(0) 编辑 收藏 举报
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