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这题好难阿！！！ http://acm.buaa.edu.cn/oj/problem_show.php?c=0&p=1157

Posted by barnabas at 2007-10-01 21:28:31
In Reply To:庆国庆，迎接党的十七大，北航OJ正式发布：http://acm.buaa.edu.cn/ Posted by:lqs at 2007-10-01 16:18:42 
老是不过！
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