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这个题当年是用笨办法过的，现在重写了一次

Posted by Sempr at 2006-03-07 23:01:28 on Problem 2140 
1051891 Sempr 2140 Accepted 48K 0MS C 0.22K 2006-03-07 22:59:55.0 
887239 Sempr 2140 Accepted 1344K 2105MS Java 0.35K 2005-11-21 13:14:29.0
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