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烂题 简直是没有最多trick ,只有更多trick

Posted by duticpc at 2009-08-14 22:39:46 on Problem 3511 and last updated at 2009-08-15 09:17:21 
trick 1:有负数输入，当且仅当L,U均为-1时退出
trick 2:2也是符合条件的素数
trick 3:没有负素数
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