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这里用素数筛法，不会内存空间不够么，求高手正解

Posted by shiyimin at 2013-03-15 15:36:51 on Problem 2262 
这里n可能取1000000，如果开mark[1000000]的数组，不会runtime error么。。。
我是用扫描+素数判断AC的。
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