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2 1 3 1 4 1 是不是树？？？没有方向？？

Posted by fff123 at 2011-04-07 15:33:47 on Problem 1308 and last updated at 2011-04-07 15:36:45 
谁告诉我啊。。。。2 1 3 1 4 1  是不是树？？？？？？？？？？？
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