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那个树上的点都是有序的一个个这样下来的吗??还是不一定的,有这样的情况吗?

Posted by 5438 at 2009-02-24 22:11:29 on Problem 3719
     1
    / \
   4   5
  / \
 2   3

会有这样的数据吗??

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