题目内容
If you can't find anything about a (A) on the Web or through other research, you might not want to trust the campaign. In fact, if it (B) too much personal information,(C) — this is a common feature of (D) or (E) websites and emails.
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One (A) of online charities is that their message can spread at (B). On its first day, FreeRice (C) just over 800(D) of rice. ...The site(E) viral as a result of word of mouth and social networking.
将一棵有50个结点的完全二叉树从根这一层开始,每一层上从左到右依次对结点进行编号,根结点的编号为1,则编号为20的结点的右孩子编号为( )。
设二叉树中叶结点个数为n0，度为2的结点数为n2，则n0和n2的关系是( )。
具有n(n>0)个结点的完全二叉树的深度为 。
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