Every child has known God, not the God of names, not the God of don'ts, but the God who only knows four words and keeps repeating them, saying,'Come dance with me. Come, dance with me.'
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题目来源：Trees Made to Order题目大意：根据下面的规则给一棵二叉树编号：规则1：如果二叉树为空，则编号为0；规则2：如果二叉树只有一个节点，则编号为1；规则3：所有含有m个节点的二叉树的编号小于所有含有m+1个节点的二叉树的编号；规则4：如果一棵含有m个节点的二叉树（左子树为L，右... 阅读全文
