二叉树的四种遍历结果，各结点层序输出，计算各结点总数，找一种遍历结果中第n个结点的双亲结点，孩子结点和第几个位置的结点。-The results of the four binary tree traversal, each node sequence output, calculate the total number of nodes, find a loop through the results of the first n nodes of parent nodes, child no