已知二叉树采用二叉链表存储结构，编写一个算法交换二叉树所有左、右子树的位置，即结点的左子树变为结点的右子树，右子树变为左子树。-Known binary tree using linked list storage structure, the preparation of a binary tree algorithm for the exchange of all the left and right subtree of the location, that is, the left no