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 node node subtree into right subtree, right subtree into left subtree.