输入一个字符串，并建成一棵二叉树，满足左子树的字符都要小于根结点的字符，右字树的字符都要大于根结点的字符，每个结点值有字符和字符的出现次数，并用三种遍历方法打印，比较是否与自己想象的相一致。再求树的深度、叶子结点数、最大结点值。-Enter a string, and the completion of a binary tree, to meet the characters in the left subtree must be less than the root node of the

构造一棵二叉树、释放二叉链表中各结点的存储空间、获取指向二叉树根结点的指针、前序遍历二叉树、中序遍历二叉树、后序遍历二叉树等的编程-Construct a binary tree, the release of storage space for each node in the binary list, access points to the binary tree root pointer, before traversing Binary inorder binary tree trav