本实例实现了二叉树相关的一系列算法，包括建立二叉树、二叉树的前序、中序和后序遍历、统计数的结点数和叶子结点数。-The examples of the binary tree algorithm, including the establishment of a binary tree, binary tree preorder, inorder, and postorder traversal, statistical number of nodes and leaf nodes.