完成向二叉树中插入节点（即构建二叉树）、删除二叉树、复制二叉树，并完成中序遍历（返回节点数）、层序遍历（返回层高），测试程序结果应当完全正确-Completed to insert nodes in a binary tree (that is to build a binary tree), delete the binary tree, copy the binary tree, and completed in order traversal (return nodes) layer pr