对二叉树进行各种操作，包括建立，求深度，求节点个数和叶子节点个数，用括号表示法表示二叉树，查找指定节点的左右孩子，销毁二叉树-Various operations on the binary tree, including the establishment, seeking the depth of demand node number and leaf node number, said binary notation with parentheses, to find about the