Implementation and basic operation of binary sort tree

Binary sort tree is also called binary lookup tree. It is either an empty tree or a binary tree with the following properties:

① If the left subtree is not empty, the values of all nodes on the left subtree are less than the values of its root node;

② If the right subtree is not empty, the values of all nodes on the right subtree are greater than those of its root node;

③ The left and right subtrees are also binary sort trees.

The following code implements:

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