Introduction - If you have any usage issues, please Google them yourself
Binary tree is an important non-linear data structure, intuitively, it is a data element (called nodes in the tree) organized according to the relationship between branches structure, much like a tree in nature as. Tree structure in the objective world is widespread, such as human society, family tree and a variety of social organizations can be used tree image representation. Tree in the computer field has also been widely used, such as the source code is compiled as follows, the source tree can be used to express the following syntax structure. Another example is in the system, the tree structure is one of the important forms of information organization. All problems with hierarchical relationships can be described in terms of trees. Full binary tree, complete binary tree, sort binary tree.
Postorder traversal is a kind of binary tree traversal. After traversing the root node, traversing the left subtree and traversing the right subtree, we first traverse the left subtree, and then