Description: Create a binary sort tree, and the preorder traversal. Tree traversal is a fundamental operation, the so-called traversing a binary tree, that is, according to certain rules and order all over the binary tree all nodes, so that each node have been visited once and once only be accessed . The binary tree is a nonlinear structure, therefore, is essentially a tree traversal the binary tree each node will be converted into a linear sequence to represent.
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