Shulou(Shulou.com)06/01 Report--

This article mainly explains "what is the preorder traversal method of Java tree". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what is the preorder traversal method of the Java tree?"

Package maintype Node struct {Val int Children [] * Node} func preorder (root * Node) [] int {if root==nil {return nil} res: = make ([] int,0) helper (root,&res) return res} func helper (root * Node,res * [] int) {if root==nil {return} * res = append (* res,root.Val) for iVON0TIVI

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