31 lines
555 B
Go
31 lines
555 B
Go
package main
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type TreeNode struct {
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Val int
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Left *TreeNode
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Right *TreeNode
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}
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/**
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* Definition for a binary tree node.
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* type TreeNode struct {
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* Val int
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* Left *TreeNode
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* Right *TreeNode
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* }
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*/
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func preorderTraversalInPlace(root *TreeNode, list *[]int) {
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if root == nil {
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return
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}
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*list = append(*list, root.Val)
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preorderTraversalInPlace(root.Left, list)
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preorderTraversalInPlace(root.Right, list)
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}
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func preorderTraversal(root *TreeNode) []int {
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list := &[]int{}
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preorderTraversalInPlace(root, list)
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return *list
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}
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