25 lines
460 B
Go
25 lines
460 B
Go
// Package q144 implements a solution for https://leetcode.com/problems/binary-tree-preorder-traversal/
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package q144
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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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func walk(node *TreeNode, ret *[]int) {
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if node == nil {
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return
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}
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*ret = append(*ret, node.Val)
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walk(node.Left, ret)
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walk(node.Right, ret)
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}
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func preorderTraversal(root *TreeNode) []int {
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ret := []int{}
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walk(root, &ret)
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return ret
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}
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var _ = preorderTraversal
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