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28 lines
582 B
28 lines
582 B
// File: preorder_traversal_iii_compact.go
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// Created Time: 2023-05-09
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// Author: Reanon (793584285@qq.com)
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package chapter_backtracking
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import (
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. "github.com/krahets/hello-algo/pkg"
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)
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/* 前序遍历：例题三 */
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func preOrderIII(root *TreeNode, res *[][]*TreeNode, path *[]*TreeNode) {
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// 剪枝
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if root == nil || root.Val == 3 {
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return
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}
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// 尝试
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*path = append(*path, root)
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if root.Val.(int) == 7 {
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// 记录解
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*res = append(*res, *path)
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}
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preOrderIII(root.Left, res, path)
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preOrderIII(root.Right, res, path)
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// 回退
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*path = (*path)[:len(*path)-1]
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}
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