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37 lines
768 B
37 lines
768 B
// File: binary_tree_bfs.go
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// Created Time: 2022-11-26
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// Author: Reanon (793584285@qq.com)
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package chapter_tree
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import (
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"container/list"
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. "github.com/krahets/hello-algo/pkg"
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)
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// levelOrder Breadth First Search
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func levelOrder(root *TreeNode) []int {
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// Let container.list as queue
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queue := list.New()
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// 初始化队列，加入根结点
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queue.PushBack(root)
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// 初始化一个切片，用于保存遍历序列
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nums := make([]int, 0)
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for queue.Len() > 0 {
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// poll
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node := queue.Remove(queue.Front()).(*TreeNode)
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// 保存结点
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nums = append(nums, node.Val)
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if node.Left != nil {
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// 左子结点入队
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queue.PushBack(node.Left)
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}
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if node.Right != nil {
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// 右子结点入队
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queue.PushBack(node.Right)
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}
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}
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return nums
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}
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