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41 lines
1.3 KiB
41 lines
1.3 KiB
/**
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* File: binary_tree_bfs.cs
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* Created Time: 2022-12-23
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* Author: haptear (haptear@hotmail.com)
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*/
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namespace hello_algo.chapter_tree;
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public class binary_tree_bfs {
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/* 層序走訪 */
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List<int> LevelOrder(TreeNode root) {
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// 初始化佇列，加入根節點
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Queue<TreeNode> queue = new();
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queue.Enqueue(root);
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// 初始化一個串列，用於儲存走訪序列
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List<int> list = [];
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while (queue.Count != 0) {
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TreeNode node = queue.Dequeue(); // 隊列出隊
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list.Add(node.val!.Value); // 儲存節點值
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if (node.left != null)
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queue.Enqueue(node.left); // 左子節點入列
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if (node.right != null)
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queue.Enqueue(node.right); // 右子節點入列
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}
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return list;
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}
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[Test]
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public void Test() {
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/* 初始化二元樹 */
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// 這裡藉助了一個從陣列直接生成二元樹的函式
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TreeNode? root = TreeNode.ListToTree([1, 2, 3, 4, 5, 6, 7]);
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Console.WriteLine("\n初始化二元樹\n");
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PrintUtil.PrintTree(root);
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List<int> list = LevelOrder(root!);
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Console.WriteLine("\n層序走訪的節點列印序列 = " + string.Join(",", list));
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}
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}
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