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35 lines
1.0 KiB
35 lines
1.0 KiB
8 months ago
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/**
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* File: binary_tree_bfs.js
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* Created Time: 2022-12-04
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* Author: IsChristina (christinaxia77@foxmail.com)
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*/
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const { arrToTree } = require('../modules/TreeNode');
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const { printTree } = require('../modules/PrintUtil');
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/* 層序走訪 */
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function levelOrder(root) {
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// 初始化佇列，加入根節點
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const queue = [root];
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// 初始化一個串列，用於儲存走訪序列
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const list = [];
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while (queue.length) {
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let node = queue.shift(); // 隊列出隊
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list.push(node.val); // 儲存節點值
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if (node.left) queue.push(node.left); // 左子節點入列
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if (node.right) queue.push(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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/* Driver Code */
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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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const root = arrToTree([1, 2, 3, 4, 5, 6, 7]);
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console.log('\n初始化二元樹\n');
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printTree(root);
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/* 層序走訪 */
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const list = levelOrder(root);
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console.log('\n層序走訪的節點列印序列 = ' + list);
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