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34 lines
1 KiB
JavaScript
34 lines
1 KiB
JavaScript
/**
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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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/* 层序遍历 */
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function levelOrder(root) {
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// 初始化队列，加入根节点
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const queue = [root];
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// 初始化一个列表，用于保存遍历序列
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const list = [];
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while (queue.length) {
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let node = queue.shift(); // 队列出队
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list.push(node.val); // 保存节点值
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if (node.left) queue.push(node.left); // 左子节点入队
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if (node.right) queue.push(node.right); // 右子节点入队
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}
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return list;
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}
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/* Driver Code */
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/* 初始化二叉树 */
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// 这里借助了一个从数组直接生成二叉树的函数
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const root = arrToTree([1, 2, 3, 4, 5, 6, 7]);
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console.log('\n初始化二叉树\n');
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printTree(root);
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/* 层序遍历 */
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const list = levelOrder(root);
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console.log('\n层序遍历的节点打印序列 = ' + list);
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