mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 00:46:28 +08:00
34 lines
1 KiB
JavaScript
34 lines
1 KiB
JavaScript
/**
|
|
* File: binary_tree_bfs.js
|
|
* Created Time: 2022-12-04
|
|
* Author: IsChristina (christinaxia77@foxmail.com)
|
|
*/
|
|
|
|
const { arrToTree } = require('../modules/TreeNode');
|
|
const { printTree } = require('../modules/PrintUtil');
|
|
|
|
/* 层序遍历 */
|
|
function levelOrder(root) {
|
|
// 初始化队列，加入根节点
|
|
const queue = [root];
|
|
// 初始化一个列表，用于保存遍历序列
|
|
const list = [];
|
|
while (queue.length) {
|
|
let node = queue.shift(); // 队列出队
|
|
list.push(node.val); // 保存节点值
|
|
if (node.left) queue.push(node.left); // 左子节点入队
|
|
if (node.right) queue.push(node.right); // 右子节点入队
|
|
}
|
|
return list;
|
|
}
|
|
|
|
/* Driver Code */
|
|
/* 初始化二叉树 */
|
|
// 这里借助了一个从数组直接生成二叉树的函数
|
|
const root = arrToTree([1, 2, 3, 4, 5, 6, 7]);
|
|
console.log('\n初始化二叉树\n');
|
|
printTree(root);
|
|
|
|
/* 层序遍历 */
|
|
const list = levelOrder(root);
|
|
console.log('\n层序遍历的节点打印序列 = ' + list);
|