|
|
|
|
/**
|
|
|
|
|
* File: binary_tree.js
|
|
|
|
|
* Created Time: 2022-12-04
|
|
|
|
|
* Author: IsChristina (christinaxia77@foxmail.com)
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
const { arrToTree } = require("../include/TreeNode");
|
|
|
|
|
const { printTree } = require("../include/PrintUtil");
|
|
|
|
|
|
|
|
|
|
/* 层序遍历 */
|
|
|
|
|
function hierOrder(root) {
|
|
|
|
|
// 初始化队列，加入根结点
|
|
|
|
|
let queue = [root];
|
|
|
|
|
// 初始化一个列表，用于保存遍历序列
|
|
|
|
|
let list = [];
|
|
|
|
|
while (queue.length) {
|
|
|
|
|
let node = queue.shift(); // 队列出队
|
|
|
|
|
list.push(node.val); // 保存结点
|
|
|
|
|
if (node.left)
|
|
|
|
|
queue.push(node.left); // 左子结点入队
|
|
|
|
|
if (node.right)
|
|
|
|
|
queue.push(node.right); // 右子结点入队
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
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
|
|
|
|
|
var root = arrToTree([1, 2, 3, 4, 5, 6, 7, null, null, null, null, null, null, null, null]);
|
|
|
|
|
console.log("\n初始化二叉树\n");
|
|
|
|
|
printTree(root);
|
|
|
|
|
|
|
|
|
|
/* 层序遍历 */
|
|
|
|
|
let list = hierOrder(root);
|
|
|
|
|
console.log("\n层序遍历的结点打印序列 = " + list);
|
