You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
1.5 KiB
62 lines
1.5 KiB
/**
|
|
* File: binary_tree.js
|
|
* Created Time: 2022-12-04
|
|
* Author: IsChristina (christinaxia77@foxmail.com)
|
|
*/
|
|
|
|
const { arrToTree } = require("../include/TreeNode");
|
|
const { printTree } = require("../include/PrintUtil");
|
|
|
|
// 初始化列表，用于存储遍历序列
|
|
var list = []
|
|
|
|
/* 前序遍历 */
|
|
function preOrder(root){
|
|
if (root === null) return;
|
|
// 访问优先级：根结点 -> 左子树 -> 右子树
|
|
list.push(root.val);
|
|
preOrder(root.left);
|
|
preOrder(root.right);
|
|
}
|
|
|
|
/* 中序遍历 */
|
|
function inOrder(root) {
|
|
if (root === null) return;
|
|
// 访问优先级：左子树 -> 根结点 -> 右子树
|
|
inOrder(root.left);
|
|
list.push(root.val);
|
|
inOrder(root.right);
|
|
}
|
|
|
|
/* 后序遍历 */
|
|
function postOrder(root) {
|
|
if (root === null) return;
|
|
// 访问优先级：左子树 -> 右子树 -> 根结点
|
|
postOrder(root.left);
|
|
postOrder(root.right);
|
|
list.push(root.val);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/* 前序遍历 */
|
|
list.length = 0;
|
|
preOrder(root);
|
|
console.log("\n前序遍历的结点打印序列 = " + list);
|
|
|
|
/* 中序遍历 */
|
|
list.length = 0;
|
|
inOrder(root);
|
|
console.log("\n中序遍历的结点打印序列 = " + list);
|
|
|
|
/* 后序遍历 */
|
|
list.length = 0;
|
|
postOrder(root);
|
|
console.log("\n后序遍历的结点打印序列 = " + list);
|
|
|