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61 lines
1.5 KiB
61 lines
1.5 KiB
/**
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* File: binary_tree_dfs.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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// 初始化列表，用于存储遍历序列
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const list = [];
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/* 前序遍历 */
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function preOrder(root) {
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if (root === null) return;
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// 访问优先级：根节点 -> 左子树 -> 右子树
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list.push(root.val);
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preOrder(root.left);
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preOrder(root.right);
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}
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/* 中序遍历 */
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function inOrder(root) {
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if (root === null) return;
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// 访问优先级：左子树 -> 根节点 -> 右子树
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inOrder(root.left);
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list.push(root.val);
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inOrder(root.right);
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}
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/* 后序遍历 */
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function postOrder(root) {
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if (root === null) return;
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// 访问优先级：左子树 -> 右子树 -> 根节点
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postOrder(root.left);
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postOrder(root.right);
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list.push(root.val);
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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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/* 前序遍历 */
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list.length = 0;
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preOrder(root);
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console.log('\n前序遍历的节点打印序列 = ' + list);
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/* 中序遍历 */
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list.length = 0;
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inOrder(root);
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console.log('\n中序遍历的节点打印序列 = ' + list);
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/* 后序遍历 */
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list.length = 0;
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postOrder(root);
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console.log('\n后序遍历的节点打印序列 = ' + list);
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