Stack的实现在这里。 let fullTreeTwo =depthFirstTraversal(rootNodeA); console.log(fullTreeTwo); 二叉树的遍历,深度优先、广度优先的时间复杂度和空间复杂度都是O(n)。 总结一下 1. 广度优先,按层从左往右访问节点 2. 深度优先,顺着分支访问节点,直到叶子节点,然后开始回溯
}/*** NLR:前序遍历(Preorder Traversal 亦称(先序遍历)) * 访问根结点的操作发生在遍历其左右子树之前。*/publicvoidpreOrderTraversal() {//NSystem.out.print(this);//Lif(this.leftSubNode !=null) {this.leftSubNode.preOrderTraversal(); }//Rif(this.rightSubNode !=null) {this.rightSubNode.p...
private void pushAllTheLeft(Stack<TreeNode> s, TreeNode root){ s.push(root); while(root.left!=null){ root = root.left; s.push(root); } } } Binary Tree Postorder Traversal Given a binary tree, return the postorder traversal of its nodes' values. For example: Given binary tree {1,...
Given the root of a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level). Example 1: Input: root = [3,9,20,null,null,15,7] Output: [[3],[9,20],[15,7]] Example 2: Input: root = [1] Output: [[1]] Example ...
Binary Tree Traversal Binary Tree Reconstruction(leetcode可用) Polish Notation/Reverse Polish Notation N-ary Tree 什么是树(Tree),树的概念是什么 https://www.geeksforgeeks.org/binary-tree-set-1-introduction/www.geeksforgeeks.org/binary-tree-set-1-introduction/ ...
push(NULL); 29 int nLevelCount = 1; 30 while (true) { 31 TreeNode *pTemp = tree_queue.front(); 32 tree_queue.pop(); 33 if (pTemp == NULL) { 34 if (nLevelCount%2 == 0) { //if the num of level is odd, swap the ivec; 35 Swap(ivec); 36 } 37 tree_vector.push_...
Binary Tree Level Order Traversal Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary tree [3,9,20,null,null,15,7], 代码语言:javascript ...
Traverse the left sub tree of root. Traverse the right sub tree of root. Note:Preorder traversal is also known as NLR traversal. Algorithm: Algorithm preorder(t) /*t is a binary tree. Each node of t has three fields: lchild, data, and rchild.*/ { If t! =0 then { Visit(t); ...
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A tree is composed of a collection of nodes, where each node has some associated data and a set of children. A node's children are those nodes that appear immediately beneath the node itself. A node's parent is the node immediately above it. A tree's root is the single node that ...