return its level order traversal as: [ [3], [9,20], [15,7] ] SOLUTION 1: 使用队列来解决,很直观。注意在每次换层的时候,新建一个List. 1/**2* Definition for binary tree3* public class TreeNode {4* int val;5* TreeNode left;6* TreeNode right;7* TreeNode(int x) { val = x; ...
一、递归实现 1/**2* Definition for binary tree3* struct TreeNode {4* int val;5* TreeNode *left;6* TreeNode *right;7* TreeNode(int x) : val(x), left(NULL), right(NULL) {}8* };9*/10classSolution {11public:12vector<vector<int> > levelOrder(TreeNode *root) {13vector<vector...
Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). 给出一棵二叉树,返回其节点值的层次遍历(逐层从左往右访问) 【题目链接】 www.lintcode.com/en/problem/binary-tree-level-order-traversal/ 【题目解析】 对于二叉树的问题,我们...
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], 3 / \ 9 20 / \ 15 7 return its level order traversal as: [[3],[...
public List<List<Integer>> levelOrder(TreeNode root) { List<List<Integer>> ans = new ArrayList<>(); DFS(root, 0, ans); return ans; } private void DFS(TreeNode root, int level, List<List<Integer>> ans) { if(root == null){ return; } //当前层数还没有元素,先 new 一个空的列表...
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 ...
1 BFS迭代,借用之前min depth和maxdepth of bianry tree 的框架 1 struct newNode{ 2 TreeNode * node; 3 int dep; // current depth 4 }; 5 6 class Solution { 7 public: 8 vector< vector<int> > levelOrder(TreeNode *root) { 9 vector<vector<int> > result; ...
描述: 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,#,#,15,7}, return its level order trav...
In this article, we will discuss 3 different techniques for Level Order Traversal of a binary tree. This technique can be used to find the left and right view of the tree.
高频刷题-102. Binary Tree Level Order Traversal 和 103. Binary Tree Zigzag Level Order Traversal,程序员大本营,技术文章内容聚合第一站。