[LeetCode] Binary Tree Level Order Traversal
A classic tree traversal problem. I share my two solutions here: BFS and DFS. BFS: 1 vector<vector<int>> levelOrder(TreeNode *root) { 2 vector<vector<int>> leve...
【LeetCode从零单排】No102 Binary Tree Level Order Traversal
题目 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...
[LeetCode]103.Binary Tree Zigzag Level Order Traversal
【题目】 Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example: Gi...
[LeetCode]102.Binary Tree Level Order Traversal
【题目】 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}, 3 / \ 9 20 ....
LeetCode: 103_Binary Tree Zigzag Level Order Traversal | 二叉树Zigzag层次遍历 | Medium
本题也属于层次遍历的变形，不同之处在于其遍历的方法是交替进行的，形成一个ZigZag的曲线形式，如下： 代码如下： 1 struct TreeNode { 2 int val; 3 TreeNode* left; 4 TreeNode* right; 5 TreeNode(int x): val(x), left(...
LeetCode: 107_Binary Tree Level Order Traversal II | 二叉树自底向上的层次遍历 | Easy
本题和上题一样同属于层次遍历，不同的是本题从底层往上遍历，如下： 代码如下： 1 struct TreeNode { 2 int val; 3 TreeNode* left; 4 TreeNode* right; 5 TreeNode():val(0),left(NULL),right(NULL){} 6 ...
LeetCode: 102_Binary Tree Level Order Traversal | 二叉树自顶向下的层次遍历 | Easy
题目：Binay 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,#,...
[leetcode]107.Binary Tree Level Order Traversal II
【题目】 Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example: Given binary tree {3,...
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