return its level order traversal as: [ [3], [9,20], [15,7] ] OJ's Binary Tree Serialization: The serialization of a binary tree follows a level order traversal, where '#' signifies a path terminator where no node exists below. Here's an example: 1 / \ 2 3 / 4 \ 5 The abov...
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...
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 1. 2. 3. 4. 5. return its level order ...
Binary Tree Level Order Traversal (easy) Reverse Level Order Traversal (easy) Zigzag Traversal (medium) Level Averages in a Binary Tree (easy) Minimum Depth of a Binary Tree (easy) Level Order Successor (easy) Connect Level Order Siblings (medium) 8. Pattern: Tree Depth First Search,树上的...
return its level order traversal as: [[3],[9,20],[15,7]] 解法 这道题适合用广度优先搜索(BFS),以及 BFS 适用于什么样的场景。 DFS(深度优先搜索)和 BFS(广度优先搜索)就像孪生兄弟,提到一个总是想起另一个。然而在实际使用中,我们用 DFS 的时候远远多于 BFS。那么,是不是 BFS 就没有什么用呢?
return its level order traversal as: 代码语言:javascript 复制 [[3],[9,20],[15,7]] 解法 这道题适合用广度优先搜索(BFS),以及 BFS 适用于什么样的场景。 DFS(深度优先搜索)和 BFS(广度优先搜索)就像孪生兄弟,提到一个总是想起另一个。然而在实际使用中,我们用 DFS 的时候远远多于 BFS。那么,是不是...
Binary Tree Level Order Traversal II是姊妹题,解题思路都是一样的,只是结果要求的顺序是反的,同样有两种方法,也就是经常说到的DFS深度优先遍历和BFS广度优先遍历。 BFS: 广度优先遍历就是一层层地攻略过去,把每一层的所有节点都记录下来再走向下一层。因为每层会有多个节点,不是简单的一个左节点一个右节点的...
Description Given an n-ary tree, return the level order traversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples).
LeetCode: 103_Binary Tree Zigzag Level Order Traversal | 二叉树Zigzag层次遍历 | Medium 发布于2018-01-11 10:51:16 6730 举报 文章被收录于专栏:Linux云计算网络 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: 代码语言:javascript 复制 1 str...
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