Queue<TreeNode> queue =newLinkedList<TreeNode>(); queue.add( root );while( !queue.isEmpty() ) { Queue<TreeNode> tempQ =newLinkedList<TreeNode>(); temp=newArrayList<Integer>();while( !queue.isEmpty() ) { TreeNode tn=queue.poll();if( tn.left !=null) { tempQ.add( tn.left );...
LeetCode 102. 二叉树的层次遍历(BFS) 给定一个二叉树,返回其按层次遍历的节点值。 (即逐层地,从左到右访问所有节点)。 代码语言:javascript \920/\157返回其层次遍历结果:[[3],9,20],[15 来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/binary-tree-level-order-traversal 著作权归领扣网...
* Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * };*/classSolution {public: vector<int> largestValues(TreeNode*root) { vector<int>vec;if(!root){returnvec; }...
=root){val queue=LinkedList<TreeNode>()queue.offer(root)while(queue.isNotEmpty()){val levelList=mutableListOf<Int>()val size=queue.size// 此处的for循环会把当前 level 层的所有元素poll出来,同时把下一层待遍历的节点放入队列for(iin0..size-1){// removes the head (first element)...
1、树的蛇形走位(遍历):Binary Tree Zigzag Level Order Traversal - LeetCodeGiven a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right…
[leetcode] Binary Tree Zigzag Level Order Traversal | zigzag形状traverse树 Posted by: lexigrey on: October 19, 2013 In: leetcode Leave a Comment 树的dfs变形,还是两个list来回倒。但是这题上来就写还不行,真心得在纸上画一画才能看出来规律。一开始觉得keep一个boolean,正常顺序就加后面,逆序就...
DFS代码参考地址:LeetCode Binary Tree Level Order Traversal 其他题目: Binary Tree Level Order Traversal II 层次遍历从低往root结点输出,如Given binary tree{3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: ...
leetcode二叉树-二叉树的最大深度 dfs、bfs,packagebinarytree.maxDepth;importbinarytree.untils.GenerateTreeNode;importbinarytree.untils.TreeNode;importjava.util.ArrayList;importjava.uti
voiddfs(TreeNoderoot){dfs(root.left);visit(root);dfs(root.right);} ③ 后序 voiddfs(TreeNoderoot){dfs(root.left);dfs(root.right);visit(root);} 1. 非递归实现二叉树的前序遍历 144. Binary Tree Preorder Traversal (Medium) Leetcode/力扣:https://leetcode-cn.com/problems/binary-tree-pre...
2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution {