Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. /** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

给定一个二叉树,找出其最大深度. 二叉树的深度为根节点到最远叶子节点的最长路径上的节点数. 说明: 叶子节点是指没有子节点的节点. 示例:给定二叉树 [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回它的最大深度 3 . /** * Definition for a binary tree node. * function TreeNode(val) { * this.val = val; * this.left = this.right = null…

/** * Definition for a binary tree node. * public class TreeNode { * public int val; * public TreeNode left; * public TreeNode right; * public TreeNode(int x) { val = x; } * } */ public class Solution { System.Collections.Generic.Stack<TreeNode> S =…

给定一个二叉树,找出其最大深度. 二叉树的深度为根节点到最远叶子节点的最长路径上的节点数. 说明: 叶子节点是指没有子节点的节点. 示例:给定二叉树 [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回它的最大深度 3 . /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * Tr…

Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7]…

题意:二叉树最大深度 思路:递归,但是不知道怎么回事直接在return里面计算总是报超时,用俩变量就可以A···奇怪,没想通 代码: int maxDepth(TreeNode* root) { if(!root) ; ; ; return (l > r) ? l : r; }…

easy 题就不详细叙述题面和样例了,见谅. 题面 统计二叉树的最大深度. 算法 递归搜索二叉树,返回左右子树的最大深度. 源码 class Solution { public: int maxDepth(TreeNode* root) { if(root == nullptr) ; //根节点算一层 ; return max(getDepth(root->left, res), getDepth(root->right, res));//递归 } int getDepth(TreeNode*…

题目描述 给出一组数字,返回该组数字的所有排列 例如: [1,2,3]的所有排列如下 [1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2], [3,2,1].  (以数字在数组中的位置靠前为优先级,按字典序排列输出.)   Given a collection of numbers, return all possible permutations. For example, [1,2,3]have the following permutations: [1,2,3]…

/** * Definition for a binary tree node. * public class TreeNode { * public int val; * public TreeNode left; * public TreeNode right; * public TreeNode(int x) { val = x; } * } */ public class Solution { Stack<TreeNode> S = new Stack<TreeNode>(…