leetcode 100

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LeetCode 100. 相同的树(Same Tree) 2

100. 相同的树 100. Same Tree 题目描述给定两个二叉树,编写一个函数来检验它们是否相同. 如果两个树在结构上相同,并且节点具有相同的值,则认为它们是相同的. 每日一算法2019/5/5Day 2LeetCode100. Same Tree Java 实现 class TreeNode { int val; TreeNode left; TreeNode right; TreeNode(int x) { val = x; } } public class Solution {…

100. Same Tree Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 判断两个二叉树是否相同,结点的值和结构都相同. 采用递归来实现. 代码如下: /** * Defini…

LeetCode 100. Same Tree （相同的树）

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 题目标题:Tree 这道题目给了我们两个二叉树,让我们判断这两个二叉树是否一摸一样.利用preOrder 来遍历tree, 对于每…

LeetCode(100)题解--Same Tree

https://leetcode.com/problems/same-tree/ 题目: Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 思路: DFS AC代码: 1.递归 /…

LeetCode 100 及 101题

100. 相同的树给定两个二叉树,编写一个函数来检验它们是否相同. 如果两个树在结构上相同,并且节点具有相同的值,则认为它们是相同的. 示例 1: 输入: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] 输出: true 示例 2: 输入: 1 1 / \ 2 2 [1,2], [1,null,2] 输出: false 示例 3: 输入: 1 1 / \ / \ 2 1 1 2 [1,2,1], [1,1,2] 输出: false 源码: /** * Definiti…

LeetCode 100. Same Tree （判断树是否完全相同）

100. Same Tree Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: 1 1 / \ / \ 2 3 2 3 [1,2,3]…

[LeetCode] 100. Same Tree 相同树

Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] Outpu…

leetcode 100. Same Tree、101. Symmetric Tree

100. Same Tree class Solution { public: bool isSameTree(TreeNode* p, TreeNode* q) { if(p == NULL && q == NULL) return true; else if(p == NULL || q == NULL) return false; if(p->val != q->val) return false; return isSameTree(p->left,q->l…

Java实现 LeetCode 100 相同的树

100. 相同的树给定两个二叉树,编写一个函数来检验它们是否相同. 如果两个树在结构上相同,并且节点具有相同的值,则认为它们是相同的. 示例 1: 输入: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] 输出: true 示例 2: 输入: 1 1 / \ 2 2 [1,2], [1,null,2] 输出: false 示例 3: 输入: 1 1 / \ / \ 2 1 1 2 [1,2,1], [1,1,2] 输出: false class Solution { p…

leetcode 100. Same Tree

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 给出两个二叉树,写一个方法判断两个二叉树是否相等, 如果两个二叉树相等,说明结构相同并且每个节点的值相同. 如果两个节点都为空,则说…

leetcode 100 Same Tree ----- java

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 判断两棵树是否相同. 很简单.递归. /** * Definition for a binary tree node. * publ…

Java [Leetcode 100]Same Tree

题目描述: Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 解题思路: 递归调用比较左子树和右子树以及该节点. 代码描述: /** * Definition for a binar…

Leetcode 100 Same Tree python

题目: Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. class Solution(object): def isSameTree(self, p, q): if p == No…

19. leetcode 100. Same Tree

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 思路:利用递归.先判断根节点值是否相等,如果相等再分别判断左子树是否相等和右子树是否相等.…

[Leetcode]100. Same Tree -David_Lin

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 思路:同时递归两棵树,如果节点值不相等或者一棵树已经递归到头了而另一棵还没有,返回false; /** * Definition f…

(二叉树递归 DFS) leetcode 100. Same Tree

Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] Outpu…

LeetCode 100. Same Tree 判断两棵二叉树是否相等 C++

Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: / \ / \ [,,], [,,] Output: true Example 2:…

[leetcode]100. Same Tree相同的树

Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] Outpu…

[LeetCode] 100. Same Tree_Easy tag: DFS

Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] Outpu…

[LeetCode] 100. Same Tree ☆(两个二叉树是否相同)

描述解析根与根比较,左右子树互相递归比较即可. 代码 /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ class Solution { public boolean isSameTree(TreeNode p, TreeNode q) { i…

[Leetcode 100]判断二叉树相同 Same Tree

[题目] 判断二叉树是否相同. [思路] check函数. p==null并且q==null,返回true;(两边完全匹配) p==null或q==null,返回false;(p.q其中一方更短) p.val==q.val,值相同,继续迭代向左向右遍历check(p.left,q.left)&&check(p.right,q.right); [代码] public boolean check(TreeNode p, TreeNode q){ if(p==null&&q==n…

LeetCode 100.相同的树（C++）

给定两个二叉树,编写一个函数来检验它们是否相同. 如果两个树在结构上相同,并且节点具有相同的值,则认为它们是相同的. 示例 1: 输入: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] 输出: true 示例 2: 输入: 1 1 / \ 2 2 [1,2], [1,null,2] 输出: false 输出: false 示例 3: 输入: 1 1 / \ / \ 2 1 1 2 [1,2,1], [1,1,2] 输出: false 输出: false /** * De…

LeetCode 100——相同的树

1. 题目 2. 解答针对两棵树的根节点,有下列四种情况: p 和 q 都为空,两棵树相同: p 不为空 q 为空,两棵树不相同: p 为空 q 不为空,两棵树不相同: p 和 q 都不为空,如果两个节点的值相同,而且递归判断左右子树也相同的话,两棵树相同,反之两棵树不同. /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; *…

Java for LeetCode 100 Same Tree

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 解题思路: JAVA实现如下: public boolean isSameTree(TreeNode p, TreeNode q)…

Leetcode 100 Same Tree 二叉树

就是判断两棵树的值和结构是否相同注意:要判断是否所有的树节点是否为NULL /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: bool isSameTre…

LeetCode 100. Same Tree相同的树 (C++)

题目: Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical and the nodes have the same value. Example 1: Input: 1 1 / \ / \ 2 3 2 3 [1,2,3], [1,2,3] O…

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