题目要求 Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. 题目分析及思路 给定一个二叉搜索树和一个目标值,若该树中存在两个元素的和等于目标值则返回true.可以先获得树中所有结点的值列表,然后遍历每个值,判断目标值与该值的差是否也在该列表中,并保存每…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 方法一:BFS 方法二:DFS 日期 题目地址:https://leetcode.com/problems/two-sum-iv-input-is-a-bst/description/ 题目描述 Given a Binary Search Tree and a target number, return true if there exist two…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: TrueExample 2: Input: 5 / \ 3 6 / \ \ 2 4…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

1.two sum 用hash来存储数值和对应的位置索引,通过target-当前值来获得需要的值,然后再hash中寻找 错误代码1: Input:[3,2,4]6Output:[0,0]Expected:[1,2] 同一个数字不能重复使用,但这个代码没排除这个问题 class Solution { public: vector<int> twoSum(vector<int>& nums, int target) { vector<int> result; uno…

problem 653. Two Sum IV - Input is a BST 参考 1. Leetcode_easy_653. Two Sum IV - Input is a BST; 完…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

Given the root of a Binary Search Tree and a target number k, return true if there exist two elements in the BST such that their sum is equal to the given target.    two sum 很经典,经典的题目是对一个数组进行two sum或者 three sum,排序后利用双指针检索,可以压缩搜索空间. 类似的还有以下几道题:   解题思路…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

［抄题］: Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \…

BST树求得两个节点的和是target //因为是BST所以中序遍历得到的是递增数组 //这个题的方法就是在一个递增数组中找到两个数的和相加是目标结果 /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ cl…

▶ 问题:给定一个数组 nums 及一个目标值 target,求数组中是否存在 n 项的和恰好等于目标值 ▶ 第 1题,n = 2,要求返回解 ● 代码,160 ms,穷举法,时间复杂度 O(n2),空间复杂度 O(1) class Solution { public: vector<int> twoSum(vector<int> nums, int target) { int i, j; ; i < nums.size()-; i++) { ; j < nums.si…

653. 两数之和 IV - 输入 BST 653. Two Sum IV - Input is a BST 题目描述 给定一个二叉搜索树和一个目标结果,如果 BST 中存在两个元素且它们的和等于给定的目标结果,则返回 true. LeetCode653. Two Sum IV - Input is a BST简单 案例 1: 输入: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 输出: True 案例 2: 输入: 5 / \ 3 6 / \ \ 2 4 7 Target…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

这是悦乐书的第280次更新,第296篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第148题(顺位题号是653).给定二进制搜索树和目标数,如果BST中存在两个元素,使得它们的总和等于给定目标,则返回true.例如: 5 / \ 3 6 / \ \ 2 4 7 目标值:9 输出:true 5 / \ 3 6 / \ \ 2 4 7 目标值:28 输出:false 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使用Jav…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

问题 该文章的最新版本已迁移至个人博客[比特飞],单击链接 https://www.byteflying.com/archives/4098 访问. 给定一个二叉搜索树和一个目标结果,如果 BST 中存在两个元素且它们的和等于给定的目标结果,则返回 true. 输入:  5    / \   3   6  / \   \ 2   4   7 Target = 9 输出: True 输入:  5    / \   3   6  / \   \ 2   4   7 Target = 28 输出: F…

我不懂有没有收藏之类的功能,收藏别人的解法. tql,不懂为什么直接比较set里的值,不是两个数sum么 有一些答案都用到了iterator迭代器 http://www.cplusplus.com/reference/iterator/ 我的思路是Just solve it as 2-sum problem using two pointers. 但是不懂重载的两个操作符 Need to implement BSTiterator class first, which overloads two…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True  Example 2: Input: 5 / \ 3 6 / \ \ 2…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 Java解法 Python解法 日期 题目地址:https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/#/description 题目描述 Given an array of integers that is already sorted in ascending order,…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / \ 3 6 / \ \ 2 4…

给定一个二叉搜索树和一个目标结果,如果 BST 中存在两个元素且它们的和等于给定的目标结果,则返回 true. struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } }; class Solution { public: TreeNode* node; bool findTarget(TreeNo…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 暴力 找规律 日期 题目地址:https://leetcode.com/problems/sum-of-even-numbers-after-queries/ 题目描述 We have an array A of integers, and an array queries of queries. For the i-th query val = q…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 单调递减栈 日期 题目地址:https://leetcode.com/problems/next-greater-node-in-linked-list/ 题目描述 We are given a linked list with head as the first node. Let's number the nodes in the list: no…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/description/ 题目描述 Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 方法一:DFS 方法二:迭代 日期 [LeetCode] 题目地址:https://leetcode.com/problems/binary-tree-level-order-traversal-ii/ Total Accepted: 55876 Total Submissions: 177210 Difficulty: Easy 题目描述 Given…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 迭代 日期 题目地址:https://leetcode.com/problems/delete-node-in-a-bst/description/ 题目描述 Given a root node reference of a BST and a key, delete the node with the given key in the BST. Re…

Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 m…