感觉这个题后台的运行程序有问题,一开始自己想的是反转链表那道题的方法,只是隔一个节点执行一次,但是没有通过,TLE了,但是很奇怪,并没有死循环,就是最后返回的时候超时. 最后的思路就是很简单的进行交换,设置一个头结点前边的0节点先把第三个节点接到第一个上边,然后把第一个接到第二个上,然后把第二个节点接到0节点上,然后把当前节点设置成第一个节点(现在是第二个,而且是下次交换的0节点) public ListNode swapPairs(ListNode head) { if (head==null…

Given a linked list, swap every two adjacent nodes and return its head.For example,Given 1->2->3->4, you should return the list as 2->1->4->3.Your algorithm should use only constant space. You may not modify the values in the list, only…

题意:交换链表中每两个相邻节点,不能修改节点的val值. 分析:递归.如果以第三个结点为头结点的链表已经两两交换完毕(这一步递归实现---swapPairs(head -> next -> next)),则接下来,只需交换前两个节点,再将第一个节点的next指向“以第三个结点为头结点的链表两两交换后”的链表. /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * L…

Swap Nodes in Pairs 描述 给定一个链表,两两交换其中相邻的节点,并返回交换后的链表. 示例: 给定 1->2->3->4, 你应该返回 2->1->4->3. 说明: 你的算法只能使用常数的额外空间. 你不能只是单纯的改变节点内部的值,而是需要实际的进行节点交换. 思路 该题属于基本的链表操作题. 设置一个虚拟头结点dummyHead 设置需要交换的两个节点分别为node1.node2,同时设置node2的下一个节点next 在这一轮操作中 将nod…

Swap Nodes in Pairs  Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the v…

题目内容 Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list’s nodes, only nodes itself may be changed.大概意思是说每两个节点为一组交换位置.只使用常量空间,不能修改链表的值,只能修改链表的指针 解法(迭代) class Solution { public: ListNode* s…

题目链接: https://leetcode.com/problems/swap-nodes-in-pairs/?tab=Description   Problem: 交换相邻的两个节点     如上图所示,递归进行交换.从最尾端开始,当最尾端只有一个节点时,停止交换 否则执行 swap(head.next)    参考代码:   package leetcode_50; /** * * @author pengfei_zheng * 交换相邻节点 */ public class Solutio…

Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, only nodes itself may be changed. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. 题意: 给定一个链表,…

Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the values in the list, on…

Given a linked list, swap every two adjacent nodes and return its head. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. Note: Your algorithm should use only constant extra space. You may not modify the values in the…

题目标签:Linked List 题目给了我们一组 linked list,让我们把每对nodes 互换位置. 新键一个dummy node,然后遍历list,每次建立 s1 和 s2 记录两个点,然后互换位置,具体看code. Java Solution: Runtime:  0 ms, faster than 100 % Memory Usage: 34 MB, less than 100 % 完成日期:05/22/2019 关键点:换位置时候先后顺序 /** * Definition fo…

Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, only nodes itself may be changed. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. -----------…

Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the values in the list, onl…

Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, only nodes itself may be changed. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. 这道题不算难,是基本的…

Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, only nodes itself may be changed. Example: Given ->->->, you should ->->->. 奇数位和偶数位互换,若是奇数个,不用管最后一个 解法一:(C++) List…

题目描述: Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the values in the li…

Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the values in the list, on…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 24: Swap Nodes in Pairshttps://oj.leetcode.com/problems/swap-nodes-in-pairs/ Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you sh…

24. Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the…

24. Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. For example, Given ->->->, you should ->->->. Your algorithm should use only constant space. You may not modify the values in the list, only…

题目:swap nodes in pairs <span style="font-size:18px;">/** * LeetCode Swap Nodes in Pairs * 题目:输入一个链表,要求将链表每相邻的两个节点交换位置后输出 * 思路:遍历一遍就可以,时间复杂度O(n) * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * Li…

Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the val…

Given a linked list and two values v1 and v2. Swap the two nodes in the linked list with values v1 and v2. It's guaranteed there is no duplicate values in the linked list. If v1 or v2 does not exist in the given linked list, do nothing. Notice You sh…

Swap Nodes in Pairs [LeetCode] https://leetcode.com/problems/swap-nodes-in-pairs/ Total Accepted: 95332 Total Submissions: 270806 Difficulty: Easy Question Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->…

题目描述:Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify th…

题目 Given a linked list, swap every two adjacent nodes and return its head. You may not modify the values in the list's nodes, only nodes itself may be changed. Example:  Given 1->2->3->4,you should return the list as 2->1->4->3. 思路 思路一:遍…

Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. You may not modify the values in the list, onl…

［抄题］: Given a linked list, swap every two adjacent nodes and return its head. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. Note: Your algorithm should use only constant extra space. You may not modify the values i…

▶ 问题:单链表中的元素进行交换或轮换. ▶ 24. 每两个元素进行翻转.如 [1 → 2 → 3 → 4 → 5] 变换为 [2 → 1 → 4 → 3 → 5] ● 初版代码,4 ms class Solution { public: ListNode* swapPairs(ListNode* head) { int length; ListNode newHead(-), *x, *y; newHead.next = head; // 添加头结点,方便操作原链表的首元 ; x != nul…

给定一个链表,对每两个相邻的结点作交换并返回头节点.例如:给定 1->2->3->4,你应该返回 2->1->4->3.你的算法应该只使用额外的常数空间.不要修改列表中的值,只有节点本身可以​​更改. 详见:https://leetcode.com/problems/swap-nodes-in-pairs/description/ 实现语言:Java 方法一: /** * Definition for singly-linked list. * public class…