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…

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…

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…

题意:给一个单链表,将其每两个结点交换,只改尾指针,不改元素值. 思路:迭代法和递归法都容易写,就写个递归的了. 4ms /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: ListNode* swapPairs(List…

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…

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, onl…

1.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 t…

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. For example,Given1->2->3->4, you should return the list as2->1->4->3. Your algorithm should use only constant space. You may not modify the values in the list, only…

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…

# Definition for singly-linked list. # class ListNode(object): # def __init__(self, x): # self.val = x # self.next = None class Solution(object): def swapPairs(self, head): """ :type head: ListNode :rtype: ListNode """ if hea…

Reverse a linked list from position m to n. Do it in-place and in one-pass. For example: Given 1->2->3->4->5->NULL, m = 2 and n = 4, return 1->4->3->2->5->NULL. Note: Given m, n satisfy the following condition: 1 ≤ m ≤ n ≤ le…

2991: 链表节点逆置(线性表) 时间限制: 1 Sec  内存限制: 128 MB 提交: 14  解决: 6 题目描述 设计一个算法,将一个带头节点的数据域依次为a1,a2,-,an(n>=3)的单链表的所有节点逆置,即第一个节点的数据域变为an,--,最后一个节点的数据域变为a1,请尽量采用较优算法,时间复杂度为O(n)最佳! 线性表的定义为 typedef struct Node {     ElemType data;     struct Node *next; } SqList;…

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 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 val…

# -*- 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…

本文为senlie原创,转载请保留此地址:http://blog.csdn.net/zhengsenlie Swap Nodes in Pairs Total Accepted: 12511 Total Submissions: 39302 Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the…

问题描述:1->2->3->4,假设k=2进行反转,得到2->1->4->3:k=3进行反转,得到3->2->1->4 算法思想:基本操作就是链表反转,将k个元素当作滑动窗口,依次进行反转. public class ReverseNodesInKGroup { public ListNode reverseKGroup(ListNode head, int k) { if (k == 1 || head == null || head.next ==…

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->…

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…

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…

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…

1. 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…

题目: 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…

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…

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. Challenge Your algorithm should use only constant space. You may not modify the values in the l…

leetcode-algorithms-24 Swap Nodes in Pairs 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 s…