因为不太熟悉链表操作,所以解决方法烦了点,空间时间多有冗余. 代码中l,r分别是每一组的需要交换的左右指针,temp是下一组的头指针,用于交换后链接:res是交换后的l指针,用于本组交换后尾指针在下一组交换后链接上交换后的头指针. /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} *…
#-*- coding: UTF-8 -*- # Definition for singly-linked list.# class ListNode(object):#     def __init__(self, x):#         self.val = x#         self.next = Noneclass Solution(object):    def swapPairs(self, head):        """        :type he…
# -*- 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…
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 v…
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 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…
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…