[题目要求直接翻转链表,而非申请新的空间] 这道题的一个关键在于,当m=1时,需要翻转的链表段前没有其他的结点(leetcode的测试用例不含头结点),这个特例给解题带来了一点小小的困难.一个比较直观.比较方便的想法是在链表中插入一个头结点,这样处理起来方便很多.除此之外,还要注意各种循环边界条件的设置. /** * Definition for singly-linked list. * struct ListNode { * int val; * struct ListNode *next;…

1. Reverse Linked List 题目链接 题目要求: Reverse a singly linked list. Hint: A linked list can be reversed either iteratively or recursively. Could you implement both? 初想用递归来实现应该会挺好的,但最终运行时间有点久,达到72ms,虽然没超时.具体程序如下: /** * Definition for singly-linked list. *…

92. 反转链表 II 92. Reverse Linked List II 题目描述 反转从位置 m 到 n 的链表.请使用一趟扫描完成反转. 说明: 1 ≤ m ≤ n ≤ 链表长度. LeetCode92. Reverse Linked List II中等 示例: 输入: 1->2->3->4->5->NULL, m = 2, n = 4 输出: 1->4->3->2->5->NULL Java 实现 public class ListNo…

Reverse Linked List II 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 co…

题目:Reverse Linked List II 题意:Reverse a linked list from position m to n. Do it in-place and in one-pass. 下面这段代码,有两个地方,一个是4.5行的dummy节点设置:另一个是11-14行,局部可视化到全局. ListNode *reverseBetween(ListNode *head, int m, int n) { if(m == n) return head; n -= m; List…

1 题目 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 ≤…

Reverse Linked List II 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 cond…

2018-09-11 22:58:29 一.Reverse Linked List 问题描述: 问题求解: 解法一:Iteratively,不断执行插入操作. public ListNode reverseList(ListNode head) { if (head == null) return null; ListNode dummy = new ListNode(-1); dummy.next = head; ListNode cur = head; ListNode then = nul…

1.  Reverse Linked List II  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 follo…

1. Reverse Linked List II 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 c…