[LeetCode] 92. Reverse Linked List II 倒置链表之二

【[LeetCode] 92. Reverse Linked List II 倒置链表之二】的更多相关文章

[LeetCode] 92. Reverse Linked List II 倒置链表之二

Reverse a linked list from position m to n. Do it in one-pass. Note: 1 ≤ m ≤ n ≤ length of list. Example: Input: 1->2->3->4->5->NULL, m = 2, n = 4 Output: 1->4->3->2->5->NULL 很奇怪为何没有倒置链表之一,就来了这个倒置链表之二,不过猜也能猜得到之一就是单纯的倒置整个链表,而这…

LeetCode 92. Reverse Linked List II倒置链表2 C++

Reverse a linked list from position m to n. Do it in one-pass. Note: 1 ≤ m ≤ n ≤ length of list. Example: Input: 1->2->3->4->5->NULL, m = 2, n = 4 Output: 1->4->3->2->5->NULL 根据经验,先建立一个虚结点dummy node,连上原链表的头结点,这样的话就算头结点变动了,我们还…

[LeetCode] Reverse Linked List II 倒置链表之二

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 ≤ lengt…

[LeetCode] 92. Reverse Linked List II 反向链表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 condition:1 ≤ m ≤ n ≤ lengt…

[leetcode]92. Reverse Linked List II反转链表2

Reverse a linked list from position m to n. Do it in one-pass. Note: 1 ≤ m ≤ n ≤ length of list. Example: Input: 1->2->3->4->5->NULL, m = 2, n = 4 Output: 1->4->3->2->5->NULL 题意: 给定一个链表,反转第m~n个节点. 反转链表的一般思路 Solution1: 1.用指针找到…

[LeetCode 92] Reverse Linked List II 翻转单链表II

对于链表的问题,根据以往的经验一般都是要建一个dummy node,连上原链表的头结点,这样的话就算头结点变动了,我们还可以通过dummy->next来获得新链表的头结点.这道题的要求是只通过一次遍历完成,就拿题目中的例子来说,变换的是2,3,4这三个点,我们需要找到第一个开始变换结点的前一个结点,只要让pre向后走m-1步即可,为啥要减1呢,因为题目中是从1开始计数的,这里只走了1步,就是结点1,用pre指向它.万一是结点1开始变换的怎么办,这就是我们为啥要用dummy结点了,pre也可以指向…