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25. Reverse Nodes in k-Group

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.

k is a positive integer and is less than or equal to the length of the linked list. If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is.

Example:

Given this linked list: 1->2->3->4->5

For k = 2, you should return: 2->1->4->3->5

For k = 3, you should return: 3->2->1->4->5

Note:

Difficulty:

Hard

Lock:

Normal

Company:

Adobe Amazon Apple ByteDance Cisco Cohesity eBay Expedia Facebook Goo Google Mathworks Microsoft Paypal VMware

Solution(Chinese):

LEETCODE 25. Reverse Nodes in k-Group 解题思路分析