problem0025

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Published: Feb 15, 2020 License: MIT Imports: 1 Imported by: 0

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25. Reverse Nodes in k-Group

题目

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:

  • Only constant extra memory is allowed.
  • You may not alter the values in the list's nodes, only nodes itself may be changed.

解题思路

见程序注释

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Constants

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Variables

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Functions

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Types

type ListNode

type ListNode = kit.ListNode

ListNode defines for singly-linked list.

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