How to Solve Reverse Nodes in k-Group Problem
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Reverse Nodes in k-Group
Given the head of a linked list, reverse the nodes of the list k at a time, and return the 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. You may not alter the values in the list's nodes, only nodes themselves may be changed. Example 1: Example 2: Constraints: Follow-up: Can you solve the problem in O(1) extra memory space?
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Understanding the Reverse Nodes in k-Group Problem
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Problem Statement
Given the head of a linked list, reverse the nodes of the list k at a time, and return the 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. You may not alter the values in the list's nodes, only nodes themselves may be changed. Example 1: Example 2: Constraints: Follow-up: Can you solve the problem in O(1) extra memory space?
Reverse Nodes in k-Group
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Examples
# Example 1
head = [1,2,3,4,5], k = 2
[2,1,4,3,5]
# Example 2
head = [1,2,3,4,5], k = 3
[3,2,1,4,5]
Constraints
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Solve Reverse Nodes in k-Group — Given the head of a linked list, reverse the nodes of the list k at a time, and ...
Here's the optimal approach using Linked List:
Time: O(n) | Space: O(n)
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