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How to Solve Reverse Nodes in k-Group Problem
Master the Reverse Nodes in k-Group LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#25
LeetCode ProblemReverse 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?
Linked ListRecursion
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Problem Breakdown
Understanding the Reverse Nodes in k-Group Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
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?
HardProblem #25
LeetCodeReverse Nodes in k-Group
Related Topics
Linked ListRecursion
How Phantom Code Helps
Get real-time assistance for Reverse Nodes in k-Group problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
head = [1,2,3,4,5], k = 2
Output
[2,1,4,3,5]
# Example 2
Input
head = [1,2,3,4,5], k = 3
Output
[3,2,1,4,5]
Constraints
The number of nodes in the list is n.
1 <= k <= n <= 5000
0 <= Node.val <= 1000
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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:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Undetectability Checklist
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Platform Compatibility
Zoom
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Google Meet
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HackerRank
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CodeSignal
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CoderPad
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Teams
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We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.
Frequently Asked Questions
Common questions about solving Reverse Nodes in k-Group and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Reverse Nodes in k-Group during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Reverse Nodes in k-Group?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Reverse Nodes in k-Group?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Reverse Nodes in k-Group type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Reverse Nodes in k-Group interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Reverse Nodes in k-Group during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Reverse Nodes in k-Group style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Reverse Nodes in k-Group interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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