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How to Solve Swap Nodes in Pairs Problem
Master the Swap Nodes in Pairs LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Medium#24
LeetCode ProblemSwap Nodes in Pairs
Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list's nodes (i.e., only nodes themselves may be changed.)
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Problem Breakdown
Understanding the Swap Nodes in Pairs Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list's nodes (i.e., only nodes themselves may be changed.)
MediumProblem #24
LeetCodeSwap Nodes in Pairs
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How PhantomCodeAI Helps
Get real-time assistance for Swap Nodes in Pairs problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.
Examples
# Example 1
Input
head = [1,2,3,4]
Output
[2,1,4,3]
# Example 2
Input
head = []
Output
[]
# Example 3
Input
head = [1]
Output
[1]
# Example 4
Input
head = [1,2,3]
Output
[2,1,3]
Constraints
The number of nodes in the list is in the range [0, 100].
0 <= Node.val <= 100
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Solve Swap Nodes in Pairs — Given a linked list, swap every two adjacent nodes and return its head. You must...
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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Frequently Asked Questions
Common questions about solving Swap Nodes in Pairs and using PhantomCodeAI during coding interviews.
How does PhantomCodeAI help with LeetCode problems during a coding interview?
PhantomCodeAI reads the problem from a screenshot or listens to it via audio, then generates a complete solution with a step-by-step approach and time/space complexity, so you can focus on explaining your reasoning rather than getting stuck on implementation.
Which programming languages does PhantomCodeAI support?
11 languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set a preferred language to get idiomatic solutions.
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Yes — it works alongside LeetCode, HackerRank, CodeSignal, CoderPad, and HackerEarth, plus any browser-based coding environment.
Can PhantomCodeAI handle follow-up questions and modifications?
Yes. Capture the modified problem by screenshot or audio and get an updated solution within seconds, including new edge cases and optimizations.
Is PhantomCodeAI detectable during live interviews?
PhantomCodeAI runs as a native desktop overlay that does not appear in screen shares, recordings, or proctoring software, and works with Zoom, Google Meet, Microsoft Teams, and major coding platforms.
Should I still practice these problems on my own first?
Yes. The most durable preparation is solving problems unaided first, then using AI afterward to review your approach, complexity, and missed edge cases — use it to debrief and learn, not to skip the reps.
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