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How to Solve Restore the Array From Adjacent Pairs Problem
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Start Free for WindowsMedium#1743
LeetCode ProblemRestore the Array From Adjacent Pairs
There is an integer array nums that consists of n unique elements, but you have forgotten it. However, you do remember every pair of adjacent elements in nums. You are given a 2D integer array adjacentPairs of size n - 1 where each adjacentPairs[i] = [ui, vi] indicates that the elements ui and vi are adjacent in nums. It is guaranteed that every adjacent pair of elements nums[i] and nums[i+1] will exist in adjacentPairs, either as [nums[i], nums[i+1]] or [nums[i+1], nums[i]]. The pairs can appear in any order. Return the original array nums. If there are multiple solutions, return any of them.
ArrayHash TableDepth-First Search
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Problem Breakdown
Understanding the Restore the Array From Adjacent Pairs Problem
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Problem Statement
There is an integer array nums that consists of n unique elements, but you have forgotten it. However, you do remember every pair of adjacent elements in nums. You are given a 2D integer array adjacentPairs of size n - 1 where each adjacentPairs[i] = [ui, vi] indicates that the elements ui and vi are adjacent in nums. It is guaranteed that every adjacent pair of elements nums[i] and nums[i+1] will exist in adjacentPairs, either as [nums[i], nums[i+1]] or [nums[i+1], nums[i]]. The pairs can appear in any order. Return the original array nums. If there are multiple solutions, return any of them.
MediumProblem #1743
LeetCodeRestore the Array From Adjacent Pairs
Related Topics
ArrayHash TableDepth-First Search
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Examples
# Example 1
Input
adjacentPairs = [[2,1],[3,4],[3,2]]
Output
[1,2,3,4]
# Example 2
Input
adjacentPairs = [[4,-2],[1,4],[-3,1]]
Output
[-2,4,1,-3]
# Example 3
Input
adjacentPairs = [[100000,-100000]]
Output
[100000,-100000]
Constraints
nums.length == n
adjacentPairs.length == n - 1
adjacentPairs[i].length == 2
2 <= n <= 105
-105 <= nums[i], ui, vi <= 105
There exists some nums that has adjacentPairs as its pairs.
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Solve Restore the Array From Adjacent Pairs — There is an integer array nums that consists of n unique elements, but you have ...
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def solve(input):
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Frequently Asked Questions
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How does Phantom Code help me solve coding problems like Restore the Array From Adjacent Pairs 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.
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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.
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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 Restore the Array From Adjacent Pairs 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.
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How does Phantom Code help when I'm struggling with Restore the Array From Adjacent Pairs 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 Restore the Array From Adjacent Pairs 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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