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How to Solve Longest Uncommon Subsequence II Problem
Master the Longest Uncommon Subsequence II LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#522
LeetCode ProblemLongest Uncommon Subsequence II
Given an array of strings strs, return the length of the longest uncommon subsequence between them. If the longest uncommon subsequence does not exist, return -1. An uncommon subsequence between an array of strings is a string that is a subsequence of one string but not the others. A subsequence of a string s is a string that can be obtained after deleting any number of characters from s.
ArrayHash TableTwo PointersStringSorting
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Problem Breakdown
Understanding the Longest Uncommon Subsequence II Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given an array of strings strs, return the length of the longest uncommon subsequence between them. If the longest uncommon subsequence does not exist, return -1. An uncommon subsequence between an array of strings is a string that is a subsequence of one string but not the others. A subsequence of a string s is a string that can be obtained after deleting any number of characters from s.
MediumProblem #522
LeetCodeLongest Uncommon Subsequence II
Related Topics
ArrayHash TableTwo PointersStringSorting
How Phantom Code Helps
Get real-time assistance for Longest Uncommon Subsequence II problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
strs = ["aba","cdc","eae"]
Output
3
# Example 2
Input
strs = ["aaa","aaa","aa"]
Output
-1
Constraints
2 <= strs.length <= 50
1 <= strs[i].length <= 10
strs[i] consists of lowercase English letters.
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Solve Longest Uncommon Subsequence II — Given an array of strings strs, return the length of the longest uncommon subseq...
Here's the optimal approach using Array:
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 Longest Uncommon Subsequence II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Longest Uncommon Subsequence II 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 Longest Uncommon Subsequence II?
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 Longest Uncommon Subsequence II?
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 Longest Uncommon Subsequence II 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 Longest Uncommon Subsequence II 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 Longest Uncommon Subsequence II 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 Longest Uncommon Subsequence II 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 Longest Uncommon Subsequence II 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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