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How to Solve Find the Longest Semi-Repetitive Substring Problem
Master the Find the Longest Semi-Repetitive Substring LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#2730
LeetCode ProblemFind the Longest Semi-Repetitive Substring
You are given a digit string s that consists of digits from 0 to 9. A string is called semi-repetitive if there is at most one adjacent pair of the same digit. For example, "0010", "002020", "0123", "2002", and "54944" are semi-repetitive while the following are not: "00101022" (adjacent same digit pairs are 00 and 22), and "1101234883" (adjacent same digit pairs are 11 and 88). Return the length of the longest semi-repetitive substring of s.
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Problem Breakdown
Understanding the Find the Longest Semi-Repetitive Substring Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a digit string s that consists of digits from 0 to 9. A string is called semi-repetitive if there is at most one adjacent pair of the same digit. For example, "0010", "002020", "0123", "2002", and "54944" are semi-repetitive while the following are not: "00101022" (adjacent same digit pairs are 00 and 22), and "1101234883" (adjacent same digit pairs are 11 and 88). Return the length of the longest semi-repetitive substring of s.
MediumProblem #2730
LeetCodeFind the Longest Semi-Repetitive Substring
Related Topics
StringSliding Window
How Phantom Code Helps
Get real-time assistance for Find the Longest Semi-Repetitive Substring problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "52233"
Output
4
# Example 2
Input
s = "5494"
Output
4
# Example 3
Input
s = "1111111"
Output
2
Constraints
1 <= s.length <= 50
'0' <= s[i] <= '9'
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Solve Find the Longest Semi-Repetitive Substring — You are given a digit string s that consists of digits from 0 to 9. A string is ...
Here's the optimal approach using String:
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 Find the Longest Semi-Repetitive Substring and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Find the Longest Semi-Repetitive Substring 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 Find the Longest Semi-Repetitive Substring?
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 Find the Longest Semi-Repetitive Substring?
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 Find the Longest Semi-Repetitive Substring 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 Find the Longest Semi-Repetitive Substring 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 Find the Longest Semi-Repetitive Substring 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 Find the Longest Semi-Repetitive Substring 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 Find the Longest Semi-Repetitive Substring 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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