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How to Solve Alternating Groups I Problem
Master the Alternating Groups I LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemAlternating Groups I
There is a circle of red and blue tiles. You are given an array of integers colors. The color of tile i is represented by colors[i]: Every 3 contiguous tiles in the circle with alternating colors (the middle tile has a different color from its left and right tiles) is called an alternating group. Return the number of alternating groups. Note that since colors represents a circle, the first and the last tiles are considered to be next to each other.
ArraySliding Window
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Problem Breakdown
Understanding the Alternating Groups I Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There is a circle of red and blue tiles. You are given an array of integers colors. The color of tile i is represented by colors[i]: Every 3 contiguous tiles in the circle with alternating colors (the middle tile has a different color from its left and right tiles) is called an alternating group. Return the number of alternating groups. Note that since colors represents a circle, the first and the last tiles are considered to be next to each other.
EasyProblem #3206
LeetCodeAlternating Groups I
Related Topics
ArraySliding Window
How Phantom Code Helps
Get real-time assistance for Alternating Groups I problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
colors = [1,1,1]
Output
0
# Example 2
Input
colors = [0,1,0,0,1]
Output
3
Constraints
3 <= colors.length <= 100
0 <= colors[i] <= 1
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Solve Alternating Groups I — There is a circle of red and blue tiles. You are given an array of integers colo...
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 Alternating Groups I and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Alternating Groups I 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 Alternating Groups I?
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 Alternating Groups I?
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 Alternating Groups I 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 Alternating Groups I 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 Alternating Groups I 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 Alternating Groups I 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 Alternating Groups I 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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