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How to Solve Power Grid Maintenance Problem
Master the Power Grid Maintenance LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#3607
LeetCode ProblemPower Grid Maintenance
You are given an integer c representing c power stations, each with a unique identifier id from 1 to c (1‑based indexing). These stations are interconnected via n bidirectional cables, represented by a 2D array connections, where each element connections[i] = [ui, vi] indicates a connection between station ui and station vi. Stations that are directly or indirectly connected form a power grid. Initially, all stations are online (operational). You are also given a 2D array queries, where each query is one of the following two types: Return an array of integers representing the results of each query of type [1, x] in the order they appear. Note: The power grid preserves its structure; an offline (non‑operational) node remains part of its grid and taking it offline does not alter connectivity.
ArrayHash TableDepth-First SearchBreadth-First SearchUnion FindGraphHeap (Priority Queue)Ordered Set
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Problem Breakdown
Understanding the Power Grid Maintenance Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given an integer c representing c power stations, each with a unique identifier id from 1 to c (1‑based indexing). These stations are interconnected via n bidirectional cables, represented by a 2D array connections, where each element connections[i] = [ui, vi] indicates a connection between station ui and station vi. Stations that are directly or indirectly connected form a power grid. Initially, all stations are online (operational). You are also given a 2D array queries, where each query is one of the following two types: Return an array of integers representing the results of each query of type [1, x] in the order they appear. Note: The power grid preserves its structure; an offline (non‑operational) node remains part of its grid and taking it offline does not alter connectivity.
MediumProblem #3607
LeetCodePower Grid Maintenance
Related Topics
ArrayHash TableDepth-First SearchBreadth-First SearchUnion FindGraphHeap (Priority Queue)Ordered Set
How Phantom Code Helps
Get real-time assistance for Power Grid Maintenance problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
c = 5, connections = [[1,2],[2,3],[3,4],[4,5]], queries = [[1,3],[2,1],[1,1],[2,2],[1,2]]
Output
[3,2,3]
# Example 2
Input
c = 3, connections = [], queries = [[1,1],[2,1],[1,1]]
Output
[1,-1]
Constraints
1 <= c <= 105
0 <= n == connections.length <= min(105, c * (c - 1) / 2)
connections[i].length == 2
1 <= ui, vi <= c
ui != vi
1 <= queries.length <= 2 * 105
queries[i].length == 2
queries[i][0] is either 1 or 2.
1 <= queries[i][1] <= c
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Solve Power Grid Maintenance — You are given an integer c representing c power stations, each with a unique ide...
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 Power Grid Maintenance and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Power Grid Maintenance 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 Power Grid Maintenance?
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 Power Grid Maintenance?
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 Power Grid Maintenance 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 Power Grid Maintenance 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 Power Grid Maintenance 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 Power Grid Maintenance 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 Power Grid Maintenance 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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