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How to Solve Count Pairs Of Nodes Problem
Master the Count Pairs Of Nodes LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemCount Pairs Of Nodes
You are given an undirected graph defined by an integer n, the number of nodes, and a 2D integer array edges, the edges in the graph, where edges[i] = [ui, vi] indicates that there is an undirected edge between ui and vi. You are also given an integer array queries. Let incident(a, b) be defined as the number of edges that are connected to either node a or b. The answer to the jth query is the number of pairs of nodes (a, b) that satisfy both of the following conditions: Return an array answers such that answers.length == queries.length and answers[j] is the answer of the jth query. Note that there can be multiple edges between the same two nodes.
ArrayHash TableTwo PointersBinary SearchGraphSortingCounting
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Problem Breakdown
Understanding the Count Pairs Of Nodes Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given an undirected graph defined by an integer n, the number of nodes, and a 2D integer array edges, the edges in the graph, where edges[i] = [ui, vi] indicates that there is an undirected edge between ui and vi. You are also given an integer array queries. Let incident(a, b) be defined as the number of edges that are connected to either node a or b. The answer to the jth query is the number of pairs of nodes (a, b) that satisfy both of the following conditions: Return an array answers such that answers.length == queries.length and answers[j] is the answer of the jth query. Note that there can be multiple edges between the same two nodes.
HardProblem #1782
LeetCodeCount Pairs Of Nodes
Related Topics
ArrayHash TableTwo PointersBinary SearchGraphSortingCounting
How Phantom Code Helps
Get real-time assistance for Count Pairs Of Nodes problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
n = 4, edges = [[1,2],[2,4],[1,3],[2,3],[2,1]], queries = [2,3]
Output
[6,5]
# Example 2
Input
n = 5, edges = [[1,5],[1,5],[3,4],[2,5],[1,3],[5,1],[2,3],[2,5]], queries = [1,2,3,4,5]
Output
[10,10,9,8,6]
Constraints
2 <= n <= 2 * 104
1 <= edges.length <= 105
1 <= ui, vi <= n
ui != vi
1 <= queries.length <= 20
0 <= queries[j] < edges.length
How Phantom Code Helps with LeetCode Problems
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Solve Count Pairs Of Nodes — You are given an undirected graph defined by an integer n, the number of nodes, ...
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 Count Pairs Of Nodes and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Count Pairs Of Nodes 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 Count Pairs Of Nodes?
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 Count Pairs Of Nodes?
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 Count Pairs Of Nodes 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 Count Pairs Of Nodes 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 Count Pairs Of Nodes 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 Count Pairs Of Nodes 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 Count Pairs Of Nodes 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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