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How to Solve Count Pairs of Points With Distance k Problem
Master the Count Pairs of Points With Distance k LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#2857
LeetCode ProblemCount Pairs of Points With Distance k
You are given a 2D integer array coordinates and an integer k, where coordinates[i] = [xi, yi] are the coordinates of the ith point in a 2D plane. We define the distance between two points (x1, y1) and (x2, y2) as (x1 XOR x2) + (y1 XOR y2) where XOR is the bitwise XOR operation. Return the number of pairs (i, j) such that i < j and the distance between points i and j is equal to k.
ArrayHash TableBit Manipulation
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Problem Breakdown
Understanding the Count Pairs of Points With Distance k Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a 2D integer array coordinates and an integer k, where coordinates[i] = [xi, yi] are the coordinates of the ith point in a 2D plane. We define the distance between two points (x1, y1) and (x2, y2) as (x1 XOR x2) + (y1 XOR y2) where XOR is the bitwise XOR operation. Return the number of pairs (i, j) such that i < j and the distance between points i and j is equal to k.
MediumProblem #2857
LeetCodeCount Pairs of Points With Distance k
Related Topics
ArrayHash TableBit Manipulation
How Phantom Code Helps
Get real-time assistance for Count Pairs of Points With Distance k problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
coordinates = [[1,2],[4,2],[1,3],[5,2]], k = 5
Output
2
# Example 2
Input
coordinates = [[1,3],[1,3],[1,3],[1,3],[1,3]], k = 0
Output
10
Constraints
2 <= coordinates.length <= 50000
0 <= xi, yi <= 106
0 <= k <= 100
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Solve Count Pairs of Points With Distance k — You are given a 2D integer array coordinates and an integer k, where coordinates...
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 Points With Distance k and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Count Pairs of Points With Distance k 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 Points With Distance k?
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 Points With Distance k?
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 Points With Distance k 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 Points With Distance k 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 Points With Distance k 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 Points With Distance k 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 Points With Distance k 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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