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Count interval intersections

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of interval relationships, efficient counting under large constraints, and algorithmic complexity analysis for overlapping ranges.

  • Medium
  • MathWorks
  • Coding & Algorithms
  • Software Engineer

Count interval intersections

Company: MathWorks

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: Medium

Interview Round: Take-home Project

##### Question For a list of n segments, where each segment i has start[i] and end[i], compute for every segment the count of other segments that intersect it (share at least one common point). Return an array counts where counts[i] is the number of intersections for segment i. Constraints: 1 ≤ n ≤ 10^5, 1 ≤ start[i] ≤ end[i] ≤ 10^9.

Quick Answer: This question evaluates understanding of interval relationships, efficient counting under large constraints, and algorithmic complexity analysis for overlapping ranges.

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MathWorks
Aug 4, 2025, 10:55 AM
Software Engineer
Take-home Project
Coding & Algorithms
1
0
Question

For a list of n segments, where each segment i has start[i] and end[i], compute for every segment the count of other segments that intersect it (share at least one common point). Return an array counts where counts[i] is the number of intersections for segment i.

Constraints: 1 ≤ n ≤ 10^5, 1 ≤ start[i] ≤ end[i] ≤ 10^9.

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