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How to Solve Divide Intervals Into Minimum Number of Groups Problem
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Start Free for WindowsMedium#2406
LeetCode ProblemDivide Intervals Into Minimum Number of Groups
You are given a 2D integer array intervals where intervals[i] = [lefti, righti] represents the inclusive interval [lefti, righti]. You have to divide the intervals into one or more groups such that each interval is in exactly one group, and no two intervals that are in the same group intersect each other. Return the minimum number of groups you need to make. Two intervals intersect if there is at least one common number between them. For example, the intervals [1, 5] and [5, 8] intersect.
ArrayTwo PointersGreedySortingHeap (Priority Queue)Prefix Sum
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Problem Breakdown
Understanding the Divide Intervals Into Minimum Number of Groups Problem
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Problem Statement
You are given a 2D integer array intervals where intervals[i] = [lefti, righti] represents the inclusive interval [lefti, righti]. You have to divide the intervals into one or more groups such that each interval is in exactly one group, and no two intervals that are in the same group intersect each other. Return the minimum number of groups you need to make. Two intervals intersect if there is at least one common number between them. For example, the intervals [1, 5] and [5, 8] intersect.
MediumProblem #2406
LeetCodeDivide Intervals Into Minimum Number of Groups
Related Topics
ArrayTwo PointersGreedySortingHeap (Priority Queue)Prefix Sum
How Phantom Code Helps
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Examples
# Example 1
Input
intervals = [[5,10],[6,8],[1,5],[2,3],[1,10]]
Output
3
# Example 2
Input
intervals = [[1,3],[5,6],[8,10],[11,13]]
Output
1
Constraints
1 <= intervals.length <= 105
intervals[i].length == 2
1 <= lefti <= righti <= 106
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Solve Divide Intervals Into Minimum Number of Groups — You are given a 2D integer array intervals where intervals[i] = [lefti, righti] ...
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
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How does Phantom Code help me solve coding problems like Divide Intervals Into Minimum Number of Groups 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 Divide Intervals Into Minimum Number of Groups?
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 Divide Intervals Into Minimum Number of Groups?
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 Divide Intervals Into Minimum Number of Groups 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 Divide Intervals Into Minimum Number of Groups 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 Divide Intervals Into Minimum Number of Groups 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 Divide Intervals Into Minimum Number of Groups 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 Divide Intervals Into Minimum Number of Groups 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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