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How to Solve Group the People Given the Group Size They Belong To Problem
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Start Free for WindowsMedium#1282
LeetCode ProblemGroup the People Given the Group Size They Belong To
There are n people that are split into some unknown number of groups. Each person is labeled with a unique ID from 0 to n - 1. You are given an integer array groupSizes, where groupSizes[i] is the size of the group that person i is in. For example, if groupSizes[1] = 3, then person 1 must be in a group of size 3. Return a list of groups such that each person i is in a group of size groupSizes[i]. Each person should appear in exactly one group, and every person must be in a group. If there are multiple answers, return any of them. It is guaranteed that there will be at least one valid solution for the given input.
ArrayHash TableGreedy
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Problem Breakdown
Understanding the Group the People Given the Group Size They Belong To Problem
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Problem Statement
There are n people that are split into some unknown number of groups. Each person is labeled with a unique ID from 0 to n - 1. You are given an integer array groupSizes, where groupSizes[i] is the size of the group that person i is in. For example, if groupSizes[1] = 3, then person 1 must be in a group of size 3. Return a list of groups such that each person i is in a group of size groupSizes[i]. Each person should appear in exactly one group, and every person must be in a group. If there are multiple answers, return any of them. It is guaranteed that there will be at least one valid solution for the given input.
MediumProblem #1282
LeetCodeGroup the People Given the Group Size They Belong To
Related Topics
ArrayHash TableGreedy
How Phantom Code Helps
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Examples
# Example 1
Input
groupSizes = [3,3,3,3,3,1,3]
Output
[[5],[0,1,2],[3,4,6]]
# Example 2
Input
groupSizes = [2,1,3,3,3,2]
Output
[[1],[0,5],[2,3,4]]
Constraints
groupSizes.length == n
1 <= n <= 500
1 <= groupSizes[i] <= n
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Solve Group the People Given the Group Size They Belong To — There are n people that are split into some unknown number of groups. Each perso...
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 Group the People Given the Group Size They Belong To and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Group the People Given the Group Size They Belong To 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 Group the People Given the Group Size They Belong To?
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 Group the People Given the Group Size They Belong To?
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 Group the People Given the Group Size They Belong To 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 Group the People Given the Group Size They Belong To 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 Group the People Given the Group Size They Belong To 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 Group the People Given the Group Size They Belong To 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 Group the People Given the Group Size They Belong To 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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