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How to Solve Sort Items by Groups Respecting Dependencies Problem
Master the Sort Items by Groups Respecting Dependencies LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#1203
LeetCode ProblemSort Items by Groups Respecting Dependencies
There are n items each belonging to zero or one of m groups where group[i] is the group that the i-th item belongs to and it's equal to -1 if the i-th item belongs to no group. The items and the groups are zero indexed. A group can have no item belonging to it. Return a sorted list of the items such that: Return any solution if there is more than one solution and return an empty list if there is no solution.
Depth-First SearchBreadth-First SearchGraphTopological Sort
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Problem Breakdown
Understanding the Sort Items by Groups Respecting Dependencies Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There are n items each belonging to zero or one of m groups where group[i] is the group that the i-th item belongs to and it's equal to -1 if the i-th item belongs to no group. The items and the groups are zero indexed. A group can have no item belonging to it. Return a sorted list of the items such that: Return any solution if there is more than one solution and return an empty list if there is no solution.
HardProblem #1203
LeetCodeSort Items by Groups Respecting Dependencies
Related Topics
Depth-First SearchBreadth-First SearchGraphTopological Sort
How Phantom Code Helps
Get real-time assistance for Sort Items by Groups Respecting Dependencies problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
n = 8, m = 2, group = [-1,-1,1,0,0,1,0,-1], beforeItems = [[],[6],[5],[6],[3,6],[],[],[]]
Output
[6,3,4,1,5,2,0,7]
# Example 2
Input
n = 8, m = 2, group = [-1,-1,1,0,0,1,0,-1], beforeItems = [[],[6],[5],[6],[3],[],[4],[]]
Output
[]
Constraints
1 <= m <= n <= 3 * 104
group.length == beforeItems.length == n
-1 <= group[i] <= m - 1
0 <= beforeItems[i].length <= n - 1
0 <= beforeItems[i][j] <= n - 1
i != beforeItems[i][j]
beforeItems[i] does not contain duplicates elements.
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Solve Sort Items by Groups Respecting Dependencies — There are n items each belonging to zero or one of m groups where group[i] is th...
Here's the optimal approach using Depth-First Search:
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 Sort Items by Groups Respecting Dependencies and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Sort Items by Groups Respecting Dependencies 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 Sort Items by Groups Respecting Dependencies?
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 Sort Items by Groups Respecting Dependencies?
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 Sort Items by Groups Respecting Dependencies 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 Sort Items by Groups Respecting Dependencies 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 Sort Items by Groups Respecting Dependencies 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 Sort Items by Groups Respecting Dependencies 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 Sort Items by Groups Respecting Dependencies 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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