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Back to Problems

1101. The Earliest Moment When Everyone Become Friends

Medium65.5% AcceptancePremium
ArrayUnion FindSorting
ProblemHints (4)SolutionsVideosCompanies (2)Notes

Problem Statement

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Asked by:
G
Google
E
Expedia

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Problem Hints

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1
Hint 1

Sort the log items by their timestamp.

2
Hint 2

How can we model this problem as a graph problem?

3
Hint 3

Let's use a union-find data structure. At the beginning we have a graph with N nodes but no edges.

4
Hint 4

Then we loop through the events and unite each node until the number of connected components reach to 1. Notice that each time two different connected components are united the number of connected components decreases by 1.

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Video Solutions

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THE EARLIEST MOMENT WHEN EVERYONE BECOMES FRIENDS | LEETCODE 1101 | PYTHON GRAPH SOLUTION

Cracking FAANG
12:024,084 views

Asked By Companies

2 companies
G
Google
E
Expedia

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Notes

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Similar Problems

Related Topics

ArrayUnion FindSorting

Problem Stats

Acceptance Rate65.5%
DifficultyMedium
Companies2

Practice on LeetCode

Solve with full IDE support and test cases

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Frequently Asked Questions

Why do we sort the logs in The Earliest Moment When Everyone Become Friends?

Sorting ensures that friendship events are processed in chronological order. This allows us to simulate the growth of the social network over time and correctly identify the earliest moment when everyone becomes connected.

Is The Earliest Moment When Everyone Become Friends asked in FAANG interviews?

Yes, problems involving Union Find and dynamic connectivity frequently appear in FAANG-style interviews. This question tests understanding of graph connectivity, sorting, and efficient set merging techniques.

What data structure is best for The Earliest Moment When Everyone Become Friends?

Union Find (Disjoint Set Union) is the best data structure for this problem. It efficiently tracks connected components and supports fast union and find operations with path compression and union by rank.

What is the optimal approach for The Earliest Moment When Everyone Become Friends?

The optimal approach is to sort all friendship logs by timestamp and process them using a Union Find data structure. Each log merges two people into the same connected component. The earliest time when only one component remains is the answer.

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