Union Find Interview Questions

Master 9 union find problems frequently asked in technical interviews. These questions test your understanding of union findconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

The Earliest Moment When Everyone Become Friends

Asked at Oracle

Array Union Find Sorting

Rank

#694MediumFrequency: 98%

Number of Distinct Islands

Asked at Flipkart

Hash Table Depth-First Search Breadth-First Search Union Find Hash Function

Rank

#200MediumFrequency: 82%

Number of Islands

Asked at Amazon

Array Depth-First Search Breadth-First Search Union Find Matrix

Rank

#305HardFrequency: 79%

Number of Islands II

Asked at Uber

Array Hash Table Union Find

Rank

#128MediumFrequency: 66%

Longest Consecutive Sequence

Asked at DoorDash

Array Hash Table Union Find

Rank

#399MediumFrequency: 63%

Evaluate Division

Asked at Uber

Array String Depth-First Search Breadth-First Search Union Find Graph Shortest Path

Rank

#721MediumFrequency: 62%

Accounts Merge

Asked at Meta

Array Hash Table String Depth-First Search Breadth-First Search Union Find Sorting

Rank

#854HardFrequency: 60%

Making A Large Island

Asked at Meta

Array Depth-First Search Breadth-First Search Union Find Matrix

Rank

#1257HardFrequency: 34%

Rank Transform of a Matrix

Asked at Salesforce

Array Union Find Graph Topological Sort Sorting Matrix

Rank

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Union Find Interview Questions

Master 9 union find problems frequently asked in technical interviews. These questions test your understanding of union findconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard