Java Interview Questions · interview question

Which practice avoids a common mistake with Union-Find and Disjoint Set?

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Silence the Union-Find and Disjoint Set problem by using raw types, broad catches, or shared mutable state.Prefer the version of Union-Find and Disjoint Set that makes behavior less predictable as long as the code compiles.Do not forget path compression or union by rank or size when performance on repeated operations matters.Ignore the Union-Find and Disjoint Set issue and rely on team discipline instead of APIs or contracts.

Answer and explanation

Correct answer

C. Do not forget path compression or union by rank or size when performance on repeated operations matters.

Why

Do not forget path compression or union by rank or size when performance on repeated operations matters. This is a common failure mode in real Java code and a frequent interview follow-up.

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Which practice avoids a common mistake with Union-Find and Disjoint Set?

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