Greatest Common Divisor Interview Questions

Master 21 greatest common divisor problems frequently asked in technical interviews. These questions test your understanding of greatest common divisorconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Find the Number of Subsequences With Equal GCD

Asked at Infosys

Array Math Dynamic Programming Number Theory Euclidean Algorithm Greatest Common Divisor

Rank

#2301HardFrequency: 73.2%

Count Array Pairs Divisible by K

Asked at PayPal

Array Hash Table Math Counting Number Theory Euclidean Algorithm Greatest Common Divisor

Rank

#149HardFrequency: 56.3%

Max Points on a Line

Asked at LinkedIn

Array Hash Table Math Geometry Euclidean Algorithm Greatest Common Divisor

Rank

#1146EasyFrequency: 51.4%

Greatest Common Divisor of Strings

Asked at TikTok

Math String Euclidean Algorithm Greatest Common Divisor

Rank

#796HardFrequency: 50.3%

Reaching Points

Asked at PayPal

Math Euclidean Algorithm Greatest Common Divisor

Rank

#365MediumFrequency: 48%

Water and Jug Problem

Asked at TikTok

Math Depth-First Search Breadth-First Search Bézout's Lemma Euclidean Algorithm Greatest Common Divisor Extended Euclidean Algorithm

Rank

#2423HardFrequency: 44.7%

Minimum Deletions to Make Array Divisible

Asked at LinkedIn

Array Math Sorting Heap (Priority Queue)Number Theory Euclidean Algorithm Greatest Common Divisor

Rank

#2307HardFrequency: 33.5%

Replace Non-Coprime Numbers in Array

Asked at Uber

Array Math Stack Number Theory Least Common Multiple Greatest Common Divisor

Rank

#1947HardFrequency: 31.3%

Number of Different Subsequences GCDs

Asked at Infosys

Array Math Counting Number Theory Euclidean Algorithm Greatest Common Divisor

Rank

#2125HardFrequency: 26.5%

GCD Sort of an Array

Asked at Amazon

Array Math Union-Find Sorting Number Theory Prime Factorization Euclidean Algorithm Greatest Common Divisor

#10

Rank

#950EasyFrequency: 24.4%

X of a Kind in a Deck of Cards

Asked at Google

Array Hash Table Math Counting Number Theory Euclidean Algorithm Greatest Common Divisor

#11

Rank

#1543MediumFrequency: 18%

Simplified Fractions

Asked at Google

Math String Number Theory Euclidean Algorithm Greatest Common Divisor

#12

Rank

#2507EasyFrequency: 16.4%

Number of Common Factors

Asked at Google

Math Enumeration Number Theory Euclidean Algorithm Greatest Common Divisor

#13

Rank

#3583HardFrequency: 16.4%

Sorted GCD Pair Queries

Asked at Google

Array Hash Table Math Binary Search Combinatorics Counting Number Theory Prefix Sum Euclidean Algorithm Greatest Common Divisor

#14

Rank

#2753MediumFrequency: 16.4%

Minimum Number of Operations to Make All Array Elements Equal to 1

Asked at Google

Array Math Number Theory Euclidean Algorithm Greatest Common Divisor

#15

Rank

#2106EasyFrequency: 14.6%

Find Greatest Common Divisor of Array

Asked at Google

Array Math Number Theory Euclidean Algorithm Greatest Common Divisor

#16

Rank

#592MediumFrequency: 12.6%

Fraction Addition and Subtraction

Asked at Google

Math String Simulation Euclidean Algorithm Greatest Common Divisor

#17

Rank

#888MediumFrequency: 10.3%

Mirror Reflection

Asked at Amazon

Math Geometry Number Theory Least Common Multiple Greatest Common Divisor

#18

Rank

#1372HardFrequency: 8.1%

Check If It Is a Good Array

Asked at Google

Array Math Number Theory Bézout's Lemma Euclidean Algorithm Greatest Common Divisor Extended Euclidean Algorithm

#19

Rank

#1307MediumFrequency: 7.2%

Ugly Number III

Asked at Amazon

Math Binary Search Combinatorics Number Theory Least Common Multiple Euclidean Algorithm Greatest Common Divisor Inclusion-Exclusion Principle

#20

Rank

#2609MediumFrequency: 5%

Distinct Prime Factors of Product of Array

Asked at Google

Array Hash Table Math Number Theory Prime Factorization Euclidean Algorithm Primality Test Greatest Common Divisor Sieve Theory Prime Number Sieve

#21

Rank

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Greatest Common Divisor Interview Questions

Related Topics

Find the Number of Subsequences With Equal GCD

Count Array Pairs Divisible by K

Max Points on a Line

Greatest Common Divisor of Strings

Reaching Points

Water and Jug Problem

Minimum Deletions to Make Array Divisible

Replace Non-Coprime Numbers in Array

Number of Different Subsequences GCDs

GCD Sort of an Array

X of a Kind in a Deck of Cards

Simplified Fractions

Number of Common Factors

Sorted GCD Pair Queries

Minimum Number of Operations to Make All Array Elements Equal to 1

Find Greatest Common Divisor of Array

Fraction Addition and Subtraction

Mirror Reflection

Check If It Is a Good Array

Ugly Number III

Distinct Prime Factors of Product of Array

Master Greatest Common Divisor in Real Interviews

Greatest Common Divisor Interview Questions

Related Topics

Find the Number of Subsequences With Equal GCD

Count Array Pairs Divisible by K

Max Points on a Line

Greatest Common Divisor of Strings

Reaching Points

Water and Jug Problem

Minimum Deletions to Make Array Divisible

Replace Non-Coprime Numbers in Array

Number of Different Subsequences GCDs

GCD Sort of an Array

X of a Kind in a Deck of Cards

Simplified Fractions

Number of Common Factors

Sorted GCD Pair Queries

Minimum Number of Operations to Make All Array Elements Equal to 1

Find Greatest Common Divisor of Array

Fraction Addition and Subtraction

Mirror Reflection

Check If It Is a Good Array

Ugly Number III

Distinct Prime Factors of Product of Array

Master Greatest Common Divisor in Real Interviews