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Top 50 combinatorics Interview Questions

The most frequently asked combinatorics questions across all roles and companies, ranked by real interview frequency. Updated daily.

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1
RecursionStart here. 6 questions · ~150 min
Stairs Routes CountingMedium
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Recently asked

Count stair-climbing routes using dynamic programming for one-step and two-step moves.

RecursioncombinatoricsDynamic ProgrammingCisco Restaurant + BarAdobeCisco
Generate All SubsetsMedium
Practice

Generate the power set of distinct elements using backtracking, including the empty subset.

RecursioncombinatoricsBit ManipulationScribdChewyCurrent (NY)
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2
combinatorics41 questions · ~1025 min
Go Handshakes MathEasy
Practice

Calculate unique pairwise handshakes across multiple conference phases using combinatorial counting.

combinatoricsCapgemini Government SolutionsCapgemini FSSBU
Pascal Triangle Row OutputMedium
Practice

Generate the nth Pascal triangle row using binomial coefficients with O(n) time and O(n) output space.

combinatoricsArraysAlgorithmsCConstant ContactHandshake
Pascal's Triangle PrintingMedium
Practice
Recently asked

Build Pascal's Triangle row by row using adjacent values from the previous row.

combinatoricsArraysAlgorithmsProvidenceProvidence India
Distinct Ways to Reach TopMedium
Practice
Recently asked

Count ordered ways to complete an AWS Step Functions workflow using allowed step sizes with dynamic programming.

combinatoricsDynamic ProgrammingAmazon Services
Dialpad Permutations CountMedium
Practice
Recently asked

Count ordered dialpad codes of a given length using exponentiation, allowing repeated symbols.

combinatoricsArray ManipulationAlgorithmsGoogle
Longest Palindrome RearrangementMedium
Practice
Recently asked

Build the lexicographically smallest longest palindrome by counting and rearranging input characters.

combinatoricsArraysstring manipulationU.S. Bank National AssociationTTD
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3
More topics3 questions · ~75 min
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