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Top 50 space complexity Interview Questions

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

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CodingStart here. 47 questions · ~702 min
Analyze Time and Space ComplexityMedium
Practice
Recently asked

Explain the time and auxiliary space complexity of duplicate detection using a hash set.

space complexitytime complexityArraysWestern DigitalCCodingmart TechnologiesEnterprise Products
Repeated Element in ArrayMedium
Practice
Recently asked

Find the repeated number in an array using O(1) extra space.

space complexityArraysNextdoor
Sparse Bit Array OnesMedium
Practice
Recently asked

Scan a sparse bit array iteratively and return every index containing 1 using constant auxiliary space.

space complexityBit ManipulationArraysGoogle
Optimize Nested Loop CodeHard
Practice
Recently asked

Analyze the time and space complexity of nested loops and suggest practical optimizations.

space complexitycode analysisCodingAsana
C Basics, Pointers, and Space OptimizationMedium
Practice
Recently asked

Find the smallest missing positive integer in an unsorted array, then optimize the solution to O(1) auxiliary space.

c/c++space complexityArraysArista Networks
Block-Wise Entropy With O(1) SpaceHard
Practice
Recently asked

Compute empirical entropy for contiguous signal blocks using constant auxiliary space and no frequency map.

space complexityOpenAI
Optimize Code ComplexityMedium
Practice

Optimize Roku show filtering by removing deep cloning, reusing normalized input, and avoiding unnecessary genre scans.

space complexityclean codetime complexityRoku
Optimized Level-Order TraversalMedium
Practice
Recently asked

Traverse a binary tree level by level using BFS while limiting auxiliary space to the tree's maximum width.

space complexitybfsData StructuresWalmart Supply Chain
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