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Top 50 Array Manipulation Interview Questions

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

50questions
~21htotal time
183companies covered
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1
Array ManipulationStart here. 3 questions · ~75 min
Rotate Array by KEasy
Practice
Recently asked

Rotate an array right by k positions using the three-reversal technique in O(n) time and O(1) extra space.

Array ManipulationHHexawareHexaware TechnologiesFreshworks
Rotate Square Matrix In PlaceEasy
Practice
Recently asked

Rotate an n x n matrix 90 degrees clockwise in place using transpose and row reversal.

Array ManipulationMatrixCapital OneRe:Build Manufacturing22nd Century Technologies
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2
string manipulation3 questions · ~75 min
String and Array ManipulationMedium
Practice

Reverse ASCII letters and digits while preserving punctuation, then reverse an integer array in place.

string manipulationArray ManipulationVericastPlanned Systems InternationalCalamos Investments
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3
Hash Tables4 questions · ~100 min
Finding Duplicates in an ArrayMedium
Practice
Recently asked

Use a hash set to find each duplicated array value once in O(n) time.

Hash TablesdeduplicationArraysAutomatic Data ProcessingADPArrow International
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4
Math5 questions · ~125 min
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5
Arrays14 questions · ~350 min
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6
Recursion4 questions · ~100 min
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7
More topics17 questions · ~425 min
Merge Overlapping Sorted IntervalsMedium
Practice
Recently asked

Sort intervals by start time, then greedily merge overlaps into a non-overlapping result array.

intervalsSortingArray ManipulationPlumAllscriptsTwitch
Reverse Words in SentenceMedium
Practice
Recently asked

Reverse each word's characters while preserving the sentence's word order using a linear scan.

coding challengeBasic AlgorithmsStringsAmerican AirlinesPocket FmBBestPeers Infosystem
Flatten Nested DataHard
Practice
Recently asked

Flatten nested dictionaries and arrays into dot-delimited paths using iterative depth-first traversal.

Data StructuresArray ManipulationJPMorganChaseLinkedInProgramming
Reverse a String Without Built-insEasy
Practice
Recently asked

Reverse a string character by character without using built-in reverse methods.

CodingjavascriptStringsAir AppsRBCItlize Global
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