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Top 50 string manipulation Interview Questions

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

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1
CodingStart here. 49 questions · ~1220 min
Bubble Sort and String ReversalEasy
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Recently asked

Reverse a string using a two-pointer swap approach in linear time.

string manipulationDassault SystèmesAArctic WolfKeysight Technologies
In-Place String ReversalEasy
Practice
Recently asked

Implement in-place reversal and swapping without extra memory using two pointers or arithmetic/XOR.

string manipulationBoeingHealth Care Solutions At HomeSuperAGI
Reverse Words in a StringEasy
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Recently asked

Reverse the order of words in a report string while preserving each word and normalizing whitespace.

string manipulationAlgorithmsLeidosHHelmerich & PayneTencent
Longest PalindromeMedium
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Use center expansion to find the longest palindromic substring in a Sumo Logic log fragment.

Dynamic Programmingstring manipulationAmazon Lab126Pocket GemsSumo Logic
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
Count Character OccurrencesEasy
Practice
Recently asked

Count exact occurrences of a target character in a PlayStation message using a single string traversal.

string manipulationPlayStationKeysight TechnologiesMphasis
Longest Substring Without RepeatsMedium
Practice
Recently asked

Find the longest substring without repeated characters using a sliding window and last-seen index map.

coding challengestring manipulationSliding WindowaacceldataCodeSignalPhonepe
Anagram DetectionEasy
Practice
Recently asked

Determine whether two lowercase words are anagrams using a frequency map in O(n) time.

string manipulationMicrosoftTimes InternetBoston Children's Hospital
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More topics1 question · ~25 min
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Anagram Check With SQLMedium
Practice
Practice drill

Compare normalized character signatures to determine whether each pair of strings is an anagram.

data cleaningJoinsstring manipulationAdobe
Basic SQL and String ReverseEasy
Practice
Practice drill

Reverse Costar property search strings with PostgreSQL and flag rows whose stored expected value does not match.

sql queriesstring manipulationCostar
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