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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
Practice
Recently asked

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

string manipulationDassault SystèmesAArctic WolfNXP Semiconductors
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
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 WindowGGina's Tech JobsCCDWaacceldata
Find Two Numbers That SumEasy
Practice
Recently asked

Find two array values that reach a target sum using a hash map in O(n) time.

api integrationstring manipulationfilteringMaerskEEmsyneCitigroup
Longest PalindromeMedium
Practice
Recently asked

Use center expansion to find the longest palindromic substring in a Sumo Logic log fragment.

Dynamic Programmingstring manipulationAmazon Lab126Pocket GemsFinacle
Reverse Words in a StringEasy
Practice
Recently asked

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

string manipulationAlgorithmsLeidosHHelmerich & PayneTencent
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
String and Array ManipulationMedium
Practice
Recently asked

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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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
Recently asked
Practice drill

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

data cleaningJoinsstring manipulationAdobe
DNA Sequence String ManipulationMedium
Practice
Practice drill

Clean, validate, and transform DNA strings while calculating sequence length, GC content, and reverse complements.

data cleaningData Manipulationstring manipulationScribd
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