PrepCode

String

781 problems

Algorithms pattern questions across top companies

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#3Longest Substring Without Repeating CharactersMediumhash tableNeetCodeAccentureAccoliteAdobe
#5Longest Palindromic SubstringMediumtwo pointersNeetCodeAccentureAccoliteAdobe
#6Zigzag ConversionMediumstringWalkCCCAmazonAppleBloomberg
#8String to Integer (atoi)MediumstringNeetCodeAccentureAdobeAmazon
#10Regular Expression MatchingHardstringNeetCodeAccentureAirbnbAmazon
#12Integer to RomanMediumhash tableWalkCCCAMDAdobeAgoda
#13Roman to IntegerEasyhash tableNeetCodeAMDAccentureAdobe
#14Longest Common PrefixEasyarrayNeetCodeAccentureAdobeAmazon
#20Valid ParenthesesEasystringNeetCodeAMDAccoliteAdobe
#22Generate ParenthesesMediumstringNeetCodeAdobeAmazonApple
#28Find the Index of the First Occurrence in a StringEasytwo pointersWalkCCCAmazonAppleBloomberg
#32Longest Valid ParenthesesHardstringWalkCCCAccentureAmazonBloomberg
#38Count and SayMediumstringWalkCCCAmazonBloombergExpedia
#43Multiply StringsMediummathNeetCodeAmazonBloombergByteDance
#49Group AnagramsMediumarrayNeetCodeAccentureAccoliteAdobe
#65Valid NumberHardstringWalkCCCAmazonBloombergGoogle
#68Text JustificationHardarrayWalkCCCAirbnbAmazonApple
#71Simplify PathMediumstringNeetCodeAmazonArista NetworksBloomberg
#76Minimum Window SubstringHardhash tableNeetCodeAdobeAirbnbAmazon
#79Word SearchMediumarrayNeetCodeAccentureAmazonApple
#93Restore IP AddressesMediumstringWalkCCCAdobeAmazonApple
#115Distinct SubsequencesHardstringNeetCodeAmazonBloombergCoupang
#125Valid PalindromeEasytwo pointersNeetCodeAccentureAdobeAltimetrik
#127Word LadderHardhash tableNeetCodeAdobeAmazonApple
#139Word BreakMediumarrayNeetCodeAmazonAppleArista Networks
#151Reverse Words in a StringMediumtwo pointersWalkCCCAccentureAmazonApple
#168Excel Sheet Column TitleEasymathNeetCodeAccentureAmazonBloomberg
#179Largest NumberMediumarrayWalkCCCAccentureAdobeAmazon
#205Isomorphic StringsEasyhash tableWalkCCCAccentureAmazonAmerican Express
#208Implement Trie (Prefix Tree)Mediumhash tableNeetCodeAmazonAppleBloomberg
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