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String

60 questions

1Minimum Remove to Make Valid ParenthesesMedium

StringStack

2Valid ParenthesesEasy

StringStack

3Simplify PathMedium

StringStack

4Longest Common PrefixEasy

StringTrie

5Minimum Add to Make Parentheses ValidMedium

StringStackGreedy

6Remove Invalid ParenthesesHard

StringBacktrackingBreadth-First Search

7Valid NumberHard

String

8String to Integer (atoi)Medium

String

9Valid Palindrome IIIHard

StringDynamic Programming

10Decode StringMedium

StringStackRecursion

11Goat LatinEasy

String

12Remove All Adjacent Duplicates in String IIMedium

StringStack

13Minimum Remove to Make Valid ParenthesesMedium

StringStack

14Simplify PathMedium

StringStack

15Minimum Add to Make Parentheses ValidMedium

StringStackGreedy

16Valid ParenthesesEasy

StringStack

17Valid NumberHard

String

18Longest Common PrefixEasy

StringTrie

19String to Integer (atoi)Medium

String

20Valid Palindrome IIIHard

StringDynamic Programming

21Goat LatinEasy

String

22Count and SayMedium

String

23Simplify PathMedium

StringStack

24Valid NumberHard

String

25Valid ParenthesesEasy

StringStack

26Longest Common PrefixEasy

StringTrie

27String to Integer (atoi)Medium

String

28Generate ParenthesesMedium

StringDynamic ProgrammingBacktracking

29Count and SayMedium

String

30Palindrome PartitioningMedium

StringDynamic ProgrammingBacktracking

31Regular Expression MatchingHard

StringDynamic ProgrammingRecursion

32Edit DistanceMedium

StringDynamic Programming

33Simplify PathMedium

StringStack

34Valid ParenthesesEasy

StringStack

35Valid NumberHard

String

36Longest Common PrefixEasy

StringTrie

37String to Integer (atoi)Medium

String

38Count and SayMedium

String

39Regular Expression MatchingHard

StringDynamic ProgrammingRecursion

40Generate ParenthesesMedium

StringDynamic ProgrammingBacktracking

41Zigzag ConversionMedium

String

42Edit DistanceMedium

StringDynamic Programming

43Restore IP AddressesMedium

StringBacktracking

44Decode WaysMedium

StringDynamic Programming

45Longest Valid ParenthesesHard

StringDynamic ProgrammingStack

46Simplify PathMedium

StringStack

47Valid ParenthesesEasy

StringStack

48Valid NumberHard

String

49Longest Common PrefixEasy

StringTrie

50String to Integer (atoi)Medium

String

51Count and SayMedium

String

52Generate ParenthesesMedium

StringDynamic ProgrammingBacktracking

53Regular Expression MatchingHard

StringDynamic ProgrammingRecursion

54Decode WaysMedium

StringDynamic Programming

55Zigzag ConversionMedium

String

56Wildcard MatchingHard

StringDynamic ProgrammingGreedy

57Edit DistanceMedium

StringDynamic Programming

58Length of Last WordEasy

String

59Restore IP AddressesMedium

StringBacktracking

60Longest Valid ParenthesesHard

StringDynamic ProgrammingStack