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Hash Table

28 questions

1Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

2Happy NumberEasy

Hash TableMathTwo Pointers

3Letter Combinations of a Phone NumberMedium

Hash TableStringBacktracking

4Roman to IntegerEasy

Hash TableMathString

5Valid AnagramEasy

Hash TableStringSorting

6Permutation Difference between Two StringsEasy

Hash TableString

7Sort Characters By FrequencyMedium

Hash TableStringSorting

8Integer to RomanMedium

Hash TableMathString

9Find All Anagrams in a StringMedium

Hash TableStringSliding Window

10Maximum Number of Balls in a BoxEasy

Hash TableMathCounting

11Find the DifferenceEasy

Hash TableStringBit Manipulation

12Longest PalindromeEasy

Hash TableStringGreedy

13First Unique Character in a StringEasy

Hash TableStringQueue

14Linked List CycleEasy

Hash TableLinked ListTwo Pointers

15Permutation Difference between Two StringsEasy

Hash TableString

16Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

17Happy NumberEasy

Hash TableMathTwo Pointers

18Letter Combinations of a Phone NumberMedium

Hash TableStringBacktracking

19Roman to IntegerEasy

Hash TableMathString

20Valid AnagramEasy

Hash TableStringSorting

21Sort Characters By FrequencyMedium

Hash TableStringSorting

22Integer to RomanMedium

Hash TableMathString

23Maximum Number of Balls in a BoxEasy

Hash TableMathCounting

24Find the DifferenceEasy

Hash TableStringBit Manipulation

25Find All Anagrams in a StringMedium

Hash TableStringSliding Window

26First Unique Character in a StringEasy

Hash TableStringQueue

27Longest PalindromeEasy

Hash TableStringGreedy

28Linked List CycleEasy

Hash TableLinked ListTwo Pointers