Hash Table

11 questions

1Happy NumberEasy

Hash TableMathTwo Pointers

2Integer to RomanMedium

Hash TableMathString

3LRU CacheMedium

Hash TableLinked ListDesign

4Minimum Window SubstringHard

Hash TableStringSliding Window

5Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

6Happy NumberEasy

Hash TableMathTwo Pointers

7Integer to RomanMedium

Hash TableMathString

8Minimum Window SubstringHard

Hash TableStringSliding Window

9LRU CacheMedium

Hash TableLinked ListDesign

10Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

11Design TwitterMedium

Hash TableLinked ListDesign