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Hash Table

TCS NQT Prep • 36 items

1First Unique Character in a StringEasy

Hash TableStringQueue

2First Unique Character in a StringEasy

Hash TableStringQueue

3Valid AnagramEasy

Hash TableStringSorting

4Valid AnagramEasy

Hash TableStringSorting

5Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

6First Unique Character in a StringEasy

Hash TableStringQueue

7Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

8Valid AnagramEasy

Hash TableStringSorting

9Roman to IntegerEasy

Hash TableMathString

10Happy NumberEasy

Hash TableMathTwo Pointers

11First Unique Character in a StringEasy

Hash TableStringQueue

12Remove Letter To Equalize FrequencyEasy

Hash TableStringCounting

13Letter Combinations of a Phone NumberMedium

Hash TableStringBacktracking

14Permutation in StringMedium

Hash TableTwo PointersString

15Linked List Cycle IIMedium

Hash TableLinked ListTwo Pointers

16LRU CacheMedium

Hash TableLinked ListDesign

17Longest Balanced Substring IIMedium

Hash TableStringPrefix Sum

18Smallest Integer Divisible by KMedium

Hash TableMath

19Integer to RomanMedium

Hash TableMathString

20Valid AnagramEasy

Hash TableStringSorting

21Longest Substring Without Repeating CharactersMedium

Hash TableStringSliding Window

22Remove Letter To Equalize FrequencyEasy

Hash TableStringCounting

23First Unique Character in a StringEasy

Hash TableStringQueue

24Roman to IntegerEasy

Hash TableMathString

25Happy NumberEasy

Hash TableMathTwo Pointers

26Letter Combinations of a Phone NumberMedium

Hash TableStringBacktracking

27LRU CacheMedium

Hash TableLinked ListDesign

28Linked List CycleEasy

Hash TableLinked ListTwo Pointers

29Permutation in StringMedium

Hash TableTwo PointersString

30Linked List Cycle IIMedium

Hash TableLinked ListTwo Pointers

31Smallest Integer Divisible by KMedium

Hash TableMath

32Longest Balanced Substring IIMedium

Hash TableStringPrefix Sum

33Integer to RomanMedium

Hash TableMathString

34Longest PalindromeEasy

Hash TableStringGreedy

35Intersection of Two Linked ListsEasy

Hash TableLinked ListTwo Pointers

36Word LadderHard

Hash TableStringBreadth-First Search