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Hash Table DSA Problems

Hash Table is an important concept in data structures and algorithms. Practice these problems to master Hash Table and prepare for technical interviews.

645

Total Problems

158

Easy

383

Medium

104

Hard

Status

Title

Video

Practice

Solve

Difficulty

Companies

Topics

EasyAccenture +29Array +154.3073%

Easy

Array Hash Table

3. Longest Substring Without Repeating Characters

MediumAdobe +20Hash Table +235.8029%

3. Longest Substring Without Repeating Characters

Medium

Hash Table Sliding Window+1

12. Integer to Roman

MediumAdobe +8Hash Table +266.9068%

12. Integer to Roman

Medium

Hash Table Math+1

13. Roman to Integer

EasyAccenture +18Hash Table +263.318%

13. Roman to Integer

Easy

Hash Table Math+1

17. Letter Combinations of a Phone Number

MediumAirtel +34Backtracking +262.3296%

17. Letter Combinations of a Phone Number

Medium

Backtracking Hash Table+1

30. Substring with Concatenation of All Words

HardAmazon +4Hash Table +232.5685%

30. Substring with Concatenation of All Words

Hard

Hash Table Sliding Window+1

36. Valid Sudoku

MediumAmazon +9Array +261.0174%

36. Valid Sudoku

Medium

Array Hash Table+1

37. Sudoku Solver

HardAdobe +11Array +363.4749%

37. Sudoku Solver

Hard

Array Backtracking+2

41. First Missing Positive

HardAdobe +7Array +140.2196%

41. First Missing Positive

Hard

Array Hash Table

49. Group Anagrams

MediumAdobe +23Array +369.7922%

49. Group Anagrams

Medium

Array Hash Table+2

73. Set Matrix Zeroes

MediumAmazon +4Array +258.0679%

73. Set Matrix Zeroes

Medium

Array Hash Table+1

76. Minimum Window Substring

HardAdobe +9Hash Table +244.1045%

76. Minimum Window Substring

Hard

Hash Table Sliding Window+1

105. Construct Binary Tree from Preorder and Inorder Traversal

MediumAmazon +5Array +465.4749%

105. Construct Binary Tree from Preorder and Inorder Traversal

Medium

Array Binary Tree+3

106. Construct Binary Tree from Inorder and Postorder Traversal

MediumShopeeArray +464.8575%

106. Construct Binary Tree from Inorder and Postorder Traversal

Medium

Array Binary Tree+3

126. Word Ladder II

HardAmazon +4Backtracking +327.123%

126. Word Ladder II

Hard

Backtracking Breadth-First Search+2

127. Word Ladder

HardAdobe +8Breadth-First Search +240.9815%

127. Word Ladder

Hard

Breadth-First Search Hash Table+1

128. Longest Consecutive Sequence

MediumAdobe +9Array +247.6455%

128. Longest Consecutive Sequence

Medium

Array Hash Table+1

133. Clone Graph

MediumAmazon +5Breadth-First Search +360.0334%

133. Clone Graph

Medium

Breadth-First Search Depth-First Search+2

138. Copy List with Random Pointer

MediumAditya Birla group +30Hash Table +158.4576%

138. Copy List with Random Pointer

Medium

Aditya Birla group+30

Hash Table Linked List

139. Word Break

MediumAccenture +38Array +547.5075%

139. Word Break

Medium

Array Dynamic Programming+4

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