Dashboard Questions Topics Companies Sheets

Hash Table

Topic

645 coding problems covering Hash Table concepts. Master this topic and improve your problem-solving skills.

645

Problems

158

Easy

383

Medium

104

Hard

Difficulty

All645 Easy158 Medium383 Hard104

Title	Solve	Difficulty	Companies	Topics
1. Two Sum	Solve	Easy	Accenture+29	Array Hash Table
3. Longest Substring Without Repeating Characters	Solve	Medium	Adobe+20	Hash Table Sliding Window+1
12. Integer to Roman	Solve	Medium	Adobe+8	Hash Table Math+1
13. Roman to Integer	Solve	Easy	Accenture+18	Hash Table Math+1
17. Letter Combinations of a Phone Number	Solve	Medium	Airtel+34	Backtracking Hash Table+1
30. Substring with Concatenation of All Words	Solve	Hard	Amazon+4	Hash Table Sliding Window+1
36. Valid Sudoku	Solve	Medium	Amazon+9	Array Hash Table+1
37. Sudoku Solver	Solve	Hard	Adobe+11	Array Backtracking+2
41. First Missing Positive	Solve	Hard	Adobe+7	Array Hash Table
49. Group Anagrams	Solve	Medium	Adobe+23	Array Hash Table+2
73. Set Matrix Zeroes	Solve	Medium	Amazon+4	Array Hash Table+1
76. Minimum Window Substring	Solve	Hard	Adobe+9	Hash Table Sliding Window+1
105. Construct Binary Tree from Preorder and Inorder Traversal	Solve	Medium	Amazon+5	Array Binary Tree+3
106. Construct Binary Tree from Inorder and Postorder Traversal	Solve	Medium	Shopee	Array Binary Tree+3
126. Word Ladder II	Solve	Hard	Amazon+4	Backtracking Breadth-First Search+2
127. Word Ladder	Solve	Hard	Adobe+8	Breadth-First Search Hash Table+1
128. Longest Consecutive Sequence	Solve	Medium	Adobe+9	Array Hash Table+1
133. Clone Graph	Solve	Medium	Amazon+5	Breadth-First Search Depth-First Search+2
138. Copy List with Random Pointer	Solve	Medium	Aditya Birla group+30	Hash Table Linked List
139. Word Break	Solve	Medium	Accenture+38	Array Dynamic Programming+4
140. Word Break II	Solve	Hard	Adobe+7	Array Backtracking+5
141. Linked List Cycle	Solve	Easy	42gearMobilitySystems+131	Hash Table Linked List+1
142. Linked List Cycle II	Solve	Medium	Amazon+1	Hash Table Linked List+1
146. LRU Cache	Solve	Medium	Accolite+56	Design Doubly-Linked List+2
149. Max Points on a Line	Solve	Hard	Amazon+4	Array Geometry+2
159. Longest Substring with At Most Two Distinct Characters	Solve	Medium	Amazon+1	Hash Table Sliding Window+1
160. Intersection of Two Linked Lists	Solve	Easy	Adobe+7	Hash Table Linked List+1
166. Fraction to Recurring Decimal	Solve	Medium	Airbnb+3	Hash Table Math+1
169. Majority Element	Solve	Easy	Adobe+8	Array Counting+3
170. Two Sum III - Data structure design	Solve	Easy	LinkedIn	Array Data Stream+3
187. Repeated DNA Sequences	Solve	Medium	Amazon+1	Bit Manipulation Hash Function+4
202. Happy Number	Solve	Easy	Adobe+5	Hash Table Math+1
205. Isomorphic Strings	Solve	Easy	Amazon+2	Hash Table String
208. Implement Trie (Prefix Tree)	Solve	Medium	Amazon+8	Design Hash Table+2
217. Contains Duplicate	Solve	Easy	Adobe+8	Array Hash Table+1
219. Contains Duplicate II	Solve	Easy	Adobe+6	Array Hash Table+1
229. Majority Element II	Solve	Medium	Accolite+21	Array Counting+2
242. Valid Anagram	Solve	Easy	Affirm+8	Hash Table Sorting+1
244. Shortest Word Distance II	Solve	Medium	LinkedIn	Array Design+3
246. Strobogrammatic Number	Solve	Easy	Facebook+1	Hash Table String+1
249. Group Shifted Strings	Solve	Medium	Facebook+1	Array Hash Table+1
264. Ugly Number II	Solve	Medium	Microsoft	Dynamic Programming Hash Table+2
266. Palindrome Permutation	Solve	Easy	Facebook	Bit Manipulation Hash Table+1
267. Palindrome Permutation II	Solve	Medium	Cruise Automation+1	Backtracking Hash Table+1
268. Missing Number	Solve	Easy	Adobe+8	Array Binary Search+4
288. Unique Word Abbreviation	Solve	Medium	Facebook+1	Array Design+2
290. Word Pattern	Solve	Easy	Adobe+3	Hash Table String
291. Word Pattern II	Solve	Medium	Bolt+2	Backtracking Hash Table+1
299. Bulls and Cows	Solve	Medium	Facebook+1	Counting Hash Table+1
305. Number of Islands II	Solve	Hard	Google+1	Array Hash Table+1