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
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
17. Letter Combinations of a Phone Number	Solve	Medium	Airtel+34	Backtracking Hash Table+1
36. Valid Sudoku	Solve	Medium	Amazon+9	Array Hash Table+1
49. Group Anagrams	Solve	Medium	Adobe+23	Array Hash Table+2
73. Set Matrix Zeroes	Solve	Medium	Amazon+4	Array Hash Table+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
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
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
159. Longest Substring with At Most Two Distinct Characters	Solve	Medium	Amazon+1	Hash Table Sliding Window+1
166. Fraction to Recurring Decimal	Solve	Medium	Airbnb+3	Hash Table Math+1
187. Repeated DNA Sequences	Solve	Medium	Amazon+1	Bit Manipulation Hash Function+4
208. Implement Trie (Prefix Tree)	Solve	Medium	Amazon+8	Design Hash Table+2
229. Majority Element II	Solve	Medium	Accolite+21	Array Counting+2
244. Shortest Word Distance II	Solve	Medium	LinkedIn	Array Design+3
249. Group Shifted Strings	Solve	Medium	Facebook+1	Array Hash Table+1
264. Ugly Number II	Solve	Medium	Microsoft	Dynamic Programming Hash Table+2
267. Palindrome Permutation II	Solve	Medium	Cruise Automation+1	Backtracking Hash Table+1
288. Unique Word Abbreviation	Solve	Medium	Facebook+1	Array Design+2
291. Word Pattern II	Solve	Medium	Bolt+2	Backtracking Hash Table+1
299. Bulls and Cows	Solve	Medium	Facebook+1	Counting Hash Table+1
311. Sparse Matrix Multiplication	Solve	Medium	Amazon+3	Array Hash Table+1
314. Binary Tree Vertical Order Traversal	Solve	Medium	Amazon+3	Binary Tree Breadth-First Search+4
325. Maximum Size Subarray Sum Equals k	Solve	Medium	Amazon+1	Array Hash Table+1
340. Longest Substring with At Most K Distinct Characters	Solve	Medium	Amazon+1	Hash Table Sliding Window+1
347. Top K Frequent Elements	Solve	Medium	Adobe+9	Array Bucket Sort+6
348. Design Tic-Tac-Toe	Solve	Medium	Adobe+4	Array Design+3
353. Design Snake Game	Solve	Medium	Amazon+6	Array Design+3
355. Design Twitter	Solve	Medium	Amazon+2	Design Hash Table+2
356. Line Reflection	Solve	Medium	Yandex	Array Hash Table+1
379. Design Phone Directory	Solve	Medium	Amazon+1	Array Design+3
380. Insert Delete GetRandom O(1)	Solve	Medium	Affirm+8	Array Design+3
395. Longest Substring with At Least K Repeating Characters	Solve	Medium	Amazon+1	Divide and Conquer Hash Table+2
398. Random Pick Index	Solve	Medium	Amazon+2	Hash Table Math+2
421. Maximum XOR of Two Numbers in an Array	Solve	Medium	Adobe+1	Array Bit Manipulation+2
423. Reconstruct Original Digits from English	Solve	Medium	JPMorgan	Hash Table Math+1
424. Longest Repeating Character Replacement	Solve	Medium	Adobe+3	Hash Table Sliding Window+1
433. Minimum Genetic Mutation	Solve	Medium	Amazon+4	Breadth-First Search Hash Table+1
438. Find All Anagrams in a String	Solve	Medium	Adobe+9	Hash Table Sliding Window+1
442. Find All Duplicates in an Array	Solve	Medium	Adobe+4	Array Hash Table
447. Number of Boomerangs	Solve	Medium	Google	Array Hash Table+1
451. Sort Characters By Frequency	Solve	Medium	Amazon+4	Bucket Sort Counting+4
454. 4Sum II	Solve	Medium	Adobe+3	Array Hash Table
457. Circular Array Loop	Solve	Medium	Goldman Sachs	Array Hash Table+1
491. Non-decreasing Subsequences	Solve	Medium	Amazon+1	Array Backtracking+2