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
1001. Grid Illumination	Solve	Hard	Dropbox	Array Hash Table
1002. Find Common Characters	Solve	Easy	Amazon	Array Hash Table+1
1010. Pairs of Songs With Total Durations Divisible by 60	Solve	Medium	Amazon+7	Array Counting+1
1015. Smallest Integer Divisible by K	Solve	Medium	Google	Hash Table Math
1027. Longest Arithmetic Subsequence	Solve	Medium	Google+2	Array Binary Search+2
1036. Escape a Large Maze	Solve	Hard	Apple+2	Array Breadth-First Search+2
1048. Longest String Chain	Solve	Medium	Facebook+4	Array Dynamic Programming+4
1054. Distant Barcodes	Solve	Medium	Amazon	Array Counting+4
1072. Flip Columns For Maximum Number of Equal Rows	Solve	Medium	-	Array Hash Table+1
1074. Number of Submatrices That Sum to Target	Solve	Hard	Amazon+2	Array Hash Table+2
1079. Letter Tile Possibilities	Solve	Medium	Google+1	Backtracking Counting+2
1086. High Five	Solve	Easy	Goldman Sachs	Array Hash Table+2
1090. Largest Values From Labels	Solve	Medium	Google	Array Counting+3
1100. Find K-Length Substrings With No Repeated Characters	Solve	Medium	Amazon	Hash Table Sliding Window+1
1110. Delete Nodes And Return Forest	Solve	Medium	Facebook+3	Array Binary Tree+3
1122. Relative Sort Array	Solve	Easy	Google	Array Counting Sort+2
1123. Lowest Common Ancestor of Deepest Leaves	Solve	Medium	Amazon+1	Binary Tree Breadth-First Search+3
1124. Longest Well-Performing Interval	Solve	Medium	Infosys	Array Hash Table+3
1128. Number of Equivalent Domino Pairs	Solve	Easy	Adobe+1	Array Counting+1
1133. Largest Unique Number	Solve	Easy	Amazon	Array Hash Table+1
1138. Alphabet Board Path	Solve	Medium	Amazon	Hash Table String
1146. Snapshot Array	Solve	Medium	Google+2	Array Binary Search+2
1152. Analyze User Website Visit Pattern	Solve	Medium	Amazon+1	Array Hash Table+1
1153. String Transforms Into Another String	Solve	Hard	Amazon+4	Hash Table String
1156. Swap For Longest Repeated Character Substring	Solve	Medium	Microsoft+1	Hash Table Sliding Window+1
1160. Find Words That Can Be Formed by Characters	Solve	Easy	Amazon+3	Array Counting+2
1165. Single-Row Keyboard	Solve	Easy	Google	Hash Table String
1166. Design File System	Solve	Medium	Google	Design Hash Table+2
1169. Invalid Transactions	Solve	Medium	Amazon+2	Array Hash Table+2
1170. Compare Strings by Frequency of the Smallest Character	Solve	Medium	Google	Array Binary Search+3
1171. Remove Zero Sum Consecutive Nodes from Linked List	Solve	Medium	Amazon	Hash Table Linked List
1172. Dinner Plate Stacks	Solve	Hard	-	Design Hash Table+2
1177. Can Make Palindrome from Substring	Solve	Medium	Akuna Capital	Array Bit Manipulation+3
1178. Number of Valid Words for Each Puzzle	Solve	Hard	Dropbox	Array Bit Manipulation+3
1181. Before and After Puzzle	Solve	Medium	Clutter	Array Hash Table+2
1189. Maximum Number of Balloons	Solve	Easy	Adobe	Counting Hash Table+1
1198. Find Smallest Common Element in All Rows	Solve	Medium	Walmart Global Tech	Array Binary Search+3
1202. Smallest String With Swaps	Solve	Medium	Amazon+3	Array Breadth-First Search+5
1207. Unique Number of Occurrences	Solve	Easy	Adobe+5	Array Hash Table
1213. Intersection of Three Sorted Arrays	Solve	Easy	Facebook	Array Binary Search+2
1218. Longest Arithmetic Subsequence of Given Difference	Solve	Medium	Facebook+2	Array Dynamic Programming+1
1224. Maximum Equal Frequency	Solve	Hard	American Express	Array Hash Table
1244. Design A Leaderboard	Solve	Medium	Amazon+4	Design Hash Table+1
1248. Count Number of Nice Subarrays	Solve	Medium	Adobe+3	Array Hash Table+3
1257. Smallest Common Region	Solve	Medium	Airbnb	Array Breadth-First Search+4
1258. Synonymous Sentences	Solve	Medium	Amazon+1	Array Backtracking+3
1261. Find Elements in a Contaminated Binary Tree	Solve	Medium	Google	Binary Tree Breadth-First Search+4
1275. Find Winner on a Tic Tac Toe Game	Solve	Easy	Amazon+4	Array Hash Table+2
1282. Group the People Given the Group Size They Belong To	Solve	Medium	Apple+3	Array Greedy+1
1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Solve	Hard	Airbnb+1	Array Bit Manipulation+3