Dashboard Questions Topics Companies Sheets

Data Structures & Algorithms

Practice 3,374+ coding problems from top companies. Master DSA concepts and ace your interviews.

3,374

Problems

840

Easy

1762

Medium

772

Hard

Difficulty

All3374 Easy840 Medium1762 Hard772

Title	Solve	Difficulty	Companies	Topics
151. Reverse Words in a String	Solve	Medium	Amazon+5	String Two Pointers
152. Maximum Product Subarray	Solve	Medium	Adobe+6	Array Dynamic Programming
153. Find Minimum in Rotated Sorted Array	Solve	Medium	Adobe+6	Array Binary Search
154. Find Minimum in Rotated Sorted Array II	Solve	Hard	Google	Array Binary Search
155. Min Stack	Solve	Medium	Adobe+7	Design Stack
156. Binary Tree Upside Down	Solve	Medium	LinkedIn	Binary Tree Depth-First Search+1
157. Read N Characters Given Read4	Solve	Easy	Amazon+4	Array Interactive+1
158. Read N Characters Given read4 II - Call Multiple Times	Solve	Hard	Facebook+3	Array Interactive+1
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
161. One Edit Distance	Solve	Medium	Facebook+2	String Two Pointers
162. Find Peak Element	Solve	Medium	Amazon+8	Array Binary Search
163. Missing Ranges	Solve	Easy	Facebook	Array
164. Maximum Gap	Solve	Medium	Amazon+1	Array Bucket Sort+2
165. Compare Version Numbers	Solve	Medium	Amazon+3	String Two Pointers
166. Fraction to Recurring Decimal	Solve	Medium	Airbnb+3	Hash Table Math+1
167. Two Sum II - Input Array Is Sorted	Solve	Medium	Adobe+5	Array Binary Search+1
168. Excel Sheet Column Title	Solve	Easy	Adobe+24	Math String
169. Majority Element	Solve	Easy	Adobe+8	Array Counting+3
170. Two Sum III - Data structure design	Solve	Easy	LinkedIn	Array Data Stream+3
171. Excel Sheet Column Number	Solve	Easy	Apple+2	Math String
172. Factorial Trailing Zeroes	Solve	Medium	Amazon+1	Math
173. Binary Search Tree Iterator	Solve	Medium	Amazon+5	Binary Search Tree Binary Tree+4
174. Dungeon Game	Solve	Hard	Amazon+1	Array Dynamic Programming+1
175. Combine Two Tables	Solve	Easy	Adobe+6	Database
176. Second Highest Salary	Solve	Medium	Accenture+10	Database
177. Nth Highest Salary	Solve	Medium	Adobe+2	Database
178. Rank Scores	Solve	Medium	Adobe+4	Database
179. Largest Number	Solve	Medium	Adobe+8	Array Greedy+2
180. Consecutive Numbers	Solve	Medium	Adobe+4	Database
181. Employees Earning More Than Their Managers	Solve	Easy	Amazon+7	Database
182. Duplicate Emails	Solve	Easy	Adobe+2	Database
183. Customers Who Never Order	Solve	Easy	Adobe+3	Database
184. Department Highest Salary	Solve	Medium	Adobe+3	Database
185. Department Top Three Salaries	Solve	Hard	Amazon+4	Database
186. Reverse Words in a String II	Solve	Medium	Microsoft	String Two Pointers
187. Repeated DNA Sequences	Solve	Medium	Amazon+1	Bit Manipulation Hash Function+4
188. Best Time to Buy and Sell Stock IV	Solve	Hard	Amazon+4	Array Dynamic Programming
189. Rotate Array	Solve	Medium	Amazon+6	Array Math+1
190. Reverse Bits	Solve	Easy	Apple+4	Bit Manipulation Divide and Conquer
191. Number of 1 Bits	Solve	Easy	Amazon+6	Bit Manipulation Divide and Conquer
192. Word Frequency	Solve	Medium	-	Shell
193. Valid Phone Numbers	Solve	Easy	-	Shell
194. Transpose File	Solve	Medium	-	Shell
195. Tenth Line	Solve	Easy	-	Shell
196. Delete Duplicate Emails	Solve	Easy	Amazon+3	Database
197. Rising Temperature	Solve	Easy	Adobe+5	Database
198. House Robber	Solve	Medium	Adobe+8	Array Dynamic Programming
199. Binary Tree Right Side View	Solve	Medium	Amazon+8	Binary Tree Breadth-First Search+2
200. Number of Islands	Solve	Medium	Adobe+40	Array Breadth-First Search+3