Problems

3,898+ problems · 938 Easy · 2039 Medium · 921 Hard

Title	Solution	Practice	Difficulty	Companies	Topics
151. Reverse Words in a String	Solution	Solve	Medium	Accenture+29	String Two Pointers
152. Maximum Product Subarray	Solution	Solve	Medium	Adobe+20	Array Dynamic Programming
153. Find Minimum in Rotated Sorted Array	Solution	Solve	Medium	Amazon+17	Array Binary Search
154. Find Minimum in Rotated Sorted Array II	Solution	Solve	Hard	Amazon+3	Array Binary Search
155. Min Stack	Solution	Solve	Medium	Adobe+35	Design Stack
156. Binary Tree Upside Down	Solution	Solve	Medium	Google+1	Binary Tree Depth-First Search+1
157. Read N Characters Given Read4	Solution	Solve	Easy	Apple+3	Array Interactive+1
158. Read N Characters Given read4 II - Call Multiple Times	Solution	Solve	Hard	Apple+4	Array Interactive+1
159. Longest Substring with At Most Two Distinct Characters	Solution	Solve	Medium	Amazon+4	Hash Table Sliding Window+1
160. Intersection of Two Linked Lists	Solution	Solve	Easy	Accenture+14	Hash Table Linked List+1
161. One Edit Distance	Solution	Solve	Medium	Meta+5	String Two Pointers
162. Find Peak Element	Solution	Solve	Medium	Accenture+33	Array Binary Search
163. Missing Ranges	Solution	Solve	Easy	Apple+2	Array
164. Maximum Gap	Solution	Solve	Medium	Amazon+6	Array Bucket Sort+2
165. Compare Version Numbers	Solution	Solve	Medium	Amazon+9	String Two Pointers
166. Fraction to Recurring Decimal	Solution	Solve	Medium	Amazon+9	Hash Table Math+1
167. Two Sum II - Input Array Is Sorted	Solution	Solve	Medium	Adobe+16	Array Binary Search+1
168. Excel Sheet Column Title	Solution	Solve	Easy	Amazon+7	Math String
169. Majority Element	Solution	Solve	Easy	Accenture+21	Array Counting+3
170. Two Sum III - Data structure design	Solution	Solve	Easy	Amazon+1	Array Data Stream+3
171. Excel Sheet Column Number	Solution	Solve	Easy	Adobe+9	Math String
172. Factorial Trailing Zeroes	Solution	Solve	Medium	Amazon+5	Math
173. Binary Search Tree Iterator	Solution	Solve	Medium	Adobe+8	Binary Search Tree Binary Tree+4
174. Dungeon Game	Solution	Solve	Hard	Amazon+7	Array Dynamic Programming+1
175. Combine Two Tables	Solution	Solve	Easy	Amazon+5	Database
176. Second Highest Salary	Solution	Solve	Medium	Accenture+18	Database
177. Nth Highest Salary	Solution	Solve	Medium	Accenture+9	Database
178. Rank Scores	Solution	Solve	Medium	Accenture+5	Database
179. Largest Number	Solution	Solve	Medium	Accenture+23	Array Greedy+2
180. Consecutive Numbers	Solution	Solve	Medium	Amazon+7	Database
181. Employees Earning More Than Their Managers	Solution	Solve	Easy	Accenture+10	Database
182. Duplicate Emails	Solution	Solve	Easy	Amazon+6	Database
183. Customers Who Never Order	Solution	Solve	Easy	Amazon+5	Database
184. Department Highest Salary	Solution	Solve	Medium	Amazon+8	Database
185. Department Top Three Salaries	Solution	Solve	Hard	Accenture+11	Database
186. Reverse Words in a String II	Solution	Solve	Medium	Amazon+3	String Two Pointers
187. Repeated DNA Sequences	Solution	Solve	Medium	Amazon+6	Bit Manipulation Hash Function+4
188. Best Time to Buy and Sell Stock IV	Solution	Solve	Hard	Amazon+10	Array Dynamic Programming
189. Rotate Array	Solution	Solve	Medium	Accenture+29	Array Math+1
190. Reverse Bits	Solution	Solve	Easy	Accenture+9	Bit Manipulation Divide and Conquer
191. Number of 1 Bits	Solution	Solve	Easy	Amazon+9	Bit Manipulation Divide and Conquer
192. Word Frequency	Solution	Solve	Medium	Bloomberg+3	Shell
193. Valid Phone Numbers	Solution	Solve	Easy	Amazon+2	Shell
194. Transpose File	Solution	Solve	Medium	Google+1	Shell
195. Tenth Line	Solution	Solve	Easy	Adobe+2	Shell
196. Delete Duplicate Emails	Solution	Solve	Easy	Amazon+8	Database
197. Rising Temperature	Solution	Solve	Easy	Accenture+11	Database
198. House Robber	Solution	Solve	Medium	Accenture+37	Array Dynamic Programming
199. Binary Tree Right Side View	Solution	Solve	Medium	Accenture+15	Binary Tree Breadth-First Search+2
200. Number of Islands	Solution	Solve	Medium	Accenture+86	Array Breadth-First Search+3