Problems

3,947+ problems · 946 Easy · 2062 Medium · 939 Hard

Active:Easy· 946 results

Title	Solution	Practice	Difficulty	Companies	Topics
1. Two Sum	Solution	Solve	Easy	Accenture+128	Array Hash Table
9. Palindrome Number	Solution	Solve	Easy	Accenture+34	Math
13. Roman to Integer	Solution	Solve	Easy	Accenture+44	Hash Table Math+1
14. Longest Common Prefix	Solution	Solve	Easy	Accenture+56	String Trie
20. Valid Parentheses	Solution	Solve	Easy	Accenture+118	Stack String
21. Merge Two Sorted Lists	Solution	Solve	Easy	Adobe+39	Linked List Recursion
26. Remove Duplicates from Sorted Array	Solution	Solve	Easy	Accenture+27	Array Two Pointers
27. Remove Element	Solution	Solve	Easy	Adobe+9	Array Two Pointers
28. Find the Index of the First Occurrence in a String	Solution	Solve	Easy	Adobe+16	String String Matching+1
35. Search Insert Position	Solution	Solve	Easy	Accenture+13	Array Binary Search
58. Length of Last Word	Solution	Solve	Easy	Amazon+7	String
66. Plus One	Solution	Solve	Easy	Accenture+13	Array Math
67. Add Binary	Solution	Solve	Easy	Amazon+12	Bit Manipulation Math+2
69. Sqrt(x)	Solution	Solve	Easy	Adobe+18	Binary Search Math
70. Climbing Stairs	Solution	Solve	Easy	Accenture+37	Dynamic Programming Math+1
83. Remove Duplicates from Sorted List	Solution	Solve	Easy	Adobe+9	Linked List
88. Merge Sorted Array	Solution	Solve	Easy	Accenture+41	Array Sorting+1
94. Binary Tree Inorder Traversal	Solution	Solve	Easy	Amazon+5	Binary Tree Depth-First Search+2
100. Same Tree	Solution	Solve	Easy	Adobe+8	Binary Tree Breadth-First Search+2
101. Symmetric Tree	Solution	Solve	Easy	Amazon+11	Binary Tree Breadth-First Search+2
104. Maximum Depth of Binary Tree	Solution	Solve	Easy	Accenture+15	Binary Tree Breadth-First Search+2
108. Convert Sorted Array to Binary Search Tree	Solution	Solve	Easy	Accenture+9	Array Binary Search Tree+3
110. Balanced Binary Tree	Solution	Solve	Easy	Amazon+9	Binary Tree Depth-First Search+1
111. Minimum Depth of Binary Tree	Solution	Solve	Easy	Amazon+5	Binary Tree Breadth-First Search+2
112. Path Sum	Solution	Solve	Easy	Amazon+9	Binary Tree Breadth-First Search+2
118. Pascal's Triangle	Solution	Solve	Easy	Accenture+18	Array Dynamic Programming
119. Pascal's Triangle II	Solution	Solve	Easy	Amazon+5	Array Dynamic Programming
121. Best Time to Buy and Sell Stock	Solution	Solve	Easy	Accenture+103	Array Dynamic Programming
125. Valid Palindrome	Solution	Solve	Easy	Accenture+41	String Two Pointers
136. Single Number	Solution	Solve	Easy	Accenture+14	Array Bit Manipulation
141. Linked List Cycle	Solution	Solve	Easy	Accenture+24	Hash Table Linked List+1
144. Binary Tree Preorder Traversal	Solution	Solve	Easy	Amazon+5	Binary Tree Depth-First Search+2
145. Binary Tree Postorder Traversal	Solution	Solve	Easy	Amazon+4	Binary Tree Depth-First Search+2
157. Read N Characters Given Read4	Solution	Solve	Easy	Apple+3	Array Interactive+1
160. Intersection of Two Linked Lists	Solution	Solve	Easy	Accenture+14	Hash Table Linked List+1
163. Missing Ranges	Solution	Solve	Easy	Apple+2	Array
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
175. Combine Two Tables	Solution	Solve	Easy	Amazon+5	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
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
193. Valid Phone Numbers	Solution	Solve	Easy	Amazon+2	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