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Problems

975 problems

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Array447String249Hash Table190Math173Database113Sorting100Simulation93Counting70Two Pointers70Bit Manipulation54Greedy51Matrix41Tree40Depth-First Search39Binary Tree37All topics

Easy · 975 results

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TitleSolutionAcceptDifficultyTopics
1. Two SumVideo
Solution57.8%Easy
Array, Hash Table· 127 companies
9. Palindrome NumberVideo
Solution61.0%Easy
Math· 31 companies
13. Roman to IntegerVideo
Solution67.0%Easy
Hash Table, Math +1· 36 companies
14. Longest Common PrefixVideo
Solution48.6%Easy
String, Trie· 60 companies
20. Valid ParenthesesVideo
Solution45.2%Easy
Stack, String· 113 companies
21. Merge Two Sorted ListsVideo
Solution68.7%Easy
Linked List, Recursion· 36 companies
26. Remove Duplicates from Sorted ArrayVideo
Solution63.7%Easy
Array, Two Pointers· 26 companies
27. Remove ElementVideo
Solution62.2%Easy
Array, Two Pointers· 10 companies
28. Find the Index of the First Occurrence in a StringVideo
Solution47.0%Easy
String, String Matching +1· 16 companies
35. Search Insert PositionVideo
Solution52.1%Easy
Array, Binary Search· 12 companies
58. Length of Last WordVideo
Solution59.7%Easy
String· 7 companies
66. Plus OneVideo
Solution50.3%Easy
Array, Math· 13 companies
67. Add BinaryVideo
Solution58.4%Easy
Bit Manipulation, Math +2· 17 companies
69. Sqrt(x)Video
Solution42.2%Easy
Binary Search, Math· 17 companies
70. Climbing StairsVideo
Solution54.0%Easy
Dynamic Programming, Math +1· 37 companies
83. Remove Duplicates from Sorted ListVideo
Solution57.6%Easy
Linked List· 9 companies
88. Merge Sorted ArrayVideo
Solution55.7%Easy
Array, Sorting +1· 37 companies
94. Binary Tree Inorder TraversalVideo
Solution80.4%Easy
Binary Tree, Depth-First Search +2· 7 companies
100. Same TreeVideo
Solution68.0%Easy
Binary Tree, Breadth-First Search +2· 9 companies
101. Symmetric TreeVideo
Solution62.1%Easy
Binary Tree, Breadth-First Search +2· 11 companies
104. Maximum Depth of Binary TreeVideo
Solution78.6%Easy
Binary Tree, Breadth-First Search +2· 17 companies
108. Convert Sorted Array to Binary Search TreeVideo
Solution75.9%Easy
Array, Binary Search Tree +3· 9 companies
110. Balanced Binary TreeVideo
Solution59.2%Easy
Binary Tree, Depth-First Search +1· 9 companies
111. Minimum Depth of Binary TreeVideo
Solution53.7%Easy
Binary Tree, Breadth-First Search +2· 7 companies
112. Path SumVideo
Solution55.8%Easy
Binary Tree, Breadth-First Search +2· 9 companies
118. Pascal's TriangleVideo
Solution79.4%Easy
Array, Dynamic Programming· 17 companies
119. Pascal's Triangle IIVideo
Solution67.8%Easy
Array, Dynamic Programming· 6 companies
121. Best Time to Buy and Sell StockVideo
Solution57.1%Easy
Array, Dynamic Programming· 92 companies
125. Valid PalindromeVideo
Solution54.2%Easy
String, Two Pointers· 39 companies
136. Single NumberVideo
Solution78.1%Easy
Array, Bit Manipulation· 15 companies
141. Linked List CycleVideo
Solution55.2%Easy
Hash Table, Linked List +1· 24 companies
144. Binary Tree Preorder TraversalVideo
Solution76.6%Easy
Binary Tree, Depth-First Search +2· 5 companies
145. Binary Tree Postorder TraversalVideo
Solution79.0%Easy
Binary Tree, Depth-First Search +2· 5 companies
157. Read N Characters Given Read4VideoPremium
Solution42.5%Easy
Array, Interactive +1· 3 companies
160. Intersection of Two Linked ListsVideo
Solution64.6%Easy
Hash Table, Linked List +1· 13 companies
163. Missing RangesVideoPremium
Solution35.5%Easy
Array· 2 companies
168. Excel Sheet Column TitleVideo
Solution47.9%Easy
Math, String· 10 companies
169. Majority ElementVideo
Solution66.2%Easy
Array, Counting +3· 22 companies
170. Two Sum III - Data structure designVideoPremium
Solution39.1%Easy
Array, Data Stream +3· 2 companies
171. Excel Sheet Column NumberVideo
Solution68.6%Easy
Math, String· 9 companies
175. Combine Two TablesVideo
Solution80.1%Easy
Database· 8 companies
181. Employees Earning More Than Their ManagersVideo
Solution74.0%Easy
Database· 10 companies
182. Duplicate EmailsVideo
Solution74.6%Easy
Database· 7 companies
183. Customers Who Never OrderVideo
Solution72.6%Easy
Database· 6 companies
190. Reverse BitsVideo
Solution69.2%Easy
Bit Manipulation, Divide and Conquer· 9 companies
191. Number of 1 BitsVideo
Solution77.7%Easy
Bit Manipulation, Divide and Conquer· 11 companies
193. Valid Phone NumbersVideo
Solution26.6%Easy
Shell· 4 companies
195. Tenth LineVideo
Solution33.8%Easy
Shell· 4 companies
196. Delete Duplicate EmailsVideo
Solution67.1%Easy
Database· 9 companies
197. Rising TemperatureVideo
Solution52.4%Easy
Database· 12 companies
Showing 1–50 of 975