Talentd
For employersSign in
JobsInternshipsPracticeResume toolsCompaniesArticles
For employers
FleetCode
Make and follow sheets.Sign in

Problems

2,133 problems

Has videoPremium onlyReset
Array1,212Hash Table473String437Math331Greedy330Dynamic Programming327Sorting302Depth-First Search208Binary Search189Breadth-First Search166Matrix163Tree158Prefix Sum155Two Pointers150Database137All topics

Medium · 2,133 results

Sign in to see which of these you have solved.Sign in
TitleSolutionAcceptDifficultyTopics
82. Remove Duplicates from Sorted List IIVideo
Solution52.8%Medium
Linked List, Two Pointers· 11 companies
86. Partition ListVideo
Solution62.0%Medium
Linked List, Two Pointers· 5 companies
89. Gray CodeVideo
Solution66.2%Medium
Backtracking, Bit Manipulation +1· 5 companies
90. Subsets IIVideo
Solution61.7%Medium
Array, Backtracking +1· 9 companies
91. Decode WaysVideo
Solution38.3%Medium
Dynamic Programming, String· 22 companies
92. Reverse Linked List IIVideo
Solution52.4%Medium
Linked List· 16 companies
93. Restore IP AddressesVideo
Solution57.3%Medium
Backtracking, String· 20 companies
95. Unique Binary Search Trees IIVideo
Solution63.3%Medium
Backtracking, Binary Search Tree +3· 5 companies
96. Unique Binary Search TreesVideo
Solution64.0%Medium
Binary Search Tree, Binary Tree +3· 10 companies
97. Interleaving StringVideo
Solution45.0%Medium
Dynamic Programming, String· 10 companies
98. Validate Binary Search TreeVideo
Solution36.1%Medium
Binary Search Tree, Binary Tree +2· 18 companies
99. Recover Binary Search TreeVideo
Solution60.9%Medium
Binary Search Tree, Binary Tree +2· 8 companies
102. Binary Tree Level Order TraversalVideo
Solution73.5%Medium
Binary Tree, Breadth-First Search +1· 16 companies
103. Binary Tree Zigzag Level Order TraversalVideo
Solution64.4%Medium
Binary Tree, Breadth-First Search +1· 19 companies
105. Construct Binary Tree from Preorder and Inorder TraversalVideo
Solution69.7%Medium
Array, Binary Tree +3· 9 companies
106. Construct Binary Tree from Inorder and Postorder TraversalVideo
Solution69.4%Medium
Array, Binary Tree +3· 7 companies
107. Binary Tree Level Order Traversal IIVideo
Solution69.0%Medium
Binary Tree, Breadth-First Search +1· 6 companies
109. Convert Sorted List to Binary Search TreeVideo
Solution67.4%Medium
Binary Search Tree, Binary Tree +3· 9 companies
113. Path Sum IIVideo
Solution62.6%Medium
Backtracking, Binary Tree +2· 10 companies
114. Flatten Binary Tree to Linked ListVideo
Solution71.6%Medium
Binary Tree, Depth-First Search +3· 8 companies
116. Populating Next Right Pointers in Each NodeVideo
Solution67.6%Medium
Binary Tree, Breadth-First Search +3· 8 companies
117. Populating Next Right Pointers in Each Node IIVideo
Solution57.9%Medium
Binary Tree, Breadth-First Search +3· 7 companies
120. TriangleVideo
Solution59.9%Medium
Array, Dynamic Programming· 11 companies
122. Best Time to Buy and Sell Stock IIVideo
Solution71.4%Medium
Array, Dynamic Programming +1· 28 companies
128. Longest Consecutive SequenceVideo
Solution47.0%Medium
Array, Hash Table +1· 40 companies
129. Sum Root to Leaf NumbersVideo
Solution70.3%Medium
Binary Tree, Depth-First Search +1· 7 companies
130. Surrounded RegionsVideo
Solution46.1%Medium
Array, Breadth-First Search +3· 12 companies
131. Palindrome PartitioningVideo
Solution74.4%Medium
Backtracking, Dynamic Programming +1· 10 companies
133. Clone GraphVideo
Solution66.1%Medium
Breadth-First Search, Depth-First Search +2· 18 companies
134. Gas StationVideo
Solution48.4%Medium
Array, Greedy· 29 companies
137. Single Number IIVideo
Solution68.0%Medium
Array, Bit Manipulation· 5 companies
138. Copy List with Random PointerVideo
Solution63.8%Medium
Hash Table, Linked List· 22 companies
139. Word BreakVideo
Solution49.8%Medium
Array, Dynamic Programming +4· 32 companies
142. Linked List Cycle IIVideo
Solution59.3%Medium
Hash Table, Linked List +1· 13 companies
143. Reorder ListVideo
Solution66.0%Medium
Linked List, Recursion +2· 15 companies
146. LRU CacheVideo
Solution48.2%Medium
Design, Doubly-Linked List +2· 120 companies
147. Insertion Sort ListVideo
Solution60.5%Medium
Linked List, Sorting· 5 companies
148. Sort ListVideo
Solution65.2%Medium
Divide and Conquer, Linked List +3· 9 companies
150. Evaluate Reverse Polish NotationVideo
Solution58.5%Medium
Array, Math +1· 18 companies
151. Reverse Words in a StringVideo
Solution57.8%Medium
String, Two Pointers· 30 companies
152. Maximum Product SubarrayVideo
Solution36.7%Medium
Array, Dynamic Programming· 23 companies
153. Find Minimum in Rotated Sorted ArrayVideo
Solution55.3%Medium
Array, Binary Search· 18 companies
155. Min StackVideo
Solution58.5%Medium
Design, Stack· 37 companies
156. Binary Tree Upside DownVideoPremium
Solution65.4%Medium
Binary Tree, Depth-First Search +1· 2 companies
159. Longest Substring with At Most Two Distinct CharactersVideoPremium
Solution57.0%Medium
Hash Table, Sliding Window +1· 5 companies
161. One Edit DistanceVideoPremium
Solution34.4%Medium
String, Two Pointers· 8 companies
162. Find Peak ElementVideo
Solution46.8%Medium
Array, Binary Search· 30 companies
164. Maximum GapVideo
Solution53.4%Medium
Array, Bucket Sort +2· 7 companies
165. Compare Version NumbersVideo
Solution46.8%Medium
String, Two Pointers· 11 companies
166. Fraction to Recurring DecimalVideo
Solution31.3%Medium
Hash Table, Math +1· 10 companies
Showing 51–100 of 2,133