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

Problems

985 problems

Has videoPremium onlyReset
Array578Dynamic Programming332String191Math187Binary Search136Hash Table134Sorting106Greedy104Bit Manipulation103Graph96Depth-First Search91Heap (Priority Queue)78Prefix Sum77Matrix75Breadth-First Search71All topics

Hard · 985 results

Sign in to see which of these you have solved.Sign in
TitleSolutionAcceptDifficultyTopics
4. Median of Two Sorted ArraysVideo
Solution47.9%Hard
Array, Binary Search +1· 45 companies
10. Regular Expression MatchingVideo
Solution31.8%Hard
Dynamic Programming, Recursion +1· 25 companies
23. Merge k Sorted ListsVideo
Solution60.3%Hard
Divide and Conquer, Heap (Priority Queue) +2· 50 companies
25. Reverse Nodes in k-GroupVideo
Solution67.4%Hard
Linked List, Recursion· 27 companies
30. Substring with Concatenation of All WordsVideo
Solution35.4%Hard
Hash Table, Sliding Window +1· 10 companies
32. Longest Valid ParenthesesVideo
Solution41.2%Hard
Dynamic Programming, Stack +1· 25 companies
37. Sudoku SolverVideo
Solution65.4%Hard
Array, Backtracking +2· 17 companies
41. First Missing PositiveVideo
Solution43.8%Hard
Array, Hash Table· 33 companies
42. Trapping Rain WaterVideo
Solution68.2%Hard
Array, Dynamic Programming +3· 73 companies
44. Wildcard MatchingVideo
Solution32.8%Hard
Dynamic Programming, Greedy +2· 17 companies
51. N-QueensVideo
Solution76.3%Hard
Array, Backtracking· 16 companies
52. N-Queens IIVideo
Solution79.5%Hard
Backtracking· 10 companies
60. Permutation SequenceVideo
Solution54.3%Hard
Math, Recursion· 7 companies
65. Valid NumberVideo
Solution23.3%Hard
String· 7 companies
68. Text JustificationVideo
Solution52.4%Hard
Array, Simulation +1· 44 companies
76. Minimum Window SubstringVideo
Solution48.3%Hard
Hash Table, Sliding Window +1· 35 companies
84. Largest Rectangle in HistogramVideo
Solution50.7%Hard
Array, Monotonic Stack +1· 30 companies
85. Maximal RectangleVideo
Solution60.1%Hard
Array, Dynamic Programming +3· 15 companies
87. Scramble StringVideo
Solution45.9%Hard
Dynamic Programming, String· 6 companies
115. Distinct SubsequencesVideo
Solution54.1%Hard
Dynamic Programming, String· 13 companies
123. Best Time to Buy and Sell Stock IIIVideo
Solution54.5%Hard
Array, Dynamic Programming· 13 companies
124. Binary Tree Maximum Path SumVideo
Solution42.7%Hard
Binary Tree, Depth-First Search +2· 25 companies
126. Word Ladder IIVideo
Solution27.7%Hard
Backtracking, Breadth-First Search +2· 15 companies
127. Word LadderVideo
Solution46.3%Hard
Breadth-First Search, Hash Table +1· 41 companies
132. Palindrome Partitioning IIVideo
Solution37.9%Hard
Dynamic Programming, String· 9 companies
135. CandyVideo
Solution49.3%Hard
Array, Greedy· 24 companies
140. Word Break IIVideo
Solution56.4%Hard
Array, Backtracking +5· 16 companies
149. Max Points on a LineVideo
Solution31.6%Hard
Array, Geometry +2· 16 companies
154. Find Minimum in Rotated Sorted Array IIVideo
Solution47.2%Hard
Array, Binary Search· 5 companies
158. Read N Characters Given read4 II - Call Multiple TimesVideoPremium
Solution43.2%Hard
Array, Interactive +1· 5 companies
174. Dungeon GameVideo
Solution42.2%Hard
Array, Dynamic Programming +1· 8 companies
185. Department Top Three SalariesVideo
Solution62.1%Hard
Database· 11 companies
188. Best Time to Buy and Sell Stock IVVideo
Solution51.5%Hard
Array, Dynamic Programming· 11 companies
212. Word Search IIVideo
Solution38.8%Hard
Array, Backtracking +3· 21 companies
214. Shortest PalindromeVideo
Solution43.3%Hard
Hash Function, Rolling Hash +2· 8 companies
218. The Skyline ProblemVideo
Solution45.7%Hard
Array, Binary Indexed Tree +5· 13 companies
220. Contains Duplicate IIIVideo
Solution25.2%Hard
Array, Bucket Sort +3· 8 companies
224. Basic CalculatorVideo
Solution47.3%Hard
Math, Recursion +2· 25 companies
233. Number of Digit OneVideo
Solution39.9%Hard
Dynamic Programming, Math +1· 6 companies
239. Sliding Window MaximumVideo
Solution49.1%Hard
Array, Heap (Priority Queue) +3· 48 companies
248. Strobogrammatic Number IIIVideoPremium
Solution42.3%Hard
Array, Recursion +1
262. Trips and UsersVideo
Solution39.4%Hard
Database· 5 companies
265. Paint House IIVideoPremium
Solution57.0%Hard
Array, Dynamic Programming· 2 companies
269. Alien DictionaryVideoPremium
Solution37.1%Hard
Array, Breadth-First Search +4· 18 companies
272. Closest Binary Search Tree Value IIVideoPremium
Solution61.1%Hard
Binary Search Tree, Binary Tree +5· 3 companies
273. Integer to English WordsVideo
Solution34.9%Hard
Math, Recursion +1· 24 companies
282. Expression Add OperatorsVideo
Solution43.5%Hard
Backtracking, Math +1· 7 companies
295. Find Median from Data StreamVideo
Solution54.9%Hard
Data Stream, Design +3· 40 companies
296. Best Meeting PointVideoPremium
Solution61.1%Hard
Array, Math +2· 9 companies
297. Serialize and Deserialize Binary TreeVideo
Solution61.1%Hard
Binary Tree, Breadth-First Search +4· 23 companies
Showing 1–50 of 985