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Problems

985 problems

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

Hard · 985 results

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TitleSolutionAcceptDifficultyTopics
972. Equal Rational NumbersVideo
Solution47.9%Hard
Math, String· 2 companies
975. Odd Even JumpVideo
Solution41.7%Hard
Array, Dynamic Programming +3· 3 companies
980. Unique Paths IIIVideo
Solution82.8%Hard
Array, Backtracking +2· 7 companies
982. Triples with Bitwise AND Equal To ZeroVideo
Solution60.7%Hard
Array, Bit Manipulation +1· 2 companies
987. Vertical Order Traversal of a Binary TreeVideo
Solution54.6%Hard
Binary Tree, Breadth-First Search +4· 15 companies
992. Subarrays with K Different IntegersVideo
Solution69.0%Hard
Array, Counting +2· 18 companies
995. Minimum Number of K Consecutive Bit FlipsVideo
Solution62.7%Hard
Array, Bit Manipulation +3· 2 companies
996. Number of Squareful ArraysVideo
Solution51.9%Hard
Array, Backtracking +5· 2 companies
1000. Minimum Cost to Merge StonesVideo
Solution47.0%Hard
Array, Dynamic Programming +1· 4 companies
1001. Grid IlluminationVideo
Solution39.7%Hard
Array, Hash Table· 1 company
1012. Numbers With Repeated DigitsVideo
Solution48.9%Hard
Dynamic Programming, Math· 2 companies
1028. Recover a Tree From Preorder TraversalVideo
Solution83.2%Hard
Binary Tree, Depth-First Search +2· 6 companies
1032. Stream of CharactersVideo
Solution52.8%Hard
Array, Data Stream +3· 4 companies
1036. Escape a Large MazeVideo
Solution37.0%Hard
Array, Breadth-First Search +2· 4 companies
1044. Longest Duplicate SubstringVideo
Solution31.1%Hard
Binary Search, Hash Function +4· 7 companies
1063. Number of Valid SubarraysVideoPremium
Solution79.9%Hard
Array, Monotonic Stack +1· 1 company
1067. Digit Count in RangeVideoPremium
Solution46.4%Hard
Dynamic Programming, Math· 1 company
1074. Number of Submatrices That Sum to TargetVideo
Solution74.4%Hard
Array, Hash Table +2· 4 companies
1088. Confusing Number IIVideoPremium
Solution47.1%Hard
Backtracking, Math· 1 company
1092. Shortest Common Supersequence Video
Solution62.4%Hard
Dynamic Programming, String· 5 companies
1095. Find in Mountain ArrayVideo
Solution41.9%Hard
Array, Binary Search +1· 6 companies
1096. Brace Expansion IIVideo
Solution79.2%Hard
Backtracking, Breadth-First Search +2· 1 company
1097. Game Play Analysis VVideoPremium
Solution50.8%Hard
Database· 1 company
1106. Parsing A Boolean ExpressionVideo
Solution69.8%Hard
Recursion, Stack +1· 8 companies
1121. Divide Array Into Increasing SequencesVideoPremium
Solution65.4%Hard
Array, Counting· 1 company
1125. Smallest Sufficient TeamVideo
Solution55.5%Hard
Array, Bit Manipulation +2· 1 company
1127. User Purchase PlatformVideoPremium
Solution46.2%Hard
Database· 1 company
1147. Longest Chunked Palindrome DecompositionVideo
Solution58.6%Hard
Dynamic Programming, Greedy +4· 1 company
1153. String Transforms Into Another StringVideoPremium
Solution34.9%Hard
Hash Table, String· 1 company
1157. Online Majority Element In SubarrayVideo
Solution40.9%Hard
Array, Binary Indexed Tree +3· 1 company
1159. Market Analysis IIVideoPremium
Solution57.4%Hard
Database· 1 company
1163. Last Substring in Lexicographical OrderVideo
Solution35.1%Hard
String, Two Pointers· 5 companies
1168. Optimize Water Distribution in a VillageVideoPremium
Solution65.5%Hard
Graph, Heap (Priority Queue) +2· 2 companies
1172. Dinner Plate StacksVideo
Solution34.2%Hard
Design, Hash Table +2· 2 companies
1178. Number of Valid Words for Each PuzzleVideo
Solution47.8%Hard
Array, Bit Manipulation +3· 1 company
1183. Maximum Number of OnesVideoPremium
Solution70.6%Hard
Greedy, Heap (Priority Queue)· 1 company
1187. Make Array Strictly IncreasingVideo
Solution58.0%Hard
Array, Binary Search +2
1192. Critical Connections in a NetworkVideo
Solution60.6%Hard
Biconnected Component, Depth-First Search +1· 8 companies
1194. Tournament WinnersVideoPremium
Solution50.2%Hard
Database· 1 company
1199. Minimum Time to Build BlocksVideoPremium
Solution49.2%Hard
Array, Greedy +2· 1 company
1203. Sort Items by Groups Respecting DependenciesVideo
Solution66.0%Hard
Breadth-First Search, Depth-First Search +2· 5 companies
1206. Design SkiplistVideo
Solution59.7%Hard
Design, Linked List· 8 companies
1210. Minimum Moves to Reach Target with RotationsVideo
Solution52.7%Hard
Array, Breadth-First Search +1· 1 company
1216. Valid Palindrome IIIVideoPremium
Solution49.2%Hard
Dynamic Programming, String· 3 companies
1220. Count Vowels PermutationVideo
Solution61.7%Hard
Dynamic Programming· 1 company
1223. Dice Roll SimulationVideo
Solution51.4%Hard
Array, Dynamic Programming· 2 companies
1224. Maximum Equal FrequencyVideo
Solution38.8%Hard
Array, Hash Table· 1 company
1225. Report Contiguous DatesVideoPremium
Solution56.9%Hard
Database· 2 companies
1231. Divide ChocolateVideoPremium
Solution60.5%Hard
Array, Binary Search· 1 company
1235. Maximum Profit in Job SchedulingVideo
Solution54.8%Hard
Array, Binary Search +2· 22 companies
Showing 201–250 of 985