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Problems

2,133 problems

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

Medium · 2,133 results

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TitleSolutionAcceptDifficultyTopics
167. Two Sum II - Input Array Is SortedVideo
Solution65.5%Medium
Array, Binary Search +1· 16 companies
172. Factorial Trailing ZeroesVideo
Solution47.5%Medium
Math· 5 companies
173. Binary Search Tree IteratorVideo
Solution76.9%Medium
Binary Search Tree, Binary Tree +4· 8 companies
176. Second Highest SalaryVideo
Solution48.7%Medium
Database· 19 companies
177. Nth Highest SalaryVideo
Solution40.5%Medium
Database· 11 companies
178. Rank ScoresVideo
Solution69.1%Medium
Database· 6 companies
179. Largest NumberVideo
Solution43.9%Medium
Array, Greedy +2· 23 companies
180. Consecutive NumbersVideo
Solution49.7%Medium
Database· 9 companies
184. Department Highest SalaryVideo
Solution59.9%Medium
Database· 7 companies
186. Reverse Words in a String IIVideoPremium
Solution56.6%Medium
String, Two Pointers· 4 companies
187. Repeated DNA SequencesVideo
Solution53.7%Medium
Bit Manipulation, Hash Function +4· 7 companies
189. Rotate ArrayVideo
Solution45.3%Medium
Array, Math +1· 27 companies
192. Word FrequencyVideo
Solution26.3%Medium
Shell· 4 companies
194. Transpose FileVideo
Solution27.1%Medium
Shell· 3 companies
198. House RobberVideo
Solution53.6%Medium
Array, Dynamic Programming· 40 companies
199. Binary Tree Right Side ViewVideo
Solution71.5%Medium
Binary Tree, Breadth-First Search +2· 14 companies
200. Number of IslandsVideo
Solution65.2%Medium
Array, Breadth-First Search +3· 86 companies
201. Bitwise AND of Numbers RangeVideo
Solution49.4%Medium
Bit Manipulation· 5 companies
204. Count PrimesVideo
Solution35.8%Medium
Array, Enumeration +2· 17 companies
207. Course ScheduleVideo
Solution52.2%Medium
Breadth-First Search, Depth-First Search +2· 45 companies
208. Implement Trie (Prefix Tree)Video
Solution69.9%Medium
Design, Hash Table +2· 21 companies
209. Minimum Size Subarray SumVideo
Solution53.1%Medium
Array, Binary Search +2· 18 companies
210. Course Schedule IIVideo
Solution56.3%Medium
Breadth-First Search, Depth-First Search +2· 36 companies
211. Design Add and Search Words Data StructureVideo
Solution48.9%Medium
Depth-First Search, Design +2· 13 companies
213. House Robber IIVideo
Solution45.3%Medium
Array, Dynamic Programming· 19 companies
215. Kth Largest Element in an ArrayVideo
Solution69.4%Medium
Array, Divide and Conquer +3· 41 companies
216. Combination Sum IIIVideo
Solution73.6%Medium
Array, Backtracking· 4 companies
221. Maximal SquareVideo
Solution50.7%Medium
Array, Dynamic Programming +1· 28 companies
222. Count Complete Tree NodesVideo
Solution72.6%Medium
Binary Search, Binary Tree +2· 7 companies
223. Rectangle AreaVideo
Solution50.3%Medium
Geometry, Math· 7 companies
227. Basic Calculator IIVideo
Solution47.3%Medium
Math, Stack +1· 32 companies
229. Majority Element IIVideo
Solution56.5%Medium
Array, Counting +2· 9 companies
230. Kth Smallest Element in a BSTVideo
Solution77.2%Medium
Binary Search Tree, Binary Tree +2· 12 companies
235. Lowest Common Ancestor of a Binary Search TreeVideo
Solution71.4%Medium
Binary Search Tree, Binary Tree +2· 10 companies
236. Lowest Common Ancestor of a Binary TreeVideo
Solution70.1%Medium
Binary Tree, Depth-First Search +1· 22 companies
237. Delete Node in a Linked ListVideo
Solution84.3%Medium
Linked List· 10 companies
238. Product of Array Except SelfVideo
Solution69.3%Medium
Array, Prefix Sum· 40 companies
240. Search a 2D Matrix IIVideo
Solution58.2%Medium
Array, Binary Search +2· 16 companies
241. Different Ways to Add ParenthesesVideo
Solution73.7%Medium
Dynamic Programming, Math +3· 6 companies
244. Shortest Word Distance IIVideoPremium
Solution62.8%Medium
Array, Design +3· 4 companies
245. Shortest Word Distance IIIVideoPremium
Solution59.4%Medium
Array, String· 2 companies
247. Strobogrammatic Number IIVideoPremium
Solution53.5%Medium
Array, Recursion +1· 2 companies
249. Group Shifted StringsVideoPremium
Solution67.8%Medium
Array, Hash Table +1· 4 companies
250. Count Univalue SubtreesVideoPremium
Solution57.5%Medium
Binary Tree, Depth-First Search +1· 4 companies
251. Flatten 2D VectorVideoPremium
Solution50.5%Medium
Array, Design +2· 4 companies
253. Meeting Rooms IIVideoPremium
Solution52.6%Medium
Array, Greedy +4· 42 companies
254. Factor CombinationsVideoPremium
Solution50.5%Medium
Backtracking· 2 companies
255. Verify Preorder Sequence in Binary Search TreeVideoPremium
Solution51.7%Medium
Array, Binary Search Tree +5· 5 companies
256. Paint HouseVideoPremium
Solution64.3%Medium
Array, Dynamic Programming· 8 companies
259. 3Sum SmallerVideoPremium
Solution51.4%Medium
Array, Binary Search +2· 7 companies
Showing 101–150 of 2,133