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Problems

4,005 problems

Has videoPremium onlyReset
Array2,209String870Hash Table786Math682Dynamic Programming666Sorting504Greedy480Binary Search352Depth-First Search335Database303Bit Manipulation283Matrix278Tree261Breadth-First Search255Two Pointers249All topics

With video · 4,005 results

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TitleSolutionAcceptDifficultyTopics
201. Bitwise AND of Numbers RangeVideo
Solution49.4%Medium
Bit Manipulation· 5 companies
202. Happy NumberVideo
Solution60.0%Easy
Hash Table, Math +1· 27 companies
203. Remove Linked List ElementsVideo
Solution55.3%Easy
Linked List, Recursion· 9 companies
204. Count PrimesVideo
Solution35.8%Medium
Array, Enumeration +2· 17 companies
205. Isomorphic StringsVideo
Solution48.8%Easy
Hash Table, String· 15 companies
206. Reverse Linked ListVideo
Solution81.0%Easy
Linked List, Recursion· 34 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
212. Word Search IIVideo
Solution38.8%Hard
Array, Backtracking +3· 21 companies
213. House Robber IIVideo
Solution45.3%Medium
Array, Dynamic Programming· 19 companies
214. Shortest PalindromeVideo
Solution43.3%Hard
Hash Function, Rolling Hash +2· 8 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
217. Contains DuplicateVideo
Solution64.8%Easy
Array, Hash Table +1· 20 companies
218. The Skyline ProblemVideo
Solution45.7%Hard
Array, Binary Indexed Tree +5· 13 companies
219. Contains Duplicate IIVideo
Solution51.6%Easy
Array, Hash Table +1· 15 companies
220. Contains Duplicate IIIVideo
Solution25.2%Hard
Array, Bucket Sort +3· 8 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
224. Basic CalculatorVideo
Solution47.3%Hard
Math, Recursion +2· 25 companies
225. Implement Stack using QueuesVideo
Solution70.1%Easy
Design, Queue +1· 9 companies
226. Invert Binary TreeVideo
Solution80.5%Easy
Binary Tree, Breadth-First Search +2· 9 companies
227. Basic Calculator IIVideo
Solution47.3%Medium
Math, Stack +1· 32 companies
228. Summary RangesVideo
Solution54.6%Easy
Array· 9 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
231. Power of TwoVideo
Solution50.5%Easy
Bit Manipulation, Math +1· 11 companies
232. Implement Queue using StacksVideo
Solution70.2%Easy
Design, Queue +1· 12 companies
233. Number of Digit OneVideo
Solution39.9%Hard
Dynamic Programming, Math +1· 6 companies
234. Palindrome Linked ListVideo
Solution58.8%Easy
Linked List, Recursion +2· 17 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
239. Sliding Window MaximumVideo
Solution49.1%Hard
Array, Heap (Priority Queue) +3· 48 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
242. Valid AnagramVideo
Solution68.5%Easy
Hash Table, Sorting +1· 40 companies
243. Shortest Word DistanceVideoPremium
Solution66.3%Easy
Array, String· 8 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
246. Strobogrammatic NumberVideoPremium
Solution47.6%Easy
Hash Table, String +1· 2 companies
247. Strobogrammatic Number IIVideoPremium
Solution53.5%Medium
Array, Recursion +1· 2 companies
248. Strobogrammatic Number IIIVideoPremium
Solution42.3%Hard
Array, Recursion +1
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
Showing 201–250 of 4,005