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Problems

797 problems

Has videoPremium onlyReset
Array2,237String877Hash Table797Math691Dynamic Programming673Sorting508Greedy485Binary Search357Depth-First Search338Database308Bit Manipulation286Matrix279Tree264Breadth-First Search257Prefix Sum252All topics

797 results

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TitleSolutionAcceptDifficultyTopics
1. Two SumVideo
Solution57.8%Easy
Array, Hash Table· 127 companies
3. Longest Substring Without Repeating CharactersVideo
Solution39.9%Medium
Hash Table, Sliding Window +1· 104 companies
12. Integer to RomanVideo
Solution71.8%Medium
Hash Table, Math +1· 31 companies
13. Roman to IntegerVideo
Solution67.0%Easy
Hash Table, Math +1· 36 companies
17. Letter Combinations of a Phone NumberVideo
Solution66.9%Medium
Backtracking, Hash Table +1· 34 companies
30. Substring with Concatenation of All WordsVideo
Solution35.4%Hard
Hash Table, Sliding Window +1· 10 companies
36. Valid SudokuVideo
Solution64.9%Medium
Array, Hash Table +1· 26 companies
37. Sudoku SolverVideo
Solution65.4%Hard
Array, Backtracking +2· 17 companies
41. First Missing PositiveVideo
Solution43.8%Hard
Array, Hash Table· 33 companies
49. Group AnagramsVideo
Solution73.0%Medium
Array, Hash Table +2· 87 companies
73. Set Matrix ZeroesVideo
Solution63.8%Medium
Array, Hash Table +1· 22 companies
76. Minimum Window SubstringVideo
Solution48.3%Hard
Hash Table, Sliding Window +1· 35 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
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
128. Longest Consecutive SequenceVideo
Solution47.0%Medium
Array, Hash Table +1· 40 companies
133. Clone GraphVideo
Solution66.1%Medium
Breadth-First Search, Depth-First Search +2· 18 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
140. Word Break IIVideo
Solution56.4%Hard
Array, Backtracking +5· 16 companies
141. Linked List CycleVideo
Solution55.2%Easy
Hash Table, Linked List +1· 24 companies
142. Linked List Cycle IIVideo
Solution59.3%Medium
Hash Table, Linked List +1· 13 companies
146. LRU CacheVideo
Solution48.2%Medium
Design, Doubly-Linked List +2· 120 companies
149. Max Points on a LineVideo
Solution31.6%Hard
Array, Geometry +2· 16 companies
159. Longest Substring with At Most Two Distinct CharactersVideoPremium
Solution57.0%Medium
Hash Table, Sliding Window +1· 5 companies
160. Intersection of Two Linked ListsVideo
Solution64.6%Easy
Hash Table, Linked List +1· 13 companies
166. Fraction to Recurring DecimalVideo
Solution31.3%Medium
Hash Table, Math +1· 10 companies
169. Majority ElementVideo
Solution66.2%Easy
Array, Counting +3· 22 companies
170. Two Sum III - Data structure designVideoPremium
Solution39.1%Easy
Array, Data Stream +3· 2 companies
187. Repeated DNA SequencesVideo
Solution53.7%Medium
Bit Manipulation, Hash Function +4· 7 companies
202. Happy NumberVideo
Solution60.0%Easy
Hash Table, Math +1· 27 companies
205. Isomorphic StringsVideo
Solution48.8%Easy
Hash Table, String· 15 companies
208. Implement Trie (Prefix Tree)Video
Solution69.9%Medium
Design, Hash Table +2· 21 companies
217. Contains DuplicateVideo
Solution64.8%Easy
Array, Hash Table +1· 20 companies
219. Contains Duplicate IIVideo
Solution51.6%Easy
Array, Hash Table +1· 15 companies
229. Majority Element IIVideo
Solution56.5%Medium
Array, Counting +2· 9 companies
242. Valid AnagramVideo
Solution68.5%Easy
Hash Table, Sorting +1· 40 companies
244. Shortest Word Distance IIVideoPremium
Solution62.8%Medium
Array, Design +3· 4 companies
246. Strobogrammatic NumberVideoPremium
Solution47.6%Easy
Hash Table, String +1· 2 companies
249. Group Shifted StringsVideoPremium
Solution67.8%Medium
Array, Hash Table +1· 4 companies
264. Ugly Number IIVideo
Solution49.7%Medium
Dynamic Programming, Hash Table +2· 9 companies
266. Palindrome PermutationVideoPremium
Solution68.6%Easy
Bit Manipulation, Hash Table +1· 5 companies
267. Palindrome Permutation IIVideoPremium
Solution41.9%Medium
Backtracking, Hash Table +1
268. Missing NumberVideo
Solution72.4%Easy
Array, Binary Search +4· 19 companies
288. Unique Word AbbreviationVideoPremium
Solution28.1%Medium
Array, Design +2· 1 company
290. Word PatternVideo
Solution44.5%Easy
Hash Table, String· 9 companies
291. Word Pattern IIVideoPremium
Solution49.1%Medium
Backtracking, Hash Table +1· 6 companies
299. Bulls and CowsVideo
Solution52.9%Medium
Counting, Hash Table +1· 7 companies
305. Number of Islands IIVideoPremium
Solution40.5%Hard
Array, Hash Table +1· 10 companies
Showing 1–50 of 797