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Problems

437 problems

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

Medium · 437 results

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TitleSolutionAcceptDifficultyTopics
3. Longest Substring Without Repeating CharactersVideo
Solution39.9%Medium
Hash Table, Sliding Window +1· 104 companies
5. Longest Palindromic SubstringVideo
Solution38.7%Medium
Dynamic Programming, String +1· 81 companies
6. Zigzag ConversionVideo
Solution54.9%Medium
String· 19 companies
8. String to Integer (atoi)Video
Solution21.4%Medium
String· 21 companies
12. Integer to RomanVideo
Solution71.8%Medium
Hash Table, Math +1· 31 companies
17. Letter Combinations of a Phone NumberVideo
Solution66.9%Medium
Backtracking, Hash Table +1· 34 companies
22. Generate ParenthesesVideo
Solution79.6%Medium
Backtracking, Dynamic Programming +1· 40 companies
38. Count and SayVideo
Solution63.7%Medium
String· 13 companies
43. Multiply StringsVideo
Solution44.4%Medium
Math, Simulation +1· 17 companies
49. Group AnagramsVideo
Solution73.0%Medium
Array, Hash Table +2· 87 companies
71. Simplify PathVideo
Solution51.4%Medium
Stack, String· 24 companies
72. Edit DistanceVideo
Solution61.5%Medium
Dynamic Programming, String· 24 companies
79. Word SearchVideo
Solution48.2%Medium
Array, Backtracking +2· 36 companies
91. Decode WaysVideo
Solution38.3%Medium
Dynamic Programming, String· 22 companies
93. Restore IP AddressesVideo
Solution57.3%Medium
Backtracking, String· 20 companies
97. Interleaving StringVideo
Solution45.0%Medium
Dynamic Programming, String· 10 companies
131. Palindrome PartitioningVideo
Solution74.4%Medium
Backtracking, Dynamic Programming +1· 10 companies
139. Word BreakVideo
Solution49.8%Medium
Array, Dynamic Programming +4· 32 companies
151. Reverse Words in a StringVideo
Solution57.8%Medium
String, Two Pointers· 30 companies
159. Longest Substring with At Most Two Distinct CharactersVideoPremium
Solution57.0%Medium
Hash Table, Sliding Window +1· 5 companies
161. One Edit DistanceVideoPremium
Solution34.4%Medium
String, Two Pointers· 8 companies
165. Compare Version NumbersVideo
Solution46.8%Medium
String, Two Pointers· 11 companies
166. Fraction to Recurring DecimalVideo
Solution31.3%Medium
Hash Table, Math +1· 10 companies
179. Largest NumberVideo
Solution43.9%Medium
Array, Greedy +2· 23 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
208. Implement Trie (Prefix Tree)Video
Solution69.9%Medium
Design, Hash Table +2· 21 companies
211. Design Add and Search Words Data StructureVideo
Solution48.9%Medium
Depth-First Search, Design +2· 13 companies
227. Basic Calculator IIVideo
Solution47.3%Medium
Math, Stack +1· 32 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
267. Palindrome Permutation IIVideoPremium
Solution41.9%Medium
Backtracking, Hash Table +1
271. Encode and Decode StringsVideoPremium
Solution51.9%Medium
Array, Design +1· 11 companies
288. Unique Word AbbreviationVideoPremium
Solution28.1%Medium
Array, Design +2· 1 company
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
306. Additive NumberVideo
Solution34.2%Medium
Backtracking, String· 3 companies
316. Remove Duplicate LettersVideo
Solution54.7%Medium
Greedy, Monotonic Stack +2· 13 companies
318. Maximum Product of Word LengthsVideo
Solution61.7%Medium
Array, Bit Manipulation +1· 2 companies
320. Generalized AbbreviationVideoPremium
Solution61.0%Medium
Backtracking, Bit Manipulation +1· 1 company
331. Verify Preorder Serialization of a Binary TreeVideo
Solution47.8%Medium
Binary Tree, Stack +2· 1 company
340. Longest Substring with At Most K Distinct CharactersVideoPremium
Solution49.9%Medium
Hash Table, Sliding Window +1· 12 companies
385. Mini ParserVideo
Solution44.0%Medium
Depth-First Search, Stack +1· 4 companies
388. Longest Absolute File PathVideo
Solution49.9%Medium
Depth-First Search, Stack +1· 4 companies
394. Decode StringVideo
Solution63.0%Medium
Recursion, Stack +1· 40 companies
395. Longest Substring with At Least K Repeating CharactersVideo
Solution46.8%Medium
Divide and Conquer, Hash Table +2· 10 companies
399. Evaluate DivisionVideo
Solution64.7%Medium
Array, Breadth-First Search +5· 23 companies
Showing 1–50 of 437