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Problems

877 problems

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

877 results

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TitleSolutionAcceptDifficultyTopics
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
214. Shortest PalindromeVideo
Solution43.3%Hard
Hash Function, Rolling Hash +2· 8 companies
224. Basic CalculatorVideo
Solution47.3%Hard
Math, Recursion +2· 25 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
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
257. Binary Tree PathsVideo
Solution69.5%Easy
Backtracking, Binary Tree +3· 8 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
269. Alien DictionaryVideoPremium
Solution37.1%Hard
Array, Breadth-First Search +4· 18 companies
271. Encode and Decode StringsVideoPremium
Solution51.9%Medium
Array, Design +1· 11 companies
273. Integer to English WordsVideo
Solution34.9%Hard
Math, Recursion +1· 24 companies
282. Expression Add OperatorsVideo
Solution43.5%Hard
Backtracking, Math +1· 7 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
293. Flip GameVideoPremium
Solution64.8%Easy
String· 1 company
297. Serialize and Deserialize Binary TreeVideo
Solution61.1%Hard
Binary Tree, Breadth-First Search +4· 23 companies
299. Bulls and CowsVideo
Solution52.9%Medium
Counting, Hash Table +1· 7 companies
301. Remove Invalid ParenthesesVideo
Solution52.4%Hard
Backtracking, Breadth-First Search +1· 10 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
336. Palindrome PairsVideo
Solution37.7%Hard
Array, Hash Table +2· 8 companies
340. Longest Substring with At Most K Distinct CharactersVideoPremium
Solution49.9%Medium
Hash Table, Sliding Window +1· 12 companies
344. Reverse StringVideo
Solution81.2%Easy
String, Two Pointers· 16 companies
345. Reverse Vowels of a StringVideo
Solution62.1%Easy
String, Two Pointers· 13 companies
358. Rearrange String k Distance ApartVideoPremium
Solution39.9%Hard
Counting, Greedy +4· 4 companies
383. Ransom NoteVideo
Solution66.3%Easy
Counting, Hash Table +1· 14 companies
385. Mini ParserVideo
Solution44.0%Medium
Depth-First Search, Stack +1· 4 companies
387. First Unique Character in a StringVideo
Solution66.4%Easy
Counting, Hash Table +2· 25 companies
388. Longest Absolute File PathVideo
Solution49.9%Medium
Depth-First Search, Stack +1· 4 companies
389. Find the DifferenceVideo
Solution60.8%Easy
Bit Manipulation, Hash Table +2· 6 companies
392. Is SubsequenceVideo
Solution49.5%Easy
Dynamic Programming, String +1· 16 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
402. Remove K DigitsVideo
Solution37.7%Medium
Greedy, Monotonic Stack +2· 21 companies
408. Valid Word AbbreviationVideoPremium
Solution37.0%Easy
String, Two Pointers· 7 companies
409. Longest PalindromeVideo
Solution55.9%Easy
Greedy, Hash Table +1· 8 companies
Showing 51–100 of 877