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Problems

71 problems

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Array194Database104Hash Table83String71Depth-First Search57Dynamic Programming49Tree48Math45Sorting43Breadth-First Search40Greedy40Binary Tree38Binary Search31Two Pointers29Matrix28All topics

Medium · Premium · 71 results

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TitleSolutionAcceptDifficultyTopics
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
186. Reverse Words in a String IIVideoPremium
Solution56.6%Medium
String, Two Pointers· 4 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
320. Generalized AbbreviationVideoPremium
Solution61.0%Medium
Backtracking, Bit Manipulation +1· 1 company
340. Longest Substring with At Most K Distinct CharactersVideoPremium
Solution49.9%Medium
Hash Table, Sliding Window +1· 12 companies
418. Sentence Screen FittingVideoPremium
Solution36.3%Medium
Array, Dynamic Programming +1· 1 company
439. Ternary Expression ParserVideoPremium
Solution62.6%Medium
Recursion, Stack +1· 1 company
484. Find PermutationVideoPremium
Solution67.0%Medium
Array, Greedy +2· 1 company
536. Construct Binary Tree from StringVideoPremium
Solution58.7%Medium
Binary Tree, Depth-First Search +3· 3 companies
544. Output Contest MatchesVideoPremium
Solution77.3%Medium
Recursion, Simulation +1· 1 company
555. Split Concatenated StringsVideoPremium
Solution43.4%Medium
Array, Greedy +1· 1 company
616. Add Bold Tag in StringVideoPremium
Solution51.4%Medium
Array, Hash Table +3· 4 companies
635. Design Log Storage SystemVideoPremium
Solution59.8%Medium
Design, Hash Table +2· 4 companies
681. Next Closest TimeVideoPremium
Solution46.8%Medium
Backtracking, Enumeration +2· 1 company
737. Sentence Similarity IIVideoPremium
Solution51.2%Medium
Array, Breadth-First Search +4· 4 companies
751. IP to CIDRVideoPremium
–53.7%Medium
Bit Manipulation, String· 4 companies
758. Bold Words in StringVideoPremium
Solution53.2%Medium
Array, Hash Table +3· 1 company
1055. Shortest Way to Form StringVideoPremium
Solution61.6%Medium
Binary Search, Greedy +2· 3 companies
1058. Minimize Rounding Error to Meet TargetVideoPremium
Solution45.9%Medium
Array, Greedy +3· 1 company
1062. Longest Repeating SubstringVideoPremium
Solution63.4%Medium
Binary Search, Dynamic Programming +4· 4 companies
1087. Brace ExpansionVideoPremium
Solution66.5%Medium
Backtracking, Breadth-First Search +1· 6 companies
1100. Find K-Length Substrings With No Repeated CharactersVideoPremium
Solution76.5%Medium
Hash Table, Sliding Window +1· 1 company
1166. Design File SystemVideoPremium
Solution65.1%Medium
Design, Hash Table +2· 12 companies
1181. Before and After PuzzleVideoPremium
Solution51.8%Medium
Array, Hash Table +2· 1 company
1236. Web CrawlerVideoPremium
Solution68.8%Medium
Breadth-First Search, Depth-First Search +2· 7 companies
1256. Encode NumberVideoPremium
Solution70.0%Medium
Bit Manipulation, Math +1· 1 company
1257. Smallest Common RegionVideoPremium
Solution68.6%Medium
Array, Breadth-First Search +4· 1 company
1258. Synonymous SentencesVideoPremium
Solution57.2%Medium
Array, Backtracking +3· 3 companies
1554. Strings Differ by One CharacterVideoPremium
Solution39.4%Medium
Hash Function, Hash Table +2· 1 company
1618. Maximum Font to Fit a Sentence in a ScreenVideoPremium
Solution62.0%Medium
Array, Binary Search +2· 1 company
1682. Longest Palindromic Subsequence IIVideoPremium
Solution50.1%Medium
Dynamic Programming, String
1698. Number of Distinct Substrings in a StringVideoPremium
Solution64.4%Medium
Hash Function, Rolling Hash +3· 4 companies
1772. Sort Features by PopularityVideoPremium
Solution66.4%Medium
Array, Hash Table +2· 1 company
1794. Count Pairs of Equal Substrings With Minimum DifferenceVideoPremium
Solution62.7%Medium
Greedy, Hash Table +1· 1 company
1804. Implement Trie II (Prefix Tree)VideoPremium
Solution63.6%Medium
Design, Hash Table +2· 2 companies
2067. Number of Equal Count SubstringsVideoPremium
Solution45.1%Medium
Counting, Prefix Sum +1· 1 company
2083. Substrings That Begin and End With the Same LetterVideoPremium
Solution74.1%Medium
Counting, Hash Table +3
2168. Unique Substrings With Equal Digit FrequencyVideoPremium
Solution64.6%Medium
Counting, Hash Function +3· 1 company
2268. Minimum Number of KeypressesVideoPremium
Solution71.2%Medium
Counting, Greedy +3· 1 company
2330. Valid Palindrome IVVideoPremium
Solution75.8%Medium
String, Two Pointers· 2 companies
2408. Design SQLVideoPremium
Solution63.9%Medium
Array, Design +2· 2 companies
2450. Number of Distinct Binary Strings After Applying OperationsVideoPremium
Solution63.0%Medium
Math, String· 1 company
Showing 1–50 of 71