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Problems

190 problems

Has videoPremium onlyReset
Array447String249Hash Table190Math173Database113Sorting100Simulation93Counting70Two Pointers70Bit Manipulation54Greedy51Matrix41Tree40Depth-First Search39Binary Tree37All topics

Easy · 190 results

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TitleSolutionAcceptDifficultyTopics
1. Two SumVideo
Solution57.8%Easy
Array, Hash Table· 127 companies
13. Roman to IntegerVideo
Solution67.0%Easy
Hash Table, Math +1· 36 companies
141. Linked List CycleVideo
Solution55.2%Easy
Hash Table, Linked List +1· 24 companies
160. Intersection of Two Linked ListsVideo
Solution64.6%Easy
Hash Table, Linked List +1· 13 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
202. Happy NumberVideo
Solution60.0%Easy
Hash Table, Math +1· 27 companies
205. Isomorphic StringsVideo
Solution48.8%Easy
Hash Table, String· 15 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
242. Valid AnagramVideo
Solution68.5%Easy
Hash Table, Sorting +1· 40 companies
246. Strobogrammatic NumberVideoPremium
Solution47.6%Easy
Hash Table, String +1· 2 companies
266. Palindrome PermutationVideoPremium
Solution68.6%Easy
Bit Manipulation, Hash Table +1· 5 companies
268. Missing NumberVideo
Solution72.4%Easy
Array, Binary Search +4· 19 companies
290. Word PatternVideo
Solution44.5%Easy
Hash Table, String· 9 companies
349. Intersection of Two ArraysVideo
Solution78.2%Easy
Array, Binary Search +3· 16 companies
350. Intersection of Two Arrays IIVideo
Solution60.4%Easy
Array, Binary Search +3· 9 companies
359. Logger Rate LimiterVideoPremium
Solution76.8%Easy
Data Stream, Design +1· 21 companies
383. Ransom NoteVideo
Solution66.3%Easy
Counting, Hash Table +1· 14 companies
387. First Unique Character in a StringVideo
Solution66.4%Easy
Counting, Hash Table +2· 25 companies
389. Find the DifferenceVideo
Solution60.8%Easy
Bit Manipulation, Hash Table +2· 6 companies
409. Longest PalindromeVideo
Solution55.9%Easy
Greedy, Hash Table +1· 8 companies
448. Find All Numbers Disappeared in an ArrayVideo
Solution64.4%Easy
Array, Hash Table· 7 companies
496. Next Greater Element IVideo
Solution76.5%Easy
Array, Hash Table +2· 17 companies
500. Keyboard RowVideo
Solution74.3%Easy
Array, Hash Table +1· 4 companies
575. Distribute CandiesVideo
Solution71.5%Easy
Array, Hash Table· 3 companies
594. Longest Harmonious SubsequenceVideo
Solution65.1%Easy
Array, Counting +3· 7 companies
599. Minimum Index Sum of Two ListsVideo
Solution60.8%Easy
Array, Hash Table +1· 4 companies
645. Set MismatchVideo
Solution43.4%Easy
Array, Bit Manipulation +2· 7 companies
653. Two Sum IV - Input is a BSTVideo
Solution63.7%Easy
Binary Search Tree, Binary Tree +5· 8 companies
697. Degree of an ArrayVideo
Solution58.8%Easy
Array, Hash Table· 12 companies
705. Design HashSetVideo
Solution67.9%Easy
Array, Design +3· 6 companies
706. Design HashMapVideo
Solution66.5%Easy
Array, Design +3· 13 companies
734. Sentence SimilarityVideoPremium
Solution44.5%Easy
Array, Hash Table +1· 1 company
748. Shortest Completing WordVideo
Solution63.5%Easy
Array, Hash Table +1· 1 company
760. Find Anagram MappingsVideoPremium
Solution83.8%Easy
Array, Hash Table· 1 company
771. Jewels and StonesVideo
Solution89.5%Easy
Hash Table, String· 6 companies
804. Unique Morse Code WordsVideo
Solution83.6%Easy
Array, Hash Table +1· 3 companies
819. Most Common WordVideo
Solution45.0%Easy
Array, Counting +2· 5 companies
859. Buddy StringsVideo
Solution34.0%Easy
Hash Table, String· 5 companies
884. Uncommon Words from Two SentencesVideo
Solution75.8%Easy
Counting, Hash Table +1· 2 companies
888. Fair Candy SwapVideo
Solution65.9%Easy
Array, Binary Search +2· 6 companies
914. X of a Kind in a Deck of CardsVideo
Solution30.4%Easy
Array, Counting +3· 2 companies
929. Unique Email AddressesVideo
Solution67.9%Easy
Array, Hash Table +1· 5 companies
953. Verifying an Alien DictionaryVideo
Solution55.9%Easy
Array, Hash Table +1· 8 companies
961. N-Repeated Element in Size 2N ArrayVideo
Solution79.9%Easy
Array, Hash Table· 6 companies
997. Find the Town JudgeVideo
Solution51.2%Easy
Array, Graph +1· 7 companies
1002. Find Common CharactersVideo
Solution74.6%Easy
Array, Hash Table +1· 6 companies
1086. High FiveVideoPremium
Solution74.5%Easy
Array, Hash Table +2· 2 companies
1122. Relative Sort ArrayVideo
Solution75.4%Easy
Array, Counting Sort +2· 6 companies
Showing 1–50 of 190