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Problems

248 problems

Has videoPremium onlyReset
Array447String248Hash Table189Math173Database113Sorting100Simulation93Two Pointers70Counting69Bit Manipulation54Greedy51Matrix41Tree40Depth-First Search39Binary Tree37All topics

Easy · With video · 248 results

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TitleSolutionAcceptDifficultyTopics
13. Roman to IntegerVideo
Solution67.0%Easy
Hash Table, Math +1· 36 companies
14. Longest Common PrefixVideo
Solution48.6%Easy
String, Trie· 60 companies
20. Valid ParenthesesVideo
Solution45.2%Easy
Stack, String· 113 companies
28. Find the Index of the First Occurrence in a StringVideo
Solution47.0%Easy
String, String Matching +1· 16 companies
58. Length of Last WordVideo
Solution59.7%Easy
String· 7 companies
67. Add BinaryVideo
Solution58.4%Easy
Bit Manipulation, Math +2· 17 companies
125. Valid PalindromeVideo
Solution54.2%Easy
String, Two Pointers· 39 companies
168. Excel Sheet Column TitleVideo
Solution47.9%Easy
Math, String· 10 companies
171. Excel Sheet Column NumberVideo
Solution68.6%Easy
Math, String· 9 companies
205. Isomorphic StringsVideo
Solution48.8%Easy
Hash Table, String· 15 companies
242. Valid AnagramVideo
Solution68.5%Easy
Hash Table, Sorting +1· 40 companies
243. Shortest Word DistanceVideoPremium
Solution66.3%Easy
Array, String· 8 companies
246. Strobogrammatic NumberVideoPremium
Solution47.6%Easy
Hash Table, String +1· 2 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
290. Word PatternVideo
Solution44.5%Easy
Hash Table, String· 9 companies
293. Flip GameVideoPremium
Solution64.8%Easy
String· 1 company
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
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
392. Is SubsequenceVideo
Solution49.5%Easy
Dynamic Programming, String +1· 16 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
412. Fizz BuzzVideo
Solution75.9%Easy
Math, Simulation +1· 18 companies
415. Add StringsVideo
Solution52.1%Easy
Math, Simulation +1· 14 companies
434. Number of Segments in a StringVideo
Solution37.6%Easy
String· 3 companies
459. Repeated Substring PatternVideo
Solution48.6%Easy
String, String Matching· 9 companies
482. License Key FormattingVideo
Solution46.4%Easy
String· 1 company
500. Keyboard RowVideo
Solution74.3%Easy
Array, Hash Table +1· 4 companies
520. Detect CapitalVideo
Solution56.8%Easy
String· 4 companies
521. Longest Uncommon Subsequence IVideo
Solution62.7%Easy
String· 2 companies
541. Reverse String IIVideo
Solution54.7%Easy
String, Two Pointers· 7 companies
551. Student Attendance Record IVideo
Solution50.1%Easy
String· 3 companies
557. Reverse Words in a String IIIVideo
Solution84.0%Easy
String, Two Pointers· 7 companies
599. Minimum Index Sum of Two ListsVideo
Solution60.8%Easy
Array, Hash Table +1· 4 companies
604. Design Compressed String IteratorVideoPremium
Solution40.5%Easy
Array, Design +2· 1 company
657. Robot Return to OriginVideo
Solution78.0%Easy
Simulation, String· 5 companies
680. Valid Palindrome IIVideo
Solution44.7%Easy
Greedy, String +1· 16 companies
696. Count Binary SubstringsVideo
Solution70.3%Easy
String, Two Pointers· 18 companies
709. To Lower CaseVideo
Solution84.8%Easy
String· 3 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
771. Jewels and StonesVideo
Solution89.5%Easy
Hash Table, String· 6 companies
796. Rotate StringVideo
Solution66.6%Easy
String, String Matching· 12 companies
800. Similar RGB ColorVideoPremium
Solution68.6%Easy
Enumeration, Math +1· 1 company
804. Unique Morse Code WordsVideo
Solution83.6%Easy
Array, Hash Table +1· 3 companies
806. Number of Lines To Write StringVideo
Solution72.9%Easy
Array, String· 2 companies
819. Most Common WordVideo
Solution45.0%Easy
Array, Counting +2· 5 companies
Showing 1–50 of 248