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Problems

975 problems

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

Easy · 975 results

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TitleSolutionAcceptDifficultyTopics
202. Happy NumberVideo
Solution60.0%Easy
Hash Table, Math +1· 27 companies
203. Remove Linked List ElementsVideo
Solution55.3%Easy
Linked List, Recursion· 9 companies
205. Isomorphic StringsVideo
Solution48.8%Easy
Hash Table, String· 15 companies
206. Reverse Linked ListVideo
Solution81.0%Easy
Linked List, Recursion· 34 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
225. Implement Stack using QueuesVideo
Solution70.1%Easy
Design, Queue +1· 9 companies
226. Invert Binary TreeVideo
Solution80.5%Easy
Binary Tree, Breadth-First Search +2· 9 companies
228. Summary RangesVideo
Solution54.6%Easy
Array· 9 companies
231. Power of TwoVideo
Solution50.5%Easy
Bit Manipulation, Math +1· 11 companies
232. Implement Queue using StacksVideo
Solution70.2%Easy
Design, Queue +1· 12 companies
234. Palindrome Linked ListVideo
Solution58.8%Easy
Linked List, Recursion +2· 17 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
252. Meeting RoomsVideoPremium
Solution59.4%Easy
Array, Sorting· 10 companies
257. Binary Tree PathsVideo
Solution69.5%Easy
Backtracking, Binary Tree +3· 8 companies
258. Add DigitsVideo
Solution69.3%Easy
Math, Number Theory +1· 10 companies
263. Ugly NumberVideo
Solution43.9%Easy
Math· 8 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
270. Closest Binary Search Tree ValueVideoPremium
Solution49.2%Easy
Binary Search, Binary Search Tree +3· 7 companies
278. First Bad VersionVideo
Solution47.5%Easy
Binary Search, Interactive· 7 companies
283. Move ZeroesVideo
Solution64.3%Easy
Array, Two Pointers· 46 companies
290. Word PatternVideo
Solution44.5%Easy
Hash Table, String· 9 companies
292. Nim GameVideo
Solution60.6%Easy
Brainteaser, Game Theory +1· 6 companies
293. Flip GameVideoPremium
Solution64.8%Easy
String· 1 company
303. Range Sum Query - ImmutableVideo
Solution73.5%Easy
Array, Design +1· 8 companies
326. Power of ThreeVideo
Solution51.4%Easy
Math, Recursion· 6 companies
338. Counting BitsVideo
Solution80.5%Easy
Bit Manipulation, Dynamic Programming· 9 companies
342. Power of FourVideo
Solution52.5%Easy
Bit Manipulation, Math +1· 8 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
346. Moving Average from Data StreamVideoPremium
Solution80.2%Easy
Array, Data Stream +2· 11 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
367. Valid Perfect SquareVideo
Solution44.8%Easy
Binary Search, Math· 8 companies
374. Guess Number Higher or LowerVideo
Solution58.5%Easy
Binary Search, Interactive· 6 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
401. Binary WatchVideo
Solution65.9%Easy
Backtracking, Bit Manipulation· 5 companies
404. Sum of Left LeavesVideo
Solution63.1%Easy
Binary Tree, Breadth-First Search +2· 6 companies
405. Convert a Number to HexadecimalVideo
Solution54.8%Easy
Bit Manipulation, Math· 6 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
414. Third Maximum NumberVideo
Solution40.3%Easy
Array, Sorting· 9 companies
Showing 51–100 of 975