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Problems

437 problems

Has videoPremium onlyReset
Array1,212Hash Table473String437Math331Greedy330Dynamic Programming327Sorting302Depth-First Search208Binary Search189Breadth-First Search166Matrix163Tree158Prefix Sum155Two Pointers150Database137All topics

Medium · 437 results

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TitleSolutionAcceptDifficultyTopics
1177. Can Make Palindrome from SubstringVideo
Solution42.0%Medium
Array, Bit Manipulation +3· 1 company
1181. Before and After PuzzleVideoPremium
Solution51.8%Medium
Array, Hash Table +2· 1 company
1190. Reverse Substrings Between Each Pair of ParenthesesVideo
Solution75.2%Medium
Stack, String· 7 companies
1202. Smallest String With SwapsVideo
Solution61.0%Medium
Array, Breadth-First Search +5· 8 companies
1208. Get Equal Substrings Within BudgetVideo
Solution60.2%Medium
Binary Search, Prefix Sum +2· 4 companies
1209. Remove All Adjacent Duplicates in String IIVideo
Solution61.7%Medium
Stack, String· 18 companies
1233. Remove Sub-Folders from the FilesystemVideo
Solution78.6%Medium
Array, Depth-First Search +2· 8 companies
1234. Replace the Substring for Balanced StringVideo
Solution41.3%Medium
Sliding Window, String· 1 company
1236. Web CrawlerVideoPremium
Solution68.8%Medium
Breadth-First Search, Depth-First Search +2· 7 companies
1239. Maximum Length of a Concatenated String with Unique CharactersVideo
Solution54.7%Medium
Array, Backtracking +2· 6 companies
1247. Minimum Swaps to Make Strings EqualVideo
Solution65.3%Medium
Greedy, Math +1· 4 companies
1249. Minimum Remove to Make Valid ParenthesesVideo
Solution71.3%Medium
Stack, String· 11 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
1268. Search Suggestions SystemVideo
Solution65.1%Medium
Array, Binary Search +4· 19 companies
1286. Iterator for CombinationVideo
Solution72.7%Medium
Backtracking, Design +2· 1 company
1297. Maximum Number of Occurrences of a SubstringVideo
Solution54.9%Medium
Hash Table, Sliding Window +1· 7 companies
1324. Print Words VerticallyVideo
Solution68.1%Medium
Array, Simulation +1· 2 companies
1328. Break a PalindromeVideo
Solution51.6%Medium
Greedy, String· 6 companies
1347. Minimum Number of Steps to Make Two Strings AnagramVideo
Solution82.6%Medium
Counting, Hash Table +1· 10 companies
1358. Number of Substrings Containing All Three CharactersVideo
Solution74.4%Medium
Hash Table, Sliding Window +1· 6 companies
1366. Rank Teams by VotesVideo
Solution60.1%Medium
Array, Counting +3· 7 companies
1371. Find the Longest Substring Containing Vowels in Even CountsVideo
Solution75.7%Medium
Bit Manipulation, Hash Table +2· 6 companies
1396. Design Underground SystemVideo
Solution74.8%Medium
Design, Hash Table +1· 7 companies
1400. Construct K Palindrome StringsVideo
Solution68.6%Medium
Counting, Greedy +2· 6 companies
1404. Number of Steps to Reduce a Number in Binary Representation to OneVideo
Solution63.8%Medium
Bit Manipulation, String· 7 companies
1405. Longest Happy StringVideo
Solution65.5%Medium
Greedy, Heap (Priority Queue) +1· 8 companies
1410. HTML Entity ParserVideo
Solution50.0%Medium
Hash Table, String· 3 companies
1415. The k-th Lexicographical String of All Happy Strings of Length nVideo
Solution87.1%Medium
Backtracking, String· 5 companies
1418. Display Table of Food Orders in a RestaurantVideo
Solution76.5%Medium
Array, Hash Table +3· 2 companies
1419. Minimum Number of Frogs CroakingVideo
Solution51.2%Medium
Counting, String· 2 companies
1433. Check If a String Can Break Another StringVideo
Solution70.9%Medium
Greedy, Sorting +1
1447. Simplified FractionsVideo
Solution70.3%Medium
Math, Number Theory +1· 1 company
1451. Rearrange Words in a SentenceVideo
Solution67.5%Medium
Sorting, String· 2 companies
1452. People Whose List of Favorite Companies Is Not a Subset of Another ListVideo
Solution60.6%Medium
Array, Hash Table +1· 2 companies
1456. Maximum Number of Vowels in a Substring of Given LengthVideo
Solution63.0%Medium
Sliding Window, String· 6 companies
1461. Check If a String Contains All Binary Codes of Size KVideo
Solution61.5%Medium
Bit Manipulation, Hash Function +3· 5 companies
1487. Making File Names UniqueVideo
Solution38.5%Medium
Array, Hash Table +1· 1 company
1513. Number of Substrings With Only 1sVideo
Solution57.4%Medium
Math, String· 3 companies
1525. Number of Good Ways to Split a StringVideo
Solution68.2%Medium
Bit Manipulation, Dynamic Programming +2· 2 companies
1529. Minimum Suffix FlipsVideo
Solution73.9%Medium
Greedy, String· 5 companies
1540. Can Convert String in K MovesVideo
Solution37.6%Medium
Hash Table, String· 1 company
1541. Minimum Insertions to Balance a Parentheses StringVideo
Solution61.8%Medium
Greedy, Stack +1· 3 companies
1545. Find Kth Bit in Nth Binary StringVideo
Solution73.7%Medium
Recursion, Simulation +1· 5 companies
1554. Strings Differ by One CharacterVideoPremium
Solution39.4%Medium
Hash Function, Hash Table +2· 1 company
1573. Number of Ways to Split a StringVideo
Solution34.6%Medium
Math, String· 1 company
1578. Minimum Time to Make Rope ColorfulVideo
Solution65.2%Medium
Array, Dynamic Programming +2· 3 companies
1593. Split a String Into the Max Number of Unique SubstringsVideo
Solution68.8%Medium
Backtracking, Hash Table +1· 5 companies
1604. Alert Using Same Key-Card Three or More Times in a One Hour PeriodVideo
Solution46.0%Medium
Array, Hash Table +2· 5 companies
Showing 151–200 of 437