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Problems

191 problems

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Array578Dynamic Programming332String191Math187Binary Search136Hash Table134Sorting106Greedy104Bit Manipulation103Graph96Depth-First Search91Heap (Priority Queue)78Prefix Sum77Matrix75Breadth-First Search71All topics

Hard · 191 results

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TitleSolutionAcceptDifficultyTopics
828. Count Unique Characters of All Substrings of a Given StringVideo
Solution54.1%Hard
Dynamic Programming, Hash Table +1· 3 companies
839. Similar String GroupsVideo
Solution56.7%Hard
Array, Breadth-First Search +4· 5 companies
843. Guess the WordVideo
Solution36.9%Hard
Array, Game Theory +3· 10 companies
854. K-Similar StringsVideo
Solution41.3%Hard
Breadth-First Search, String· 2 companies
899. Orderly QueueVideo
Solution67.4%Hard
Math, Sorting +1· 2 companies
902. Numbers At Most N Given Digit SetVideo
Solution45.9%Hard
Array, Binary Search +3· 4 companies
903. Valid Permutations for DI SequenceVideo
Solution56.9%Hard
Dynamic Programming, Prefix Sum +1
936. Stamping The SequenceVideo
Solution62.2%Hard
Greedy, Queue +2· 1 company
940. Distinct Subsequences IIVideo
Solution56.7%Hard
Dynamic Programming, String· 2 companies
943. Find the Shortest SuperstringVideo
Solution45.8%Hard
Array, Bit Manipulation +3· 2 companies
960. Delete Columns to Make Sorted IIIVideo
Solution72.7%Hard
Array, Dynamic Programming +1· 2 companies
972. Equal Rational NumbersVideo
Solution47.9%Hard
Math, String· 2 companies
1028. Recover a Tree From Preorder TraversalVideo
Solution83.2%Hard
Binary Tree, Depth-First Search +2· 6 companies
1032. Stream of CharactersVideo
Solution52.8%Hard
Array, Data Stream +3· 4 companies
1044. Longest Duplicate SubstringVideo
Solution31.1%Hard
Binary Search, Hash Function +4· 7 companies
1092. Shortest Common Supersequence Video
Solution62.4%Hard
Dynamic Programming, String· 5 companies
1096. Brace Expansion IIVideo
Solution79.2%Hard
Backtracking, Breadth-First Search +2· 1 company
1106. Parsing A Boolean ExpressionVideo
Solution69.8%Hard
Recursion, Stack +1· 8 companies
1147. Longest Chunked Palindrome DecompositionVideo
Solution58.6%Hard
Dynamic Programming, Greedy +4· 1 company
1153. String Transforms Into Another StringVideoPremium
Solution34.9%Hard
Hash Table, String· 1 company
1163. Last Substring in Lexicographical OrderVideo
Solution35.1%Hard
String, Two Pointers· 5 companies
1178. Number of Valid Words for Each PuzzleVideo
Solution47.8%Hard
Array, Bit Manipulation +3· 1 company
1216. Valid Palindrome IIIVideoPremium
Solution49.2%Hard
Dynamic Programming, String· 3 companies
1255. Maximum Score Words Formed by LettersVideo
Solution81.9%Hard
Array, Backtracking +4· 3 companies
1278. Palindrome Partitioning IIIVideo
Solution62.2%Hard
Dynamic Programming, String
1307. Verbal Arithmetic PuzzleVideo
Solution33.5%Hard
Array, Backtracking +2· 3 companies
1312. Minimum Insertion Steps to Make a String PalindromeVideo
Solution74.3%Hard
Dynamic Programming, String· 7 companies
1316. Distinct Echo SubstringsVideo
Solution53.7%Hard
Hash Function, Rolling Hash +2· 1 company
1320. Minimum Distance to Type a Word Using Two FingersVideo
Solution72.2%Hard
Dynamic Programming, String· 2 companies
1392. Longest Happy PrefixVideo
Solution54.1%Hard
Hash Function, Rolling Hash +2· 6 companies
1397. Find All Good StringsVideo
Solution46.4%Hard
Dynamic Programming, String +1· 2 companies
1416. Restore The ArrayVideo
Solution47.2%Hard
Dynamic Programming, String· 2 companies
1505. Minimum Possible Integer After at Most K Adjacent Swaps On DigitsVideo
Solution41.8%Hard
Binary Indexed Tree, Greedy +2· 1 company
1520. Maximum Number of Non-Overlapping SubstringsVideo
Solution65.0%Hard
Greedy, String· 1 company
1531. String Compression IIVideo
Solution52.2%Hard
Dynamic Programming, String· 5 companies
1542. Find Longest Awesome SubstringVideo
Solution47.4%Hard
Bit Manipulation, Hash Table +1· 1 company
1585. Check If String Is Transformable With Substring Sort OperationsVideo
Solution51.9%Hard
Greedy, Sorting +1· 1 company
1597. Build Binary Expression Tree From Infix ExpressionVideoPremium
–62.5%Hard
Binary Tree, Stack +2· 1 company
1639. Number of Ways to Form a Target String Given a DictionaryVideo
Solution56.6%Hard
Array, Dynamic Programming +1· 9 companies
1745. Palindrome Partitioning IVVideo
Solution45.8%Hard
Dynamic Programming, String· 1 company
1771. Maximize Palindrome Length From SubsequencesVideo
Solution39.0%Hard
Dynamic Programming, String· 1 company
1830. Minimum Number of Operations to Make String SortedVideo
Solution50.4%Hard
Combinatorics, Math +1· 1 company
1842. Next Palindrome Using Same DigitsVideoPremium
Solution54.2%Hard
String, Two Pointers· 1 company
1896. Minimum Cost to Change the Final Value of ExpressionVideo
Solution50.0%Hard
Dynamic Programming, Math +2· 1 company
1948. Delete Duplicate Folders in SystemVideo
Solution77.7%Hard
Array, Hash Function +3· 6 companies
1960. Maximum Product of the Length of Two Palindromic SubstringsVideo
Solution32.1%Hard
Hash Function, Rolling Hash +1
1977. Number of Ways to Separate NumbersVideo
Solution21.7%Hard
Dynamic Programming, String +1· 1 company
1987. Number of Unique Good SubsequencesVideo
Solution52.7%Hard
Dynamic Programming, String· 2 companies
2014. Longest Subsequence Repeated k TimesVideo
Solution71.3%Hard
Backtracking, Counting +3· 3 companies
2019. The Score of Students Solving Math ExpressionVideo
Solution34.8%Hard
Array, Dynamic Programming +4· 2 companies
Showing 51–100 of 191