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Problems

332 problems

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

Hard · 332 results

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TitleSolutionAcceptDifficultyTopics
10. Regular Expression MatchingVideo
Solution31.8%Hard
Dynamic Programming, Recursion +1· 25 companies
32. Longest Valid ParenthesesVideo
Solution41.2%Hard
Dynamic Programming, Stack +1· 25 companies
42. Trapping Rain WaterVideo
Solution68.2%Hard
Array, Dynamic Programming +3· 73 companies
44. Wildcard MatchingVideo
Solution32.8%Hard
Dynamic Programming, Greedy +2· 17 companies
85. Maximal RectangleVideo
Solution60.1%Hard
Array, Dynamic Programming +3· 15 companies
87. Scramble StringVideo
Solution45.9%Hard
Dynamic Programming, String· 6 companies
115. Distinct SubsequencesVideo
Solution54.1%Hard
Dynamic Programming, String· 13 companies
123. Best Time to Buy and Sell Stock IIIVideo
Solution54.5%Hard
Array, Dynamic Programming· 13 companies
124. Binary Tree Maximum Path SumVideo
Solution42.7%Hard
Binary Tree, Depth-First Search +2· 25 companies
132. Palindrome Partitioning IIVideo
Solution37.9%Hard
Dynamic Programming, String· 9 companies
140. Word Break IIVideo
Solution56.4%Hard
Array, Backtracking +5· 16 companies
174. Dungeon GameVideo
Solution42.2%Hard
Array, Dynamic Programming +1· 8 companies
188. Best Time to Buy and Sell Stock IVVideo
Solution51.5%Hard
Array, Dynamic Programming· 11 companies
233. Number of Digit OneVideo
Solution39.9%Hard
Dynamic Programming, Math +1· 6 companies
265. Paint House IIVideoPremium
Solution57.0%Hard
Array, Dynamic Programming· 2 companies
312. Burst BalloonsVideo
Solution64.3%Hard
Array, Dynamic Programming· 15 companies
329. Longest Increasing Path in a MatrixVideo
Solution57.0%Hard
Array, Breadth-First Search +6· 16 companies
354. Russian Doll EnvelopesVideo
Solution37.8%Hard
Array, Binary Search +2· 13 companies
403. Frog JumpVideo
Solution47.8%Hard
Array, Dynamic Programming· 11 companies
410. Split Array Largest SumVideo
Solution61.2%Hard
Array, Binary Search +3· 20 companies
446. Arithmetic Slices II - SubsequenceVideo
Solution55.1%Hard
Array, Dynamic Programming· 4 companies
458. Poor PigsVideo
Solution59.4%Hard
Combinatorics, Dynamic Programming +1· 1 company
465. Optimal Account BalancingVideoPremium
Solution50.9%Hard
Array, Backtracking +3· 12 companies
466. Count The RepetitionsVideo
Solution36.0%Hard
Dynamic Programming, String· 1 company
471. Encode String with Shortest LengthVideoPremium
Solution50.5%Hard
Dynamic Programming, String· 1 company
472. Concatenated WordsVideo
Solution49.9%Hard
Array, Depth-First Search +3· 3 companies
488. Zuma GameVideo
Solution29.4%Hard
Breadth-First Search, Dynamic Programming +3· 7 companies
514. Freedom TrailVideo
Solution59.4%Hard
Breadth-First Search, Depth-First Search +2· 3 companies
546. Remove BoxesVideo
Solution49.4%Hard
Array, Dynamic Programming +1· 12 companies
552. Student Attendance Record IIVideo
Solution57.1%Hard
Dynamic Programming· 3 companies
568. Maximum Vacation DaysVideoPremium
Solution46.7%Hard
Array, Dynamic Programming +1· 3 companies
600. Non-negative Integers without Consecutive OnesVideo
Solution43.1%Hard
Dynamic Programming· 5 companies
629. K Inverse Pairs ArrayVideo
Solution49.2%Hard
Dynamic Programming· 4 companies
639. Decode Ways IIVideo
Solution32.4%Hard
Dynamic Programming, String· 3 companies
656. Coin PathVideoPremium
Solution34.2%Hard
Array, Dynamic Programming· 1 company
664. Strange PrinterVideo
Solution61.0%Hard
Dynamic Programming, String· 9 companies
689. Maximum Sum of 3 Non-Overlapping SubarraysVideo
Solution59.8%Hard
Array, Dynamic Programming· 6 companies
691. Stickers to Spell WordVideo
Solution51.3%Hard
Array, Backtracking +4· 4 companies
727. Minimum Window SubsequenceVideoPremium
Solution43.5%Hard
Dynamic Programming, Sliding Window +1· 5 companies
730. Count Different Palindromic SubsequencesVideo
Solution48.2%Hard
Dynamic Programming, String· 4 companies
741. Cherry PickupVideo
Solution40.4%Hard
Array, Dynamic Programming +1· 10 companies
773. Sliding PuzzleVideo
Solution74.3%Hard
Array, Backtracking +4· 7 companies
801. Minimum Swaps To Make Sequences IncreasingVideo
Solution42.0%Hard
Array, Dynamic Programming· 5 companies
805. Split Array With Same AverageVideo
Solution27.5%Hard
Array, Bit Manipulation +3· 6 companies
818. Race CarVideo
Solution45.3%Hard
Dynamic Programming· 5 companies
828. Count Unique Characters of All Substrings of a Given StringVideo
Solution54.1%Hard
Dynamic Programming, Hash Table +1· 3 companies
834. Sum of Distances in TreeVideo
Solution65.8%Hard
Depth-First Search, Dynamic Programming +2· 5 companies
847. Shortest Path Visiting All NodesVideo
Solution66.5%Hard
Bit Manipulation, Bitmask +3· 4 companies
871. Minimum Number of Refueling StopsVideo
Solution41.8%Hard
Array, Dynamic Programming +2· 7 companies
879. Profitable SchemesVideo
Solution48.7%Hard
Array, Dynamic Programming· 2 companies
Showing 1–50 of 332