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32 problems

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Two Pointers Array578 Dynamic Programming332 String191 Math187 Binary Search136 Hash Table134 Sorting106 Greedy104 Bit Manipulation103 Graph96 Depth-First Search91 Heap (Priority Queue)78 Prefix Sum77 Matrix75 Breadth-First Search71 All topics

Hard · 32 results

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TitleSolutionAcceptDifficultyTopics

42. Trapping Rain WaterVideo

Solution68.2%Hard

Array, Dynamic Programming +3· 73 companies

272. Closest Binary Search Tree Value IIVideoPremium

Solution61.1%Hard

Binary Search Tree, Binary Tree +5· 3 companies

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

321. Create Maximum NumberVideo

Solution37.3%Hard

Array, Greedy +3· 7 companies

719. Find K-th Smallest Pair DistanceVideo

Solution46.4%Hard

Array, Binary Search +2· 5 companies

1147. Longest Chunked Palindrome DecompositionVideo

Solution58.6%Hard

Dynamic Programming, Greedy +4· 1 company

1163. Last Substring in Lexicographical OrderVideo

Solution35.1%Hard

String, Two Pointers· 5 companies

1537. Get the Maximum ScoreVideo

Solution41.5%Hard

Array, Dynamic Programming +2· 5 companies

1697. Checking Existence of Edge Length Limited PathsVideo

Solution63.8%Hard

Array, Graph +3· 3 companies

1755. Closest Subsequence SumVideo

Solution45.3%Hard

Array, Bit Manipulation +3· 3 companies

1782. Count Pairs Of NodesVideo

Solution43.3%Hard

Array, Binary Search +3· 1 company

1793. Maximum Score of a Good SubarrayVideo

Solution64.3%Hard

Array, Binary Search +3· 2 companies

1842. Next Palindrome Using Same DigitsVideoPremium

Solution54.2%Hard

String, Two Pointers· 1 company

2035. Partition Array Into Two Arrays to Minimize Sum DifferenceVideo

Solution24.4%Hard

Array, Binary Search +5· 9 companies

2122. Recover the Original ArrayVideo

Solution42.0%Hard

Array, Enumeration +3· 1 company

2193. Minimum Number of Moves to Make PalindromeVideo

Solution52.7%Hard

Binary Indexed Tree, Greedy +2· 5 companies

2234. Maximum Total Beauty of the GardensVideo

Solution30.4%Hard

Array, Binary Search +3· 1 company

2472. Maximum Number of Non-overlapping Palindrome SubstringsVideo

Solution60.9%Hard

Dynamic Programming, Greedy +2· 5 companies

2503. Maximum Number of Points From Grid QueriesVideo

Solution59.3%Hard

Array, Breadth-First Search +5· 6 companies

2565. Subsequence With the Minimum ScoreVideo

Solution33.8%Hard

Binary Search, String +1· 1 company

2604. Minimum Time to Eat All GrainsVideoPremium

Solution40.8%Hard

Array, Binary Search +2· 1 company

2868. The Wording GamePremium

Solution53.6%Hard

Array, Game Theory +4

2911. Minimum Changes to Make K Semi-palindromesVideo

Solution35.3%Hard

Dynamic Programming, String +1

2972. Count the Number of Incremovable Subarrays IIVideo

Solution39.8%Hard

Array, Binary Search +1· 3 companies

3008. Find Beautiful Indices in the Given Array IIVideo

Solution28.3%Hard

Binary Search, Hash Function +4· 3 companies

3406. Find the Lexicographically Largest String From the Box IIVideoPremium

Solution48.9%Hard

String, Two Pointers

3455. Shortest Matching SubstringVideo

Solution24.5%Hard

Binary Search, String +2· 1 company

3504. Longest Palindrome After Substring Concatenation IIVideo

Solution18.4%Hard

Dynamic Programming, String +1· 1 company

3534. Path Existence Queries in a Graph IIVideo

Solution64.2%Hard

Array, Binary Search +6· 4 companies

3734. Lexicographically Smallest Palindromic Permutation Greater Than TargetVideo

Solution55.3%Hard

Enumeration, String +1

3801. Minimum Cost to Merge Sorted ListsVideo

Solution33.8%Hard

Array, Binary Search +3

3999. Minimum Number of String Groups Through TransformationsVideo

–47.9%Hard

Hash Table, String +1

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