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Strivers A2Z DSAOfficial

This sheet is made for people who want to learn DSA from A to Z for free in a well-organized and structured manner.

By FleetCode249 problems52 Easy154 Medium43 Hard37 followersUpdated 28 May 2025

Start: Reverse Integer

249problems

52Easy

154Medium

43Hard

Signed in, the sheet shows which of these you have solved.

Showing 43 of 249 problems · Hard · Clear

TitleSolutionAcceptDifficultyTopics

493. Reverse PairsVideo

Solution35.1%Hard

Array, Binary Indexed Tree +5· 9 companies

410. Split Array Largest SumVideo

Solution61.2%Hard

Array, Binary Search +3· 20 companies

774. Minimize Max Distance to Gas StationVideoPremium

Solution53.9%Hard

Array, Binary Search· 2 companies

4. Median of Two Sorted ArraysVideo

Solution47.9%Hard

Array, Binary Search +1· 45 companies

25. Reverse Nodes in k-GroupVideo

Solution67.4%Hard

Linked List, Recursion· 27 companies

51. N-QueensVideo

Solution76.3%Hard

Array, Backtracking· 16 companies

37. Sudoku SolverVideo

Solution65.4%Hard

Array, Backtracking +2· 17 companies

282. Expression Add OperatorsVideo

Solution43.5%Hard

Backtracking, Math +1· 7 companies

42. Trapping Rain WaterVideo

Solution68.2%Hard

Array, Dynamic Programming +3· 73 companies

84. Largest Rectangle in HistogramVideo

Solution50.7%Hard

Array, Monotonic Stack +1· 30 companies

85. Maximal RectangleVideo

Solution60.1%Hard

Array, Dynamic Programming +3· 15 companies

239. Sliding Window MaximumVideo

Solution49.1%Hard

Array, Heap (Priority Queue) +3· 48 companies

460. LFU CacheVideo

Solution50.6%Hard

Design, Doubly-Linked List +2· 32 companies

992. Subarrays with K Different IntegersVideo

Solution69.0%Hard

Array, Counting +2· 18 companies

76. Minimum Window SubstringVideo

Solution48.3%Hard

Hash Table, Sliding Window +1· 35 companies

727. Minimum Window SubsequenceVideoPremium

Solution43.5%Hard

Dynamic Programming, Sliding Window +1· 5 companies

23. Merge k Sorted ListsVideo

Solution60.3%Hard

Divide and Conquer, Heap (Priority Queue) +2· 50 companies

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

135. CandyVideo

Solution49.3%Hard

Array, Greedy· 24 companies

124. Binary Tree Maximum Path SumVideo

Solution42.7%Hard

Binary Tree, Depth-First Search +2· 25 companies

297. Serialize and Deserialize Binary TreeVideo

Solution61.1%Hard

Binary Tree, Breadth-First Search +4· 23 companies

127. Word LadderVideo

Solution46.3%Hard

Breadth-First Search, Hash Table +1· 41 companies

126. Word Ladder IIVideo

Solution27.7%Hard

Backtracking, Breadth-First Search +2· 15 companies

711. Number of Distinct Islands IIVideoPremium

Solution55.3%Hard

Breadth-First Search, Depth-First Search +3· 2 companies

269. Alien DictionaryVideoPremium

Solution37.1%Hard

Array, Breadth-First Search +4· 18 companies

305. Number of Islands IIVideoPremium

Solution40.5%Hard

Array, Hash Table +1· 10 companies

827. Making A Large IslandVideo

Solution57.0%Hard

Array, Breadth-First Search +3· 16 companies

778. Swim in Rising WaterVideo

Solution68.3%Hard

Array, Binary Search +5· 8 companies

1192. Critical Connections in a NetworkVideo

Solution60.6%Hard

Biconnected Component, Depth-First Search +1· 8 companies

1707. Maximum XOR With an Element From ArrayVideo

Solution59.6%Hard

Array, Bit Manipulation +1· 1 company

214. Shortest PalindromeVideo

Solution43.3%Hard

Hash Function, Rolling Hash +2· 8 companies

1392. Longest Happy PrefixVideo

Solution54.1%Hard

Hash Function, Rolling Hash +2· 6 companies

2035. Partition Array Into Two Arrays to Minimize Sum DifferenceVideo

Solution24.4%Hard

Array, Binary Search +5· 9 companies

1312. Minimum Insertion Steps to Make a String PalindromeVideo

Solution74.3%Hard

Dynamic Programming, String· 7 companies

1092. Shortest Common Supersequence Video

Solution62.4%Hard

Dynamic Programming, String· 5 companies

115. Distinct SubsequencesVideo

Solution54.1%Hard

Dynamic Programming, String· 13 companies

44. Wildcard MatchingVideo

Solution32.8%Hard

Dynamic Programming, Greedy +2· 17 companies

123. Best Time to Buy and Sell Stock IIIVideo

Solution54.5%Hard

Array, Dynamic Programming· 13 companies

188. Best Time to Buy and Sell Stock IVVideo

Solution51.5%Hard

Array, Dynamic Programming· 11 companies

1547. Minimum Cost to Cut a StickVideo

Solution63.5%Hard

Array, Dynamic Programming +1· 8 companies

312. Burst BalloonsVideo

Solution64.3%Hard

Array, Dynamic Programming· 15 companies

1106. Parsing A Boolean ExpressionVideo

Solution69.8%Hard

Recursion, Stack +1· 8 companies

132. Palindrome Partitioning IIVideo

Solution37.9%Hard

Dynamic Programming, String· 9 companies

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