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Striver’s SDE Sheet

SDE Sheet contains very handily crafted and picked top coding interview questions from different topics of Data Structures & Algorithms. These questions are one of the most asked coding interview questions in coding interviews of companies like Google, Amazon, Microsoft, Facebook, Swiggy, Flipkart, etc, and cover almost all of the concepts related to Data Structure & Algorithms.

By Azhar Khan122 problems35 Easy69 Medium18 Hard5 followersUpdated 28 May 2025

Start: Set Matrix Zeroes

122problems

35Easy

69Medium

18Hard

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

TitleSolutionAcceptDifficultyTopics

73. Set Matrix ZeroesVideo

Solution63.8%Medium

Array, Hash Table +1· 22 companies

118. Pascal's TriangleVideo

Solution79.4%Easy

Array, Dynamic Programming· 17 companies

31. Next PermutationVideo

Solution46.1%Medium

Array, Two Pointers· 31 companies

53. Maximum SubarrayVideo

Solution53.7%Medium

Array, Divide and Conquer +1· 64 companies

75. Sort ColorsVideo

Solution69.9%Medium

Array, Sorting +1· 37 companies

121. Best Time to Buy and Sell StockVideo

Solution57.1%Easy

Array, Dynamic Programming· 92 companies

48. Rotate ImageVideo

Solution80.7%Medium

Array, Math +1· 36 companies

56. Merge IntervalsVideo

Solution52.6%Medium

Array, Sorting· 112 companies

88. Merge Sorted ArrayVideo

Solution55.7%Easy

Array, Sorting +1· 37 companies

287. Find the Duplicate NumberVideo

Solution64.7%Medium

Array, Binary Search +2· 22 companies

74. Search a 2D MatrixVideo

Solution54.4%Medium

Array, Binary Search +1· 19 companies

50. Pow(x, n)Video

Solution39.0%Medium

Math, Recursion· 22 companies

169. Majority ElementVideo

Solution66.2%Easy

Array, Counting +3· 22 companies

229. Majority Element IIVideo

Solution56.5%Medium

Array, Counting +2· 9 companies

62. Unique PathsVideo

Solution67.3%Medium

Combinatorics, Dynamic Programming +1· 21 companies

493. Reverse PairsVideo

Solution35.1%Hard

Array, Binary Indexed Tree +5· 9 companies

1. Two SumVideo

Solution57.8%Easy

Array, Hash Table· 127 companies

18. 4SumVideo

Solution42.0%Medium

Array, Sorting +1· 20 companies

128. Longest Consecutive SequenceVideo

Solution47.0%Medium

Array, Hash Table +1· 40 companies

3. Longest Substring Without Repeating CharactersVideo

Solution39.9%Medium

Hash Table, Sliding Window +1· 104 companies

206. Reverse Linked ListVideo

Solution81.0%Easy

Linked List, Recursion· 34 companies

876. Middle of the Linked ListVideo

Solution82.3%Easy

Linked List, Two Pointers· 13 companies

21. Merge Two Sorted ListsVideo

Solution68.7%Easy

Linked List, Recursion· 36 companies

19. Remove Nth Node From End of ListVideo

Solution52.4%Medium

Linked List, Two Pointers· 18 companies

2. Add Two NumbersVideo

Solution49.3%Medium

Linked List, Math +1· 37 companies

237. Delete Node in a Linked ListVideo

Solution84.3%Medium

Linked List· 10 companies

160. Intersection of Two Linked ListsVideo

Solution64.6%Easy

Hash Table, Linked List +1· 13 companies

141. Linked List CycleVideo

Solution55.2%Easy

Hash Table, Linked List +1· 24 companies

25. Reverse Nodes in k-GroupVideo

Solution67.4%Hard

Linked List, Recursion· 27 companies

234. Palindrome Linked ListVideo

Solution58.8%Easy

Linked List, Recursion +2· 17 companies

142. Linked List Cycle IIVideo

Solution59.3%Medium

Hash Table, Linked List +1· 13 companies

61. Rotate ListVideo

Solution43.1%Medium

Linked List, Two Pointers· 9 companies

138. Copy List with Random PointerVideo

Solution63.8%Medium

Hash Table, Linked List· 22 companies

15. 3SumVideo

Solution40.1%Medium

Array, Sorting +1· 57 companies

42. Trapping Rain WaterVideo

Solution68.2%Hard

Array, Dynamic Programming +3· 73 companies

26. Remove Duplicates from Sorted ArrayVideo

Solution63.7%Easy

Array, Two Pointers· 26 companies

485. Max Consecutive OnesVideo

Solution66.0%Easy

Array· 14 companies

455. Assign CookiesVideo

Solution55.4%Easy

Array, Greedy +2· 9 companies

90. Subsets IIVideo

Solution61.7%Medium

Array, Backtracking +1· 9 companies

39. Combination SumVideo

Solution76.9%Medium

Array, Backtracking· 26 companies

40. Combination Sum IIVideo

Solution60.3%Medium

Array, Backtracking· 15 companies

131. Palindrome PartitioningVideo

Solution74.4%Medium

Backtracking, Dynamic Programming +1· 10 companies

60. Permutation SequenceVideo

Solution54.3%Hard

Math, Recursion· 7 companies

46. PermutationsVideo

Solution82.3%Medium

Array, Backtracking· 25 companies

51. N-QueensVideo

Solution76.3%Hard

Array, Backtracking· 16 companies

37. Sudoku SolverVideo

Solution65.4%Hard

Array, Backtracking +2· 17 companies

540. Single Element in a Sorted ArrayVideo

Solution59.3%Medium

Array, Binary Search· 19 companies

33. Search in Rotated Sorted ArrayVideo

Solution45.5%Medium

Array, Binary Search· 53 companies

4. Median of Two Sorted ArraysVideo

Solution47.9%Hard

Array, Binary Search +1· 45 companies

215. Kth Largest Element in an ArrayVideo

Solution69.4%Medium

Array, Divide and Conquer +3· 41 companies

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

347. Top K Frequent ElementsVideo

Solution67.3%Medium

Array, Bucket Sort +6· 53 companies

225. Implement Stack using QueuesVideo

Solution70.1%Easy

Design, Queue +1· 9 companies

232. Implement Queue using StacksVideo

Solution70.2%Easy

Design, Queue +1· 12 companies

20. Valid ParenthesesVideo

Solution45.2%Easy

Stack, String· 113 companies

496. Next Greater Element IVideo

Solution76.5%Easy

Array, Hash Table +2· 17 companies

146. LRU CacheVideo

Solution48.2%Medium

Design, Doubly-Linked List +2· 120 companies

460. LFU CacheVideo

Solution50.6%Hard

Design, Doubly-Linked List +2· 32 companies

84. Largest Rectangle in HistogramVideo

Solution50.7%Hard

Array, Monotonic Stack +1· 30 companies

239. Sliding Window MaximumVideo

Solution49.1%Hard

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

155. Min StackVideo

Solution58.5%Medium

Design, Stack· 37 companies

994. Rotting OrangesVideo

Solution59.5%Medium

Array, Breadth-First Search +1· 52 companies

901. Online Stock SpanVideo

Solution69.5%Medium

Data Stream, Design +2· 7 companies

277. Find the CelebrityVideoPremium

Solution48.9%Medium

Graph, Interactive +1· 12 companies

151. Reverse Words in a StringVideo

Solution57.8%Medium

String, Two Pointers· 30 companies

5. Longest Palindromic SubstringVideo

Solution38.7%Medium

Dynamic Programming, String +1· 81 companies

13. Roman to IntegerVideo

Solution67.0%Easy

Hash Table, Math +1· 36 companies

8. String to Integer (atoi)Video

Solution21.4%Medium

String· 21 companies

14. Longest Common PrefixVideo

Solution48.6%Easy

String, Trie· 60 companies

686. Repeated String MatchVideo

Solution39.7%Medium

String, String Matching· 6 companies

28. Find the Index of the First Occurrence in a StringVideo

Solution47.0%Easy

String, String Matching +1· 16 companies

242. Valid AnagramVideo

Solution68.5%Easy

Hash Table, Sorting +1· 40 companies

38. Count and SayVideo

Solution63.7%Medium

String· 13 companies

165. Compare Version NumbersVideo

Solution46.8%Medium

String, Two Pointers· 11 companies

94. Binary Tree Inorder TraversalVideo

Solution80.4%Easy

Binary Tree, Depth-First Search +2· 7 companies

144. Binary Tree Preorder TraversalVideo

Solution76.6%Easy

Binary Tree, Depth-First Search +2· 5 companies

145. Binary Tree Postorder TraversalVideo

Solution79.0%Easy

Binary Tree, Depth-First Search +2· 5 companies

987. Vertical Order Traversal of a Binary TreeVideo

Solution54.6%Hard

Binary Tree, Breadth-First Search +4· 15 companies

662. Maximum Width of Binary TreeVideo

Solution46.0%Medium

Binary Tree, Breadth-First Search +2· 8 companies

102. Binary Tree Level Order TraversalVideo

Solution73.5%Medium

Binary Tree, Breadth-First Search +1· 16 companies

104. Maximum Depth of Binary TreeVideo

Solution78.6%Easy

Binary Tree, Breadth-First Search +2· 17 companies

543. Diameter of Binary TreeVideo

Solution66.4%Easy

Binary Tree, Depth-First Search +1· 20 companies

110. Balanced Binary TreeVideo

Solution59.2%Easy

Binary Tree, Depth-First Search +1· 9 companies

236. Lowest Common Ancestor of a Binary TreeVideo

Solution70.1%Medium

Binary Tree, Depth-First Search +1· 22 companies

100. Same TreeVideo

Solution68.0%Easy

Binary Tree, Breadth-First Search +2· 9 companies

103. Binary Tree Zigzag Level Order TraversalVideo

Solution64.4%Medium

Binary Tree, Breadth-First Search +1· 19 companies

545. Boundary of Binary TreeVideoPremium

Solution48.0%Medium

Binary Tree, Depth-First Search +1· 10 companies

124. Binary Tree Maximum Path SumVideo

Solution42.7%Hard

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

105. Construct Binary Tree from Preorder and Inorder TraversalVideo

Solution69.7%Medium

Array, Binary Tree +3· 9 companies

106. Construct Binary Tree from Inorder and Postorder TraversalVideo

Solution69.4%Medium

Array, Binary Tree +3· 7 companies

101. Symmetric TreeVideo

Solution62.1%Easy

Binary Tree, Breadth-First Search +2· 11 companies

114. Flatten Binary Tree to Linked ListVideo

Solution71.6%Medium

Binary Tree, Depth-First Search +3· 8 companies

116. Populating Next Right Pointers in Each NodeVideo

Solution67.6%Medium

Binary Tree, Breadth-First Search +3· 8 companies

700. Search in a Binary Search TreeVideo

Solution83.1%Easy

Binary Search Tree, Binary Tree +1· 5 companies

108. Convert Sorted Array to Binary Search TreeVideo

Solution75.9%Easy

Array, Binary Search Tree +3· 9 companies

1008. Construct Binary Search Tree from Preorder TraversalVideo

Solution84.7%Medium

Array, Binary Search Tree +4· 5 companies

98. Validate Binary Search TreeVideo

Solution36.1%Medium

Binary Search Tree, Binary Tree +2· 18 companies

235. Lowest Common Ancestor of a Binary Search TreeVideo

Solution71.4%Medium

Binary Search Tree, Binary Tree +2· 10 companies

230. Kth Smallest Element in a BSTVideo

Solution77.2%Medium

Binary Search Tree, Binary Tree +2· 12 companies

653. Two Sum IV - Input is a BSTVideo

Solution63.7%Easy

Binary Search Tree, Binary Tree +5· 8 companies

173. Binary Search Tree IteratorVideo

Solution76.9%Medium

Binary Search Tree, Binary Tree +4· 8 companies

1373. Maximum Sum BST in Binary TreeVideo

Solution48.9%Hard

Binary Search Tree, Binary Tree +3· 5 companies

297. Serialize and Deserialize Binary TreeVideo

Solution61.1%Hard

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

703. Kth Largest Element in a StreamVideo

Solution61.4%Easy

Binary Search Tree, Binary Tree +4· 11 companies

733. Flood FillVideo

Solution68.6%Easy

Array, Breadth-First Search +2· 12 companies

133. Clone GraphVideo

Solution66.1%Medium

Breadth-First Search, Depth-First Search +2· 18 companies

207. Course ScheduleVideo

Solution52.2%Medium

Breadth-First Search, Depth-First Search +2· 45 companies

200. Number of IslandsVideo

Solution65.2%Medium

Array, Breadth-First Search +3· 86 companies

785. Is Graph Bipartite?Video

Solution59.6%Medium

Breadth-First Search, Depth-First Search +2· 11 companies

1520. Maximum Number of Non-Overlapping SubstringsVideo

Solution65.0%Hard

Greedy, String· 1 company

152. Maximum Product SubarrayVideo

Solution37.3%Medium

Array, Dynamic Programming· 23 companies

300. Longest Increasing SubsequenceVideo

Solution59.8%Medium

Array, Binary Search +1· 30 companies

1143. Longest Common SubsequenceVideo

Solution59.6%Medium

Dynamic Programming, String· 19 companies

72. Edit DistanceVideo

Solution61.5%Medium

Dynamic Programming, String· 24 companies

64. Minimum Path SumVideo

Solution68.6%Medium

Array, Dynamic Programming +1· 17 companies

322. Coin ChangeVideo

Solution49.3%Medium

Array, Breadth-First Search +1· 40 companies

416. Partition Equal Subset SumVideo

Solution49.9%Medium

Array, Dynamic Programming· 16 companies

1547. Minimum Cost to Cut a StickVideo

Solution63.5%Hard

Array, Dynamic Programming +1· 8 companies

139. Word BreakVideo

Solution49.8%Medium

Array, Dynamic Programming +4· 32 companies

208. Implement Trie (Prefix Tree)Video

Solution69.9%Medium

Design, Hash Table +2· 21 companies

421. Maximum XOR of Two Numbers in an ArrayVideo

Solution53.8%Medium

Array, Bit Manipulation +2· 5 companies

1707. Maximum XOR With an Element From ArrayVideo

Solution59.6%Hard

Array, Bit Manipulation +1· 1 company

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