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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.

Showing 69 of 122 problems · Medium · Clear

TitleSolutionAcceptDifficultyTopics

73. Set Matrix ZeroesVideo

Solution63.8%Medium

Array, Hash Table +1· 22 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

48. Rotate ImageVideo

Solution80.7%Medium

Array, Math +1· 36 companies

56. Merge IntervalsVideo

Solution52.6%Medium

Array, Sorting· 112 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

229. Majority Element IIVideo

Solution56.5%Medium

Array, Counting +2· 9 companies

62. Unique PathsVideo

Solution67.3%Medium

Combinatorics, Dynamic Programming +1· 21 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

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

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

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

46. PermutationsVideo

Solution82.3%Medium

Array, Backtracking· 25 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

215. Kth Largest Element in an ArrayVideo

Solution69.4%Medium

Array, Divide and Conquer +3· 41 companies

347. Top K Frequent ElementsVideo

Solution67.3%Medium

Array, Bucket Sort +6· 53 companies

146. LRU CacheVideo

Solution48.2%Medium

Design, Doubly-Linked List +2· 120 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

8. String to Integer (atoi)Video

Solution21.4%Medium

String· 21 companies

686. Repeated String MatchVideo

Solution39.7%Medium

String, String Matching· 6 companies

38. Count and SayVideo

Solution63.7%Medium

String· 13 companies

165. Compare Version NumbersVideo

Solution46.8%Medium

String, Two Pointers· 11 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

236. Lowest Common Ancestor of a Binary TreeVideo

Solution70.1%Medium

Binary Tree, Depth-First Search +1· 22 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

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

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

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

173. Binary Search Tree IteratorVideo

Solution76.9%Medium

Binary Search Tree, Binary Tree +4· 8 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

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

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

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