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Striver SDE SheetOfficial

Striver's curated list of top coding interview problems. 180+ handpicked problems covering all DSA topics asked at Amazon, Google, Microsoft, and more.

By FleetCode115 problems32 Easy67 Medium16 HardUpdated 23 Mar 2026

Start: Set Matrix Zeroes

115problems

32Easy

67Medium

16Hard

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

3193. Count the Number of InversionsVideo

Solution31.9%Hard

Array, Dynamic Programming· 5 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

430. Flatten a Multilevel Doubly Linked ListVideo

Solution63.3%Medium

Depth-First Search, Doubly-Linked List +1· 6 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

322. Coin ChangeVideo

Solution49.3%Medium

Array, Breadth-First Search +1· 40 companies

455. Assign CookiesVideo

Solution55.4%Easy

Array, Greedy +2· 9 companies

1982. Find Array Given Subset SumsVideo

Solution49.7%Hard

Array, Divide and Conquer· 1 company

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

139. Word BreakVideo

Solution49.8%Medium

Array, Dynamic Programming +4· 32 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

23. Merge k Sorted ListsVideo

Solution60.3%Hard

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

503. Next Greater Element IIVideo

Solution69.3%Medium

Array, Monotonic Stack +1· 16 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

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

14. Longest Common PrefixVideo

Solution48.6%Easy

String, Trie· 60 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

199. Binary Tree Right Side ViewVideo

Solution71.5%Medium

Binary Tree, Breadth-First Search +2· 14 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

285. Inorder Successor in BSTVideoPremium

Solution51.2%Medium

Binary Search Tree, Binary Tree +2· 6 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

333. Largest BST SubtreeVideoPremium

Solution45.8%Medium

Binary Search Tree, Binary Tree +3· 2 companies

133. Clone GraphVideo

Solution66.1%Medium

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

200. Number of IslandsVideo

Solution65.2%Medium

Array, Breadth-First Search +3· 86 companies

207. Course ScheduleVideo

Solution52.2%Medium

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

210. Course Schedule IIVideo

Solution56.3%Medium

Breadth-First Search, Depth-First Search +2· 36 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

132. Palindrome Partitioning IIVideo

Solution37.9%Hard

Dynamic Programming, String· 9 companies

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