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NeetCode 150Official

The Blind 75 plus 75 more essential problems. Covers every major data structure and algorithm pattern.

By FleetCode150 problems28 Easy101 Medium21 Hard23 followersUpdated 23 Mar 2026

Start: Contains Duplicate

150problems

28Easy

101Medium

21Hard

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

TitleSolutionAcceptDifficultyTopics

217. Contains DuplicateVideo

Solution64.8%Easy

Array, Hash Table +1· 20 companies

242. Valid AnagramVideo

Solution68.5%Easy

Hash Table, Sorting +1· 40 companies

1. Two SumVideo

Solution57.8%Easy

Array, Hash Table· 127 companies

49. Group AnagramsVideo

Solution73.0%Medium

Array, Hash Table +2· 87 companies

347. Top K Frequent ElementsVideo

Solution67.3%Medium

Array, Bucket Sort +6· 53 companies

238. Product of Array Except SelfVideo

Solution69.3%Medium

Array, Prefix Sum· 40 companies

36. Valid SudokuVideo

Solution64.9%Medium

Array, Hash Table +1· 26 companies

271. Encode and Decode StringsVideoPremium

Solution51.9%Medium

Array, Design +1· 11 companies

128. Longest Consecutive SequenceVideo

Solution47.0%Medium

Array, Hash Table +1· 40 companies

125. Valid PalindromeVideo

Solution54.2%Easy

String, Two Pointers· 39 companies

167. Two Sum II - Input Array Is SortedVideo

Solution66.1%Medium

Array, Binary Search +1· 16 companies

15. 3SumVideo

Solution40.1%Medium

Array, Sorting +1· 57 companies

11. Container With Most WaterVideo

Solution60.9%Medium

Array, Greedy +1· 57 companies

42. Trapping Rain WaterVideo

Solution68.2%Hard

Array, Dynamic Programming +3· 73 companies

121. Best Time to Buy and Sell StockVideo

Solution57.1%Easy

Array, Dynamic Programming· 92 companies

3. Longest Substring Without Repeating CharactersVideo

Solution39.9%Medium

Hash Table, Sliding Window +1· 104 companies

424. Longest Repeating Character ReplacementVideo

Solution60.4%Medium

Hash Table, Sliding Window +1· 22 companies

567. Permutation in StringVideo

Solution49.8%Medium

Hash Table, Sliding Window +2· 16 companies

76. Minimum Window SubstringVideo

Solution48.3%Hard

Hash Table, Sliding Window +1· 35 companies

239. Sliding Window MaximumVideo

Solution49.1%Hard

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

20. Valid ParenthesesVideo

Solution45.2%Easy

Stack, String· 113 companies

155. Min StackVideo

Solution58.5%Medium

Design, Stack· 37 companies

150. Evaluate Reverse Polish NotationVideo

Solution58.5%Medium

Array, Math +1· 18 companies

22. Generate ParenthesesVideo

Solution79.6%Medium

Backtracking, Dynamic Programming +1· 40 companies

739. Daily TemperaturesVideo

Solution69.1%Medium

Array, Monotonic Stack +1· 32 companies

853. Car FleetVideo

Solution55.5%Medium

Array, Monotonic Stack +2· 11 companies

84. Largest Rectangle in HistogramVideo

Solution50.7%Hard

Array, Monotonic Stack +1· 30 companies

704. Binary SearchVideo

Solution61.2%Easy

Array, Binary Search· 11 companies

74. Search a 2D MatrixVideo

Solution54.4%Medium

Array, Binary Search +1· 19 companies

875. Koko Eating BananasVideo

Solution50.4%Medium

Array, Binary Search· 47 companies

153. Find Minimum in Rotated Sorted ArrayVideo

Solution55.3%Medium

Array, Binary Search· 18 companies

33. Search in Rotated Sorted ArrayVideo

Solution45.5%Medium

Array, Binary Search· 53 companies

981. Time Based Key-Value StoreVideo

Solution49.8%Medium

Binary Search, Design +2· 34 companies

4. Median of Two Sorted ArraysVideo

Solution47.9%Hard

Array, Binary Search +1· 45 companies

206. Reverse Linked ListVideo

Solution81.0%Easy

Linked List, Recursion· 34 companies

21. Merge Two Sorted ListsVideo

Solution68.7%Easy

Linked List, Recursion· 36 companies

143. Reorder ListVideo

Solution66.6%Medium

Linked List, Recursion +2· 15 companies

19. Remove Nth Node From End of ListVideo

Solution52.4%Medium

Linked List, Two Pointers· 18 companies

138. Copy List with Random PointerVideo

Solution63.8%Medium

Hash Table, Linked List· 22 companies

2. Add Two NumbersVideo

Solution49.3%Medium

Linked List, Math +1· 37 companies

141. Linked List CycleVideo

Solution55.2%Easy

Hash Table, Linked List +1· 24 companies

287. Find the Duplicate NumberVideo

Solution64.7%Medium

Array, Binary Search +2· 22 companies

146. LRU CacheVideo

Solution48.2%Medium

Design, Doubly-Linked List +2· 120 companies

23. Merge k Sorted ListsVideo

Solution60.3%Hard

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

25. Reverse Nodes in k-GroupVideo

Solution67.4%Hard

Linked List, Recursion· 27 companies

226. Invert Binary TreeVideo

Solution80.5%Easy

Binary Tree, Breadth-First Search +2· 9 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

100. Same TreeVideo

Solution68.0%Easy

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

572. Subtree of Another TreeVideo

Solution52.0%Easy

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

235. Lowest Common Ancestor of a Binary Search TreeVideo

Solution71.4%Medium

Binary Search Tree, Binary Tree +2· 10 companies

102. Binary Tree Level Order TraversalVideo

Solution73.5%Medium

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

199. Binary Tree Right Side ViewVideo

Solution71.5%Medium

Binary Tree, Breadth-First Search +2· 14 companies

1448. Count Good Nodes in Binary TreeVideo

Solution73.8%Medium

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

98. Validate Binary Search TreeVideo

Solution36.1%Medium

Binary Search Tree, Binary Tree +2· 18 companies

230. Kth Smallest Element in a BSTVideo

Solution77.2%Medium

Binary Search Tree, Binary Tree +2· 12 companies

105. Construct Binary Tree from Preorder and Inorder TraversalVideo

Solution69.7%Medium

Array, Binary Tree +3· 9 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

208. Implement Trie (Prefix Tree)Video

Solution69.9%Medium

Design, Hash Table +2· 21 companies

211. Design Add and Search Words Data StructureVideo

Solution48.9%Medium

Depth-First Search, Design +2· 13 companies

212. Word Search IIVideo

Solution38.8%Hard

Array, Backtracking +3· 21 companies

703. Kth Largest Element in a StreamVideo

Solution61.4%Easy

Binary Search Tree, Binary Tree +4· 11 companies

1046. Last Stone WeightVideo

Solution66.4%Easy

Array, Heap (Priority Queue)· 13 companies

973. K Closest Points to OriginVideo

Solution69.4%Medium

Array, Divide and Conquer +5· 17 companies

215. Kth Largest Element in an ArrayVideo

Solution69.4%Medium

Array, Divide and Conquer +3· 41 companies

621. Task SchedulerVideo

Solution64.0%Medium

Array, Counting +4· 24 companies

355. Design TwitterVideo

Solution45.6%Medium

Design, Hash Table +2· 14 companies

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

78. SubsetsVideo

Solution82.7%Medium

Array, Backtracking +1· 21 companies

39. Combination SumVideo

Solution76.9%Medium

Array, Backtracking· 26 companies

46. PermutationsVideo

Solution82.3%Medium

Array, Backtracking· 25 companies

90. Subsets IIVideo

Solution61.7%Medium

Array, Backtracking +1· 9 companies

40. Combination Sum IIVideo

Solution60.3%Medium

Array, Backtracking· 15 companies

79. Word SearchVideo

Solution48.2%Medium

Array, Backtracking +2· 36 companies

131. Palindrome PartitioningVideo

Solution74.4%Medium

Backtracking, Dynamic Programming +1· 10 companies

17. Letter Combinations of a Phone NumberVideo

Solution66.9%Medium

Backtracking, Hash Table +1· 34 companies

51. N-QueensVideo

Solution76.3%Hard

Array, Backtracking· 16 companies

200. Number of IslandsVideo

Solution65.2%Medium

Array, Breadth-First Search +3· 86 companies

133. Clone GraphVideo

Solution66.1%Medium

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

695. Max Area of IslandVideo

Solution73.9%Medium

Array, Breadth-First Search +3· 20 companies

417. Pacific Atlantic Water FlowVideo

Solution61.3%Medium

Array, Breadth-First Search +2· 11 companies

130. Surrounded RegionsVideo

Solution46.1%Medium

Array, Breadth-First Search +3· 12 companies

994. Rotting OrangesVideo

Solution59.5%Medium

Array, Breadth-First Search +1· 52 companies

286. Walls and GatesVideoPremium

Solution63.9%Medium

Array, Breadth-First Search +1· 11 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

684. Redundant ConnectionVideo

Solution68.0%Medium

Breadth-First Search, Depth-First Search +2· 8 companies

323. Number of Connected Components in an Undirected GraphVideoPremium

Solution64.9%Medium

Breadth-First Search, Depth-First Search +2· 7 companies

261. Graph Valid TreeVideoPremium

Solution49.9%Medium

Breadth-First Search, Depth-First Search +2· 9 companies

127. Word LadderVideo

Solution46.3%Hard

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

332. Reconstruct ItineraryVideo

Solution45.0%Hard

Depth-First Search, Eulerian Circuit +1· 23 companies

1584. Min Cost to Connect All PointsVideo

Solution71.7%Medium

Array, Graph +2· 10 companies

743. Network Delay TimeVideo

Solution61.7%Medium

Breadth-First Search, Depth-First Search +3· 9 companies

778. Swim in Rising WaterVideo

Solution68.3%Hard

Array, Binary Search +5· 8 companies

269. Alien DictionaryVideoPremium

Solution37.1%Hard

Array, Breadth-First Search +4· 18 companies

787. Cheapest Flights Within K StopsVideo

Solution42.7%Medium

Breadth-First Search, Depth-First Search +4· 18 companies

70. Climbing StairsVideo

Solution54.0%Easy

Dynamic Programming, Math +1· 37 companies

746. Min Cost Climbing StairsVideo

Solution68.7%Easy

Array, Dynamic Programming· 7 companies

198. House RobberVideo

Solution53.6%Medium

Array, Dynamic Programming· 40 companies

213. House Robber IIVideo

Solution45.3%Medium

Array, Dynamic Programming· 19 companies

5. Longest Palindromic SubstringVideo

Solution38.7%Medium

Dynamic Programming, String +1· 81 companies

647. Palindromic SubstringsVideo

Solution73.2%Medium

Dynamic Programming, String +1· 25 companies

91. Decode WaysVideo

Solution38.3%Medium

Dynamic Programming, String· 22 companies

322. Coin ChangeVideo

Solution49.3%Medium

Array, Breadth-First Search +1· 40 companies

152. Maximum Product SubarrayVideo

Solution37.3%Medium

Array, Dynamic Programming· 23 companies

139. Word BreakVideo

Solution49.8%Medium

Array, Dynamic Programming +4· 32 companies

300. Longest Increasing SubsequenceVideo

Solution59.8%Medium

Array, Binary Search +1· 30 companies

416. Partition Equal Subset SumVideo

Solution49.9%Medium

Array, Dynamic Programming· 16 companies

62. Unique PathsVideo

Solution67.3%Medium

Combinatorics, Dynamic Programming +1· 21 companies

1143. Longest Common SubsequenceVideo

Solution59.6%Medium

Dynamic Programming, String· 19 companies

309. Best Time to Buy and Sell Stock with CooldownVideo

Solution62.4%Medium

Array, Dynamic Programming· 8 companies

518. Coin Change IIVideo

Solution59.1%Medium

Array, Dynamic Programming· 11 companies

494. Target SumVideo

Solution52.6%Medium

Array, Backtracking +1· 10 companies

97. Interleaving StringVideo

Solution45.0%Medium

Dynamic Programming, String· 10 companies

329. Longest Increasing Path in a MatrixVideo

Solution57.0%Hard

Array, Breadth-First Search +6· 16 companies

115. Distinct SubsequencesVideo

Solution54.1%Hard

Dynamic Programming, String· 13 companies

72. Edit DistanceVideo

Solution61.5%Medium

Dynamic Programming, String· 24 companies

312. Burst BalloonsVideo

Solution64.3%Hard

Array, Dynamic Programming· 15 companies

10. Regular Expression MatchingVideo

Solution31.8%Hard

Dynamic Programming, Recursion +1· 25 companies

53. Maximum SubarrayVideo

Solution53.7%Medium

Array, Divide and Conquer +1· 64 companies

55. Jump GameVideo

Solution41.2%Medium

Array, Dynamic Programming +1· 33 companies

45. Jump Game IIVideo

Solution43.2%Medium

Array, Dynamic Programming +1· 26 companies

134. Gas StationVideo

Solution48.4%Medium

Array, Greedy· 29 companies

846. Hand of StraightsVideo

Solution58.5%Medium

Array, Greedy +2· 6 companies

1899. Merge Triplets to Form Target TripletVideo

Solution69.5%Medium

Array, Greedy· 1 company

763. Partition LabelsVideo

Solution81.8%Medium

Greedy, Hash Table +2· 9 companies

678. Valid Parenthesis StringVideo

Solution42.8%Medium

Dynamic Programming, Greedy +2· 15 companies

57. Insert IntervalVideo

Solution46.1%Medium

Array· 16 companies

56. Merge IntervalsVideo

Solution52.6%Medium

Array, Sorting· 112 companies

435. Non-overlapping IntervalsVideo

Solution57.5%Medium

Array, Dynamic Programming +2· 18 companies

252. Meeting RoomsVideoPremium

Solution59.4%Easy

Array, Sorting· 10 companies

253. Meeting Rooms IIVideoPremium

Solution52.6%Medium

Array, Greedy +4· 42 companies

1851. Minimum Interval to Include Each QueryVideo

Solution55.4%Hard

Array, Binary Search +3· 3 companies

48. Rotate ImageVideo

Solution80.7%Medium

Array, Math +1· 36 companies

54. Spiral MatrixVideo

Solution58.2%Medium

Array, Matrix +1· 49 companies

73. Set Matrix ZeroesVideo

Solution63.8%Medium

Array, Hash Table +1· 22 companies

202. Happy NumberVideo

Solution60.0%Easy

Hash Table, Math +1· 27 companies

66. Plus OneVideo

Solution50.3%Easy

Array, Math· 13 companies

50. Pow(x, n)Video

Solution39.0%Medium

Math, Recursion· 22 companies

43. Multiply StringsVideo

Solution44.4%Medium

Math, Simulation +1· 17 companies

2013. Detect SquaresVideo

Solution53.0%Medium

Array, Counting +2· 4 companies

136. Single NumberVideo

Solution78.1%Easy

Array, Bit Manipulation· 15 companies

191. Number of 1 BitsVideo

Solution77.7%Easy

Bit Manipulation, Divide and Conquer· 11 companies

338. Counting BitsVideo

Solution80.5%Easy

Bit Manipulation, Dynamic Programming· 9 companies

190. Reverse BitsVideo

Solution69.2%Easy

Bit Manipulation, Divide and Conquer· 9 companies

268. Missing NumberVideo

Solution72.4%Easy

Array, Binary Search +4· 19 companies

371. Sum of Two IntegersVideo

Solution55.9%Medium

Bit Manipulation, Math· 8 companies

7. Reverse IntegerVideo

Solution32.2%Medium

Math· 22 companies

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