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Neetcode Blind 75Official

The Blind 75 is a well-known collection of algorithmic practice problems widely used for coding interview preparation.

By FleetCode75 problems19 Easy49 Medium7 Hard16 followersUpdated 20 Apr 2025

Start: Contains Duplicate

75problems

19Easy

49Medium

7Hard

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

271. Encode and Decode StringsVideoPremium

Solution51.9%Medium

Array, Design +1· 11 companies

238. Product of Array Except SelfVideo

Solution69.3%Medium

Array, Prefix Sum· 40 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

15. 3SumVideo

Solution40.1%Medium

Array, Sorting +1· 57 companies

11. Container With Most WaterVideo

Solution60.9%Medium

Array, Greedy +1· 57 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

76. Minimum Window SubstringVideo

Solution48.3%Hard

Hash Table, Sliding Window +1· 35 companies

20. Valid ParenthesesVideo

Solution45.2%Easy

Stack, String· 113 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

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

141. Linked List CycleVideo

Solution55.2%Easy

Hash Table, Linked List +1· 24 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

23. Merge k Sorted ListsVideo

Solution60.3%Hard

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

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

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

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

39. Combination SumVideo

Solution76.9%Medium

Array, Backtracking· 26 companies

79. Word SearchVideo

Solution48.2%Medium

Array, Backtracking +2· 36 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

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

417. Pacific Atlantic Water FlowVideo

Solution61.3%Medium

Array, Breadth-First Search +2· 11 companies

207. Course ScheduleVideo

Solution52.2%Medium

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

261. Graph Valid TreeVideoPremium

Solution49.9%Medium

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

323. Number of Connected Components in an Undirected GraphVideoPremium

Solution64.9%Medium

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

269. Alien DictionaryVideoPremium

Solution37.1%Hard

Array, Breadth-First Search +4· 18 companies

70. Climbing StairsVideo

Solution54.0%Easy

Dynamic Programming, Math +1· 37 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

62. Unique PathsVideo

Solution67.3%Medium

Combinatorics, Dynamic Programming +1· 21 companies

1143. Longest Common SubsequenceVideo

Solution59.6%Medium

Dynamic Programming, String· 19 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

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

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

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

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