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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

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Showing 28 of 150 problems · Easy · Clear

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
125. Valid PalindromeVideo
Solution54.2%Easy
String, Two Pointers· 39 companies
121. Best Time to Buy and Sell StockVideo
Solution57.1%Easy
Array, Dynamic Programming· 92 companies
20. Valid ParenthesesVideo
Solution45.2%Easy
Stack, String· 113 companies
704. Binary SearchVideo
Solution61.2%Easy
Array, Binary Search· 11 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
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
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
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
252. Meeting RoomsVideoPremium
Solution59.4%Easy
Array, Sorting· 10 companies
202. Happy NumberVideo
Solution60.0%Easy
Hash Table, Math +1· 27 companies
66. Plus OneVideo
Solution50.3%Easy
Array, Math· 13 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

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