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Grind 75Official

Updated version of Blind 75 by the same author (Yangshun Tay). A better, more balanced set of 75 problems across all key topics.

By FleetCode73 problems21 Easy43 Medium9 HardUpdated 23 Mar 2026
Start: Two Sum
73problems
21Easy
43Medium
9Hard

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Showing 21 of 73 problems · Easy · Clear

TitleSolutionAcceptDifficultyTopics
1. Two SumVideo
Solution57.8%Easy
Array, Hash Table· 127 companies
121. Best Time to Buy and Sell StockVideo
Solution57.1%Easy
Array, Dynamic Programming· 92 companies
217. Contains DuplicateVideo
Solution64.8%Easy
Array, Hash Table +1· 20 companies
125. Valid PalindromeVideo
Solution54.2%Easy
String, Two Pointers· 39 companies
242. Valid AnagramVideo
Solution68.5%Easy
Hash Table, Sorting +1· 40 companies
409. Longest PalindromeVideo
Solution55.9%Easy
Greedy, Hash Table +1· 8 companies
20. Valid ParenthesesVideo
Solution45.2%Easy
Stack, String· 113 companies
232. Implement Queue using StacksVideo
Solution70.2%Easy
Design, Queue +1· 12 companies
21. Merge Two Sorted ListsVideo
Solution68.7%Easy
Linked List, Recursion· 36 companies
206. Reverse Linked ListVideo
Solution81.0%Easy
Linked List, Recursion· 34 companies
141. Linked List CycleVideo
Solution55.2%Easy
Hash Table, Linked List +1· 24 companies
876. Middle of the Linked ListVideo
Solution82.3%Easy
Linked List, Two Pointers· 13 companies
226. Invert Binary TreeVideo
Solution80.5%Easy
Binary Tree, Breadth-First Search +2· 9 companies
110. Balanced Binary TreeVideo
Solution59.2%Easy
Binary Tree, Depth-First Search +1· 9 companies
543. Diameter of Binary TreeVideo
Solution66.4%Easy
Binary Tree, Depth-First Search +1· 20 companies
104. Maximum Depth of Binary TreeVideo
Solution78.6%Easy
Binary Tree, Breadth-First Search +2· 17 companies
704. Binary SearchVideo
Solution61.2%Easy
Array, Binary Search· 11 companies
278. First Bad VersionVideo
Solution47.5%Easy
Binary Search, Interactive· 7 companies
733. Flood FillVideo
Solution68.6%Easy
Array, Breadth-First Search +2· 12 companies
70. Climbing StairsVideo
Solution54.0%Easy
Dynamic Programming, Math +1· 37 companies
383. Ransom NoteVideo
Solution66.3%Easy
Counting, Hash Table +1· 14 companies

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