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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

73problems

21Easy

43Medium

9Hard

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

Showing 43 of 73 problems · Medium · Clear

TitleSolutionAcceptDifficultyTopics

238. Product of Array Except SelfVideo

Solution69.3%Medium

Array, Prefix Sum· 40 companies

53. Maximum SubarrayVideo

Solution53.7%Medium

Array, Divide and Conquer +1· 64 companies

57. Insert IntervalVideo

Solution46.1%Medium

Array· 16 companies

15. 3SumVideo

Solution40.1%Medium

Array, Sorting +1· 57 companies

39. Combination SumVideo

Solution76.9%Medium

Array, Backtracking· 26 companies

56. Merge IntervalsVideo

Solution52.6%Medium

Array, Sorting· 112 companies

75. Sort ColorsVideo

Solution69.9%Medium

Array, Sorting +1· 37 companies

11. Container With Most WaterVideo

Solution60.9%Medium

Array, Greedy +1· 57 companies

3. Longest Substring Without Repeating CharactersVideo

Solution39.9%Medium

Hash Table, Sliding Window +1· 104 companies

8. String to Integer (atoi)Video

Solution21.4%Medium

String· 21 companies

5. Longest Palindromic SubstringVideo

Solution38.7%Medium

Dynamic Programming, String +1· 81 companies

438. Find All Anagrams in a StringVideo

Solution54.7%Medium

Hash Table, Sliding Window +1· 15 companies

155. Min StackVideo

Solution58.5%Medium

Design, Stack· 37 companies

150. Evaluate Reverse Polish NotationVideo

Solution58.5%Medium

Array, Math +1· 18 companies

146. LRU CacheVideo

Solution48.2%Medium

Design, Doubly-Linked List +2· 120 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

236. Lowest Common Ancestor of a Binary TreeVideo

Solution70.1%Medium

Binary Tree, Depth-First Search +1· 22 companies

199. Binary Tree Right Side ViewVideo

Solution71.5%Medium

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

105. Construct Binary Tree from Preorder and Inorder TraversalVideo

Solution69.7%Medium

Array, Binary Tree +3· 9 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

133. Clone GraphVideo

Solution66.1%Medium

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

542. 01 MatrixVideo

Solution54.7%Medium

Array, Breadth-First Search +2· 14 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

994. Rotting OrangesVideo

Solution59.5%Medium

Array, Breadth-First Search +1· 52 companies

721. Accounts MergeVideo

Solution62.2%Medium

Array, Breadth-First Search +5· 17 companies

79. Word SearchVideo

Solution48.2%Medium

Array, Backtracking +2· 36 companies

310. Minimum Height TreesVideo

Solution42.4%Medium

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

322. Coin ChangeVideo

Solution49.3%Medium

Array, Breadth-First Search +1· 40 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

139. Word BreakVideo

Solution49.8%Medium

Array, Dynamic Programming +4· 32 companies

973. K Closest Points to OriginVideo

Solution69.4%Medium

Array, Divide and Conquer +5· 17 companies

621. Task SchedulerVideo

Solution64.0%Medium

Array, Counting +4· 24 companies

46. PermutationsVideo

Solution82.3%Medium

Array, Backtracking· 25 companies

17. Letter Combinations of a Phone NumberVideo

Solution66.9%Medium

Backtracking, Hash Table +1· 34 companies

78. SubsetsVideo

Solution82.7%Medium

Array, Backtracking +1· 21 companies

208. Implement Trie (Prefix Tree)Video

Solution69.9%Medium

Design, Hash Table +2· 21 companies

54. Spiral MatrixVideo

Solution58.2%Medium

Array, Matrix +1· 49 companies

235. Lowest Common Ancestor of a Binary Search TreeVideo

Solution71.4%Medium

Binary Search Tree, Binary Tree +2· 10 companies

230. Kth Smallest Element in a BSTVideo

Solution77.2%Medium

Binary Search Tree, Binary Tree +2· 12 companies

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