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Top Interview 150Official

LeetCode's curated list of 150 must-do problems for coding interviews. Covers all essential patterns with increasing difficulty.

By FleetCode150 problems39 Easy93 Medium18 HardUpdated 23 Mar 2026
Start: Merge Sorted Array
150problems
39Easy
93Medium
18Hard

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Showing 93 of 150 problems · Medium · Clear

TitleSolutionAcceptDifficultyTopics
80. Remove Duplicates from Sorted Array IIVideo
Solution65.0%Medium
Array, Two Pointers· 9 companies
189. Rotate ArrayVideo
Solution45.3%Medium
Array, Math +1· 27 companies
122. Best Time to Buy and Sell Stock IIVideo
Solution71.4%Medium
Array, Dynamic Programming +1· 28 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
274. H-IndexVideo
Solution41.8%Medium
Array, Counting Sort +1· 8 companies
380. Insert Delete GetRandom O(1)Video
Solution55.3%Medium
Array, Design +3· 38 companies
238. Product of Array Except SelfVideo
Solution69.3%Medium
Array, Prefix Sum· 40 companies
134. Gas StationVideo
Solution48.4%Medium
Array, Greedy· 29 companies
12. Integer to RomanVideo
Solution71.8%Medium
Hash Table, Math +1· 31 companies
151. Reverse Words in a StringVideo
Solution57.8%Medium
String, Two Pointers· 30 companies
6. Zigzag ConversionVideo
Solution54.9%Medium
String· 19 companies
167. Two Sum II - Input Array Is SortedVideo
Solution66.1%Medium
Array, Binary Search +1· 16 companies
11. Container With Most WaterVideo
Solution60.9%Medium
Array, Greedy +1· 57 companies
15. 3SumVideo
Solution40.1%Medium
Array, Sorting +1· 57 companies
209. Minimum Size Subarray SumVideo
Solution53.1%Medium
Array, Binary Search +2· 18 companies
3. Longest Substring Without Repeating CharactersVideo
Solution39.9%Medium
Hash Table, Sliding Window +1· 104 companies
36. Valid SudokuVideo
Solution64.9%Medium
Array, Hash Table +1· 26 companies
54. Spiral MatrixVideo
Solution58.2%Medium
Array, Matrix +1· 49 companies
48. Rotate ImageVideo
Solution80.7%Medium
Array, Math +1· 36 companies
73. Set Matrix ZeroesVideo
Solution63.8%Medium
Array, Hash Table +1· 22 companies
289. Game of LifeVideo
Solution73.0%Medium
Array, Matrix +1· 15 companies
49. Group AnagramsVideo
Solution73.0%Medium
Array, Hash Table +2· 87 companies
128. Longest Consecutive SequenceVideo
Solution47.0%Medium
Array, Hash Table +1· 40 companies
56. Merge IntervalsVideo
Solution52.6%Medium
Array, Sorting· 112 companies
57. Insert IntervalVideo
Solution46.1%Medium
Array· 16 companies
452. Minimum Number of Arrows to Burst BalloonsVideo
Solution61.9%Medium
Array, Greedy +1· 8 companies
71. Simplify PathVideo
Solution51.4%Medium
Stack, String· 24 companies
155. Min StackVideo
Solution58.5%Medium
Design, Stack· 37 companies
150. Evaluate Reverse Polish NotationVideo
Solution58.5%Medium
Array, Math +1· 18 companies
2. Add Two NumbersVideo
Solution49.3%Medium
Linked List, Math +1· 37 companies
138. Copy List with Random PointerVideo
Solution63.8%Medium
Hash Table, Linked List· 22 companies
92. Reverse Linked List IIVideo
Solution52.4%Medium
Linked List· 16 companies
19. Remove Nth Node From End of ListVideo
Solution52.4%Medium
Linked List, Two Pointers· 18 companies
82. Remove Duplicates from Sorted List IIVideo
Solution52.8%Medium
Linked List, Two Pointers· 11 companies
61. Rotate ListVideo
Solution43.1%Medium
Linked List, Two Pointers· 9 companies
86. Partition ListVideo
Solution62.0%Medium
Linked List, Two Pointers· 5 companies
146. LRU CacheVideo
Solution48.2%Medium
Design, Doubly-Linked List +2· 120 companies
105. Construct Binary Tree from Preorder and Inorder TraversalVideo
Solution69.7%Medium
Array, Binary Tree +3· 9 companies
106. Construct Binary Tree from Inorder and Postorder TraversalVideo
Solution69.4%Medium
Array, Binary Tree +3· 7 companies
117. Populating Next Right Pointers in Each Node IIVideo
Solution57.9%Medium
Binary Tree, Breadth-First Search +3· 7 companies
114. Flatten Binary Tree to Linked ListVideo
Solution71.6%Medium
Binary Tree, Depth-First Search +3· 8 companies
129. Sum Root to Leaf NumbersVideo
Solution70.3%Medium
Binary Tree, Depth-First Search +1· 7 companies
173. Binary Search Tree IteratorVideo
Solution76.9%Medium
Binary Search Tree, Binary Tree +4· 8 companies
222. Count Complete Tree NodesVideo
Solution72.6%Medium
Binary Search, Binary Tree +2· 7 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
102. Binary Tree Level Order TraversalVideo
Solution73.5%Medium
Binary Tree, Breadth-First Search +1· 16 companies
103. Binary Tree Zigzag Level Order TraversalVideo
Solution64.4%Medium
Binary Tree, Breadth-First Search +1· 19 companies
230. Kth Smallest Element in a BSTVideo
Solution77.2%Medium
Binary Search Tree, Binary Tree +2· 12 companies
98. Validate Binary Search TreeVideo
Solution36.1%Medium
Binary Search Tree, Binary Tree +2· 18 companies
200. Number of IslandsVideo
Solution65.2%Medium
Array, Breadth-First Search +3· 86 companies
130. Surrounded RegionsVideo
Solution46.1%Medium
Array, Breadth-First Search +3· 12 companies
133. Clone GraphVideo
Solution66.1%Medium
Breadth-First Search, Depth-First Search +2· 18 companies
399. Evaluate DivisionVideo
Solution64.7%Medium
Array, Breadth-First Search +5· 23 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
909. Snakes and LaddersVideo
Solution48.0%Medium
Array, Breadth-First Search +1· 12 companies
433. Minimum Genetic MutationVideo
Solution57.1%Medium
Breadth-First Search, Hash Table +1· 6 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
17. Letter Combinations of a Phone NumberVideo
Solution66.9%Medium
Backtracking, Hash Table +1· 34 companies
77. CombinationsVideo
Solution74.9%Medium
Backtracking· 8 companies
46. PermutationsVideo
Solution82.3%Medium
Array, Backtracking· 25 companies
39. Combination SumVideo
Solution76.9%Medium
Array, Backtracking· 26 companies
22. Generate ParenthesesVideo
Solution79.6%Medium
Backtracking, Dynamic Programming +1· 40 companies
79. Word SearchVideo
Solution48.2%Medium
Array, Backtracking +2· 36 companies
148. Sort ListVideo
Solution65.2%Medium
Divide and Conquer, Linked List +3· 9 companies
427. Construct Quad TreeVideo
Solution78.8%Medium
Array, Divide and Conquer +2· 8 companies
53. Maximum SubarrayVideo
Solution53.7%Medium
Array, Divide and Conquer +1· 64 companies
918. Maximum Sum Circular SubarrayVideo
Solution51.5%Medium
Array, Divide and Conquer +3· 12 companies
74. Search a 2D MatrixVideo
Solution54.4%Medium
Array, Binary Search +1· 19 companies
162. Find Peak ElementVideo
Solution46.8%Medium
Array, Binary Search· 30 companies
33. Search in Rotated Sorted ArrayVideo
Solution45.5%Medium
Array, Binary Search· 53 companies
34. Find First and Last Position of Element in Sorted ArrayVideo
Solution49.7%Medium
Array, Binary Search· 29 companies
153. Find Minimum in Rotated Sorted ArrayVideo
Solution55.3%Medium
Array, Binary Search· 18 companies
215. Kth Largest Element in an ArrayVideo
Solution69.4%Medium
Array, Divide and Conquer +3· 41 companies
373. Find K Pairs with Smallest SumsVideo
Solution42.3%Medium
Array, Heap (Priority Queue)· 10 companies
137. Single Number IIVideo
Solution68.0%Medium
Array, Bit Manipulation· 5 companies
201. Bitwise AND of Numbers RangeVideo
Solution49.4%Medium
Bit Manipulation· 5 companies
198. House RobberVideo
Solution53.6%Medium
Array, Dynamic Programming· 40 companies
139. Word BreakVideo
Solution49.8%Medium
Array, Dynamic Programming +4· 32 companies
322. Coin ChangeVideo
Solution49.3%Medium
Array, Breadth-First Search +1· 40 companies
300. Longest Increasing SubsequenceVideo
Solution59.8%Medium
Array, Binary Search +1· 30 companies
120. TriangleVideo
Solution59.9%Medium
Array, Dynamic Programming· 11 companies
64. Minimum Path SumVideo
Solution68.6%Medium
Array, Dynamic Programming +1· 17 companies
63. Unique Paths IIVideo
Solution44.9%Medium
Array, Dynamic Programming +1· 9 companies
5. Longest Palindromic SubstringVideo
Solution38.7%Medium
Dynamic Programming, String +1· 81 companies
97. Interleaving StringVideo
Solution45.0%Medium
Dynamic Programming, String· 10 companies
72. Edit DistanceVideo
Solution61.5%Medium
Dynamic Programming, String· 24 companies
221. Maximal SquareVideo
Solution50.7%Medium
Array, Dynamic Programming +1· 28 companies
172. Factorial Trailing ZeroesVideo
Solution47.5%Medium
Math· 5 companies
50. Pow(x, n)Video
Solution39.0%Medium
Math, Recursion· 22 companies

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