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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

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

Showing 39 of 150 problems · Easy · Clear

TitleSolutionAcceptDifficultyTopics

88. Merge Sorted ArrayVideo

Solution55.7%Easy

Array, Sorting +1· 37 companies

27. Remove ElementVideo

Solution62.2%Easy

Array, Two Pointers· 10 companies

26. Remove Duplicates from Sorted ArrayVideo

Solution63.7%Easy

Array, Two Pointers· 26 companies

169. Majority ElementVideo

Solution66.2%Easy

Array, Counting +3· 22 companies

121. Best Time to Buy and Sell StockVideo

Solution57.1%Easy

Array, Dynamic Programming· 92 companies

13. Roman to IntegerVideo

Solution67.0%Easy

Hash Table, Math +1· 36 companies

58. Length of Last WordVideo

Solution59.7%Easy

String· 7 companies

14. Longest Common PrefixVideo

Solution48.6%Easy

String, Trie· 60 companies

28. Find the Index of the First Occurrence in a StringVideo

Solution47.0%Easy

String, String Matching +1· 16 companies

125. Valid PalindromeVideo

Solution54.2%Easy

String, Two Pointers· 39 companies

392. Is SubsequenceVideo

Solution49.5%Easy

Dynamic Programming, String +1· 16 companies

383. Ransom NoteVideo

Solution66.3%Easy

Counting, Hash Table +1· 14 companies

205. Isomorphic StringsVideo

Solution48.8%Easy

Hash Table, String· 15 companies

290. Word PatternVideo

Solution44.5%Easy

Hash Table, String· 9 companies

242. Valid AnagramVideo

Solution68.5%Easy

Hash Table, Sorting +1· 40 companies

1. Two SumVideo

Solution57.8%Easy

Array, Hash Table· 127 companies

202. Happy NumberVideo

Solution60.0%Easy

Hash Table, Math +1· 27 companies

219. Contains Duplicate IIVideo

Solution51.6%Easy

Array, Hash Table +1· 15 companies

228. Summary RangesVideo

Solution54.6%Easy

Array· 9 companies

20. Valid ParenthesesVideo

Solution45.2%Easy

Stack, String· 113 companies

141. Linked List CycleVideo

Solution55.2%Easy

Hash Table, Linked List +1· 24 companies

21. Merge Two Sorted ListsVideo

Solution68.7%Easy

Linked List, Recursion· 36 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

226. Invert Binary TreeVideo

Solution80.5%Easy

Binary Tree, Breadth-First Search +2· 9 companies

101. Symmetric TreeVideo

Solution62.1%Easy

Binary Tree, Breadth-First Search +2· 11 companies

112. Path SumVideo

Solution55.8%Easy

Binary Tree, Breadth-First Search +2· 9 companies

637. Average of Levels in Binary TreeVideo

Solution74.8%Easy

Binary Tree, Breadth-First Search +2· 4 companies

530. Minimum Absolute Difference in BSTVideo

Solution59.3%Easy

Binary Search Tree, Binary Tree +3· 3 companies

108. Convert Sorted Array to Binary Search TreeVideo

Solution75.9%Easy

Array, Binary Search Tree +3· 9 companies

35. Search Insert PositionVideo

Solution52.1%Easy

Array, Binary Search· 12 companies

67. Add BinaryVideo

Solution58.4%Easy

Bit Manipulation, Math +2· 17 companies

190. Reverse BitsVideo

Solution69.2%Easy

Bit Manipulation, Divide and Conquer· 9 companies

191. Number of 1 BitsVideo

Solution77.7%Easy

Bit Manipulation, Divide and Conquer· 11 companies

136. Single NumberVideo

Solution78.1%Easy

Array, Bit Manipulation· 15 companies

70. Climbing StairsVideo

Solution54.0%Easy

Dynamic Programming, Math +1· 37 companies

9. Palindrome NumberVideo

Solution61.0%Easy

Math· 31 companies

66. Plus OneVideo

Solution50.3%Easy

Array, Math· 13 companies

69. Sqrt(x)Video

Solution42.2%Easy

Binary Search, Math· 17 companies

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