Skip to content

For employers Sign in

Make and follow sheets.Sign in

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 18 of 150 problems · Hard · Clear

TitleSolutionAcceptDifficultyTopics

135. CandyVideo

Solution49.3%Hard

Array, Greedy· 24 companies

42. Trapping Rain WaterVideo

Solution68.2%Hard

Array, Dynamic Programming +3· 73 companies

68. Text JustificationVideo

Solution52.4%Hard

Array, Simulation +1· 44 companies

30. Substring with Concatenation of All WordsVideo

Solution35.4%Hard

Hash Table, Sliding Window +1· 10 companies

76. Minimum Window SubstringVideo

Solution48.3%Hard

Hash Table, Sliding Window +1· 35 companies

224. Basic CalculatorVideo

Solution47.3%Hard

Math, Recursion +2· 25 companies

25. Reverse Nodes in k-GroupVideo

Solution67.4%Hard

Linked List, Recursion· 27 companies

124. Binary Tree Maximum Path SumVideo

Solution42.7%Hard

Binary Tree, Depth-First Search +2· 25 companies

127. Word LadderVideo

Solution46.3%Hard

Breadth-First Search, Hash Table +1· 41 companies

212. Word Search IIVideo

Solution38.8%Hard

Array, Backtracking +3· 21 companies

52. N-Queens IIVideo

Solution79.5%Hard

Backtracking· 10 companies

23. Merge k Sorted ListsVideo

Solution60.3%Hard

Divide and Conquer, Heap (Priority Queue) +2· 50 companies

4. Median of Two Sorted ArraysVideo

Solution47.9%Hard

Array, Binary Search +1· 45 companies

502. IPOVideo

Solution53.6%Hard

Array, Greedy +2· 9 companies

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

123. Best Time to Buy and Sell Stock IIIVideo

Solution54.5%Hard

Array, Dynamic Programming· 13 companies

188. Best Time to Buy and Sell Stock IVVideo

Solution51.5%Hard

Array, Dynamic Programming· 11 companies

149. Max Points on a LineVideo

Solution31.6%Hard

Array, Geometry +2· 16 companies

Comments