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NeetCode 250Official

NeetCode 150 plus 100 more beginner-friendly problems. The most approachable list for people completely new to algorithms. Each topic has extra easy problems.

By FleetCode249 problems60 Easy154 Medium35 Hard25 followersUpdated 23 Mar 2026

Start: Concatenation of Array

249problems

60Easy

154Medium

35Hard

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

Showing 35 of 249 problems · Hard · Clear

TitleSolutionAcceptDifficultyTopics

41. First Missing PositiveVideo

Solution43.8%Hard

Array, Hash Table· 33 companies

42. Trapping Rain WaterVideo

Solution68.2%Hard

Array, Dynamic Programming +3· 73 companies

76. Minimum Window SubstringVideo

Solution48.3%Hard

Hash Table, Sliding Window +1· 35 companies

239. Sliding Window MaximumVideo

Solution49.1%Hard

Array, Heap (Priority Queue) +3· 48 companies

895. Maximum Frequency StackVideo

Solution67.1%Hard

Design, Hash Table +2· 12 companies

84. Largest Rectangle in HistogramVideo

Solution50.7%Hard

Array, Monotonic Stack +1· 30 companies

410. Split Array Largest SumVideo

Solution61.2%Hard

Array, Binary Search +3· 20 companies

4. Median of Two Sorted ArraysVideo

Solution47.9%Hard

Array, Binary Search +1· 45 companies

1095. Find in Mountain ArrayVideo

Solution41.9%Hard

Array, Binary Search +1· 6 companies

460. LFU CacheVideo

Solution50.6%Hard

Design, Doubly-Linked List +2· 32 companies

23. Merge k Sorted ListsVideo

Solution60.3%Hard

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

297. Serialize and Deserialize Binary TreeVideo

Solution61.1%Hard

Binary Tree, Breadth-First Search +4· 23 companies

295. Find Median from Data StreamVideo

Solution54.9%Hard

Data Stream, Design +3· 40 companies

502. IPOVideo

Solution53.6%Hard

Array, Greedy +2· 9 companies

51. N-QueensVideo

Solution76.3%Hard

Array, Backtracking· 16 companies

52. N-Queens IIVideo

Solution79.5%Hard

Backtracking· 10 companies

140. Word Break IIVideo

Solution56.4%Hard

Array, Backtracking +5· 16 companies

212. Word Search IIVideo

Solution38.8%Hard

Array, Backtracking +3· 21 companies

127. Word LadderVideo

Solution46.3%Hard

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

332. Reconstruct ItineraryVideo

Solution45.0%Hard

Depth-First Search, Eulerian Circuit +1· 23 companies

778. Swim in Rising WaterVideo

Solution68.3%Hard

Array, Binary Search +5· 8 companies

269. Alien DictionaryVideoPremium

Solution37.1%Hard

Array, Breadth-First Search +4· 18 companies

1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning TreeVideo

Solution66.4%Hard

Graph, Minimum Spanning Tree +3· 4 companies

2392. Build a Matrix With ConditionsVideo

Solution79.5%Hard

Array, Graph +2· 1 company

2709. Greatest Common Divisor TraversalVideo

Solution41.6%Hard

1406. Stone Game IIIVideo

Solution68.0%Hard

Array, Dynamic Programming +2· 2 companies

329. Longest Increasing Path in a MatrixVideo

Solution57.0%Hard

Array, Breadth-First Search +6· 16 companies

115. Distinct SubsequencesVideo

Solution54.1%Hard

Dynamic Programming, String· 13 companies

312. Burst BalloonsVideo

Solution64.3%Hard

Array, Dynamic Programming· 15 companies

10. Regular Expression MatchingVideo

Solution31.8%Hard

Dynamic Programming, Recursion +1· 25 companies

135. CandyVideo

Solution49.3%Hard

Array, Greedy· 24 companies

2402. Meeting Rooms IIIVideo

Solution51.6%Hard

Array, Hash Table +3· 12 companies

1851. Minimum Interval to Include Each QueryVideo

Solution55.4%Hard

Array, Binary Search +3· 3 companies

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