Beyond 75

The Next Level

The next 75 most important coding interview problems after the Essential 75. Curated from NeetCode 150, Grind 169, and real FAANG interview frequency data. These build on patterns you already know and introduce advanced techniques interviewers love to test.

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1.Valid SudokuArraysMedium
2.Subarray Sum Equals KArraysMedium
3.Majority ElementPremium AccessEasy
4.Sort ColorsPremium AccessMedium
5.Rotate ArrayPremium AccessMedium
6.Contiguous ArrayPremium AccessMedium
7.Insert Delete GetRandom O(1)Premium AccessMedium
8.Find All Anagrams in a StringPremium AccessMedium
9.Decode StringPremium AccessMedium
10.Happy NumberPremium AccessEasy
11.Single NumberPremium AccessEasy
12.Plus OnePremium AccessEasy
13.Longest Common PrefixPremium AccessEasy
14.Trapping Rain WaterPremium AccessHard
15.Two Sum II - Input Array Is SortedPremium AccessMedium
16.Permutation in StringPremium AccessMedium
17.Sliding Window MaximumPremium AccessHard
18.Search a 2D MatrixPremium AccessMedium
19.Koko Eating BananasPremium AccessMedium
20.Time Based Key-Value StorePremium AccessMedium
21.Median of Two Sorted ArraysPremium AccessHard
22.Find the Duplicate NumberPremium AccessMedium
23.Single Element in a Sorted ArrayPremium AccessMedium
24.Pow(x, n)Premium AccessMedium
25.Multiply StringsPremium AccessMedium
26.Min StackPremium AccessMedium
27.Evaluate Reverse Polish NotationPremium AccessMedium
28.Generate ParenthesesPremium AccessMedium
29.Daily TemperaturesPremium AccessMedium
30.Largest Rectangle in HistogramPremium AccessHard
31.Implement Queue using StacksPremium AccessEasy
32.Copy List with Random PointerPremium AccessMedium
33.Add Two NumbersPremium AccessMedium
34.Reverse Nodes in k-GroupPremium AccessHard
35.LRU CachePremium AccessMedium
36.Design TwitterPremium AccessMedium
37.Basic Calculator IIPremium AccessMedium
38.Diameter of Binary TreePremium AccessEasy
39.Balanced Binary TreePremium AccessEasy
40.Binary Tree Right Side ViewPremium AccessMedium
41.Count Good Nodes in Binary TreePremium AccessMedium
42.Lowest Common Ancestor of a Binary TreePremium AccessMedium
43.Convert Sorted Array to Binary Search TreePremium AccessEasy
44.Path Sum IIIPremium AccessMedium
45.Kth Largest Element in a StreamPremium AccessEasy
46.Kth Largest Element in an ArrayPremium AccessMedium
47.K Closest Points to OriginPremium AccessMedium
48.Task SchedulerPremium AccessMedium
49.Last Stone WeightPremium AccessEasy
50.Max Area of IslandPremium AccessMedium
51.Rotting OrangesPremium AccessMedium
52.Surrounded RegionsPremium AccessMedium
53.Course Schedule IIPremium AccessMedium
54.Redundant ConnectionPremium AccessMedium
55.Word LadderPremium AccessHard
56.Network Delay TimePremium AccessMedium
57.Cheapest Flights Within K StopsPremium AccessMedium
58.Min Cost to Connect All PointsPremium AccessMedium
59.Reconstruct ItineraryPremium AccessHard
60.01 MatrixPremium AccessMedium
61.Min Cost Climbing StairsPremium AccessEasy
62.Partition Equal Subset SumPremium AccessMedium
63.Edit DistancePremium AccessMedium
64.Best Time to Buy and Sell Stock with CooldownPremium AccessMedium
65.Coin Change IIPremium AccessMedium
66.Target SumPremium AccessMedium
67.Longest Increasing Path in a MatrixPremium AccessHard
68.Burst BalloonsPremium AccessHard
69.Jump Game IIPremium AccessMedium
70.Gas StationPremium AccessMedium
71.Partition LabelsPremium AccessMedium
72.SubsetsPremium AccessMedium
73.PermutationsPremium AccessMedium
74.N-QueensPremium AccessHard
75.Reverse IntegerPremium AccessMedium