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Section 7 of 13100 Questions (1 Per Page)

Data Structures & Algorithms Master: Blind 75, NeetCode & Core Patterns (Multi-Language)

100 core problems from Blind 75 and NeetCode 150 with complete multi-language implementations in Python 3, JavaScript, TypeScript, Java, and C++ across Arrays, Trees, Graphs, and DP.

Start from Q1

Curriculum Roadmap & Learning Path

11 Stages
Tip: Click any stage card above to instantly filter the question bank to that topic.11 Connected Milestones

Part 1: Intro, Approach & Complexity Analysis (1 - 5)

5 Questions
1

What is the Core Framework for Approaching Data Structures & Algorithms (DSA) Live Coding Interviews?

2

Asymptotic Notation & Amortized Complexity.

3

The Master Theorem.

4

Space Complexity: Call Stack vs Heap.

5

Constraint-Based Pattern Recognition.

Part 2: Arrays, Strings & Hash Maps (6 - 18)

13 Questions
6

Two Sum.

7

Longest Consecutive Sequence.

8

Group Anagrams.

9

Product of Array Except Self.

10

Maximum Subarray (Kadane’s Algorithm).

11

Subarray Sum Equals K.

12

Best Time to Buy and Sell Stock (I & II).

13

Longest Common Prefix.

14

String Encode and Decode.

15

Rotate Array.

16

Next Permutation.

17

Merge Intervals.

18

Insert Interval.

Part 3: Two Pointers & Sliding Window (19 - 28)

10 Questions
19

Valid Palindrome.

20

Two Sum II (Input Array Is Sorted).

21

3Sum.

22

Container With Most Water.

23

Trapping Rain Water.

24

Longest Substring Without Repeating Characters.

25

Longest Repeating Character Replacement.

26

Minimum Window Substring.

27

Permutation in String.

28

Sliding Window Maximum.

Part 4: Stacks, Queues & Monotonic Stacks (29 - 36)

8 Questions
29

Valid Parentheses.

30

Min Stack.

31

Evaluate Reverse Polish Notation.

32

Daily Temperatures.

33

Largest Rectangle in Histogram.

34

Implement Queue using Stacks.

35

Generate Parentheses.

36

Car Fleet.

Part 5: Linked Lists & Fast-Slow Pointers (37 - 45)

9 Questions
37

Reverse a Linked List.

38

Merge Two Sorted Lists.

39

Linked List Cycle (Floyd’s Tortoise and Hare).

40

Remove Nth Node From End of List.

41

Reorder List.

42

Copy List with Random Pointer.

43

Add Two Numbers.

44

Find the Duplicate Number.

45

Merge K Sorted Lists.

Part 6: Binary Search & Search on Answer (46 - 52)

7 Questions
46

Binary Search on Sorted Boundaries.

47

Search a 2D Matrix.

48

Search in Rotated Sorted Array.

49

Find Minimum in Rotated Sorted Array.

50

Koko Eating Bananas.

51

Time Based Key-Value Store.

52

Median of Two Sorted Arrays.

Part 7: Binary Trees, BSTs & Traversals (53 - 64)

12 Questions
53

Invert / Flip Binary Tree.

54

Maximum Depth of Binary Tree.

55

Diameter of Binary Tree.

56

Balanced Binary Tree.

57

Same Tree & Symmetric Tree.

58

Subtree of Another Tree.

59

Lowest Common Ancestor (LCA) of BST & Binary Tree.

60

Binary Tree Level Order Traversal.

61

Binary Tree Right Side View.

62

Validate Binary Search Tree.

63

Kth Smallest Element in a BST.

64

Construct Tree from Preorder & Inorder Traversal.

Part 8: Heaps, Priority Queues & Tries (65 - 72)

8 Questions
65

Implement Trie (Prefix Tree).

66

Kth Largest Element in an Array.

67

Top K Frequent Elements.

68

Find Median from Data Stream.

69

Task Scheduler.

70

Design Twitter.

71

Reorganize String.

72

Minimum Cost to Connect Sticks.

Part 9: Backtracking & Combinatorial Search (73 - 79)

7 Questions
73

Subsets (Power Set).

74

Combination Sum.

75

Permutations.

76

Subsets II.

77

Word Search in Grid.

78

Palindrome Partitioning.

79

N-Queens.

Part 10: Graphs, BFS, DFS & Union-Find (80 - 90)

11 Questions
80

Number of Islands.

81

Clone Graph.

82

Rotting Oranges.

83

Pacific Atlantic Water Flow.

84

Course Schedule (I & II).

85

Connected Components & Disjoint Set Union (DSU).

86

Redundant Connection.

87

Word Ladder.

88

Network Delay Time (Dijkstra’s Algorithm).

89

Cheapest Flights Within K Stops.

90

Alien Dictionary.

Part 11: Dynamic Programming & Knapsack (91 - 100)

10 Questions
91

Climbing Stairs.

92

Min Cost Climbing Stairs.

93

House Robber (I & II).

94

Coin Change.

95

Longest Increasing Subsequence (LIS).

96

Word Break.

97

Unique Paths.

98

Longest Common Subsequence (LCS).

99

Best Time to Buy and Sell Stock with Cooldown.

100

0/1 Knapsack & Partition Equal Subset Sum.