The Blind 75 is a curated list of
75 essential LeetCode problems that cover key data structures and algorithms frequently asked in technical interviews at FAANG and other top tech companies. These problems help developers
master problem-solving skills while improving coding efficiency in real-world scenarios.
Why Solve Blind 75?
✅ Covers essential DSA topics:
Arrays, Linked Lists, Graphs, Trees, Dynamic Programming, Sliding Window, etc. ✅ Helps in FAANG and tech interviews by
focusing on high-impact problems. ✅ Improves coding proficiency with optimal and efficient solutions. ✅ Saves time by eliminating redundant
questions and focusing on core problem-solving
techniques.
How This Blog Helps You?
📌 Step-by-Step Solutions: Every
problem includes an intuitive breakdown of the solution. 📌 Optimized Code
Implementations: Solutions are provided in C++
(other languages can be added). 📌 Complexity Analysis: We analyze the time
& space complexity for every approach. 📌 Multiple Approaches: We discuss brute force, optimal, and alternative methods. 📌 Visual Explanations & Dry Run: We
illustrate solutions with examples and dry runs.
Blind 75 LeetCode Problems List with
Solutions
#
Problem
Category
Solution
Array
1
Two Sum
Array, HashMap
2
Best Time to Buy and Sell Stock
Array, Greedy
3
Contains Duplicate
Array, HashSet
4
Product of Array Except Self
Array, Prefix Sum
5
Maximum Subarray
Array, Kadane’s Algorithm
6
Maximum Product Subarray
Array, Dynamic Programming
7
Find Minimum in Rotated Sorted Array
Array, Binary Search
8
Search in Rotated Sorted Array
Array, Binary Search
9
3Sum
Array, Two Pointers
10
Container With Most Water
Array, Two Pointers
Binary Search
11
Binary Search
Binary Search
12
Search a 2D Matrix
Binary Search, Matrix
13
Find Kth Smallest Element in a Sorted Matrix
Binary Search, Heap
14
Median of Two Sorted Arrays
Binary Search, Divide and Conquer
Dynamic Programming
15
Climbing Stairs
Dynamic Programming, Recursion
16
Coin Change
Dynamic Programming, Greedy
17
Longest Increasing Subsequence
Dynamic Programming, Binary Search
18
Longest Common Subsequence
Dynamic Programming, Strings
19
Word Break
Dynamic Programming, Trie
20
Combination Sum
Backtracking, Dynamic Programming
21
House Robber
Dynamic Programming
22
House Robber II
Dynamic Programming
23
Decode Ways
Dynamic Programming, String
24
Unique Paths
Dynamic Programming, Math
25
Jump Game
Dynamic Programming, Greedy
Graph
26
Clone Graph
Graph, DFS, BFS
27
Course Schedule
Graph, Topological Sort
28
Pacific Atlantic Water Flow
Graph, DFS, BFS
29
Number of Islands
Graph, DFS, BFS
30
Longest Consecutive Sequence
Union-Find, HashSet
31
Alien Dictionary (Topological Sort)
Graph, BFS, DFS
32
Graph Valid Tree
Graph, DFS, BFS
33
Word Ladder
Graph, BFS
Intervals
34
Insert Interval
Array, Sorting
35
Merge Intervals
Array, Sorting
36
Non-overlapping Intervals
Array, Greedy
37
Meeting Rooms
Array, Sorting
38
Meeting Rooms II
Array, Min Heap
Linked List
39
Reverse a Linked List
Linked List, Recursion
40
Linked List Cycle
Linked List, Two Pointers
41
Merge Two Sorted Lists
Linked List, Recursion
42
Merge K Sorted Lists
Linked List, Heap
43
Remove Nth Node From End of List
Linked List, Two Pointers
44
Reorder List
Linked List, Two Pointers
Matrix
45
Set Matrix Zeroes
Matrix, Simulation
46
Spiral Matrix
Matrix
47
Rotate Image
Matrix, Simulation
48
Word Search
Matrix, Backtracking
Heap / Priority Queue
49
Kth Largest Element in an Array
Heap, QuickSelect
50
Find Median from Data Stream
Heap, Two Heaps
Backtracking
51
Subsets
Backtracking
52
Combination Sum
Backtracking, Dynamic Programming
53
Permutations
Backtracking
54
Letter Combinations of a Phone Number
Backtracking
55
N-Queens
Backtracking
Stack
56
Valid Parentheses
Stack, String
57
Generate Parentheses
Stack, Backtracking
58
Daily Temperatures
Stack, Monotonic Stack
59
Car Fleet
Stack, Sorting
60
Largest Rectangle in Histogram
Stack, Monotonic Stack
Trie
61
Implement Trie (Prefix Tree)
Trie
62
Design Add and Search Words Data Structure
Trie
63
Word Search II
Trie, Backtracking
Sliding Window
64
Longest Substring Without Repeating Characters
Sliding Window, HashMap
65
Longest Repeating Character Replacement
Sliding Window, Two Pointers
66
Minimum Window Substring
Sliding Window, HashMap
67
Sliding Window Maximum
Sliding Window, Heap
Two Pointers
68
Valid Palindrome
Two Pointers, String
69
Three Sum
Two Pointers, Sorting
70
Container with Most Water
Two Pointers, Greedy
71
Trapping Rain Water
Two Pointers, Stack
Bit Manipulation
72
Sum of Two Integers
Bit Manipulation, Math
73
Number of 1 Bits
Bit Manipulation
74
Counting Bits
Bit Manipulation, Dynamic Programming
75
Missing Number
Bit Manipulation, Math
How to Use This Guide?
🔹 Start with Easy Problems and
move towards Medium & Hard problems. 🔹 Understand problem constraints before
implementing solutions. 🔹 Write
code on your own first, then compare with optimal
solutions. 🔹 Use dry
runs & debugging to identify edge cases. 🔹 Revise regularly and implement problems in multiple languages.
Final Thoughts
Solving the Blind 75 problems
will significantly boost your coding skills and help you crack top tech interviews. Bookmark this page and start solving one problem a day to master DSA concepts!
🚀 Stay tuned for in-depth
solutions! Happy coding! 🎯💻
