Blind 75 LeetCode Solutions: A Complete Guide

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
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! 🎯💻

Sandip Mhaske

Senior Engineer • Author of 675 guides • Follow for System Design & .NET deep-dives

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