neetcodeblind75.md

Blind 75 — The Original Hit List

75 problems, 18 patterns, zero fluff. This list was posted anonymously on the Blind forum and spread everywhere because it works. If you only have a few weeks to prep, start here — every problem earns its spot.

1. Arrays & Hashing (8 problems)

#	Difficulty	Problem	LeetCode	Solution
217	Easy	Contains Duplicate	Link	Solution
242	Easy	Valid Anagram	Link	Solution
1	Easy	Two Sum	Link	Solution
49	Medium	Group Anagrams	Link	Solution
347	Medium	Top K Frequent Elements	Link	Solution
271	Medium	Encode and Decode Strings	Link	Solution
238	Medium	Product of Array Except Self	Link	Solution
128	Medium	Longest Consecutive Sequence	Link	Solution

2. Two Pointers (3 problems)

#	Difficulty	Problem	LeetCode	Solution
125	Easy	Valid Palindrome	Link	Solution
15	Medium	3Sum	Link	Solution
11	Medium	Container With Most Water	Link	Solution

3. Sliding Window (4 problems)

#	Difficulty	Problem	LeetCode	Solution
121	Easy	Best Time to Buy and Sell Stock	Link	Solution
3	Medium	Longest Substring Without Repeating Characters	Link	Solution
424	Medium	Longest Repeating Character Replacement	Link	Solution
76	Hard	Minimum Window Substring	Link	Solution

4. Stack (1 problems)

#	Difficulty	Problem	LeetCode	Solution
20	Easy	Valid Parentheses	Link	Solution

5. Binary Search (2 problems)

#	Difficulty	Problem	LeetCode	Solution
153	Medium	Find Minimum in Rotated Sorted Array	Link	Solution
33	Medium	Search in Rotated Sorted Array	Link	Solution

6. Linked List (6 problems)

#	Difficulty	Problem	LeetCode	Solution
206	Easy	Reverse Linked List	Link	Solution
21	Easy	Merge Two Sorted Lists	Link	Solution
141	Easy	Linked List Cycle	Link	Solution
143	Medium	Reorder List	Link	Solution
19	Medium	Remove Nth Node From End of List	Link	Solution
23	Hard	Merge K Sorted Lists	Link	Solution

7. Trees (11 problems)

#	Difficulty	Problem	LeetCode	Solution
226	Easy	Invert Binary Tree	Link	Solution
104	Easy	Maximum Depth of Binary Tree	Link	Solution
100	Easy	Same Tree	Link	Solution
572	Easy	Subtree of Another Tree	Link	Solution
235	Medium	Lowest Common Ancestor of a Binary Search Tree	Link	Solution
102	Medium	Binary Tree Level Order Traversal	Link	Solution
98	Medium	Validate Binary Search Tree	Link	Solution
230	Medium	Kth Smallest Element in a BST	Link	Solution
105	Medium	Construct Binary Tree from Preorder and Inorder Traversal	Link	Solution
124	Hard	Binary Tree Maximum Path Sum	Link	Solution
297	Hard	Serialize and Deserialize Binary Tree	Link	Solution

8. Tries (3 problems)

#	Difficulty	Problem	LeetCode	Solution
208	Medium	Implement Trie (Prefix Tree)	Link	Solution
211	Medium	Design Add and Search Words Data Structure	Link	Solution
212	Hard	Word Search II	Link	Solution

9. Heap / Priority Queue (1 problems)

#	Difficulty	Problem	LeetCode	Solution
295	Hard	Find Median from Data Stream	Link	Solution

10. Backtracking (2 problems)

#	Difficulty	Problem	LeetCode	Solution
39	Medium	Combination Sum	Link	Solution
79	Medium	Word Search	Link	Solution

11. Graphs (6 problems)

#	Difficulty	Problem	LeetCode	Solution
200	Medium	Number of Islands	Link	Solution
133	Medium	Clone Graph	Link	Solution
417	Medium	Pacific Atlantic Water Flow	Link	Solution
207	Medium	Course Schedule	Link	Solution
261	Medium	Graph Valid Tree	Link	-
323	Medium	Number of Connected Components in an Undirected Graph	Link	Solution

12. Advanced Graphs (1 problems)

#	Difficulty	Problem	LeetCode	Solution
269	Hard	Alien Dictionary	Link	-

13. 1-D Dynamic Programming (10 problems)

#	Difficulty	Problem	LeetCode	Solution
70	Easy	Climbing Stairs	Link	Solution
198	Medium	House Robber	Link	Solution
213	Medium	House Robber II	Link	Solution
5	Medium	Longest Palindromic Substring	Link	Solution
647	Medium	Palindromic Substrings	Link	Solution
91	Medium	Decode Ways	Link	Solution
322	Medium	Coin Change	Link	Solution
152	Medium	Maximum Product Subarray	Link	Solution
139	Medium	Word Break	Link	Solution
300	Medium	Longest Increasing Subsequence	Link	Solution

14. 2-D Dynamic Programming (2 problems)

#	Difficulty	Problem	LeetCode	Solution
62	Medium	Unique Paths	Link	Solution
1143	Medium	Longest Common Subsequence	Link	Solution

15. Greedy (2 problems)

#	Difficulty	Problem	LeetCode	Solution
53	Medium	Maximum Subarray	Link	Solution
55	Medium	Jump Game	Link	Solution

16. Intervals (5 problems)

#	Difficulty	Problem	LeetCode	Solution
57	Medium	Insert Interval	Link	Solution
56	Medium	Merge Intervals	Link	Solution
435	Medium	Non-overlapping Intervals	Link	Solution
252	Easy	Meeting Rooms	Link	-
253	Medium	Meeting Rooms II	Link	-

17. Math & Geometry (3 problems)

#	Difficulty	Problem	LeetCode	Solution
48	Medium	Rotate Image	Link	Solution
54	Medium	Spiral Matrix	Link	Solution
73	Medium	Set Matrix Zeroes	Link	Solution

18. Bit Manipulation (5 problems)

#	Difficulty	Problem	LeetCode	Solution
191	Easy	Number of 1 Bits	Link	Solution
338	Easy	Counting Bits	Link	Solution
190	Easy	Reverse Bits	Link	Solution
268	Easy	Missing Number	Link	Solution
371	Medium	Sum of Two Integers	Link	Solution

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Summary

Total: 75 problems

The Blind 75 covers 18 categories, each distilled to the single most representative problem. It's a strict subset of the NeetCode 150 — finish this first, then expand.