Blind 75

The original 75 LeetCode problems curated by a Blind user. Covers all major patterns needed for FAANG interviews.

Azhar Khan76 problems19 Easy50 Med6 Hard

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Title	Solution	Practice	Difficulty	Companies	Topics
211. Design Add and Search Words Data Structure	Solution	Solve	Medium	-	Depth-First Search Design+2
252. Meeting Rooms	Solution	Solve	Easy	-	Array Sorting
242. Valid Anagram	Solution	Solve	Easy	-	Hash Table Sorting+1
238. Product of Array Except Self	Solution	Solve	Medium	-	Array Prefix Sum
235. Lowest Common Ancestor of a Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
230. Kth Smallest Element in a BST	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
226. Invert Binary Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
217. Contains Duplicate	Solution	Solve	Easy	-	Array Hash Table+1
213. House Robber II	Solution	Solve	Medium	-	Array Dynamic Programming
212. Word Search II	Solution	Solve	Hard	-	Array Backtracking+3
253. Meeting Rooms II	Solution	Solve	Medium	-	Array Greedy+4
208. Implement Trie (Prefix Tree)	Solution	Solve	Medium	-	Design Hash Table+2
207. Course Schedule	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
206. Reverse Linked List	Solution	Solve	Easy	-	Linked List Recursion
200. Number of Islands	Solution	Solve	Medium	-	Array Breadth-First Search+3
198. House Robber	Solution	Solve	Medium	-	Array Dynamic Programming
191. Number of 1 Bits	Solution	Solve	Easy	-	Bit Manipulation Divide and Conquer
190. Reverse Bits	Solution	Solve	Easy	-	Bit Manipulation Divide and Conquer
153. Find Minimum in Rotated Sorted Array	Solution	Solve	Medium	-	Array Binary Search
338. Counting Bits	Solution	Solve	Easy	-	Bit Manipulation Dynamic Programming
1143. Longest Common Subsequence	Solution	Solve	Medium	-	Dynamic Programming String
647. Palindromic Substrings	Solution	Solve	Medium	-	Dynamic Programming String+1
572. Subtree of Another Tree	Solution	Solve	Easy	-	Binary Tree Depth-First Search+3
435. Non-overlapping Intervals	Solution	Solve	Medium	-	Array Dynamic Programming+2
424. Longest Repeating Character Replacement	Solution	Solve	Medium	-	Hash Table Sliding Window+1
417. Pacific Atlantic Water Flow	Solution	Solve	Medium	-	Array Breadth-First Search+2
377. Combination Sum IV	Solution	Solve	Medium	-	Array Dynamic Programming
371. Sum of Two Integers	Solution	Solve	Medium	-	Bit Manipulation Math
347. Top K Frequent Elements	Solution	Solve	Medium	-	Array Bucket Sort+6
152. Maximum Product Subarray	Solution	Solve	Medium	-	Array Dynamic Programming
323. Number of Connected Components in an Undirected Graph	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
322. Coin Change	Solution	Solve	Medium	-	Array Breadth-First Search+1
300. Longest Increasing Subsequence	Solution	Solve	Medium	-	Array Binary Search+1
297. Serialize and Deserialize Binary Tree	Solution	Solve	Hard	-	Binary Tree Breadth-First Search+4
295. Find Median from Data Stream	Solution	Solve	Hard	-	Data Stream Design+3
271. Encode and Decode Strings	Solution	Solve	Medium	-	Array Design+1
268. Missing Number	Solution	Solve	Easy	-	Array Binary Search+4
261. Graph Valid Tree	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
33. Search in Rotated Sorted Array	Solution	Solve	Medium	-	Array Binary Search
62. Unique Paths	Solution	Solve	Medium	-	Combinatorics Dynamic Programming+1
57. Insert Interval	Solution	Solve	Medium	-	Array
56. Merge Intervals	Solution	Solve	Medium	-	Array Sorting
55. Jump Game	Solution	Solve	Medium	-	Array Dynamic Programming+1
54. Spiral Matrix	Solution	Solve	Medium	-	Array Matrix+1
53. Maximum Subarray	Solution	Solve	Medium	-	Array Divide and Conquer+1
49. Group Anagrams	Solution	Solve	Medium	-	Array Hash Table+2
48. Rotate Image	Solution	Solve	Medium	-	Array Math+1
39. Combination Sum	Solution	Solve	Medium	-	Array Backtracking
70. Climbing Stairs	Solution	Solve	Easy	-	Dynamic Programming Math+1
23. Merge k Sorted Lists	Solution	Solve	Hard	-	Divide and Conquer Heap (Priority Queue)+2
21. Merge Two Sorted Lists	Solution	Solve	Easy	-	Linked List Recursion
20. Valid Parentheses	Solution	Solve	Easy	-	Stack String
19. Remove Nth Node From End of List	Solution	Solve	Medium	-	Linked List Two Pointers
15. 3Sum	Solution	Solve	Medium	-	Array Sorting+1
11. Container With Most Water	Solution	Solve	Medium	-	Array Greedy+1
5. Longest Palindromic Substring	Solution	Solve	Medium	-	Dynamic Programming String+1
3. Longest Substring Without Repeating Characters	Solution	Solve	Medium	-	Hash Table Sliding Window+1
105. Construct Binary Tree from Preorder and Inorder Traversal	Solution	Solve	Medium	-	Array Binary Tree+3
143. Reorder List	Solution	Solve	Medium	-	Linked List Recursion+2
141. Linked List Cycle	Solution	Solve	Easy	-	Hash Table Linked List+1
139. Word Break	Solution	Solve	Medium	-	Array Dynamic Programming+4
133. Clone Graph	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
128. Longest Consecutive Sequence	Solution	Solve	Medium	-	Array Hash Table+1
125. Valid Palindrome	Solution	Solve	Easy	-	String Two Pointers
124. Binary Tree Maximum Path Sum	Solution	Solve	Hard	-	Binary Tree Depth-First Search+2
121. Best Time to Buy and Sell Stock	Solution	Solve	Easy	-	Array Dynamic Programming
1. Two Sum	Solution	Solve	Easy	-	Array Hash Table
104. Maximum Depth of Binary Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
102. Binary Tree Level Order Traversal	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+1
100. Same Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
98. Validate Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
91. Decode Ways	Solution	Solve	Medium	-	Dynamic Programming String
79. Word Search	Solution	Solve	Medium	-	Array Backtracking+2
76. Minimum Window Substring	Solution	Solve	Hard	-	Hash Table Sliding Window+1
73. Set Matrix Zeroes	Solution	Solve	Medium	-	Array Hash Table+1