Neetcode Blind 75

The Blind 75 is a well-known collection of algorithmic practice problems widely used for coding interview preparation.

Azhar Khan

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