Strivers Blind 75

Blind 75 leetcode is a list of 75 most frequent asked leetcode questions which had helped many developers clear interviews of Google, Amazon, Microsoft, Facebook etc. Hence, it is a tried and tested list with 1000s of testimonials available on all public review platforms such as quora, teamblind etc.

Azhar Khan72 problems19 Easy48 Med5 Hard

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

#102

Binary Tree Level Order Traversal

Medium✓ Solution

Strivers Blind 75

Binary Tree Level Order Traversal

Serialize and Deserialize Binary Tree

Same Tree

Invert Binary Tree

Binary Tree Maximum Path Sum

Top K Frequent Elements

Maximum Depth of Binary Tree

Find Median from Data Stream

Lowest Common Ancestor of a Binary Search Tree

Implement Trie (Prefix Tree)

Validate Binary Search Tree

Kth Smallest Element in a BST

Construct Binary Tree from Inorder and Postorder Traversal

Subtree of Another Tree

Encode and Decode Strings

Palindromic Substrings

Longest Palindromic Substring

Valid Parentheses

Palindrome Number

Group Anagrams

Minimum Window Substring

Valid Anagram

Longest Substring Without Repeating Characters

Longest Repeating Character Replacement

Word Search

Rotate Image

Spiral Matrix

Set Matrix Zeroes

Reorder List

Remove Nth Node From End of List

Merge Two Sorted Lists

Linked List Cycle

Reverse Linked List

Meeting Rooms II

Merge Intervals

Meeting Rooms

Non-overlapping Intervals

Insert Interval

Alien Dictionary

Graph Valid Tree

Number of Connected Components in an Undirected Graph

Pacific Atlantic Water Flow

Number of Islands

Longest Consecutive Sequence

Unique Paths

Course Schedule

Clone Graph

Jump Game

Decode Ways

House Robber

House Robber II

Longest Increasing Subsequence

Longest Common Subsequence

Word Break

Combination Sum

Coin Change

Climbing Stairs

Reverse Bits

Missing Number

Number of 1 Bits

Counting Bits

Sum of Two Integers

Container With Most Water

Find Minimum in Rotated Sorted Array

3Sum

Search in Rotated Sorted Array

Product of Array Except Self

Maximum Subarray

Maximum Product Subarray

Best Time to Buy and Sell Stock

Two Sum

Contains Duplicate

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