Tech-Notes

Blind 75

Array

# Problem Status Level Link Answer
1 Two Sum ✅ Easy LeetCode Answer
2 Best Time to Buy and Sell Stock ✅ Easy LeetCode Answer
3 Contains Duplicate ✅ Easy LeetCode Answer
4 Product of Array Except Self ✅ Medium LeetCode Answer
5 Maximum Subarray ❌ Medium LeetCode -
6 Maximum Product Subarray ❌ Medium LeetCode -
7 Find Minimum in Rotated Sorted Array ✅ Medium LeetCode Answer
8 Search in Rotated Sorted Array ❌ Medium LeetCode -
9 3Sum ❌ Medium LeetCode -
10 Container With Most Water ✅ Medium LeetCode Answer

Binary

# Problem Status Level Link Answer
1 Sum of Two Integers ❌ Medium LeetCode  
2 Number of 1 Bits ❌ Easy LeetCode  
3 Counting Bits ❌ Easy LeetCode  
4 Missing Number ❌ Easy LeetCode  
5 Reverse Bits ❌ Easy LeetCode  

Dynamic Programming

# Problem Status Level Link Answer
1 Climbing Stairs ❌ Easy LeetCode  
2 Coin Change ❌ Medium LeetCode  
3 Longest Increasing Subsequence ❌ Medium LeetCode  
4 Longest Common Subsequence ❌ Medium LeetCode  
5 Word Break Problem ❌ Medium LeetCode  
6 Combination Sum ❌ Medium LeetCode  
7 House Robber ❌ Medium LeetCode  
8 House Robber II ❌ Medium LeetCode  
9 Decode Ways ❌ Medium LeetCode  
10 Unique Paths ❌ Medium LeetCode  
11 Jump Game ❌ Medium LeetCode  

Graph

# Problem Status Level Link Answer
1 Clone Graph ❌ Medium LeetCode  
2 Course Schedule ❌ Medium LeetCode  
3 Pacific Atlantic Water Flow ❌ Medium LeetCode  
4 Number of Islands ❌ Medium LeetCode  
5 Longest Consecutive Sequence ❌ Medium LeetCode  
6 Alien Dictionary (Leetcode Premium) ❌ Hard LeetCode  
7 Graph Valid Tree (Leetcode Premium) ❌ Medium LeetCode  
8 Number of Connected Components in an Undirected Graph (Leetcode Premium) ❌ Medium LeetCode  

Interval

# Problem Status Level Link Answer
1 Insert Interval ❌ Medium LeetCode  
2 Merge Intervals ❌ Medium LeetCode  
3 Non-overlapping Intervals ❌ Medium LeetCode  
4 Meeting Rooms (Leetcode Premium) ❌ Medium LeetCode  
5 Meeting Rooms II (Leetcode Premium) ❌ Medium LeetCode  

Linked List

# Problem Status Level Link Answer
1 Reverse a Linked List ✅ Easy LeetCode Answer
2 Detect Cycle in a Linked List ✅ Easy LeetCode Answer
3 Merge Two Sorted Lists ✅ Easy LeetCode Answer
4 Merge K Sorted Lists ❌ Hard LeetCode  
5 Remove Nth Node From End Of List ✅ Medium LeetCode Answer
6 Reorder List ❌ Medium LeetCode  

Matrix

# Problem Status Level Link Answer
1 Set Matrix Zeroes ❌ Medium LeetCode  
2 Spiral Matrix ❌ Medium LeetCode  
3 Rotate Image ❌ Medium LeetCode  
4 Word Search ❌ Medium LeetCode  

String

# Problem Status Level Link Answer
1 Longest Substring Without Repeating Chars ❌ Medium LeetCode  
2 Longest Repeating Character Replacement ❌ Medium LeetCode  
3 Minimum Window Substring ❌ Hard LeetCode  
4 Valid Anagram ❌ Easy LeetCode  
5 Group Anagrams ❌ Easy LeetCode  
6 Valid Parentheses ✅ Easy LeetCode Answer
7 Valid Palindrome ✅ Easy LeetCode Answer
8 Longest Palindromic Substring ❌ Medium LeetCode  
9 Palindromic Substrings ❌ Medium LeetCode  
10 Encode and Decode Strings (Leetcode Premium) ❌ Hard LeetCode  

Tree

# Problem Status Level Link Answer
1 Maximum Depth of Binary Tree ✅ Easy LeetCode Answer
2 Same Tree ✅ Easy LeetCode Answer
3 Invert/Flip Binary Tree ❌ Easy LeetCode  
4 Binary Tree Maximum Path Sum ❌ Hard LeetCode  
5 Binary Tree Level Order Traversal ❌ Medium LeetCode  
6 Serialize and Deserialize Binary Tree ❌ Hard LeetCode  
7 Subtree of Another Tree ❌ Medium LeetCode  
8 Construct Binary Tree from Preorder & Inorder Traversal ❌ Medium LeetCode  
9 Validate Binary Search Tree ❌ Medium LeetCode  
10 Kth Smallest Element in a BST ❌ Medium LeetCode  
11 Lowest Common Ancestor of BST ❌ Medium LeetCode  
12 Implement Trie (Prefix Tree) ❌ Medium LeetCode  
13 Add and Search Word ❌ Medium LeetCode  
14 Word Search II ❌ Hard LeetCode  

Heap

# Problem Status Level Link Answer
1 Merge K Sorted Lists ❌ Hard LeetCode  
2 Top K Frequent Elements ❌ Medium LeetCode  
3 Find Median from Data Stream ❌ Hard LeetCode  

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