🚀 My DSA Journey | #RoadToSDE

Welcome to my Data Structures & Algorithms (DSA) Journey repository!
This repo serves as my personal tracker for solving DSA problems and refining my problem-solving skills.

The goal is to consistently practice, optimize solutions, and master DSA concepts to prepare for coding interviews.

📜 Blind 75 DSA Questions

1️⃣ Arrays & Hashing

• 🟢 Contains Duplicate (Easy) – LeetCode 217
• 🟠 Valid Anagram (Easy) – LeetCode 242
• 🔴 Two Sum (Easy) – LeetCode 1
• 🟠 Group Anagrams (Medium) – LeetCode 49
• 🟠 Top K Frequent Elements (Medium) – LeetCode 347
• 🔴 Product of Array Except Self (Medium) – LeetCode 238
• 🔴 Valid Sudoku (Medium) – LeetCode 36
• 🔴 Encode and Decode Strings (Medium) – LeetCode 271

2️⃣ Two Pointers

• 🔴 Valid Palindrome (Easy) – LeetCode 125
• 🔴 Two Sum II - Input Array Is Sorted (Medium) – LeetCode 167
• 🔴 3Sum (Medium) – LeetCode 15
• 🔴 Container With Most Water (Medium) – LeetCode 11
• 🔴 Trapping Rain Water (Hard) – LeetCode 42

3️⃣ Sliding Window

• 🔴 Best Time to Buy and Sell Stock (Easy) – LeetCode 121
• 🔴 Longest Substring Without Repeating Characters (Medium) – LeetCode 3
• 🔴 Longest Repeating Character Replacement (Medium) – LeetCode 424
• 🔴 Permutation in String (Medium) – LeetCode 567
• 🔴 Minimum Window Substring (Hard) – LeetCode 76

4️⃣ Stack

• 🔴 Valid Parentheses (Easy) – LeetCode 20
• 🔴 Min Stack (Medium) – LeetCode 155
• 🔴 Evaluate Reverse Polish Notation (Medium) – LeetCode 150
• 🔴 Generate Parentheses (Medium) – LeetCode 22
• 🔴 Daily Temperatures (Medium) – LeetCode 739
• 🔴 Car Fleet (Medium) – LeetCode 853
• 🔴 Largest Rectangle in Histogram (Hard) – LeetCode 84

5️⃣ Binary Search

• 🔴 Binary Search (Easy) – LeetCode 704
• 🔴 Search in Rotated Sorted Array (Medium) – LeetCode 33
• 🔴 Find Minimum in Rotated Sorted Array (Medium) – LeetCode 153
• 🔴 Koko Eating Bananas (Medium) – LeetCode 875
• 🔴 Median of Two Sorted Arrays (Hard) – LeetCode 4

6️⃣ Linked List

• 🔴 Reverse a Linked List (Easy) – LeetCode 206
• 🔴 Merge Two Sorted Lists (Easy) – LeetCode 21
• 🔴 Reorder List (Medium) – LeetCode 143
• 🔴 Remove Nth Node from End of List (Medium) – LeetCode 19
• 🔴 Copy List with Random Pointer (Medium) – LeetCode 138
• 🔴 Linked List Cycle (Easy) – LeetCode 141
• 🔴 Find the Duplicate Number (Medium) – LeetCode 287

7️⃣ Trees

• 🔴 Invert Binary Tree (Easy) – LeetCode 226
• 🔴 Maximum Depth of Binary Tree (Easy) – LeetCode 104
• 🔴 Same Tree (Easy) – LeetCode 100
• 🔴 Subtree of Another Tree (Easy) – LeetCode 572
• 🔴 Lowest Common Ancestor of a BST (Medium) – LeetCode 235
• 🔴 Binary Tree Level Order Traversal (Medium) – LeetCode 102
• 🔴 Serialize and Deserialize Binary Tree (Hard) – LeetCode 297

8️⃣ Graphs

• 🔴 Number of Islands (Medium) – LeetCode 200
• 🔴 Clone Graph (Medium) – LeetCode 133
• 🔴 Pacific Atlantic Water Flow (Medium) – LeetCode 417
• 🔴 Course Schedule (Medium) – LeetCode 207
• 🔴 Network Delay Time (Medium) – LeetCode 743
• 🔴 Word Ladder (Hard) – LeetCode 127

9️⃣ Dynamic Programming

• 🔴 Climbing Stairs (Easy) – LeetCode 70
• 🔴 House Robber (Medium) – LeetCode 198
• 🔴 Coin Change (Medium) – LeetCode 322
• 🔴 Longest Increasing Subsequence (Medium) – LeetCode 300
• 🔴 Longest Common Subsequence (Medium) – LeetCode 1143
• 🔴 Word Break (Medium) – LeetCode 139

🔟 Bit Manipulation

• 🔴 Single Number (Easy) – LeetCode 136
• 🔴 Number of 1 Bits (Easy) – LeetCode 191
• 🔴 Counting Bits (Easy) – LeetCode 338
• 🔴 Reverse Bits (Easy) – LeetCode 190

🎯 Goals

✔ Solve All 75 Problems
✔ Master Optimal Approaches
✔ Track Progress with ✅

🔥 Topics Covered

• ✅ Arrays
• ✅ Strings
• ✅ Linked Lists
• ✅ Stacks & Queues
• ✅ Trees & Graphs
• ✅ Sorting & Searching
• ✅ Dynamic Programming
• ✅ Greedy Algorithms
• ✅ Recursion & Backtracking
• ✅ Bit Manipulation

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Thank you for your time! Happy Coding! 🌟 Star this repo if you're also on the DSA journey! ⭐