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Hey, this repository consists of solutions of all the questions I have attempted on Leetcode.

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SahajDang/LeetCode_Problems

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273 Commits
1. Two Sum.java
1. Two Sum.java
 
 
100. Same Tree.java
100. Same Tree.java
 
 
1009. Complement of Base 10 Integer.java
1009. Complement of Base 10 Integer.java
 
 
102. Binary Tree Level Order Traversal.java
102. Binary Tree Level Order Traversal.java
 
 
1025. Divisor Game.java
1025. Divisor Game.java
 
 
103. Binary Tree Zigzag Level Order Traversal.java
103. Binary Tree Zigzag Level Order Traversal.java
 
 
104. Maximum Depth of Binary Tree
104. Maximum Depth of Binary Tree
 
 
1047. Remove All Adjacent Duplicates In String.java
1047. Remove All Adjacent Duplicates In String.java
 
 
105. Construct Binary Tree from Preorder and Inorder Traversal
105. Construct Binary Tree from Preorder and Inorder Traversal
 
 
1061. Lexicographically Smallest Equivalent String.java
1061. Lexicographically Smallest Equivalent String.java
 
 
107. Binary Tree Level Order Traversal II.java
107. Binary Tree Level Order Traversal II.java
 
 
108. Convert Sorted Array to Binary Search Tree.java
108. Convert Sorted Array to Binary Search Tree.java
 
 
11. Container With Most Water.java
11. Container With Most Water.java
 
 
110. Balanced Binary Tree
110. Balanced Binary Tree
 
 
111. Minimum Depth of Binary Tree.java
111. Minimum Depth of Binary Tree.java
 
 
112. Path Sum.java
112. Path Sum.java
 
 
1137. N-th Tribonacci Number.java
1137. N-th Tribonacci Number.java
 
 
118. Pascal's Triangle.java
118. Pascal's Triangle.java
 
 
119. Pascal's Triangle II.java
119. Pascal's Triangle II.java
 
 
12. Integer to Roman.java
12. Integer to Roman.java
 
 
1200. Minimum Absolute Difference.java
1200. Minimum Absolute Difference.java
 
 
1206. Design Skiplist.java
1206. Design Skiplist.java
 
 
1207. Unique Number of Occurrences.java
1207. Unique Number of Occurrences.java
 
 
121. Best Time to Buy and Sell Stock.java
121. Best Time to Buy and Sell Stock.java
 
 
122. Best Time to Buy and Sell Stock II.java
122. Best Time to Buy and Sell Stock II.java
 
 
123. Best Time to Buy and Sell Stock III.java
123. Best Time to Buy and Sell Stock III.java
 
 
125. Valid Palindrome.java
125. Valid Palindrome.java
 
 
128. Longest Consecutive Sequence
128. Longest Consecutive Sequence
 
 
129. Sum Root to Leaf Numbers.java
129. Sum Root to Leaf Numbers.java
 
 
1290. Convert Binary Number in a Linked List to Integer
1290. Convert Binary Number in a Linked List to Integer
 
 
1298. Maximum Candies You Can Get from Boxes.java
1298. Maximum Candies You Can Get from Boxes.java
 
 
1310. XOR Queries of a Subarray
1310. XOR Queries of a Subarray
 
 
134. Gas Station.java
134. Gas Station.java
 
 
135. Candy.java
135. Candy.java
 
 
1353. Maximum Number of Events That Can Be Attended.java
1353. Maximum Number of Events That Can Be Attended.java
 
 
136. Single Number.java
136. Single Number.java
 
 
137. Single Number II.java
137. Single Number II.java
 
 
1389. Create Target Array in the Given Order
1389. Create Target Array in the Given Order
 
 
1394. Find Lucky Integer in an Array
1394. Find Lucky Integer in an Array
 
 
142. Linked List Cycle_II.java
142. Linked List Cycle_II.java
 
 
143. Reorder List
143. Reorder List
 
 
1432. Max Difference You Can Get From Changing an Integer.java
1432. Max Difference You Can Get From Changing an Integer.java
 
 
144. Binary Tree Preorder Traversal.java
144. Binary Tree Preorder Traversal.java
 
 
1448. Count Good Nodes in Binary Tree.java
1448. Count Good Nodes in Binary Tree.java
 
 
145. Binary Tree Postorder Traversal.java
145. Binary Tree Postorder Traversal.java
 
 
146. LRU Cache.java
146. LRU Cache.java
 
 
148. Sort List
148. Sort List
 
 
1480. Running_Sum of 1d Array.java
1480. Running_Sum of 1d Array.java
 
 
1491. Average Salary Excluding the Minimum and Maximum Salary.java
1491. Average Salary Excluding the Minimum and Maximum Salary.java
 
 
1498. Number of Subsequences That Satisfy the Given Sum Condition.java
1498. Number of Subsequences That Satisfy the Given Sum Condition.java
 
 
15. 3Sum.java
15. 3Sum.java
 
 
1512. Number of Good Pairs
1512. Number of Good Pairs
 
 
153. Find Minimum in Rotated Sorted Array.java
153. Find Minimum in Rotated Sorted Array.java
 
 
154. Find Minimum in Rotated Sorted Array II.java
154. Find Minimum in Rotated Sorted Array II.java
 
 
1544. Make The String Great.java
1544. Make The String Great.java
 
 
155. Min Stack.java
155. Min Stack.java
 
 
1572. Matrix Diagonal Sum.java
1572. Matrix Diagonal Sum.java
 
 
16. 3Sum Closest.java
16. 3Sum Closest.java
 
 
162. Find Peak Element.java
162. Find Peak Element.java
 
 
165. Compare Version Numbers.java
165. Compare Version Numbers.java
 
 
167. Two Sum II - Input Array Is Sorted(Reduced Time Complexity).java
167. Two Sum II - Input Array Is Sorted(Reduced Time Complexity).java
 
 
167. Two Sum II - Input Array Is Sorted.java
167. Two Sum II - Input Array Is Sorted.java
 
 
169. Majority Element.java
169. Majority Element.java
 
 
1721. Swapping Nodes in a Linked List.java
1721. Swapping Nodes in a Linked List.java
 
 
1751. Maximum Number of Events That Can Be Attended II.java
1751. Maximum Number of Events That Can Be Attended II.java
 
 
18. 4Sum.java
18. 4Sum.java
 
 
1814. Count Nice Pairs in an Array.java
1814. Count Nice Pairs in an Array.java
 
 
1865. Finding Pairs With a Certain Sum.java
1865. Finding Pairs With a Certain Sum.java
 
 
188. Best Time to Buy and Sell Stock IV.java
188. Best Time to Buy and Sell Stock IV.java
 
 
189. Rotate Array.java
189. Rotate Array.java
 
 
19. Remove Nth Node From End of List.java
19. Remove Nth Node From End of List.java
 
 
190. Reverse Bits.java
190. Reverse Bits.java
 
 
1900. The Earliest and Latest Rounds Where Players Compete.java
1900. The Earliest and Latest Rounds Where Players Compete.java
 
 
191. Number of 1 Bits.java
191. Number of 1 Bits.java
 
 
199. Binary Tree Right Side View
199. Binary Tree Right Side View
 
 
2. Add Two Numbers.java
2. Add Two Numbers.java
 
 
20. Valid Parentheses.java
20. Valid Parentheses.java
 
 
200. Number of Islands.java
200. Number of Islands.java
 
 
2006. Count Number of Pairs With Absolute Difference K.java
2006. Count Number of Pairs With Absolute Difference K.java
 
 
2014. Longest Subsequence Repeated k Times.java
2014. Longest Subsequence Repeated k Times.java
 
 
2016. Maximum Difference Between Increasing Elements.java
2016. Maximum Difference Between Increasing Elements.java
 
 
202. Happy Number.java
202. Happy Number.java
 
 
203. Remove Linked List Elements.java
203. Remove Linked List Elements.java
 
 
204. Count Primes.java
204. Count Primes.java
 
 
2040. Kth Smallest Product of Two Sorted Arrays.java
2040. Kth Smallest Product of Two Sorted Arrays.java
 
 
205. Isomorphic Strings.java
205. Isomorphic Strings.java
 
 
206. Reverse Linked List.java
206. Reverse Linked List.java
 
 
207. Course Schedule.java
207. Course Schedule.java
 
 
2071. Maximum Number of Tasks You Can Assign.java
2071. Maximum Number of Tasks You Can Assign.java
 
 
2081. Sum of k-Mirror Numbers.java
2081. Sum of k-Mirror Numbers.java
 
 
2095. Delete the Middle Node of a Linked List.java
2095. Delete the Middle Node of a Linked List.java
 
 
2099. Find Subsequence of Length K With the Largest Sum.java
2099. Find Subsequence of Length K With the Largest Sum.java
 
 
21. Merge Two Sorted Lists.java
21. Merge Two Sorted Lists.java
 
 
2138. Divide a String Into Groups of Size k.java
2138. Divide a String Into Groups of Size k.java
 
 
215. Kth Largest Element in an Array.java
215. Kth Largest Element in an Array.java
 
 
217. Contains Duplicate.java
217. Contains Duplicate.java
 
 
2176. Count Equal and Divisible Pairs in an Array.java
2176. Count Equal and Divisible Pairs in an Array.java
 
 
219. Contains Duplicate II.java
219. Contains Duplicate II.java
 
 
22. Generate Parentheses.java
22. Generate Parentheses.java
 
 
2200. Find All K-Distant Indices in an Array.java
2200. Find All K-Distant Indices in an Array.java
 
 

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LeetCode Problems

Welcome to my LeetCode Problems repository! 👨‍💻
This repository contains clean, well-optimized, and explained solutions to various coding challenges from LeetCode. It's a collection of problems I’ve solved as part of my journey to strengthen my data structures and algorithms knowledge.

📌 About

  • 🧠 Solutions are written with readability and efficiency in mind.
  • 📂 Organized by topic and difficulty (Easy, Medium, Hard).
  • 🏆 Ideal for technical interview preparation.
  • 🛠️ Languages Used: Java.

🚀 How to Use

  1. Clone the repository: 
    git clone https://github.com/SahajDang/LeetCode_Problems.git
cd LeetCode_Problems

Each file is named according to the problem.

🤝 Contributions

  • Feel free to fork the repo and suggest improvements or optimizations! Pull requests are welcome if you find a better solution or want to fix something.

📬 Contact If you'd like to connect or have any suggestions, feel free to reach out via LinkedIn or GitHub!

Happy Coding! 🚀✨ – Sahaj Dang

About

Hey, this repository consists of solutions of all the questions I have attempted on Leetcode.

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