LeetCode Problem Solutions

📘 A collection of algorithmic problem solutions from LeetCode, implemented in C++.

Overview

This repository contains curated solutions to a variety of LeetCode problems, all written in C++. It serves as a resource for practicing and improving your problem-solving skills across different topics and difficulty levels.

About the Problems

LeetCode is a leading platform for preparing technical coding interviews and enhancing algorithmic thinking. The problems here are selected from LeetCode and solved using clean, efficient, and well-documented C++ code.

Feel free to explore different solutions and approaches. There's often more than one way to solve a problem—experiment, debug, and learn as you go.

Accessing the Problems

All problems can be accessed via the LeetCode website.
Each solution in this repository is named according to the problem title or number, making it easier to find the corresponding question.

Topics Covered

This repository includes solutions to problems involving:

Arrays & Strings
Hash Tables
Two Pointers
Sliding Window
Recursion & Backtracking
Binary Search
Stack & Queue
Linked Lists & Trees
Graphs (BFS, DFS)
Dynamic Programming
Greedy Algorithms
Sorting & Searching

Objectives

The main objectives of this repository are to:

Strengthen algorithmic and logical thinking
Improve coding fluency in C++
Prepare for coding interviews and technical assessments
Practice structured problem-solving under constraints
Build a strong foundation for competitive programming

Contributing

Contributions are welcome and appreciated!
If you'd like to add a solution, suggest an improvement, or report an issue, feel free to open a pull request or submit an issue. Let’s make this a valuable resource for all learners.

Disclaimer

All problem statements are the property of LeetCode.
The solutions provided here are for educational purposes only. They should not be used for cheating in contests or interviews.

Happy Coding! 🚀

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LeetCode Problem Solutions

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Name		Name	Last commit message	Last commit date
Latest commit History 170 Commits
1. Two Sum.cpp		1. Two Sum.cpp
100. Same Tree.cpp		100. Same Tree.cpp
102. Binary Tree Level Order Traversal.cpp		102. Binary Tree Level Order Traversal.cpp
1028. Recover a Tree From Preorder Traversal.cpp		1028. Recover a Tree From Preorder Traversal.cpp
1038. Binary Search Tree to Greater Sum Tree.cpp		1038. Binary Search Tree to Greater Sum Tree.cpp
104. Maximum Depth of Binary Tree.cpp		104. Maximum Depth of Binary Tree.cpp
105. Construct Binary Tree from Preorder and Inorder Traversal.cpp		105. Construct Binary Tree from Preorder and Inorder Traversal.cpp
1079. Letter Tile Possibilities.cpp		1079. Letter Tile Possibilities.cpp
108. Convert Sorted Array to Binary Search Tree.cpp		108. Convert Sorted Array to Binary Search Tree.cpp
1092. Shortest Common Supersequence .cpp		1092. Shortest Common Supersequence .cpp
11. Container With Most Water.cpp		11. Container With Most Water.cpp
110. Balanced Binary Tree.cpp		110. Balanced Binary Tree.cpp
1108. Defanging an IP Address.cpp		1108. Defanging an IP Address.cpp
112. Path Sum.cpp		112. Path Sum.cpp
1123. Lowest Common Ancestor of Deepest Leaves.cpp		1123. Lowest Common Ancestor of Deepest Leaves.cpp
118. Pascal's Triangle.cpp		118. Pascal's Triangle.cpp
1189. Maximum Number of Balloons.cpp		1189. Maximum Number of Balloons.cpp
121. Best Time to Buy and Sell Stock.cpp		121. Best Time to Buy and Sell Stock.cpp
122. Best Time to Buy and Sell Stock II.cpp		122. Best Time to Buy and Sell Stock II.cpp
125. Valid Palindrome.cpp		125. Valid Palindrome.cpp
1261. Find Elements in a Contaminated Binary Tree.cpp		1261. Find Elements in a Contaminated Binary Tree.cpp
128. Longest Consecutive Sequence.cpp		128. Longest Consecutive Sequence.cpp
1299. Replace Elements with Greatest Element on Right Side.cpp		1299. Replace Elements with Greatest Element on Right Side.cpp
1352. Product of the Last K Numbers.cpp		1352. Product of the Last K Numbers.cpp
1358. Number of Substrings Containing All Three Characters.cpp		1358. Number of Substrings Containing All Three Characters.cpp
138. Copy List with Random Pointer.cpp		138. Copy List with Random Pointer.cpp
1382. Balance a Binary Search Tree.cpp		1382. Balance a Binary Search Tree.cpp
14. Longest Common Prefix.cpp		14. Longest Common Prefix.cpp
141. Linked List Cycle.cpp		141. Linked List Cycle.cpp
1415. The k-th Lexicographical String of All Happy Strings of Length n.cpp		1415. The k-th Lexicographical String of All Happy Strings of Length n.cpp
143. Reorder List.cpp		143. Reorder List.cpp
144. Binary Tree Preorder Traversal.cpp		144. Binary Tree Preorder Traversal.cpp
1448. Count Good Nodes in Binary Tree.cpp		1448. Count Good Nodes in Binary Tree.cpp
145. Binary Tree Postorder Traversal.cpp		145. Binary Tree Postorder Traversal.cpp
1498. Number of Subsequences That Satisfy the Given Sum Condition.cpp		1498. Number of Subsequences That Satisfy the Given Sum Condition.cpp
15. 3Sum.cpp		15. 3Sum.cpp
150. Evaluate Reverse Polish Notation.cpp		150. Evaluate Reverse Polish Notation.cpp
1524. Number of Sub-arrays With Odd Sum.cpp		1524. Number of Sub-arrays With Odd Sum.cpp
153. Find Minimum in Rotated Sorted Array.cpp		153. Find Minimum in Rotated Sorted Array.cpp
155. Min Stack.cpp		155. Min Stack.cpp
1579. Remove Max Number of Edges to Keep Graph Fully Traversable.cpp		1579. Remove Max Number of Edges to Keep Graph Fully Traversable.cpp
167. Two Sum II - Input Array Is Sorted.cpp		167. Two Sum II - Input Array Is Sorted.cpp
169. Majority Element.cpp		169. Majority Element.cpp
1718. Construct the Lexicographically Largest Valid Sequence.cpp		1718. Construct the Lexicographically Largest Valid Sequence.cpp
1749. Maximum Absolute Sum of Any Subarray.cpp		1749. Maximum Absolute Sum of Any Subarray.cpp
1780. Check if Number is a Sum of Powers of Three.cpp		1780. Check if Number is a Sum of Powers of Three.cpp
179. Largest Number.cpp		179. Largest Number.cpp
1791. Find Center of Star Graph.cpp		1791. Find Center of Star Graph.cpp
1800. Maximum Ascending Subarray Sum.cpp		1800. Maximum Ascending Subarray Sum.cpp
1863. Sum of All Subset XOR Totals.cpp		1863. Sum of All Subset XOR Totals.cpp
187. Repeated DNA Sequences.cpp		187. Repeated DNA Sequences.cpp
189. Rotate Array.cpp		189. Rotate Array.cpp
19. Remove Nth Node From End of List.cpp		19. Remove Nth Node From End of List.cpp
1922. Count Good Numbers.cpp		1922. Count Good Numbers.cpp
1930. Unique Length-3 Palindromic Subsequences.cpp		1930. Unique Length-3 Palindromic Subsequences.cpp
1963. Minimum Number of Swaps to Make the String Balanced.cpp		1963. Minimum Number of Swaps to Make the String Balanced.cpp
1976. Number of Ways to Arrive at Destination.cpp		1976. Number of Ways to Arrive at Destination.cpp
1980. Find Unique Binary String.cpp		1980. Find Unique Binary String.cpp
199. Binary Tree Right Side View.cpp		199. Binary Tree Right Side View.cpp
2. Add Two Numbers.cpp		2. Add Two Numbers.cpp
20. Valid Parentheses.cpp		20. Valid Parentheses.cpp
203. Remove Linked List Elements.cpp		203. Remove Linked List Elements.cpp
2033. Minimum Operations to Make a Uni-Value Grid.cpp		2033. Minimum Operations to Make a Uni-Value Grid.cpp
205. Isomorphic Strings.cpp		205. Isomorphic Strings.cpp
206. Reverse Linked List.cpp		206. Reverse Linked List.cpp
21. Merge Two Sorted Lists.cpp		21. Merge Two Sorted Lists.cpp
2115. Find All Possible Recipes from Given Supplies.cpp		2115. Find All Possible Recipes from Given Supplies.cpp
2140. Solving Questions With Brainpower.cpp		2140. Solving Questions With Brainpower.cpp
2161. Partition Array According to Given Pivot.cpp		2161. Partition Array According to Given Pivot.cpp
217. Contains Duplicate.cpp		217. Contains Duplicate.cpp
2192. All Ancestors of a Node in a Directed Acyclic Graph.cpp		2192. All Ancestors of a Node in a Directed Acyclic Graph.cpp
2206. Divide Array Into Equal Pairs.cpp		2206. Divide Array Into Equal Pairs.cpp
2226. Maximum Candies Allocated to K Children.cpp		2226. Maximum Candies Allocated to K Children.cpp
225. Implement Stack using Queues.cpp		225. Implement Stack using Queues.cpp
226. Invert Binary Tree.cpp		226. Invert Binary Tree.cpp
2278. Percentage of Letter in String.cpp		2278. Percentage of Letter in String.cpp
2285. Maximum Total Importance of Roads.cpp		2285. Maximum Total Importance of Roads.cpp
234. Palindrome Linked List.cpp		234. Palindrome Linked List.cpp
235. Lowest Common Ancestor of a Binary Search Tree.cpp		235. Lowest Common Ancestor of a Binary Search Tree.cpp
2375. Construct Smallest Number From DI String.cpp		2375. Construct Smallest Number From DI String.cpp
2379. Minimum Recolors to Get K Consecutive Black Blocks.cpp		2379. Minimum Recolors to Get K Consecutive Black Blocks.cpp
2401. Longest Nice Subarray.cpp		2401. Longest Nice Subarray.cpp
242. Valid Anagram.cpp		242. Valid Anagram.cpp
2460. Apply Operations to an Array.cpp		2460. Apply Operations to an Array.cpp
2467. Most Profitable Path in a Tree.cpp		2467. Most Profitable Path in a Tree.cpp
2503. Maximum Number of Points From Grid Queries.cpp		2503. Maximum Number of Points From Grid Queries.cpp
2523. Closest Prime Numbers in Range.cpp		2523. Closest Prime Numbers in Range.cpp
2529. Maximum Count of Positive Integer and Negative Integer.cpp		2529. Maximum Count of Positive Integer and Negative Integer.cpp
2551. Put Marbles in Bags.cpp		2551. Put Marbles in Bags.cpp
2560. House Robber IV.cpp		2560. House Robber IV.cpp
2570. Merge Two 2D Arrays by Summing Values.cpp		2570. Merge Two 2D Arrays by Summing Values.cpp
2579. Count Total Number of Colored Cells.cpp		2579. Count Total Number of Colored Cells.cpp
2594. Minimum Time to Repair Cars.cpp		2594. Minimum Time to Repair Cars.cpp
2685. Count the Number of Complete Components.cpp		2685. Count the Number of Complete Components.cpp
2698. Find the Punishment Number of an Integer.cpp		2698. Find the Punishment Number of an Integer.cpp
27. Remove Element.cpp		27. Remove Element.cpp
2780. Minimum Index of a Valid Split.cpp		2780. Minimum Index of a Valid Split.cpp
2818. Apply Operations to Maximize Score.cpp		2818. Apply Operations to Maximize Score.cpp
283. Move Zeroes.cpp		283. Move Zeroes.cpp
2843. Count Symmetric Integers.cpp		2843. Count Symmetric Integers.cpp

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