Algorithm Challenges

Important

This repository contains a collection of coding challenges with solutions, including links to LeetCode and LintCode problems. Whether you're a beginner or an experienced coder, these challenges are designed to enhance your problem-solving skills and algorithmic thinking.

Getting Started

• Each challenge is categorized by difficulty: Easy, Medium, or Hard.
• Click on the LeetCode or LintCode links to access the problem statement and submit your solution.
• Solutions are provided in this repository (resources folder) to help you learn and compare your approach. (if missing, feel free to open an issue or pull request)

Challenges Table

Name	Link	Difficulty	Resolution
1. Two Sum		easy	Two Sum Solution by @Kjur0
2. Add Two Numbers		medium
4. Median of Two Sorted Arrays		hard
5. Longest Palindromic Substring		medium
7. Reverse Integer		medium	Reverse Integer Solution by @Kjur0
11. Container With Most Water		medium
12. Integer to Roman		medium
13. Roman to Integer		easy
14. Longest Common Prefix		easy
15. 3Sum		medium
18. 4Sum		medium
20. Valid Parentheses		easy
21. Merge Two Sorted Lists		easy
22. Generate Parentheses		medium
23. Merge k Sorted Lists		hard
25. Reverse Nodes in k-Group		hard
27. Remove Element		easy
31. Next Permutation		medium
33. Search in Rotated Sorted Array		medium
35. Search Insert Position		easy
48. Rotate Image		medium
52. N-Queens II		hard
55. Jump Game		medium
56. Merge Intervals		medium
57. Insert Interval		medium
62. Unique Paths		medium
68. Text Justification		hard
78. Subsets		medium
86. Partition List		medium
88. Merge Sorted Array		easy
104. Maximum Depth of Binary Tree		easy
121. Best Time to Buy and Sell Stock		easy
128. Longest Consecutive Sequence		medium
136. Single Number		easy
137. Single Number II		medium
146. LRU Cache		medium
185. Department Top Three Salaries		hard
189. Rotate Array		medium
198. House Robber		medium
207. Course Schedule		medium
210. Course Schedule II		medium
213. House Robber II		medium
217. Contains Duplicate		easy
239. Sliding Window Maximum		hard
253. Meeting Rooms II		medium
258. Add Digits		easy
283. Move Zeroes		easy
300. Longest Increasing Subsequence		medium
312. Burst Balloons		hard
329. Longest Increasing Path in a Matrix		hard
359. Logger Rate Limiter		easy
384. Shuffle an Array		medium
394. Decode String		medium
402. Remove K Digits		medium
424. Longest Repeating Character Replacement		medium
427. Construct Quad Tree		medium
540. Single Element in a Sorted Array		medium
542. 01 Matrix		medium
567. Permutation in String		medium
685. Redundant Connection II		hard
692. Top K Frequent Words		medium
715. Range Module		hard
759. Employee Free Time		hard
818. Race Car		hard
837. New 21 Game		medium
843. Guess the Word		hard
844. Backspace String Compare		easy
862. Shortest Subarray with Sum at Least K		hard
875. Koko Eating Bananas		medium
934. Shortest Bridge		medium
938. Range Sum of BST		easy
958. Check Completeness of a Binary Tree		medium
974. Subarray Sums Divisible by K		medium
975. Odd Even Jump		hard
1011. Capacity To Ship Packages Within D Days		medium
1101. The Earliest Moment When Everyone Become Friends		medium
1110. Delete Nodes And Return Forest		medium
1136. Parallel Courses		medium
1148. Article Views I		easy
1207. Unique Number of Occurrences		easy
1249. Minimum Remove to Make Valid Parentheses		medium
1254. Number of Closed Islands		medium
1376. Time Needed to Inform All Employees		medium
1480. Running Sum of 1d Array		easy
1514. Path with Maximum Probability		medium
1639. Number of Ways to Form a Target String Given a Dictionary		hard
1672. Richest Customer Wealth		easy
1768. Merge Strings Alternately		easy
1803. Count Pairs With XOR in a Range		hard
1834. Single-Threaded CPU		medium
1857. Largest Color Value in a Directed Graph		hard
1971. Find if Path Exists in Graph		easy
2007. Find Original Array From Doubled Array		medium
2101. Detonate the Maximum Bombs		medium
2332. The Latest Time to Catch a Bus		medium
2402. Metting Rooms III		hard
2407. Longest Increasing Subsequence II		hard
2448. Minimum Cost to Make Array Equal		hard
2458. Height of Binary Tree After Subtree Removal Queries		hard
2667. Create Hello World Function		easy
2713. Maximum Strictly Increasing Cells in a Matrix		hard

Contributing

If you'd like to contribute more challenges, solutions, or improvements to the README, feel free to open a pull request. Your contributions are highly appreciated!

Happy coding! 💻✨