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.
- 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)
| 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 |
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! 💻✨