LeetCode

https://leetcode.com

June LeetCoding Challenge

Click here for problem descriptions.

Solutions in various programming languages are provided. Enjoy it.

Coming soon...

May LeetCoding Challenge

Click here for problem descriptions.

Solutions in various programming languages are provided. Enjoy it.

1. First Bad String: Binary search.
2. Jewels and Stones: Hash Table
3. Ransom Note: Hash Table
4. Number Complement: Bitwise Manipulation
5. First Unique Character In a String: Hash Table
6. Majority Element: Ad hoc
7. Cousins in Binary Tree: BFS / Recursion
8. Check if it is straight line: Cross Product
9. Valid Perfect Square: Math
10. Find the Town Judge: Graph Theory
11. Flood Fill: BFS
12. Single Element In a Sorted Array: Binary Search
13. Remove K Digits: Greedy
14. Implement Trie: Trie
15. Maximum Sum Circular Subarray: DP
16. Odd Even Linked List: Linked List
17. Find All Anagrams in a String: Sliding window + Hash Table
18. Permutation In String: Sliding window + Hash Table
19. Online Stock Span: DP
20. Kth-Smallest-Element-In-A-BST: BST
21. Count Square Submatrices with All Ones: DP
22. Sort Characters By Frequency: Hash Table
23. Interval List Intersections: Two Pointers
24. Construct Binary Search Tree from Preorder Traversal: Binary Search Tree
25. Uncrossed Lines: DP
26. Contiguous Array: Hash Table
27. Possible Bipartition: Bipartite Graph
28. Counting Bits: Math
29. Course Schedule: Topological Sort
30. K Closest Points to Origin: Priority_queue, Sort
31. Edit Distance: DP

30-Day (April) LeetCoding Challenge

Click here for problem descriptions.

1. Single Number: Bitwise Manipulation
2. Happy Number: Implementation
3. Maximum Subarray: DP
4. Move Zeros: Two pointers
5. Best Time to Buy and Sell Stock II: Greedy
6. Group Anagrams: Hash Table