Leetcode Questions Practice

Click on difficulty buttons (Easy, Medium, Hard) or Tags or company to filter that category problems only.

#	Title	Sol	Companies	Difficulty	Tags
1	Two Sum				Array, Hash Table
2	Add Two Numbers				Linked List, Math, Recursion
5	Longest Palindromic Substring				String, DP
20	Valid Parentheses				String, Stack
21	Merge Two Sorted Lists				Linked List, Recursion
23	Merge K Sorted Links				Linked List, Divide And Conquer, Priority Queue, Merge Sort
42	Trapping Rain Water				Array, Two Pointers, DP, Stack
127	Word Ladder				Hash Table, String, BFS
138	Copy List with Random Pointers				Hash Table, Linked List
146	LRU Cache				Hash Table, Linked List, Design, Doubly Linked List
200	Number of Islands				Array, DFS, BFS, Union Find, Matrix
295	Find Median From Data Stream				Two Pointers, Design, Sorting, Priority Queue, Data Stream
297	Serialize And Deserialize Binary Tree				String, Tree, Dfs, Bfs, Design, Binary Tree
692	Top K Frequent Words				Hash Table, String, Trie, Sorting, Priority Queue, Bucket Sort, Counting
763	Partition Labels				Hash Table, Two Pointers, String, Greedy
819	Most Common Word				Hash Table, String
937	Reorder Data in Log Files				Array, String, Sorting
973	K Closest Points to Origin				Array, Math, Divide And Conquer, Geometry, Sorting, Priority Queue, Quick Select
994	Rotting Oranges				Array, BFS, Matrix
1192	Critical Connections in a Network				DFS, Graph, Biconnected Components