Scalable Web Architecture and Distributed Systems
146. LRU Chace
208. Implement Trie (Prefix Tree)
588. Design In-memory File System
706. Design HashMap
79. Word Search
200. Number of Islands
289. Game of Life
694. Number of Distinct Island
198. House Robber
213. House Robber II
337. House Robber III
23. Merge K Sorted Lists
230. Kth Smallest Element in a BST
692. Top K Frequent Words
138. Copy List with Random Pointer
5. Longest Palindromic Substring
819. Most Common Word
116. Populating next right pointers in each node
222. Count Complete Tree Nodes
545. Boundary of Binary Tree
572. Subtree of Another Tree