Problems

Easy

• 359. Logger Rate Limiter

Medium

• 146. LRU Cache
• 211. Design Add and Search Words Data Structure
• 251. Flatten 2D Vector
• 284. Peeking Iterator
• 288. Unique Word Abbreviation
• 348. Design Tic-Tac-Toe
• 353. Design Snake Game
• 355. Design Twitter
• 362. Design Hit Counter
• 379. Design Phone Directory
• 535. Encode and Decode TinyURL
• 1396. Design Underground System
• 1797. Design Authentication Manager
• 1845. Seat Reservation Manager

Hard

• 295. Find Median from Data Stream