Design

L134 LRU (146)

460 LFU (L24)

355 Design Twitter (L501 Mini Twitter)

L526 Load Balancer (simpler version of 380)

380 Insert Delete GetRandom O 1

381 Insert Delete GetRandom O 1 Duplicates allowed

535 Encode and Decode TinyURL

L234 Webpage Crawler

L231 Typeahead

L555 Counting Bloom Filter

L556 Standard Bloom filter

432 All O one Data Structure

L215 Rate Limiter

359 Logger Rate Limiter

362 Design Hit Counter

348 Design Tic-Tac-Toe

L529 GeoHash

L530 Geohash II

794 Valid Tic-Tac-Toe state

基本数据结构设计：

707 Design Linked List

622 Design Circular Queue