Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
* 时间O(n) 空间O(n)（理论最优，无冗余计算/存储）
，详情可参考Line官方版本下载
Immediately after boot, we can see that anaconda starts without asking us any questions.
老街改造，会请老住户来讲古；社区里的公共设施，居民共同参与改进完善；乡村发展旅游，不少能人归乡，举着手机介绍自家山水……谁也不是旁观者，都成了美好生活的“绣工”。