1. AI 
 "Why AI is important to Google?"
"Which industry would AI have most potential".
"Help first-time Airbnb hosts set the listing price?" 
2. Stream数字最近值 
 Given a data stream and a distance d, output three values that within distance d ,if less
than three values,return None
For example:
d=10
input 1 -> None
input 2-> None
input 20 -> None
input 50-> None
input 5->[1,2,5]
input 4-> None
than three values,return None
For example:
d=10
input 1 -> None
input 2-> None
input 20 -> None
input 50-> None
input 5->[1,2,5]
input 4-> None
3. 无人机 
 如何确保无人机识别到正确的后院并且投放。
4. 字典比较 
 两个dictionary,每个dictionary都是key 然后套一个或多个dictionary。要求找到两个dictionary相同的key 和独立的key(要把所有的dictionary展开到最里层去比较)
5. 项目介绍 
 介绍一个自己的统计或者机器学习项目。由浅入深,假设听众没有技术背景,简单介绍。