对方先介绍（自己是hiring manager)和小组情况。然后问
1. 有多少年 C++ 编程经验，最近在做什么
2. What is copy constructor? why you need it? In which case will it be used:
pass by value or pass by reference?
3. what is C++ exception handling? what is throwed? In what scenarios you
may throw exception again? (这个没答上）
4. virtual function? how is it implemented? can destructor virtual?
5. what makes a re-entrant function?
6. what is STL? why use it? have you used it before?
7. what journal or website do you often read?
有的可能忘了，没有具体算法，
