Question 1:
Solution:
Question 2:
Question 3:
Other questons:
<1> Chapter 2: 3, 4, 8
<2> Chapter 2: Sections 2.1, 2.2, 2.4
ALG 2-n: Practice
原文：https://www.cnblogs.com/JasperZhao/p/13972329.html
