Just for testing
Still testing....
The answer of first question.
The answer of second question.
The answer of fifth question.
Fix the answer of first question.
Fix first and second question.
Start reading Open Data Structure...
 The answer of 1.1, 1.
The answer of Exercise 1.4.
 The answer of Exercise 1.1 2.
The answer of Exercise 1.1 3.
 The answers of Exercise 1.1 4 and 5.
The answer of Exercise 1.1 6,7,8
The answer of Exercise 1.1, 9
Merge pull request #9 from JohnneyMing/zhongm2

Zhongm2