Merge pull request #2 from ds-sww/master

...
size,isEmpty,get,add,remove
fix bugs of remove()
first homework
first commit
修改了文件目录
抽象出了checkSize方法
发现remove忘记返回值了...
assignment1 2
assignment 1
First version of assignment3
13307130316_Liminjun_assignment3
bug fixed
commit by 13307130309
initial commit
Initial Commit
assignment1
Merge pull request #1 from ds-sww/master

ass3
Initial Commit
assignment3[initial]