init assignment0
change i/o files' format to .txt
Merge pull request #93 from f0rward/assignment0

13307130195_CHENSHAOXIANG_assignment0
just ignore a.out
submit assignment0
代码不放那么紧密
删无用代码
Merge pull request #94 from f0rward/assignment0

13307130195_CHENSHAOXIANG_assignment0
Merge branch 'master' of https://github.com/ds-sww/codebase into assignment1
commit assignment1