add chapter 30~31
Update 30.0~31.0.md
Update 30.0~31.0.md
Update 30.0~31.0.md
Update preface.md
Merge remote-tracking branch 'upstream/master'
update
Update preface.md
update
update
remove preface.md.bak
Delete .directory
update
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Add c version
Add the chapter02
Update 01.0.md

review
Fix bug in bit hack, and I think the #84 pull request is not good
Add chapter03 heap sort max/min k number