added 0004
Merge pull request #29 from renzongxian/master

Add my solution to 0023.
Merge pull request #28 from ailurus1991/solving

added 0004
added 0005 and 0006
Merge pull request #30 from ailurus1991/solving

added 0005 and 0006
10
10
Merge pull request #31 from ailurus1991/solving

Solving
Merge pull request #6 from Show-Me-the-Code/master

update from the Show-Me-the-Code