Improve layout
Merge branch 'master' of github.com:ace-your-place/festival-of-code
Merge branch 'master' of http://github.com/ace-your-place/festival-of-code
Merge branch 'master' of http://github.com/ace-your-place/festival-of-code
Merge branch 'master' of http://github.com/ace-your-place/festival-of-code
Essential algorithm