How does SO realize the diff program？
Just as this url shown:
http://stackoverflow.com/posts/6911349/revisions

Who can explain the algorithm of that? I'm interested in it.Thanks a lot!


  [1]: http://i.stack.imgur.com/7IId9.png
How does SO realize the diff program？
===

Just as this url shown:
http://stackoverflow.com/posts/6911349/revisions

Who can explain the algorithm of that? I'm interested in it.Thanks a lot!


  [1]: http://i.stack.imgur.com/7IId9.png