Can anyone explain me text justification algorithm?

[E3h7X9L8]

I'm trying to make a good text justification algorithm but I can't get it right.
I'm looking for explaination on dynamic programming text justification algorithm.

[LB]

This is not a trivial thing to do. Even today, text justification is a complicated subject and generally even the best code needs a good processor.

See here for more information:
https://www.youtube.com/watch?v=kzdugwr4Fgk