Algorithm to divide text into 3 evenly-sized groups

Question

I\'m would like to create an algorithm that will divide text into 3-evenly sized groups (based on text length). Since this will be put to use for line-breaks, the order of

Answer 1

You can try the next simple heuristic for starters: Place to iterators in n/3 and 2n/3 and search for the closest space near each of them.