[shimon]

I don't think those algorithms are applicable here, because it's normal (even good) for investors to invest in multiple companies.

https://en.wikipedia.org/wiki/Stable_marriage_problem

The logical optimization target for YC is the total valuation of their companies, which probably means whatever approach creates the most competition among investors.

Edit: more active discussion on this topic at https://news.ycombinator.com/item?id=12051218