Here's some related functionality I need: A group of people engage in N rounds of betting, where there is one winner per round. Each round winner is entitled

Here's some related functionality I need: A group of people engage in N rounds of betting, where there is one winner per round. Each round winner is entitled to $X from all other participants for that round. Find simplest (ie fewest number of) settle-up payments at the conclusion of the N rounds. It's always harder to figure this out in real-time than it seems like it should be. Mobile app ftw.