Six drivers, fair shares, no door twice

Yi-ting runs a small family delivery company in Taipei, with six drivers and orders from three online shops. Every morning she prints the orders and splits them by hand. The same customer often orders from two shops, so two drivers climb to the same flat. Some drivers get all the far stops in Neihu, others finish by noon, and arguments start before nine. With xMap Flows, Yi-ting built Swift. Every morning at seven, Swift takes the day's orders from all three shops, keeps one stop for each address, splits the city into six fair areas, one for each driver, plans each driver's route in the best order, and puts every route in the drivers' shared sheet. This morning there are one hundred and forty orders. Swift finds eighteen going to a door already on the list, so the drivers make one hundred and twenty two stops, about twenty each. Everyone finishes by four, and nobody argues. Yi-ting used to referee her drivers. Now she just waves them off.

The story in words