Problem statement: route ● Route of worker:Sw=(ow,W…ls-1 o Rw: the set of requests served by w lw: either origin or destination ofrE Rw O D(Sw): distance of the routeProblem Statement: Route ⚫ Route of worker： S𝑤 = 𝑜𝑤, 𝑙𝑤 1 , ⋯ , 𝑙𝑤 𝑆𝑤 −1 ⚫ 𝑅𝑤: the set of requests served by 𝑤 ⚫ 𝑙𝑤 𝑖 : either origin or destination of 𝑟 ∈ 𝑅𝑤 ⚫ 𝐷 𝑆𝑤 : distance of the route 13