m artists sit in a circle and each arriving buyer goes to artist i % m, or to the next free artist to the right, or leaves if all are busy. Find the artist who served the most buyers.

m sketch artists sit in a circle. Buyer i arrives at time T[i] needing D[i] time and is assigned to artist i % m if free, otherwise to the first free artist to the right (wrapping around); if all are busy the buyer leaves. Given m, sorted arrival times and durations, find the artist who served the most buyers.