研学旅行租车方案：121 名师生如何安排大巴和中巴？

Translation: The school plans to organize a one-day field trip for 121 teachers and students. They need to rent a total of 'm' buses, including large buses and medium-sized buses. The requirement is that the rented vehicles should not have any empty seats or be overloaded. Each large bus can accommodate 33 passengers, while each medium-sized bus can accommodate 22 passengers.